The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the
LP2981 100mA 超低ドロップアウト レギュレータ、シャットダウン付き
LP2981 100mA、低ドロップアウト レギュレータ、SOT-23 パッケージ
LP2981 100mA、低ドロップアウト レギュレータ、SOT-23 パッケージ
特長
特長
アプリケーション
アプリケーション
概要
概要
Table of Contents
Table of Contents
Pin Configuration and Functions
Pin Configuration and Functions
Specifications
Specifications
Absolute Maximum Ratings
Absolute Maximum Ratings
ESD Ratings
ESD Ratings
Recommended Operating Conditions
Recommended Operating Conditions
Thermal Information
Thermal Information
Electrical Characteristics
Electrical Characteristics
Typical Characteristics
Typical Characteristics
Detailed Description
Detailed Description
Overview
Overview
Functional Block Diagram
Functional Block Diagram
Feature Description
Feature Description
Output Enable
Output Enable
Dropout Voltage
Dropout Voltage
Current Limit
Current Limit
Undervoltage Lockout (UVLO)
Undervoltage Lockout (UVLO)
Thermal Shutdown
Thermal Shutdown
Output Pulldown
Output Pulldown
Device Functional Modes
Device Functional Modes
Device Functional Mode Comparison
Device Functional Mode Comparison
Normal Operation
Normal Operation
Dropout Operation
Dropout Operation
Disabled
Disabled
Application and Implementation
Application and Implementation
Application Information
Application Information
Recommended Capacitor Types
Recommended Capacitor Types
Recommended Capacitors for the Legacy Chip
Recommended Capacitors for the Legacy Chip
Tantalum Capacitors
Tantalum Capacitors
Ceramic Capacitors
Ceramic Capacitors
Aluminum Capacitors
Aluminum Capacitors
Recommended Capacitors for the New Chip
Recommended Capacitors for the New Chip
Input and Output Capacitor Requirements
Input and Output Capacitor Requirements
Input Capacitor
Input Capacitor
Output Capacitor
Output Capacitor
Estimating Junction Temperature
Estimating Junction Temperature
Power Dissipation (PD)
Power Dissipation (PD)
Reverse Current
Reverse Current
Typical Application
Typical Application
Design Requirements
Design Requirements
Detailed Design Procedure
Detailed Design Procedure
ON and OFF Input Operation
ON and OFF Input Operation
Application Curves
Application Curves
Power Supply Recommendations
Power Supply Recommendations
Layout
Layout
Layout Guidelines
Layout Guidelines
Layout Example
Layout Example
Device and Documentation Support
Device and Documentation Support
Device Nomenclature
Device Nomenclature
Documentation Support
Documentation Support
Related Documentation
Related Documentation
Receiving Notification of Documentation Updates
Receiving Notification of Documentation Updates
サポート・リソース
サポート・リソース
Trademarks
Trademarks
静電気放電に関する注意事項
静電気放電に関する注意事項
用語集
用語集
Revision History
Revision History
Revision History
Revision History
Mechanical, Packaging, and Orderable Information
Mechanical, Packaging, and Orderable Information
重要なお知らせと免責事項
重要なお知らせと免責事項
LP2981 100mA、低ドロップアウト レギュレータ、SOT-23 パッケージ
LP2981 100mA、低ドロップアウト レギュレータ、SOT-23 パッケージ
特長
G
「製品情報」表、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加。
yes
H
文書全体にわたって表、図、相互参照の採番方法を更新
yes
H
現在のファミリのフォーマットに合わせてドキュメント全体を変更
yes
H
ドキュメントに M3 デバイスを追加
yes
入力電圧 (VIN) 範囲：
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
出力電圧 (VOUT) 範囲：1.2 V～5.0 V
出力電圧 (VOUT) 精度：
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
負荷および温度に対する出力電圧 (VOUT) 精度：±1% (新チップ)
出力電流：最大 100mA
低い IQ (新チップ)：69μA (ILOAD = 0 mA の場合)
低い IQ (新チップ)：620μA (ILOAD = 100 mA の場合)
シャットダウン電流と温度との関係：
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
出力電流制限および過熱保護
2.2µF のセラミック・コンデンサで安定動作 (新チップ)
高 PSRR (新チップ)：
1kHz で 75dB、1MHz で 45dB
動作時接合部温度：-40℃～125℃
パッケージ：5 ピン SOT-23 (DBV)
特長
G
「製品情報」表、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加。
yes
H
文書全体にわたって表、図、相互参照の採番方法を更新
yes
H
現在のファミリのフォーマットに合わせてドキュメント全体を変更
yes
H
ドキュメントに M3 デバイスを追加
yes
G
「製品情報」表、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加。
yes
H
文書全体にわたって表、図、相互参照の採番方法を更新
yes
H
現在のファミリのフォーマットに合わせてドキュメント全体を変更
yes
H
ドキュメントに M3 デバイスを追加
yes
G
「製品情報」表、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加。
yes
G「製品情報」表、「ESD 定格」表、「機能説明」セクション、「デバイスの機能モード」セクション、「アプリケーションと実装」セクション、「電源に関する推奨事項」セクション、「レイアウト」セクション、「デバイスおよびドキュメントのサポート」セクション、「メカニカル、パッケージ、および注文情報」セクションを追加。
yes
H
文書全体にわたって表、図、相互参照の採番方法を更新
yes
H文書全体にわたって表、図、相互参照の採番方法を更新yes
H
現在のファミリのフォーマットに合わせてドキュメント全体を変更
yes
H現在のファミリのフォーマットに合わせてドキュメント全体を変更yes
H
ドキュメントに M3 デバイスを追加
yes
Hドキュメントに M3 デバイスを追加yes
入力電圧 (VIN) 範囲：
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
出力電圧 (VOUT) 範囲：1.2 V～5.0 V
出力電圧 (VOUT) 精度：
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
負荷および温度に対する出力電圧 (VOUT) 精度：±1% (新チップ)
出力電流：最大 100mA
低い IQ (新チップ)：69μA (ILOAD = 0 mA の場合)
低い IQ (新チップ)：620μA (ILOAD = 100 mA の場合)
シャットダウン電流と温度との関係：
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
出力電流制限および過熱保護
2.2µF のセラミック・コンデンサで安定動作 (新チップ)
高 PSRR (新チップ)：
1kHz で 75dB、1MHz で 45dB
動作時接合部温度：-40℃～125℃
パッケージ：5 ピン SOT-23 (DBV)
入力電圧 (VIN) 範囲：
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
出力電圧 (VOUT) 範囲：1.2 V～5.0 V
出力電圧 (VOUT) 精度：
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
負荷および温度に対する出力電圧 (VOUT) 精度：±1% (新チップ)
出力電流：最大 100mA
低い IQ (新チップ)：69μA (ILOAD = 0 mA の場合)
低い IQ (新チップ)：620μA (ILOAD = 100 mA の場合)
シャットダウン電流と温度との関係：
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
出力電流制限および過熱保護
2.2µF のセラミック・コンデンサで安定動作 (新チップ)
高 PSRR (新チップ)：
1kHz で 75dB、1MHz で 45dB
動作時接合部温度：-40℃～125℃
パッケージ：5 ピン SOT-23 (DBV)
入力電圧 (VIN) 範囲：
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
出力電圧 (VOUT) 範囲：1.2 V～5.0 V
出力電圧 (VOUT) 精度：
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
負荷および温度に対する出力電圧 (VOUT) 精度：±1% (新チップ)
出力電流：最大 100mA
低い IQ (新チップ)：69μA (ILOAD = 0 mA の場合)
低い IQ (新チップ)：620μA (ILOAD = 100 mA の場合)
シャットダウン電流と温度との関係：
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
出力電流制限および過熱保護
2.2µF のセラミック・コンデンサで安定動作 (新チップ)
高 PSRR (新チップ)：
1kHz で 75dB、1MHz で 45dB
動作時接合部温度：-40℃～125℃
パッケージ：5 ピン SOT-23 (DBV)
入力電圧 (VIN) 範囲：
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
IN
従来のチップ：2.2V～16V
新しいチップ：2.5V～16V
従来のチップ：2.2V～16V新しいチップ：2.5V～16V出力電圧 (VOUT) 範囲：1.2 V～5.0 VOUT出力電圧 (VOUT) 精度：
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
OUT
±0.75% (A グレードの従来チップ)
±1.25% (標準グレードの従来チップ)
±0.5% (A グレードおよび標準グレードの新チップ)
±0.75% (A グレードの従来チップ)±1.25% (標準グレードの従来チップ)±0.5% (A グレードおよび標準グレードの新チップ)負荷および温度に対する出力電圧 (VOUT) 精度：±1% (新チップ)OUT出力電流：最大 100mA低い IQ (新チップ)：69μA (ILOAD = 0 mA の場合)QLOAD低い IQ (新チップ)：620μA (ILOAD = 100 mA の場合)QLOADシャットダウン電流と温度との関係：
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
1μA 未満 (従来チップ)
1.75μA 以下 (新チップ)
1μA 未満 (従来チップ)1.75μA 以下 (新チップ)出力電流制限および過熱保護2.2µF のセラミック・コンデンサで安定動作 (新チップ)高 PSRR (新チップ)：
1kHz で 75dB、1MHz で 45dB
1kHz で 75dB、1MHz で 45dB
1kHz で 75dB、1MHz で 45dB動作時接合部温度：-40℃～125℃パッケージ：5 ピン SOT-23 (DBV)
アプリケーション
電気メーター
マイクロ インバータ
サーバー PSU (12V 出力)
住宅用ブレーカ
単軸と多軸のサーボ ドライブ
アプリケーション
電気メーター
マイクロ インバータ
サーバー PSU (12V 出力)
住宅用ブレーカ
単軸と多軸のサーボ ドライブ
電気メーター
マイクロ インバータ
サーバー PSU (12V 出力)
住宅用ブレーカ
単軸と多軸のサーボ ドライブ
電気メーター
マイクロ インバータ
サーバー PSU (12V 出力)
住宅用ブレーカ
単軸と多軸のサーボ ドライブ
電気メーター
電気メーター
マイクロ インバータ
マイクロ インバータ
サーバー PSU (12V 出力)
サーバー PSU (12V 出力)
住宅用ブレーカ
住宅用ブレーカ
単軸と多軸のサーボ ドライブ
単軸と多軸のサーボ ドライブ
概要
LP2981 は、固定出力で低ドロップアウト (LDO) の電圧レギュレータで、2.5V～16V の入力電圧範囲に対応し (新チップのみ)、最大 100mA の負荷電流を供給できます。LP2981 は、1.2V～5.0V の出力範囲をサポートしています (新チップ)。
さらに、LP2981 (新チップ) は、負荷および温度の全範囲にわたって 1% の出力精度を備えており、低電圧マイクロコントローラ (MCU) およびプロセッサのニーズを満たすことができます。
新チップの広帯域の PSRR 特性は、1kHz で 75dB、1MHz で 45dB であり、上流の DC/DC コンバータのスイッチング周波数を減衰して、レギュレータ後のフィルタ処理を最小化できます。
内部ソフトスタート時間および電流制限保護により、スタートアップ時の突入電流が減少し、入力静電容量を最小化しました。過電流および過熱保護などの一般的な保護機能を備えています。
パッケージ情報
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
詳細については、 を参照してください。
パッケージ サイズ (長さ×幅) は公称値であり、該当する場合はピンも含まれます。
代表的なアプリケーション回路
ドロップアウト電圧と温度との関係 (新チップ)
概要
LP2981 は、固定出力で低ドロップアウト (LDO) の電圧レギュレータで、2.5V～16V の入力電圧範囲に対応し (新チップのみ)、最大 100mA の負荷電流を供給できます。LP2981 は、1.2V～5.0V の出力範囲をサポートしています (新チップ)。
さらに、LP2981 (新チップ) は、負荷および温度の全範囲にわたって 1% の出力精度を備えており、低電圧マイクロコントローラ (MCU) およびプロセッサのニーズを満たすことができます。
新チップの広帯域の PSRR 特性は、1kHz で 75dB、1MHz で 45dB であり、上流の DC/DC コンバータのスイッチング周波数を減衰して、レギュレータ後のフィルタ処理を最小化できます。
内部ソフトスタート時間および電流制限保護により、スタートアップ時の突入電流が減少し、入力静電容量を最小化しました。過電流および過熱保護などの一般的な保護機能を備えています。
パッケージ情報
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
詳細については、 を参照してください。
パッケージ サイズ (長さ×幅) は公称値であり、該当する場合はピンも含まれます。
代表的なアプリケーション回路
ドロップアウト電圧と温度との関係 (新チップ)
LP2981 は、固定出力で低ドロップアウト (LDO) の電圧レギュレータで、2.5V～16V の入力電圧範囲に対応し (新チップのみ)、最大 100mA の負荷電流を供給できます。LP2981 は、1.2V～5.0V の出力範囲をサポートしています (新チップ)。
さらに、LP2981 (新チップ) は、負荷および温度の全範囲にわたって 1% の出力精度を備えており、低電圧マイクロコントローラ (MCU) およびプロセッサのニーズを満たすことができます。
新チップの広帯域の PSRR 特性は、1kHz で 75dB、1MHz で 45dB であり、上流の DC/DC コンバータのスイッチング周波数を減衰して、レギュレータ後のフィルタ処理を最小化できます。
内部ソフトスタート時間および電流制限保護により、スタートアップ時の突入電流が減少し、入力静電容量を最小化しました。過電流および過熱保護などの一般的な保護機能を備えています。
パッケージ情報
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
詳細については、 を参照してください。
パッケージ サイズ (長さ×幅) は公称値であり、該当する場合はピンも含まれます。
LP2981 は、固定出力で低ドロップアウト (LDO) の電圧レギュレータで、2.5V～16V の入力電圧範囲に対応し (新チップのみ)、最大 100mA の負荷電流を供給できます。LP2981 は、1.2V～5.0V の出力範囲をサポートしています (新チップ)。さらに、LP2981 (新チップ) は、負荷および温度の全範囲にわたって 1% の出力精度を備えており、低電圧マイクロコントローラ (MCU) およびプロセッサのニーズを満たすことができます。新チップの広帯域の PSRR 特性は、1kHz で 75dB、1MHz で 45dB であり、上流の DC/DC コンバータのスイッチング周波数を減衰して、レギュレータ後のフィルタ処理を最小化できます。内部ソフトスタート時間および電流制限保護により、スタートアップ時の突入電流が減少し、入力静電容量を最小化しました。過電流および過熱保護などの一般的な保護機能を備えています。
パッケージ情報
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
パッケージ情報
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
部品番号
パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
パッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
部品番号パッケージ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTE
#GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/DEVINFONOTEパッケージ サイズ #GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
#GUID-E0F2B2F0-0166-4176-9938-82761AC9EFA5/LI_T3R_KTT_PZB
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981A
LP2981
SOT-23 (5)
2.90mm × 2.80mm
LP2981SOT-23 (5)2.90mm × 2.80mm
LP2981A
LP2981A
詳細については、 を参照してください。
パッケージ サイズ (長さ×幅) は公称値であり、該当する場合はピンも含まれます。
詳細については、 を参照してください。パッケージ サイズ (長さ×幅) は公称値であり、該当する場合はピンも含まれます。
代表的なアプリケーション回路
ドロップアウト電圧と温度との関係 (新チップ)
代表的なアプリケーション回路
ドロップアウト電圧と温度との関係 (新チップ)
代表的なアプリケーション回路
代表的なアプリケーション回路
ドロップアウト電圧と温度との関係 (新チップ)
ドロップアウト電圧と温度との関係 (新チップ)
Table of Contents
yes
Table of Contents
yes
yes
yes
Pin Configuration and Functions
DBV Package,
5-Pin SOT-23
(Top View)
Pin Functions
PIN
TYPE
DESCRIPTION
NO.
NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
The
nominal output capacitance must be greater than 1 μF. Throughout this document,
the nominal derating on these capacitors is 50%. Make sure that the effective
capacitance at the pin is greater than 1 μF.
Pin Configuration and Functions
DBV Package,
5-Pin SOT-23
(Top View)
Pin Functions
PIN
TYPE
DESCRIPTION
NO.
NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
The
nominal output capacitance must be greater than 1 μF. Throughout this document,
the nominal derating on these capacitors is 50%. Make sure that the effective
capacitance at the pin is greater than 1 μF.
DBV Package,
5-Pin SOT-23
(Top View)
Pin Functions
PIN
TYPE
DESCRIPTION
NO.
NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
The
nominal output capacitance must be greater than 1 μF. Throughout this document,
the nominal derating on these capacitors is 50%. Make sure that the effective
capacitance at the pin is greater than 1 μF.
DBV Package,
5-Pin SOT-23
(Top View)
DBV Package,
5-Pin SOT-23
(Top View)
DBV Package,5-Pin SOT-23(Top View)
Pin Functions
PIN
TYPE
DESCRIPTION
NO.
NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
Pin Functions
PIN
TYPE
DESCRIPTION
NO.
NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
PIN
TYPE
DESCRIPTION
NO.
NAME
PIN
TYPE
DESCRIPTION
PINTYPEDESCRIPTION
NO.
NAME
NO.NAME
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
1
IN
I
Input supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
1INIInput supply pin. Use a capacitor with a value of 1 µF or larger
from this pin to ground. See for more information.
2
GND
—
Common ground
(device substrate).
2GND—Common ground
(device substrate).
3
ON/OFF
I
Enable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.
3ON/OFF
OFFIEnable pin for the
LDO. Driving the ON/OFF pin high enables the
device. Driving this pin low disables the device. High and low
thresholds are listed in the table. Tie this pin to VIN if unused.OFFIN
4
NC
—
Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
4NC—Not internally
connected. This pin can be left open or tied to ground for improved
thermal performance.
5
OUT
O
Output of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.
5OUTOOutput of the
regulator. Use a capacitor with a value of 2.2 µF or larger from
this pin to ground#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22. See for more information.#GUID-ED9A8727-F3EA-4F22-AF2B-3231FB59812A/GUID-810D06AB-FEAA-4AFC-AF3D-594915300F22
The
nominal output capacitance must be greater than 1 μF. Throughout this document,
the nominal derating on these capacitors is 50%. Make sure that the effective
capacitance at the pin is greater than 1 μF.
The
nominal output capacitance must be greater than 1 μF. Throughout this document,
the nominal derating on these capacitors is 50%. Make sure that the effective
capacitance at the pin is greater than 1 μF.
Specifications
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
MIN
MAX
UNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.
All voltages with respect to GND.
ESD Ratings
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
JEDEC document JEP155 states that 2-kV HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 500-V CDM allows safe manufacturing with a standard ESD control process.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
All capacitor values are assumed to derate to 50% of the nominal capacitor value. Maintain an effective output capacitance of 1 µF minimum for stability.
Thermal Information
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Thermal performance results are based on the JEDEC standard of 2s2p PCB configuration. These thermal metric parameters can be further improved by 35-55% based on thermally optimized PCB layout designs. See the analysis of the
Impact of board layout on LDO thermal performance
application report.
Electrical Characteristics
specified at TJ = 25 °C, VIN = VOUT(nom) + 1.0 V or VIN = 2.5 V (whichever is greater), IOUT = 1 mA, VON/OFF = 2 V, CIN = 1.0 µF, and COUT = 2.2 µF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
Dropout voltage (VDO) is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. VDO is measured with VIN = VOUT(nom) – 100 mV for fixed output devices.
Typical Characteristics
Unless otherwise specified: TA =
25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1
µF all voltage options, ON/ OFF pin tied to VIN.
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Threshold vs Temperature (New Chip)
Specifications
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
MIN
MAX
UNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.
All voltages with respect to GND.
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
MIN
MAX
UNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.
All voltages with respect to GND.
over operating free-air temperature range (unless otherwise noted)#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
MIN
MAX
UNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
over operating free-air temperature range (unless otherwise noted)#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER1_SF1#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377649/A_3C032305_5BB2_4444_9252_7F358B2CF63C_LP298X_LP2992_300MM_AA_ABSOLUTE_MAXIMUM_RATINGS_ABSOLUTE_MAXIMUM_RATINGS_1_FOOTER2_SF1
MIN
MAX
UNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
MIN
MAX
UNIT
MIN
MAX
UNIT
MINMAXUNIT
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
Continuous input voltage range (for new chip)
–0.3
18
VOUT
Output voltage range (for legacy chip)
–0.3
9
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
ON/OFF pin voltage range (for new chip)
–0.3
18
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
Input-output voltage (for new chip)
–0.3
18
Current
Maximum output current
Internally limited
mA
Temperature
Operating junction, TJ
–55
150
°C
Storage, Tstg
–65
150
VIN
Continuous input voltage range (for legacy chip)
–0.3
16
V
VIN
IN Continuous input voltage range (for legacy chip)–0.316V
Continuous input voltage range (for new chip)
–0.3
18
Continuous input voltage range (for new chip) –0.318
VOUT
Output voltage range (for legacy chip)
–0.3
9
VOUT
OUTOutput voltage range (for legacy chip)–0.39
Output voltage range (for new chip)
–0.3
VIN + 0.3 or 9 (whichever is smaller)
Output voltage range (for new chip) –0.3VIN + 0.3 or 9 (whichever is smaller)IN
VON/OFF
ON/OFF pin voltage range (for legacy chip)
–0.3
16
VON/OFF
ON/OFF
OFFON/OFF pin voltage range (for legacy chip)OFF–0.316
ON/OFF pin voltage range (for new chip)
–0.3
18
ON/OFF pin voltage range (for new chip)OFF–0.318
VIN – VOUT
Input-output voltage (for legacy chip)
–0.3
16
VIN – VOUT
INOUTInput-output voltage (for legacy chip)–0.316
Input-output voltage (for new chip)
–0.3
18
Input-output voltage (for new chip)–0.318
Current
Maximum output current
Internally limited
mA
CurrentMaximum output currentInternally limitedmA
Temperature
Operating junction, TJ
–55
150
°C
TemperatureOperating junction, TJ
J–55150°C
Storage, Tstg
–65
150
Storage, Tstg
stg–65150
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.
All voltages with respect to GND.
Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.Absolute Maximum RatingsAbsolute Maximum RatingsRecommended Operating ConditionsRecommended Operating ConditionsAbsolute Maximum RatingsAll voltages with respect to GND.
ESD Ratings
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
JEDEC document JEP155 states that 2-kV HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 500-V CDM allows safe manufacturing with a standard ESD control process.
ESD Ratings
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
JEDEC document JEP155 states that 2-kV HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 500-V CDM allows safe manufacturing with a standard ESD control process.
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
VALUE (Legacy Chip)
VALUE (New Chip)
UNIT
VALUE (Legacy Chip)VALUE (New Chip)UNIT
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Machine model (MM)
±100
N/A
V(ESD)
Electrostatic discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
±2000
±3000
V
V(ESD)
(ESD)Electrostatic dischargeHuman body model (HBM), per ANSI/ESDA/JEDEC JS-001#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/HBM_COMM_SF2±2000±3000V
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
±500
±1000
Charged device model (CDM), per JEDEC specification JESD22-C101#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377653/CDM_COMM_SF2±500±1000
Machine model (MM)
±100
N/A
Machine model (MM)±100N/A
JEDEC document JEP155 states that 2-kV HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 500-V CDM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP155 states that 2-kV HBM allows safe manufacturing with a standard ESD control process.JEDEC document JEP157 states that 500-V CDM allows safe manufacturing with a standard ESD control process.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
All capacitor values are assumed to derate to 50% of the nominal capacitor value. Maintain an effective output capacitance of 1 µF minimum for stability.
Recommended Operating Conditions
MIN
NOM
MAX
UNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
All capacitor values are assumed to derate to 50% of the nominal capacitor value. Maintain an effective output capacitance of 1 µF minimum for stability.
MIN
NOM
MAX
UNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
MIN
NOM
MAX
UNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
MIN
NOM
MAX
UNIT
MIN
NOM
MAX
UNIT
MINNOMMAXUNIT
VIN
Supply input voltage (for legacy chip)
2.2
16
V
Supply input voltage (for new chip)
2.5
16
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
Input-output differential (for new chip)
0
16
VOUT
Output voltage (for new chip)
1.2
5
VON/OFF
Enable voltage (for legacy chip)
0
VIN
Enable voltage (for new chip)
0
16
IOUT
Output current
0
100
mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
TJ
Operating junction temperature
–40
125
°C
VIN
Supply input voltage (for legacy chip)
2.2
16
V
VIN
INSupply input voltage (for legacy chip)2.216V
Supply input voltage (for new chip)
2.5
16
Supply input voltage (for new chip)2.516
VIN – VOUT
Input-output differential (for legacy chip)
0.7
11
VIN – VOUT
INOUTInput-output differential (for legacy chip)0.711
Input-output differential (for new chip)
0
16
Input-output differential (for new chip)016
VOUT
Output voltage (for new chip)
1.2
5
VOUT
OUTOutput voltage (for new chip)1.25
VON/OFF
Enable voltage (for legacy chip)
0
VIN
VON/OFF
ON/OFF
OFFEnable voltage (for legacy chip)0VIN
IN
Enable voltage (for new chip)
0
16
Enable voltage (for new chip)016
IOUT
Output current
0
100
mA
IOUT
OUTOutput current0100mA
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
Input capacitor
1
µF
CIN
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
IN#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1Input capacitor1µF
COUT
Output capacitor (for legacy chip)
2.2
4.7
COUT
OUTOutput capacitor (for legacy chip) 2.24.7
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
1
2.2
200
Output capacitance (for new chip) #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378362/A_1A02712A_5439_4519_B668_3AF373CCFC83_LP298X_LP2992_300MM_AA_RECOMMENDED_OPERATING_CONDITIONS_RECOMMENDED_OPERATING_CONDI_1_FOOTER1_SF112.2200
TJ
Operating junction temperature
–40
125
°C
TJ
JOperating junction temperature–40125°C
All capacitor values are assumed to derate to 50% of the nominal capacitor value. Maintain an effective output capacitance of 1 µF minimum for stability.
All capacitor values are assumed to derate to 50% of the nominal capacitor value. Maintain an effective output capacitance of 1 µF minimum for stability.
Thermal Information
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Thermal performance results are based on the JEDEC standard of 2s2p PCB configuration. These thermal metric parameters can be further improved by 35-55% based on thermally optimized PCB layout designs. See the analysis of the
Impact of board layout on LDO thermal performance
application report.
Thermal Information
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Thermal performance results are based on the JEDEC standard of 2s2p PCB configuration. These thermal metric parameters can be further improved by 35-55% based on thermally optimized PCB layout designs. See the analysis of the
Impact of board layout on LDO thermal performance
application report.
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
DBV (SOT23-5)
DBV (SOT23-5)
5 PINS
5 PINS
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
UNIT
THERMAL METRIC #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/APPNOTE_LP2985_SF1Legacy Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1New Chip #GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000377647/THERMALFOOTER_SF1_SF1UNIT
DBV (SOT23-5)
DBV (SOT23-5)
DBV (SOT23-5)DBV (SOT23-5)
5 PINS
5 PINS
5 PINS5 PINS
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
RθJA
Junction-to-ambient thermal resistance
205.2
178.6
°C/W
RθJA
θJAJunction-to-ambient thermal resistance205.2178.6°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
11.83
77.9
°C/W
RθJC(top)
θJC(top)Junction-to-case (top) thermal resistance11.8377.9°C/W
RθJB
Junction-to-board thermal resistance
37.7
47.2
°C/W
RθJB
θJBJunction-to-board thermal resistance37.747.2°C/W
ψJT
Junction-to-top characterization parameter
12.2
15.9
°C/W
ψJT
JTJunction-to-top characterization parameter12.215.9°C/W
ψJB
Junction-to-board characterization parameter
33.8
46.9
°C/W
ψJB
JBJunction-to-board characterization parameter33.846.9°C/W
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Thermal performance results are based on the JEDEC standard of 2s2p PCB configuration. These thermal metric parameters can be further improved by 35-55% based on thermally optimized PCB layout designs. See the analysis of the
Impact of board layout on LDO thermal performance
application report.
For more information about traditional and new thermal metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Semiconductor and IC Package Thermal Metrics
Semiconductor and IC Package Thermal MetricsThermal performance results are based on the JEDEC standard of 2s2p PCB configuration. These thermal metric parameters can be further improved by 35-55% based on thermally optimized PCB layout designs. See the analysis of the
Impact of board layout on LDO thermal performance
application report.
Impact of board layout on LDO thermal performance
Impact of board layout on LDO thermal performance
Electrical Characteristics
specified at TJ = 25 °C, VIN = VOUT(nom) + 1.0 V or VIN = 2.5 V (whichever is greater), IOUT = 1 mA, VON/OFF = 2 V, CIN = 1.0 µF, and COUT = 2.2 µF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
Dropout voltage (VDO) is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. VDO is measured with VIN = VOUT(nom) – 100 mV for fixed output devices.
Electrical Characteristics
specified at TJ = 25 °C, VIN = VOUT(nom) + 1.0 V or VIN = 2.5 V (whichever is greater), IOUT = 1 mA, VON/OFF = 2 V, CIN = 1.0 µF, and COUT = 2.2 µF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
Dropout voltage (VDO) is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. VDO is measured with VIN = VOUT(nom) – 100 mV for fixed output devices.
specified at TJ = 25 °C, VIN = VOUT(nom) + 1.0 V or VIN = 2.5 V (whichever is greater), IOUT = 1 mA, VON/OFF = 2 V, CIN = 1.0 µF, and COUT = 2.2 µF (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
specified at TJ = 25 °C, VIN = VOUT(nom) + 1.0 V or VIN = 2.5 V (whichever is greater), IOUT = 1 mA, VON/OFF = 2 V, CIN = 1.0 µF, and COUT = 2.2 µF (unless otherwise noted)JINOUT(nom)OUTON/OFFINOUT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
Legacy chip (A grade)
–0.75
0.75
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
Legacy chip (A grade)
–1.0
1.0
%
New chip
–0.5
0.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
Legacy chip (A grade)
–2.5
2.5
%
New chip
–1
1
%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
New chip
0.002
0.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
New chip
0.002
0.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
New chip
1
2.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
New chip
3
IOUT = 1 mA
Legacy chip
7
10
New chip
11.5
14
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
17
IOUT = 25 mA
Legacy chip
70
100
New chip
110
132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
New chip
167
IOUT = 100 mA
Legacy chip
200
250
New chip
160
175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
New chip
218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
New chip
69
95
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
New chip
123
IOUT = 1 mA
Legacy chip
80
110
New chip
78
110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
New chip
140
IOUT = 25 mA
Legacy chip
200
300
New chip
225
295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
New chip
345
IOUT = 100 mA
Legacy chip
600
1000
New chip
620
790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
New chip
950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
New chip
1.25
1.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
New chip
1.12
2.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
New chip
150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
New chip
0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
New chip
0.15
High = Output ON
Legacy chip
1.4
New chip
0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
New chip
1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
New chip
0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
New chip
–0.9
VON/OFF = 5 V
Legacy chip
5
New chip
0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
New chip
2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
New chip
350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
New chip
75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd-
Reset, temperature decreasing
150
∆VOUT
Output voltage tolerance
IL = 1 mA
Legacy chip (Standard grade)
–1.25
1.25
%
∆VOUT
OUTOutput voltage toleranceIL = 1 mALLegacy chip (Standard grade)–1.251.25%
Legacy chip (A grade)
–0.75
0.75
%
Legacy chip (A grade)–0.750.75%
New chip
–0.5
0.5
%
New chip–0.50.5%
1 mA < IL < 100 mA
Legacy chip (Standard grade)
–2.0
2.0
%
1 mA < IL < 100 mALLegacy chip (Standard grade)–2.02.0%
Legacy chip (A grade)
–1.0
1.0
%
Legacy chip (A grade)–1.01.0%
New chip
–0.5
0.5
%
New chip–0.50.5%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip (Standard grade)
–3.5
3.5
%
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°CLJ Legacy chip (Standard grade)–3.53.5%
Legacy chip (A grade)
–2.5
2.5
%
Legacy chip (A grade)–2.52.5%
New chip
–1
1
%
New chip–11%
ΔVOUT(ΔVIN)
Line regulation
VO(NOM) + 1 V ≤ VIN ≤ 16 V
Legacy chip
0.007
0.014
%/V
ΔVOUT(ΔVIN)
OUT(ΔVIN)Line regulationVO(NOM) + 1 V ≤ VIN ≤ 16 VO(NOM)INLegacy chip0.0070.014%/V
New chip
0.002
0.014
New chip0.0020.014
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.007
0.032
VO(NOM) + 1 V ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°CO(NOM)INJLegacy chip0.0070.032
New chip
0.002
0.032
New chip0.0020.032
ΔVOUT(ΔILOAD)
Load regulation
1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 V
New chip
0.1
0.5
%/A
ΔVOUT(ΔILOAD)
OUT(ΔILOAD)Load regulation1 mA < IL < 100 mA, –40°C ≤ TJ ≤ 125°C, VIN = VO(NOM)+0.5 VLJ INO(NOM)New chip0.10.5%/A
VIN - VOUT
Dropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
IOUT = 0 mA
Legacy chip
1
3
mV
VIN - VOUT
INOUTDropout voltage#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1
#GUID-XXXXXXXX-SF0T-XXXX-XXXX-000000378396/A_ADB32FDA_4B69_4620_B527_3EA69A0F23FF_LP298X_LP2981_300MM_AA_ELECTRICAL_CHARACTERISTICS_ELECTRICAL_CHAR_LP2981_FOOTER1_SF1IOUT = 0 mAOUTLegacy chip13mV
New chip
1
2.75
New chip12.75
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
5
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip5
New chip
3
New chip3
IOUT = 1 mA
Legacy chip
7
10
IOUT = 1 mAOUTLegacy chip710
New chip
11.5
14
New chip11.514
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip15
New chip
17
New chip17
IOUT = 25 mA
Legacy chip
70
100
IOUT = 25 mAOUTLegacy chip70100
New chip
110
132
New chip110132
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
150
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip150
New chip
167
New chip167
IOUT = 100 mA
Legacy chip
200
250
IOUT = 100 mAOUTLegacy chip200250
New chip
160
175
New chip160175
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
375
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip375
New chip
218
New chip218
IGND
GND pin current
IOUT = 0 mA
Legacy chip
65
95
µA
IGND
GND GND pin currentIOUT = 0 mAOUTLegacy chip6595µA
New chip
69
95
New chip6995
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
125
IOUT = 0 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip125
New chip
123
New chip123
IOUT = 1 mA
Legacy chip
80
110
IOUT = 1 mAOUTLegacy chip80110
New chip
78
110
New chip78110
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
170
IOUT = 1 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip170
New chip
140
New chip140
IOUT = 25 mA
Legacy chip
200
300
IOUT = 25 mAOUTLegacy chip200300
New chip
225
295
New chip225295
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
550
IOUT = 25 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip550
New chip
345
New chip345
IOUT = 100 mA
Legacy chip
600
1000
IOUT = 100 mAOUTLegacy chip6001000
New chip
620
790
New chip620790
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°C
Legacy chip
1700
IOUT = 100 mA, –40°C ≤ TJ ≤ 125°COUTJ Legacy chip1700
New chip
950
New chip950
VON/OFF < 0.3 V, VIN = 16 V
Legacy chip
0.01
0.8
VON/OFF < 0.3 V, VIN = 16 VON/OFFINLegacy chip0.010.8
New chip
1.25
1.75
New chip1.251.75
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°C
Legacy chip
0.05
2
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 105°CON/OFFINJ Legacy chip0.052
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°C
5
VON/OFF < 0.15 V, VIN = 16 V, –40°C ≤ TJ ≤ 125°CON/OFFINJ 5
New chip
1.12
2.75
New chip1.122.75
VUVLO+
Rising bias supply UVLO
VIN rising, –40°C ≤ TJ ≤ 125°C
New chip
2.2
2.4
V
VUVLO+
UVLO+Rising bias supply UVLOVIN rising, –40°C ≤ TJ ≤ 125°CINJ New chip2.22.4V
VUVLO-
Falling bias supply UVLO
VIN falling, –40°C ≤ TJ ≤ 125°C
1.9
VUVLO-
UVLO-Falling bias supply UVLOVIN falling, –40°C ≤ TJ ≤ 125°CINJ 1.9
VUVLO(HYST)
UVLO hysteresis
–40°C ≤ TJ ≤ 125°C
0.130
VUVLO(HYST)
UVLO(HYST)UVLO hysteresis–40°C ≤ TJ ≤ 125°CJ 0.130
IO(SC)
Short Output Current
RL = 0 Ω (steady state)
Legacy chip
150
mA
IO(SC)
O(SC)Short Output CurrentRL = 0 Ω (steady state)LLegacy chip150mA
New chip
150
New chip150
VON/OFF
ON/OFF input voltage
Low = Output OFF
Legacy chip
0.5
V
VON/OFF
ON/OFF
OFFON/OFF input voltageOFFLow = Output OFFLegacy chip0.5V
New chip
0.72
New chip0.72
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
0.15
Low = Output OFF, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°COUTINJ Legacy chip0.15
New chip
0.15
New chip0.15
High = Output ON
Legacy chip
1.4
High = Output ONLegacy chip1.4
New chip
0.85
New chip0.85
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
1.6
High = Output ON, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°COUTINJ Legacy chip1.6
New chip
1.6
New chip1.6
ION/OFF
ON/OFF input current
VON/OFF = 0 V
Legacy chip
0.01
µA
ION/OFF
ON/OFF
OFFON/OFF input currentVON/OFF = 0 VON/OFFLegacy chip0.01µA
New chip
0.42
New chip0.42
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
–1
VON/OFF = 0 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°CON/OFFOUTINJ Legacy chip–1
New chip
–0.9
New chip–0.9
VON/OFF = 5 V
Legacy chip
5
VON/OFF = 5 VON/OFFLegacy chip5
New chip
0.011
New chip0.011
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°C
Legacy chip
15
VON/OFF = 5 V, VOUT + 1 ≤ VIN ≤ 16 V, –40°C ≤ TJ ≤ 125°CON/OFFOUTINJ Legacy chip15
New chip
2.20
New chip2.20
IO(PK)
Peak output current
VOUT ≥ VO(NOM) –5% (steady state)
Legacy chip
400
mA
IO(PK)
O(PK)Peak output currentVOUT ≥ VO(NOM) –5% (steady state)OUTO(NOM)Legacy chip400mA
New chip
350
New chip350
ΔVO/ΔVIN
Ripple Rejection
f = 1 kHz, COUT = 10 µF
Legacy chip
63
dB
ΔVO/ΔVIN
OINRipple Rejectionf = 1 kHz, COUT = 10 µFOUTLegacy chip63dB
New chip
75
New chip75
Vn
Output noise voltage
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
Legacy chip
160
µVRMS
Vn
nOutput noise voltageBandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mAOUT OUTLOADLegacy chip160µVRMS
VRMS
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mA
New chip
140
Bandwidth = 300 Hz to 50 kHz, COUT = 2.2 µF, VOUT = 3.3 V, ILOAD = 150 mAOUT OUTLOADNew chip140
Tsd+
Thermal shutdown threshold
Shutdown, temperature increasing
New chip
170
°C
Tsd+
sd+Thermal shutdown thresholdShutdown, temperature increasingNew chip170°C
Tsd-
Reset, temperature decreasing
150
Tsd-
sd-Reset, temperature decreasing150
Dropout voltage (VDO) is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. VDO is measured with VIN = VOUT(nom) – 100 mV for fixed output devices.
Dropout voltage (VDO) is defined as the input-to-output differential at which the output voltage drops 100 mV below the value measured with a 1-V differential. VDO is measured with VIN = VOUT(nom) – 100 mV for fixed output devices.DODOINOUT(nom)
Typical Characteristics
Unless otherwise specified: TA =
25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1
µF all voltage options, ON/ OFF pin tied to VIN.
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Threshold vs Temperature (New Chip)
Typical Characteristics
Unless otherwise specified: TA =
25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1
µF all voltage options, ON/ OFF pin tied to VIN.
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Threshold vs Temperature (New Chip)
Unless otherwise specified: TA =
25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1
µF all voltage options, ON/ OFF pin tied to VIN.
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Threshold vs Temperature (New Chip)
Unless otherwise specified: TA =
25°C, VIN = VO(NOM) + 1 V, COUT = 10 µF, CIN = 1
µF all voltage options, ON/ OFF pin tied to VIN.AINO(NOM)OUTINOFFIN
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Threshold vs Temperature (New Chip)
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (Legacy Chip)
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 VINOUT
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Load Current (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 VINOUT
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Load Regulation
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 VINOUT
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
Output Voltage
vs Temperature (New Chip)
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 V
VIN = 4.3 V, VOUT = 3.3 VINOUT
Output Voltage
vs VIN (New Chip)
VOUT = 3.3 V
Output Voltage
vs VIN (New Chip)IN
VOUT = 3.3 V
VOUT = 3.3 V
VOUT = 3.3 V
VOUT = 3.3 V
VOUT = 3.3 V
VOUT = 3.3 VOUT
Output Voltage
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Output Voltage
vs VIN and Temperature (New Chip)IN
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mAOUTL
Line Regulation
vs VIN and Temperature (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Regulation
vs VIN and Temperature (New Chip)IN
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mAOUTL
Dropout Voltage
(VDO) vs Temperature (New Chip)
Dropout Voltage
(VDO) vs Temperature (New Chip)DO
Dropout Voltage
(VDO) vs Load Current (New Chip)
Dropout Voltage
(VDO) vs Load Current (New Chip)DO
Ground Pin
Current (IGND) vs Temperature (New Chip)
Ground Pin
Current (IGND) vs Temperature (New Chip)GND
Ground Pin
Current (IGND) vs Load Current (New Chip)
Ground Pin
Current (IGND) vs Load Current (New Chip)GND
Input Current
vs Input Voltage (VIN) (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Input Current
vs Input Voltage (VIN) (New Chip)IN
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩOUTL
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 100 mA
VOUT = 3.3 V, IL = 100 mA
VOUT = 3.3 V, IL = 100 mA
VOUT = 3.3 V, IL = 100 mA
VOUT = 3.3 V, IL = 100 mA
VOUT = 3.3 V, IL = 100 mAOUTL
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
Line Transient
Response (New Chip)
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mA
VOUT = 3.3 V, IL = 1 mAOUTL
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
Load Transient
Response (New Chip)
VOUT = 3.3 V, COUT = 2.2 μF
VOUT = 3.3 V, COUT = 2.2 μF
VOUT = 3.3 V, COUT = 2.2 μF
VOUT = 3.3 V, COUT = 2.2 μF
VOUT = 3.3 V, COUT = 2.2 μF
VOUT = 3.3 V, COUT = 2.2 μFOUTOUT
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 6.0 V
VIN = 6.0 V
VIN = 6.0 V
VIN = 6.0 V
VIN = 6.0 V
VIN = 6.0 VIN
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
Short Circuit
Current vs Time (New Chip)
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 VIN
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Instantaneous
Short Circuit Current vs Temperature (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)
Short Circuit
Current vs Output Voltage (VOUT) (New Chip)OUT
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)
Ripple
Rejection vs Load Current (IL) and Frequency (New Chip)L
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)
Ripple
Rejection vs Output Capacitor (CL) and Frequency (New Chip)L
Output Noise
Density vs Load Current (IL) Frequency (New Chip)
Output Noise
Density vs Load Current (IL) Frequency (New Chip)L
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)
Output Noise
Density vs Output Capacitor (CL) Frequency (New Chip)L
Output Reverse
Leakage vs Temperature (New Chip)
Output Reverse
Leakage vs Temperature (New Chip)
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
Turn-on
Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩ
VOUT = 3.3 V, RL = 3.3 kΩOUTL
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
Turn-off
Waveform (New Chip)
VOUT = 5 V, RL = 5 kΩ
VOUT = 5 V, RL = 5 kΩ
VOUT = 5 V, RL = 5 kΩ
VOUT = 5 V, RL = 5 kΩ
VOUT = 5 V, RL = 5 kΩ
VOUT = 5 V, RL = 5 kΩOUTL
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 4.3 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)OFFON/ OFF
OFF
VIN = 4.3 V
VIN = 4.3 V
VIN = 4.3 V
VIN = 4.3 V
VIN = 4.3 V
VIN = 4.3 VIN
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)
VIN = 16.0 V
ON/
OFF Pin Current vs VON/ OFF
(New
Chip)OFFON/ OFF
OFF
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 V
VIN = 16.0 VIN
ON/
OFF Threshold vs Temperature (New Chip)
ON/
OFF Threshold vs Temperature (New Chip)OFF
Detailed Description
Overview
The LP2981 and LP2981A are
fixed-output, high PSRR, low-dropout regulators that offer exceptional,
cost-effective performance for both portable and non-portable applications. The
LP2981-N has an output tolerance of 1% across line, load, and temperature variation
(for the new chip) and is capable of delivering 100 mA of continuous load
current.
This device features integrated
overcurrent protection, thermal shutdown, output enable, and internal output
pulldown and has a built-in soft-start mechanism for controlled inrush current. This
device delivers excellent line and load transient performance. The operating ambient
temperature range of the device is –40°C to 125°C.
Functional Block Diagram
Feature Description
Output Enable
F
Added Output Enable section
no
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.
For the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.
Dropout Voltage
F
Added Dropout Voltage section
no
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.
For a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device.
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
Current Limit
F
Added Current Limit section
no
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.
shows a diagram of the current limit.
Current
Limit
Undervoltage Lockout (UVLO)
F
Added Undervoltage Lockout (UVLO) section
no
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
Thermal Shutdown
F
Added Thermal Shutdown section
no
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .
The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.
For reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
Output Pulldown
F
Added Output Pulldown section
no
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
Do not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
Device Functional Modes
Device Functional Mode Comparison
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Normal Operation
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
Dropout Operation
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.
When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.
Disabled
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.
Detailed Description
Overview
The LP2981 and LP2981A are
fixed-output, high PSRR, low-dropout regulators that offer exceptional,
cost-effective performance for both portable and non-portable applications. The
LP2981-N has an output tolerance of 1% across line, load, and temperature variation
(for the new chip) and is capable of delivering 100 mA of continuous load
current.
This device features integrated
overcurrent protection, thermal shutdown, output enable, and internal output
pulldown and has a built-in soft-start mechanism for controlled inrush current. This
device delivers excellent line and load transient performance. The operating ambient
temperature range of the device is –40°C to 125°C.
Overview
The LP2981 and LP2981A are
fixed-output, high PSRR, low-dropout regulators that offer exceptional,
cost-effective performance for both portable and non-portable applications. The
LP2981-N has an output tolerance of 1% across line, load, and temperature variation
(for the new chip) and is capable of delivering 100 mA of continuous load
current.
This device features integrated
overcurrent protection, thermal shutdown, output enable, and internal output
pulldown and has a built-in soft-start mechanism for controlled inrush current. This
device delivers excellent line and load transient performance. The operating ambient
temperature range of the device is –40°C to 125°C.
The LP2981 and LP2981A are
fixed-output, high PSRR, low-dropout regulators that offer exceptional,
cost-effective performance for both portable and non-portable applications. The
LP2981-N has an output tolerance of 1% across line, load, and temperature variation
(for the new chip) and is capable of delivering 100 mA of continuous load
current.
This device features integrated
overcurrent protection, thermal shutdown, output enable, and internal output
pulldown and has a built-in soft-start mechanism for controlled inrush current. This
device delivers excellent line and load transient performance. The operating ambient
temperature range of the device is –40°C to 125°C.
The LP2981 and LP2981A are
fixed-output, high PSRR, low-dropout regulators that offer exceptional,
cost-effective performance for both portable and non-portable applications. The
LP2981-N has an output tolerance of 1% across line, load, and temperature variation
(for the new chip) and is capable of delivering 100 mA of continuous load
current.This device features integrated
overcurrent protection, thermal shutdown, output enable, and internal output
pulldown and has a built-in soft-start mechanism for controlled inrush current. This
device delivers excellent line and load transient performance. The operating ambient
temperature range of the device is –40°C to 125°C.
Functional Block Diagram
Functional Block Diagram
Feature Description
Output Enable
F
Added Output Enable section
no
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.
For the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.
Dropout Voltage
F
Added Dropout Voltage section
no
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.
For a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device.
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
Current Limit
F
Added Current Limit section
no
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.
shows a diagram of the current limit.
Current
Limit
Undervoltage Lockout (UVLO)
F
Added Undervoltage Lockout (UVLO) section
no
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
Thermal Shutdown
F
Added Thermal Shutdown section
no
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .
The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.
For reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
Output Pulldown
F
Added Output Pulldown section
no
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
Do not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
Feature Description
Output Enable
F
Added Output Enable section
no
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.
For the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.
Output Enable
F
Added Output Enable section
no
F
Added Output Enable section
no
F
Added Output Enable section
no
FAdded Output Enable sectionOutput Enableno
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.
For the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.
For the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.
The ON/OFF
pin for the device is an active-high pin. The output voltage is enabled when
the voltage of the ON/OFF pin is greater than the
high-level input voltage of the ON/OFF pin and disabled
when the ON/OFF pin voltage is less than the low-level
input voltage of the ON/OFF pin. If independent control
of the output voltage is not needed, connect the ON/OFF
pin to the input of the device.OFFOFFOFFOFFOFFOFFFor the new chip, the device has
an internal pulldown circuit that activates when the device is disabled by
pulling the ON/OFF pin voltage lower than the low-level
input voltage of the ON/OFF pin to actively discharge
the output voltage.OFFOFF
Dropout Voltage
F
Added Dropout Voltage section
no
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.
For a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device.
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
Dropout Voltage
F
Added Dropout Voltage section
no
F
Added Dropout Voltage section
no
F
Added Dropout Voltage section
no
FAdded Dropout Voltage sectionDropout Voltageno
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.
For a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device.
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.
For a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device.
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
Dropout voltage (VDO)
is defined as the input voltage minus the output voltage (VIN –
VOUT) at the rated output current (IRATED),
where the pass transistor is fully on. IRATED is the maximum
IOUT listed in the table. The pass
transistor is in the ohmic or triode region of operation, and acts as a
switch. The dropout voltage indirectly specifies a minimum input voltage
greater than the nominal programmed output voltage at which the output
voltage is expected to stay in regulation. If the input voltage falls to
less than the nominal output regulation, then the output voltage falls as
well.DOINOUTRATEDRATEDOUTFor a
CMOS regulator, the dropout voltage is determined by the drain-source
on-state resistance (RDS(ON)) of the pass transistor. Therefore,
if the linear regulator operates at less than the rated current, the dropout
voltage for that current scales accordingly. The following equation
calculates the RDS(ON) of the device. DS(ON)DS(ON)
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
R
D
S
(
O
N
)
=
V
D
O
I
R
A
T
E
D
R
D
S
(
O
N
)
R
R
D
S
(
O
N
)
DS(ON)=
V
D
O
I
R
A
T
E
D
V
D
O
V
D
O
V
V
D
O
DO
I
R
A
T
E
D
I
R
A
T
E
D
I
I
R
A
T
E
D
RATED
Current Limit
F
Added Current Limit section
no
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.
shows a diagram of the current limit.
Current
Limit
Current Limit
F
Added Current Limit section
no
F
Added Current Limit section
no
F
Added Current Limit section
no
FAdded Current Limit sectionCurrent Limitno
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.
shows a diagram of the current limit.
Current
Limit
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.
shows a diagram of the current limit.
Current
Limit
The device has an internal current
limit circuit that protects the regulator during transient high-load current faults
or shorting events. The current limit is a brick-wall scheme. In a high-load current
fault, the brick-wall scheme limits the output current to the current limit
(ICL). ICL is listed in the table.CLCLThe output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the
Know Your Limits
application note.INOUTCL
Know Your Limits
Know Your Limits
shows a diagram of the current limit.
Current
Limit
Current
Limit
Undervoltage Lockout (UVLO)
F
Added Undervoltage Lockout (UVLO) section
no
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
Undervoltage Lockout (UVLO)
F
Added Undervoltage Lockout (UVLO) section
no
F
Added Undervoltage Lockout (UVLO) section
no
F
Added Undervoltage Lockout (UVLO) section
no
FAdded Undervoltage Lockout (UVLO) sectionUndervoltage Lockout (UVLO)no
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
For the new
chip, the device has an independent undervoltage lockout (UVLO) circuit that monitors the
input voltage, allowing a controlled and consistent turn on and off of the output voltage.
To prevent the device from turning off if the input drops during turn on, the UVLO has
hysteresis as specified in the
table.
Thermal Shutdown
F
Added Thermal Shutdown section
no
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .
The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.
For reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
Thermal Shutdown
F
Added Thermal Shutdown section
no
F
Added Thermal Shutdown section
no
F
Added Thermal Shutdown section
no
FAdded Thermal Shutdown sectionThermal Shutdownno
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .
The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.
For reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .
The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.
For reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
The device contains a thermal
shutdown protection circuit to disable the device when the junction
temperature (TJ) of the pass transistor rises to
TSD(shutdown) (typical). Thermal shutdown hysteresis makes
sure that the device resets (turns on) when the temperature falls to
TSD(reset) (typical). Thermal shutdown circuit
specifications are defined in .JSD(shutdown)SD(reset)The thermal time-constant of the
semiconductor die is fairly short, thus the device can cycle on and off when
thermal shutdown is reached until power dissipation is reduced. Power
dissipation during start up can be high from large VIN –
VOUT voltage drops across the device or from high inrush
currents charging large output capacitors. Under some conditions, the
thermal shutdown protection disables the device before start-up
completes.INOUTFor reliable operation, limit
the junction temperature to the maximum listed in the table. Operation
above this maximum temperature causes the device to exceed operational
specifications. Although the internal protection circuitry of the device is
designed to protect against thermal overall conditions, this circuitry is
not intended to replace proper heat sinking. Continuously running the device
into thermal shutdown or above the maximum recommended junction temperature
reduces long-term reliability.
Output Pulldown
F
Added Output Pulldown section
no
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
Do not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
Output Pulldown
F
Added Output Pulldown section
no
F
Added Output Pulldown section
no
F
Added Output Pulldown section
no
FAdded Output Pulldown sectionOutput Pulldownno
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
Do not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
Do not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
The new chip has an output
pulldown circuit. The output pulldown activates in the following
conditions:
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))
If 1.0 V < VIN < VUVLO
When the device is disabled
(VON/OFF
<
VON/OFF(LOW))ON/OFF
OFFON/OFF(LOW)OFFIf 1.0 V < VIN < VUVLO
INUVLODo not rely on the output
pulldown circuit for discharging a large amount of output capacitance after
the input supply has collapsed because reverse current can flow from the
output to the input. This reverse current flow can cause damage to the
device. See the
section for more details.
Device Functional Modes
Device Functional Mode Comparison
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Normal Operation
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
Dropout Operation
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.
When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.
Disabled
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.
Device Functional Modes
Device Functional Mode Comparison
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Device Functional Mode Comparison
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048 shows the conditions that lead to the different modes of operation. See
the table for
parameter values.#GUID-C934E2DD-9E4E-4F7E-87D4-CB1EE993DC55/X3048
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Device Functional Mode
Comparison
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
OPERATING MODE
PARAMETER
VIN
VON/OFF
IOUT
TJ
OPERATING MODE
PARAMETER
OPERATING MODEPARAMETER
VIN
VON/OFF
IOUT
TJ
VIN
INVON/OFF
ON/OFF
OFFIOUT
OUTTJ
J
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Normal operation
VIN >
VOUT(nom) + VDO and
VIN > VIN(min)
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Normal operationVIN >
VOUT(nom) + VDO and
VIN > VIN(min)
INOUT(nom)DOININ(min)VON/OFF
>
VON/OFF(HI)
ON/OFF
OFFON/OFF(HI)OFFIOUT <
IOUT(max)
OUTOUT(max)TJ <
TSD(shutdown)
JSD(shutdown)
Dropout operation
VIN(min) <
VIN < VOUT(nom) +
VDO
VON/OFF
>
VON/OFF(HI)
IOUT <
IOUT(max)
TJ <
TSD(shutdown)
Dropout operationVIN(min) <
VIN < VOUT(nom) +
VDO
IN(min)INOUT(nom)DOVON/OFF
>
VON/OFF(HI)
ON/OFF
OFFON/OFF(HI)OFFIOUT <
IOUT(max)
OUTOUT(max)TJ <
TSD(shutdown)
JSD(shutdown)
Disabled
(any true condition disables the device)
VIN <
VUVLO
VON/OFF
<
VON/OFF(LOW)
Not applicable
TJ >
TSD(shutdown)
Disabled
(any true condition disables the device)VIN <
VUVLO
INUVLOVON/OFF
<
VON/OFF(LOW)
ON/OFF
OFFON/OFF(LOW)OFFNot applicableTJ >
TSD(shutdown)
JSD(shutdown)
Normal Operation
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
Normal Operation
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
The device regulates to the
nominal output voltage when the following conditions are met:
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)
The output current is
less than the current limit (IOUT < ICL)
The device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)
The
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling threshold
The input voltage is
greater than the nominal output voltage plus the dropout voltage
(VOUT(nom) + VDO)OUT(nom)DOThe output current is
less than the current limit (IOUT < ICL)OUTCLThe device junction
temperature is less than the thermal shutdown temperature
(TJ < TSD)JSDThe
ON/OFF voltage has previously exceeded the
ON/OFF rising threshold voltage and has not
yet decreased to less than the enable falling thresholdOFFOFF
Dropout Operation
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.
When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.
Dropout Operation
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.
When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.
When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.
If the input voltage is lower
than the nominal output voltage plus the specified dropout voltage, but all
other conditions are met for normal operation, the device operates in
dropout mode. In this mode, the output voltage tracks the input voltage.
During this mode, the transient performance of the device becomes
significantly degraded because the pass transistor is in the ohmic or triode
region, and acts as a switch. Line or load transients in dropout can result
in large output-voltage deviations.When the device is in a steady
dropout state (defined as when the device is in dropout, VIN <
VOUT(NOM) + VDO, directly after being in a
normal regulation state, but not during start up), the pass
transistor is driven into the ohmic or triode region. When the input voltage
returns to a value greater than or equal to the nominal output voltage plus
the dropout voltage (VOUT(NOM) + VDO), the output
voltage can overshoot for a short period of time while the device pulls the
pass transistor back into the linear region.INOUT(NOM)DOnotOUT(NOM)DO
Disabled
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.
Disabled
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.
The output of
the device can be shutdown by forcing the voltage of the ON/OFF
pin to less than the maximum ON/OFF pin low-level input voltage
(see the table). When
disabled, the pass transistor is turned off, internal circuits are shutdown, and the
output voltage is actively discharged to ground by an internal discharge circuit
from the output to ground.OFFOFF
Application and Implementation
以下のアプリケーション情報は、TI の製品仕様に含まれるものではなく、TI ではその正確性または完全性を保証いたしません。個々の目的に対する製品の適合性については、お客様の責任で判断していただくことになります。お客様は自身の設計実装を検証しテストすることで、システムの機能を確認する必要があります。
Application Information
The LP2981 and LP2981A are linear
voltage regulators operating from 2.5 V to 16 V (for new chip) on the input and
regulates voltages between 1.2 V to 5 V with ±1% accuracy (across line, load and
temperature) and 100-mA maximum output current.
Successfully implementing an LDO in an
application depends on the application requirements. If the requirements are simply
input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to provide a solid design. If timing,
start-up, noise, power supply rejection ratio (PSRR), or any other transient
specification is required, then the design becomes more challenging.
Recommended Capacitor Types
F
Added Recommended Capacitor
Types section
no
Recommended Capacitors for the Legacy
Chip
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Recommended Capacitors for the New
Chip
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
Input and Output Capacitor Requirements
F
Added Input and Output Capacitor
Requirements section
no
Input Capacitor
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
Output Capacitor
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
Estimating Junction Temperature
F
Added Estimating Junction Temperature
section
no
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.
TJ = TT +
ψJT × PD
where:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
TJ = TB +
ψJB × PD
where:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
For detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Power Dissipation (PD)
F
Added Power Dissipation (PD)
section
no
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.
To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).
PD = (VIN – VOUT) ×
IOUT
Power dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.
For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.
The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).
TJ = TA + (RθJA ×
PD)
Thermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.
Reverse Current
F
Added Reverse Current
section
no
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.
Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Typical Application
LP2981 Typical Application
Minimum COUT value for stability (can
be increased without limit for improved stability
and transient response).
ON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
For the new chip, Pin 4 (NC) is not internally
connected.
Design Requirements
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
Detailed Design Procedure
ON and
OFF Input Operation
K
Changed layout of National Data Sheet to TI format
yes
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
Application Curves
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
Application and Implementation
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以下のアプリケーション情報は、TI の製品仕様に含まれるものではなく、TI ではその正確性または完全性を保証いたしません。個々の目的に対する製品の適合性については、お客様の責任で判断していただくことになります。お客様は自身の設計実装を検証しテストすることで、システムの機能を確認する必要があります。
以下のアプリケーション情報は、TI の製品仕様に含まれるものではなく、TI ではその正確性または完全性を保証いたしません。個々の目的に対する製品の適合性については、お客様の責任で判断していただくことになります。お客様は自身の設計実装を検証しテストすることで、システムの機能を確認する必要があります。
以下のアプリケーション情報は、TI の製品仕様に含まれるものではなく、TI ではその正確性または完全性を保証いたしません。個々の目的に対する製品の適合性については、お客様の責任で判断していただくことになります。お客様は自身の設計実装を検証しテストすることで、システムの機能を確認する必要があります。
Application Information
The LP2981 and LP2981A are linear
voltage regulators operating from 2.5 V to 16 V (for new chip) on the input and
regulates voltages between 1.2 V to 5 V with ±1% accuracy (across line, load and
temperature) and 100-mA maximum output current.
Successfully implementing an LDO in an
application depends on the application requirements. If the requirements are simply
input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to provide a solid design. If timing,
start-up, noise, power supply rejection ratio (PSRR), or any other transient
specification is required, then the design becomes more challenging.
Recommended Capacitor Types
F
Added Recommended Capacitor
Types section
no
Recommended Capacitors for the Legacy
Chip
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Recommended Capacitors for the New
Chip
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
Input and Output Capacitor Requirements
F
Added Input and Output Capacitor
Requirements section
no
Input Capacitor
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
Output Capacitor
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
Estimating Junction Temperature
F
Added Estimating Junction Temperature
section
no
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.
TJ = TT +
ψJT × PD
where:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
TJ = TB +
ψJB × PD
where:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
For detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Power Dissipation (PD)
F
Added Power Dissipation (PD)
section
no
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.
To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).
PD = (VIN – VOUT) ×
IOUT
Power dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.
For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.
The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).
TJ = TA + (RθJA ×
PD)
Thermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.
Reverse Current
F
Added Reverse Current
section
no
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.
Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Application Information
The LP2981 and LP2981A are linear
voltage regulators operating from 2.5 V to 16 V (for new chip) on the input and
regulates voltages between 1.2 V to 5 V with ±1% accuracy (across line, load and
temperature) and 100-mA maximum output current.
Successfully implementing an LDO in an
application depends on the application requirements. If the requirements are simply
input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to provide a solid design. If timing,
start-up, noise, power supply rejection ratio (PSRR), or any other transient
specification is required, then the design becomes more challenging.
The LP2981 and LP2981A are linear
voltage regulators operating from 2.5 V to 16 V (for new chip) on the input and
regulates voltages between 1.2 V to 5 V with ±1% accuracy (across line, load and
temperature) and 100-mA maximum output current.
Successfully implementing an LDO in an
application depends on the application requirements. If the requirements are simply
input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to provide a solid design. If timing,
start-up, noise, power supply rejection ratio (PSRR), or any other transient
specification is required, then the design becomes more challenging.
The LP2981 and LP2981A are linear
voltage regulators operating from 2.5 V to 16 V (for new chip) on the input and
regulates voltages between 1.2 V to 5 V with ±1% accuracy (across line, load and
temperature) and 100-mA maximum output current.Successfully implementing an LDO in an
application depends on the application requirements. If the requirements are simply
input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to provide a solid design. If timing,
start-up, noise, power supply rejection ratio (PSRR), or any other transient
specification is required, then the design becomes more challenging.
Recommended Capacitor Types
F
Added Recommended Capacitor
Types section
no
Recommended Capacitors for the Legacy
Chip
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Recommended Capacitors for the New
Chip
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
Recommended Capacitor Types
F
Added Recommended Capacitor
Types section
no
F
Added Recommended Capacitor
Types section
no
F
Added Recommended Capacitor
Types section
no
FAdded Recommended Capacitor
Types sectionRecommended Capacitor
Typesno
Recommended Capacitors for the Legacy
Chip
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Recommended Capacitors for the Legacy
Chip
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Tantalum Capacitors
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
For the legacy chip LP2981-N, tantalum
capacitors are the best choice for use at the output of the LDO. Most good quality
tantalums can be used with the LP2981-N, but check the manufacturer data sheet to
verify that the ESR is in range. At lower temperatures, as ESR increases, a
capacitor with ESR, near the upper limit for stability at room temperature can cause
instability. For very low temperature applications, output tantalum capacitors can
be used in parallel configuration to prevent the ESR from going up too high.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Ceramic Capacitors
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
For the legacy chip LP2981-N, ceramic
capacitors are not recommended for use at the output of the LDO. This recommendation
is because the ESR of a ceramic can be low enough to go below the minimum stable
value for the LP2981-N. A measured 2.2-μF ceramic capacitor is verified to have an
ESR of approximately 15 mΩ, which is low enough to cause oscillations. If a ceramic
capacitor is used on the output, a 1-Ω resistor is required to be placed in series
with the capacitor.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Aluminum Capacitors
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
For the legacy chip LP2981-N, aluminum
electrolytics are not typically used with the LDO, because of the large physical
size. These aluminum capacitors must meet the same ESR requirements over the
operating temperature range, more difficult because of the steep increase at cold
temperature. An aluminum electrolytic can exhibit an ESR increase of as much as 50x
when going from 20°C to −40°C. Also, some aluminum electrolytics are not operational
below −25°C because the electrolyte can freeze.
Recommended Capacitors for the New
Chip
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
Recommended Capacitors for the New
Chip
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.
The new chip is designed to be stable
using low equivalent series resistance (ESR) ceramic capacitors at the input and
output. Multilayer ceramic capacitors have become the industry standard for these
types of applications and are recommended, but must be used with good judgment.
Ceramic capacitors that employ X7R-, X5R-, and C0G-rated dielectric materials
provide relatively good capacitive stability across temperature, whereas using
Y5V-rated capacitors is discouraged because of large variations in capacitance.Regardless of the ceramic capacitor
type selected, the effective capacitance varies with operating voltage and
temperature. Generally, expect the effective capacitance to decrease by as much as
50%. The input and output capacitors listed in the Recommended Operating
Conditions table account for an effective capacitance of approximately 50%
of the nominal value.Recommended Operating
Conditions
Input and Output Capacitor Requirements
F
Added Input and Output Capacitor
Requirements section
no
Input Capacitor
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
Output Capacitor
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
Input and Output Capacitor Requirements
F
Added Input and Output Capacitor
Requirements section
no
F
Added Input and Output Capacitor
Requirements section
no
F
Added Input and Output Capacitor
Requirements section
no
FAdded Input and Output Capacitor
Requirements sectionInput and Output Capacitor
Requirementsno
Input Capacitor
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
Input Capacitor
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground.
For the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
For the legacy chip, an input
capacitor (CIN) ≥1 μF is required (the amount of capacitance can be
increased without limit). Any good-quality tantalum or ceramic capacitor can be
used. The capacitor must be located no more than half an inch from the input pin and
returned to a clean analog ground. INFor the new chip, although an input
capacitor is not required for stability, good analog design practice is to connect a
capacitor from IN to GND. This capacitor counteracts reactive input sources and
improves transient response, input ripple, and PSRR. Use an input capacitor if the
source impedance is more than 0.5 Ω. A higher value capacitor can be necessary if
large, fast rise-time load or line transients are anticipated or if the device is
located several inches from the input power source.
Output Capacitor
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
Output Capacitor
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).
For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
For the legacy chip, The output
capacitor must meet both the requirement for minimum amount of capacitance and
equivalent series resistance (ESR) value. Curves are provided which show the
allowable ESR range as a function of load current for various output voltages and
capacitor values (refer to , , , and ).For the new chip, Dynamic performance
of the device is improved with the use of an output capacitor. Use an output
capacitor, preferably ceramic capacitors, within the range specified in the table for stability.
Estimating Junction Temperature
F
Added Estimating Junction Temperature
section
no
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.
TJ = TT +
ψJT × PD
where:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
TJ = TB +
ψJB × PD
where:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
For detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Estimating Junction Temperature
F
Added Estimating Junction Temperature
section
no
F
Added Estimating Junction Temperature
section
no
F
Added Estimating Junction Temperature
section
no
FAdded Estimating Junction Temperature
sectionEstimating Junction Temperatureno
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.
TJ = TT +
ψJT × PD
where:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
TJ = TB +
ψJB × PD
where:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
For detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.
TJ = TT +
ψJT × PD
where:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
TJ = TB +
ψJB × PD
where:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
For detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
The JEDEC standard now
recommends the use of psi (Ψ) thermal metrics to estimate the junction
temperatures of the linear regulator when in-circuit on a typical PCB board
application. These metrics are not thermal resistance parameters and instead
offer a practical and relative way to estimate junction temperature. These
psi metrics are determined to be significantly independent of the copper
area available for heat-spreading. The table lists the
primary thermal metrics, which are the junction-to-top characterization
parameter (ψJT) and junction-to-board characterization parameter
(ψJB). These parameters provide two methods for calculating
the junction temperature (TJ), as described in the following
equations. Use the junction-to-top characterization parameter
(ψJT) with the temperature at the top-center of the device
package (TT) to calculate the junction temperature. Use the
junction-to-board characterization parameter (ψJB) with the PCB
surface temperature 1 mm from the device package (TB) to
calculate the junction temperature.JTJBJJTTJBBTJ = TT +
ψJT × PD
JTJTDwhere:
PD is the
dissipated power
TT is the
temperature at the center-top of the device package
PD is the
dissipated powerDTT is the
temperature at the center-top of the device packageTTJ = TB +
ψJB × PD
JBJBDwhere:
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edge
TB is the PCB
surface temperature measured 1 mm from the device package and centered
on the package edgeBFor detailed information on the
thermal metrics and how to use these metrics, see the
Semiconductor and IC Package Thermal Metrics
application note.
Semiconductor and IC Package Thermal Metrics
Semiconductor and IC Package Thermal Metrics
Power Dissipation (PD)
F
Added Power Dissipation (PD)
section
no
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.
To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).
PD = (VIN – VOUT) ×
IOUT
Power dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.
For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.
The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).
TJ = TA + (RθJA ×
PD)
Thermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.
Power Dissipation (PD)D
F
Added Power Dissipation (PD)
section
no
F
Added Power Dissipation (PD)
section
no
F
Added Power Dissipation (PD)
section
no
FAdded Power Dissipation (PD)
sectionPower Dissipation (PD)Dno
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.
To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).
PD = (VIN – VOUT) ×
IOUT
Power dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.
For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.
The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).
TJ = TA + (RθJA ×
PD)
Thermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.
To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).
PD = (VIN – VOUT) ×
IOUT
Power dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.
For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.
The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).
TJ = TA + (RθJA ×
PD)
Thermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.
Circuit reliability
requires consideration of the device power dissipation, location of
the circuit on the printed circuit board (PCB), and correct sizing
of the thermal plane. The PCB area around the regulator must have
few or no other heat-generating devices that cause added thermal
stress.To first-order
approximation, power dissipation in the regulator depends on the
input-to-output voltage difference and load conditions. The
following equation calculates power dissipation (PD).DPD = (VIN – VOUT) ×
IOUT
DINOUTOUTPower dissipation can
be minimized, and therefore greater efficiency can be achieved, by
correct selection of the system voltage rails. For the lowest power
dissipation use the minimum input voltage required for correct
output regulation.For devices with a thermal
pad, the primary heat conduction path for the device package is
through the thermal pad to the PCB. Solder the thermal pad to a
copper pad area under the device. This pad area must contain an
array of plated vias that conduct heat to additional copper planes
for increased heat dissipation.The maximum power
dissipation determines the maximum allowable ambient temperature
(TA) for the device. According to the following
equation, power dissipation and junction temperature are most often
related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and
the temperature of the ambient air (TA).AθJAA
TJ = TA + (RθJA ×
PD) JAθJADThermal resistance
(RθJA) is highly dependent on the heat-spreading
capability built into the particular PCB design, and therefore
varies according to the total copper area, copper weight, and
location of the planes. The junction-to-ambient thermal resistance
listed in the table is determined by the JEDEC standard PCB and
copper-spreading area, and is used as a relative measure of package
thermal performance. As mentioned in the
An empirical analysis of the impact
of board layout on LDO thermal
performance
application note, RθJA can
be improved by 35% to 55% compared to the Thermal Information
table value with the PCB board layout optimization.θJA
An empirical analysis of the impact
of board layout on LDO thermal
performance
An empirical analysis of the impact
of board layout on LDO thermal
performanceθJAThermal Information
Reverse Current
F
Added Reverse Current
section
no
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.
Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Reverse Current
F
Added Reverse Current
section
no
F
Added Reverse Current
section
no
F
Added Reverse Current
section
no
FAdded Reverse Current
sectionReverse Currentno
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.
Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.
Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Excessive
reverse current can damage this device. Reverse
current flows through the intrinsic body diode of
the pass transistor instead of the normal conducting
channel. At high magnitudes, this current flow
degrades the long-term reliability of the
device.Conditions
where reverse current can occur are outlined in this
section, all of which can exceed the absolute
maximum rating of VOUT ≤ VIN +
0.3 V.OUTIN
If the device has a large COUT and the
input supply collapses with little or no load
current
The output is biased when the input supply is not
established
The output is biased above the input supply
If the device has a large COUT and the
input supply collapses with little or no load
currentOUTThe output is biased when the input supply is not
establishedThe output is biased above the input supplyIf reverse
current flow is expected in the application, use external protection to protect the device.
Reverse current is not limited in the device, so external limiting is required if extended
reverse voltage operation is anticipated.
shows one approach for protecting the device.
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Example Circuit
for Reverse Current Protection Using a Schottky Diode
Typical Application
LP2981 Typical Application
Minimum COUT value for stability (can
be increased without limit for improved stability
and transient response).
ON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
For the new chip, Pin 4 (NC) is not internally
connected.
Design Requirements
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
Detailed Design Procedure
ON and
OFF Input Operation
K
Changed layout of National Data Sheet to TI format
yes
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
Application Curves
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
Typical Application
LP2981 Typical Application
Minimum COUT value for stability (can
be increased without limit for improved stability
and transient response).
ON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
For the new chip, Pin 4 (NC) is not internally
connected.
LP2981 Typical Application
Minimum COUT value for stability (can
be increased without limit for improved stability
and transient response).
ON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
For the new chip, Pin 4 (NC) is not internally
connected.
LP2981 Typical Application
Minimum COUT value for stability (can
be increased without limit for improved stability
and transient response).
ON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
For the new chip, Pin 4 (NC) is not internally
connected.
LP2981 Typical ApplicationMinimum COUT value for stability (can
be increased without limit for improved stability
and transient response).OUTON/
OFF must be actively terminated. Connect to VIN if shutdown feature is not used.OFFINFor the new chip, Pin 4 (NC) is not internally
connected.
Design Requirements
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
Design Requirements
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11 lists the parameters for this application.#GUID-1DDB0F44-A12A-43C5-9FC4-A010AA39E58A/T776633-11
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
PARAMETER
DESIGN REQUIREMENT
PARAMETER
DESIGN REQUIREMENT
PARAMETERDESIGN REQUIREMENT
Input voltage
12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
PSRR at 1 kHz
> 40 dB
Input voltage
12 V ±10%, provided by an external regulator
Input voltage12 V ±10%, provided by an external regulator
Output voltage
3.3 V ±1%
Output voltage3.3 V ±1%
Output current
100 mA (maximum), 1 mA (minimum)
Output current100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz
< 1 mVRMS
RMS noise, 300 Hz to 50 kHz< 1 mVRMS
RMS
PSRR at 1 kHz
> 40 dB
PSRR at 1 kHz> 40 dB
Detailed Design Procedure
ON and
OFF Input Operation
K
Changed layout of National Data Sheet to TI format
yes
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
Detailed Design Procedure
ON and
OFF Input Operation
K
Changed layout of National Data Sheet to TI format
yes
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
ON and
OFF Input OperationOFF
K
Changed layout of National Data Sheet to TI format
yes
K
Changed layout of National Data Sheet to TI format
yes
K
Changed layout of National Data Sheet to TI format
yes
KChanged layout of National Data Sheet to TI formatyes
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).
For proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).
The ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.
The LP2981/A is shut off by pulling the ON/
OFF input low, and turned on by driving
the input high. If this feature is not to be used, the ON/OFF input
must be tied to VIN to keep the regulator on at all times
(the ON/ OFF input must not be left
floating).OFFINOFFnotFor proper operation, the signal source used to
drive the ON/ OFF input must be able to swing
above and below the specified turn-on or turn-off voltage thresholds
which specify an ON or OFF state (see ).OFFOFFThe ON/ OFF signal can come
from either a totem-pole output, or an open-collector output with
pullup resistor to the LP2981 and LP2891A input voltage or another
logic supply. The high-level voltage can exceed the LP2981 and
LP2891A input voltage, but must remain within the ratings list in
for the ON/ OFF pin.OFFOFF
Application Curves
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
Application Curves
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
5-V,
3.3-μF ESR Curves (Legacy Chip)
VOUT = 5 V, COUT = 3.3
μF
VOUT = 5 V, COUT = 3.3
μF
VOUT = 5 V, COUT = 3.3
μF
VOUT = 5 V, COUT = 3.3
μF
VOUT = 5 V, COUT = 3.3
μF
VOUT = 5 V, COUT = 3.3
μFOUTOUT
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
5-V,
10-μF ESR Curves (Legacy Chip)
VOUT = 5 V, CL = 10
μF
VOUT = 5 V, CL = 10
μF
VOUT = 5 V, CL = 10
μF
VOUT = 5 V, CL = 10
μF
VOUT = 5 V, CL = 10
μF
VOUT = 5 V, CL = 10
μFOUTL
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
3.0-V, 3.3-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, COUT =
3.3 μF
VOUT = 3.0 V, COUT =
3.3 μF
VOUT = 3.0 V, COUT =
3.3 μF
VOUT = 3.0 V, COUT =
3.3 μF
VOUT = 3.0 V, COUT =
3.3 μF
VOUT = 3.0 V, COUT =
3.3 μFOUTOUT
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
3.0-V, 10-μF ESR Curves (Legacy Chip)
VOUT = 3.0 V, CL = 10
μF
VOUT = 3.0 V, CL = 10
μF
VOUT = 3.0 V, CL = 10
μF
VOUT = 3.0 V, CL = 10
μF
VOUT = 3.0 V, CL = 10
μF
VOUT = 3.0 V, CL = 10
μFOUTL
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 100
mA
VOUT = 3.3 V, IL = 100
mA
VOUT = 3.3 V, IL = 100
mA
VOUT = 3.3 V, IL = 100
mA
VOUT = 3.3 V, IL = 100
mA
VOUT = 3.3 V, IL = 100
mAOUTL
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
Line
Transient Response (New Chip)
VOUT = 3.3 V, IL = 1
mA
VOUT = 3.3 V, IL = 1
mA
VOUT = 3.3 V, IL = 1
mA
VOUT = 3.3 V, IL = 1
mA
VOUT = 3.3 V, IL = 1
mA
VOUT = 3.3 V, IL = 1
mAOUTL
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
Load
Transient Response (New Chip)
VOUT = 3.3 V, COUT =
2.2 μF
VOUT = 3.3 V, COUT =
2.2 μF
VOUT = 3.3 V, COUT =
2.2 μF
VOUT = 3.3 V, COUT =
2.2 μF
VOUT = 3.3 V, COUT =
2.2 μF
VOUT = 3.3 V, COUT =
2.2 μFOUTOUT
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
Turn-on Waveform (New Chip)
VOUT = 3.3 V, RL = 3.3
kΩ
VOUT = 3.3 V, RL = 3.3
kΩ
VOUT = 3.3 V, RL = 3.3
kΩ
VOUT = 3.3 V, RL = 3.3
kΩ
VOUT = 3.3 V, RL = 3.3
kΩ
VOUT = 3.3 V, RL = 3.3
kΩOUTL
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
Turn-off Waveform (New Chip)
VOUT = 5 V, RL = 5
kΩ
VOUT = 5 V, RL = 5
kΩ
VOUT = 5 V, RL = 5
kΩ
VOUT = 5 V, RL = 5
kΩ
VOUT = 5 V, RL = 5
kΩ
VOUT = 5 V, RL = 5
kΩOUTL
Power Supply Recommendations
The LP2981 is designed to operate
from an input voltage supply range between 2.5 V and 16 V (for the new chip).
The input voltage range provides adequate headroom for the device to have a
regulated output. This input supply must be well regulated. If the input supply
is noisy, additional input capacitors with low ESR can help improve the output
noise performance.
Power Supply Recommendations
The LP2981 is designed to operate
from an input voltage supply range between 2.5 V and 16 V (for the new chip).
The input voltage range provides adequate headroom for the device to have a
regulated output. This input supply must be well regulated. If the input supply
is noisy, additional input capacitors with low ESR can help improve the output
noise performance.
The LP2981 is designed to operate
from an input voltage supply range between 2.5 V and 16 V (for the new chip).
The input voltage range provides adequate headroom for the device to have a
regulated output. This input supply must be well regulated. If the input supply
is noisy, additional input capacitors with low ESR can help improve the output
noise performance.
The LP2981 is designed to operate
from an input voltage supply range between 2.5 V and 16 V (for the new chip).
The input voltage range provides adequate headroom for the device to have a
regulated output. This input supply must be well regulated. If the input supply
is noisy, additional input capacitors with low ESR can help improve the output
noise performance.
The LP2981 is designed to operate
from an input voltage supply range between 2.5 V and 16 V (for the new chip).
The input voltage range provides adequate headroom for the device to have a
regulated output. This input supply must be well regulated. If the input supply
is noisy, additional input capacitors with low ESR can help improve the output
noise performance.
Layout
Layout Guidelines
For best overall performance, place all circuit
components on the same side of the printed-circuit board and as near as practical to
the respective LDO pin connections. Place ground return connections to the input and
output capacitors, and to the LDO ground pin as close to each other as possible,
connected by a wide, component-side, copper surface. The use of vias and long traces
to create LDO circuit connections is strongly discouraged and negatively affects
system performance. This grounding and layout scheme minimizes inductive parasitics,
and thereby reduces load-current transients, minimizes noise, and increases circuit
stability. A ground reference plane is also recommended and is either embedded in
the PCB or located on the bottom side of the PCB opposite the components. This
reference plane serves to assure accuracy of the output voltage, shield noise, and
behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
Layout Example
Recommended Layout
Layout
Layout Guidelines
For best overall performance, place all circuit
components on the same side of the printed-circuit board and as near as practical to
the respective LDO pin connections. Place ground return connections to the input and
output capacitors, and to the LDO ground pin as close to each other as possible,
connected by a wide, component-side, copper surface. The use of vias and long traces
to create LDO circuit connections is strongly discouraged and negatively affects
system performance. This grounding and layout scheme minimizes inductive parasitics,
and thereby reduces load-current transients, minimizes noise, and increases circuit
stability. A ground reference plane is also recommended and is either embedded in
the PCB or located on the bottom side of the PCB opposite the components. This
reference plane serves to assure accuracy of the output voltage, shield noise, and
behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
Layout Guidelines
For best overall performance, place all circuit
components on the same side of the printed-circuit board and as near as practical to
the respective LDO pin connections. Place ground return connections to the input and
output capacitors, and to the LDO ground pin as close to each other as possible,
connected by a wide, component-side, copper surface. The use of vias and long traces
to create LDO circuit connections is strongly discouraged and negatively affects
system performance. This grounding and layout scheme minimizes inductive parasitics,
and thereby reduces load-current transients, minimizes noise, and increases circuit
stability. A ground reference plane is also recommended and is either embedded in
the PCB or located on the bottom side of the PCB opposite the components. This
reference plane serves to assure accuracy of the output voltage, shield noise, and
behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
For best overall performance, place all circuit
components on the same side of the printed-circuit board and as near as practical to
the respective LDO pin connections. Place ground return connections to the input and
output capacitors, and to the LDO ground pin as close to each other as possible,
connected by a wide, component-side, copper surface. The use of vias and long traces
to create LDO circuit connections is strongly discouraged and negatively affects
system performance. This grounding and layout scheme minimizes inductive parasitics,
and thereby reduces load-current transients, minimizes noise, and increases circuit
stability. A ground reference plane is also recommended and is either embedded in
the PCB or located on the bottom side of the PCB opposite the components. This
reference plane serves to assure accuracy of the output voltage, shield noise, and
behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
For best overall performance, place all circuit
components on the same side of the printed-circuit board and as near as practical to
the respective LDO pin connections. Place ground return connections to the input and
output capacitors, and to the LDO ground pin as close to each other as possible,
connected by a wide, component-side, copper surface. The use of vias and long traces
to create LDO circuit connections is strongly discouraged and negatively affects
system performance. This grounding and layout scheme minimizes inductive parasitics,
and thereby reduces load-current transients, minimizes noise, and increases circuit
stability. A ground reference plane is also recommended and is either embedded in
the PCB or located on the bottom side of the PCB opposite the components. This
reference plane serves to assure accuracy of the output voltage, shield noise, and
behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
Layout Example
Recommended Layout
Layout Example
Recommended Layout
Recommended Layout
Recommended Layout
Recommended Layout
Device and Documentation Support
Device Nomenclature
H
Added Device Nomenclature section
yes
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.
Documentation Support
Related Documentation
H
Added three references to Related Documentation
yes
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
サポート・リソース
テキサス・インスツルメンツ E2E サポート・フォーラムは、エンジニアが検証済みの回答と設計に関するヒントをエキスパートから迅速かつ直接得ることができる場所です。既存の回答を検索したり、独自の質問をしたりすることで、設計で必要な支援を迅速に得ることができます。
リンクされているコンテンツは、各寄稿者により「現状のまま」提供されるものです。これらはテキサス・インスツルメンツの仕様を構成するものではなく、必ずしもテキサス・インスツルメンツの見解を反映したものではありません。テキサス・インスツルメンツの使用条件を参照してください。
Trademarks
静電気放電に関する注意事項
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
用語集
テキサス・インスツルメンツ用語集
この用語集には、用語や略語の一覧および定義が記載されています。
Device and Documentation Support
Device Nomenclature
H
Added Device Nomenclature section
yes
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.
Device Nomenclature
H
Added Device Nomenclature section
yes
H
Added Device Nomenclature section
yes
H
Added Device Nomenclature section
yes
HAdded Device Nomenclature sectionDevice Nomenclatureyes
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
Available Options
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
VOUT
PRODUCT#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161
#GUID-84D0D562-4187-45B7-A349-BA3E92AAD93A/NSBVS047_111620041119161VOUT
OUT
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
LP2981c-xxyyyz
Legacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.
LP2981c-xxyyyz
Legacy chip
cxxyyyzLegacy chip
c is for the accuracy of LDO output.
xx is the nominal output voltage (for example, 33
= 3.3 V; 50 = 5.0 V).
yyy is the package
designator.
z is the package quantity. R is
for large quantity reel, T is for small quantity reel.cxxyyyz
LP2981c-xxyyyzM3
New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.
LP2981c-xxyyyzM3
New chip
cxxyyyzM3
M3New chip
c is for
the accuracy of LDO output.
xx is the nominal
output voltage (for example, 33 = 3.3 V; 50 = 5.0 V).
yyy is the package designator.
z is
the package quantity. R is for large quantity reel, T is for small quantity reel.
M3 is a suffix designator for newer chip
redesigns, fabricated on the latest TI process technology.cxxyyyzM3
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.
For the most current package and ordering information, see
the Package Option Addendum at the end of this document, or visit the device product
folder at www.ti.com.www.ti.com
Documentation Support
Related Documentation
H
Added three references to Related Documentation
yes
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
Documentation Support
Related Documentation
H
Added three references to Related Documentation
yes
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
Related Documentation
H
Added three references to Related Documentation
yes
H
Added three references to Related Documentation
yes
H
Added three references to Related Documentation
yes
HAdded three references to Related Documentation
Related Documentationyes
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
For related documentation see the following:
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
Texas Instruments,
LDO Noise
Demystified
, application note
Texas Instruments,
LDO PSRR
Measurement Simplified
, application note
Texas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
Texas Instruments,
LDO Noise
Demystified
, application note
LDO Noise
Demystified
LDO Noise
DemystifiedTexas Instruments,
LDO PSRR
Measurement Simplified
, application note
LDO PSRR
Measurement Simplified
LDO PSRR
Measurement SimplifiedTexas Instruments,
A Topical
Index of TI LDO Application Notes
, application note
A Topical
Index of TI LDO Application Notes
A Topical
Index of TI LDO Application Notes
Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper right corner, click on Alert me to register and receive a weekly digest of any product information that has changed. For change details, review the revision history included in any revised document.Alert me
サポート・リソース
テキサス・インスツルメンツ E2E サポート・フォーラムは、エンジニアが検証済みの回答と設計に関するヒントをエキスパートから迅速かつ直接得ることができる場所です。既存の回答を検索したり、独自の質問をしたりすることで、設計で必要な支援を迅速に得ることができます。
リンクされているコンテンツは、各寄稿者により「現状のまま」提供されるものです。これらはテキサス・インスツルメンツの仕様を構成するものではなく、必ずしもテキサス・インスツルメンツの見解を反映したものではありません。テキサス・インスツルメンツの使用条件を参照してください。
サポート・リソース
テキサス・インスツルメンツ E2E サポート・フォーラムは、エンジニアが検証済みの回答と設計に関するヒントをエキスパートから迅速かつ直接得ることができる場所です。既存の回答を検索したり、独自の質問をしたりすることで、設計で必要な支援を迅速に得ることができます。
リンクされているコンテンツは、各寄稿者により「現状のまま」提供されるものです。これらはテキサス・インスツルメンツの仕様を構成するものではなく、必ずしもテキサス・インスツルメンツの見解を反映したものではありません。テキサス・インスツルメンツの使用条件を参照してください。
テキサス・インスツルメンツ E2E サポート・フォーラムは、エンジニアが検証済みの回答と設計に関するヒントをエキスパートから迅速かつ直接得ることができる場所です。既存の回答を検索したり、独自の質問をしたりすることで、設計で必要な支援を迅速に得ることができます。
テキサス・インスツルメンツ E2E サポート・フォーラムテキサス・インスツルメンツ E2Eリンクされているコンテンツは、各寄稿者により「現状のまま」提供されるものです。これらはテキサス・インスツルメンツの仕様を構成するものではなく、必ずしもテキサス・インスツルメンツの見解を反映したものではありません。テキサス・インスツルメンツの使用条件を参照してください。使用条件
Trademarks
Trademarks
静電気放電に関する注意事項
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
静電気放電に関する注意事項
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
この IC は、ESD によって破損する可能性があります。テキサス・インスツルメンツは、IC を取り扱う際には常に適切な注意を払うことを推奨します。正しい取り扱いおよび設置手順に従わない場合、デバイスを破損するおそれがあります。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
ESD による破損は、わずかな性能低下からデバイスの完全な故障まで多岐にわたります。精密な IC の場合、パラメータがわずかに変化するだけで公表されている仕様から外れる可能性があるため、破損が発生しやすくなっています。
用語集
テキサス・インスツルメンツ用語集
この用語集には、用語や略語の一覧および定義が記載されています。
用語集
テキサス・インスツルメンツ用語集
この用語集には、用語や略語の一覧および定義が記載されています。
テキサス・インスツルメンツ用語集
この用語集には、用語や略語の一覧および定義が記載されています。
テキサス・インスツルメンツ用語集
この用語集には、用語や略語の一覧および定義が記載されています。
テキサス・インスツルメンツ用語集
テキサス・インスツルメンツ用語集この用語集には、用語や略語の一覧および定義が記載されています。
Revision History
yes
July 2016
December 2023
G
H
Revision History
yes
July 2016
December 2023
G
H
yes
July 2016
December 2023
G
H
yesJuly 2016December 2023GH
Revision History
yes
August 2008
July 2016
F
G
Revision History
yes
August 2008
July 2016
F
G
yes
August 2008
July 2016
F
G
yesAugust 2008July 2016FG
Mechanical, Packaging, and Orderable Information
The following pages include
mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to
change without notice and revision of this document. For browser-based versions
of this data sheet, refer to the left-hand navigation.
Mechanical, Packaging, and Orderable Information
The following pages include
mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to
change without notice and revision of this document. For browser-based versions
of this data sheet, refer to the left-hand navigation.
The following pages include
mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to
change without notice and revision of this document. For browser-based versions
of this data sheet, refer to the left-hand navigation.
The following pages include
mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to
change without notice and revision of this document. For browser-based versions
of this data sheet, refer to the left-hand navigation.
The following pages include
mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to
change without notice and revision of this document. For browser-based versions
of this data sheet, refer to the left-hand navigation.
重要なお知らせと免責事項
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
重要なお知らせと免責事項
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
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これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
TI は、技術データと信頼性データ (データシートを含みます)、設計リソース
(リファレンス・デザインを含みます)、アプリケーションや設計に関する各種アドバイス、Web
ツール、安全性情報、その他のリソースを、欠陥が存在する可能性のある「現状のまま」提供しており、商品性および特定目的に対する適合性の黙示保証、第三者の知的財産権の非侵害保証を含むいかなる保証も、明示的または黙示的にかかわらず拒否します。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
これらのリソースは、TI 製品を使用する設計の経験を積んだ開発者への提供を意図したものです。(1)
お客様のアプリケーションに適した TI 製品の選定、(2) お客様のアプリケーションの設計、検証、試験、(3)
お客様のアプリケーションに該当する各種規格や、その他のあらゆる安全性、セキュリティ、規制、または他の要件への確実な適合に関する責任を、お客様のみが単独で負うものとします。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
上記の各種リソースは、予告なく変更される可能性があります。これらのリソースは、リソースで説明されている TI
製品を使用するアプリケーションの開発の目的でのみ、TI
はその使用をお客様に許諾します。これらのリソースに関して、他の目的で複製することや掲載することは禁止されています。TI
や第三者の知的財産権のライセンスが付与されている訳ではありません。お客様は、これらのリソースを自身で使用した結果発生するあらゆる申し立て、損害、費用、損失、責任について、TI
およびその代理人を完全に補償するものとし、TI は一切の責任を拒否します。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。
TI の製品は、TI の販売条件、または ti.com やかかる TI
製品の関連資料などのいずれかを通じて提供する適用可能な条項の下で提供されています。TI がこれらのリソースを提供することは、適用される TI
の保証または他の保証の放棄の拡大や変更を意味するものではありません。TI の販売条件ti.com
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
お客様がいかなる追加条項または代替条項を提案した場合でも、TI はそれらに異議を唱え、拒否します。IMPORTANT NOTICE
IMPORTANT NOTICE
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
郵送先住所：Texas
Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2023,
Texas Instruments Incorporated
Copyright © 2023,
Texas Instruments Incorporated table.
The output voltage is not regulated
when the device is in current limit. When a current limit event occurs, the device
begins to heat up because of the increase in power dissipation. When the device is
in brick-wall current limit, the pass transistor dissipates power [(VIN –
VOUT) × ICL]. If thermal shutdown is triggered, the device
turns off. After the device cools down, the internal thermal shutdown circuit turns
the device back on. If the output current fault condition continues, the device
cycles between current limit and thermal shutdown. For more information on current
limits, see the Know Your Limits application note.
Figure 6-1 shows a diagram of the current limit.
Figure 6-1 Current
Limit