JAJSCQ0B
December 2016 – March 2018
LMR23625-Q1
PRODUCTION DATA.
1
特長
2
アプリケーション
3
概要
Device Images
概略回路図
効率と負荷との関係、VIN = 12V、PFMオプション
4
改訂履歴
5
Device Comparison
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Characteristics
7.7
Switching Characteristics
7.8
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Fixed-Frequency Peak-Current-Mode Control
8.3.2
Adjustable Output Voltage
8.3.3
EN/SYNC
8.3.4
VCC, UVLO
8.3.5
Minimum ON-Time, Minimum OFF-Time and Frequency Foldback at Dropout Conditions
8.3.6
Power Good (PGOOD)
8.3.7
Internal Compensation and CFF
8.3.8
Bootstrap Voltage (BOOT)
8.3.9
Overcurrent and Short-Circuit Protection
8.3.10
Thermal Shutdown
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Active Mode
8.4.3
CCM Mode
8.4.4
Light Load Operation (PFM Option)
8.4.5
Light Load Operation (FPWM Option)
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Design Requirements
9.2.2
Detailed Design Procedure
9.2.2.1
Custom Design With WEBENCH® Tools
9.2.2.2
Output Voltage Setpoint
9.2.2.3
Switching Frequency
9.2.2.4
Inductor Selection
9.2.2.5
Output Capacitor Selection
9.2.2.6
Feed-Forward Capacitor
9.2.2.7
Input Capacitor Selection
9.2.2.8
Bootstrap Capacitor Selection
9.2.2.9
VCC Capacitor Selection
9.2.2.10
Undervoltage Lockout Setpoint
9.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.1.1
Compact Layout for EMI Reduction
11.1.2
Ground Plane and Thermal Considerations
11.1.3
Feedback Resistors
11.2
Layout Examples
12
デバイスおよびドキュメントのサポート
12.1
デバイス・サポート
12.1.1
開発サポート
12.1.1.1
WEBENCH®ツールによるカスタム設計
12.2
ドキュメントの更新通知を受け取る方法
12.3
コミュニティ・リソース
12.4
商標
12.5
静電気放電に関する注意事項
12.6
Glossary
13
メカニカル、パッケージ、および注文情報
パッケージ・オプション
メカニカル・データ(パッケージ|ピン)
DDA|8
MPDS092F
DRR|12
MPSS085A
サーマルパッド・メカニカル・データ
DDA|8
PPTD178C
DRR|12
PPTD338C
発注情報
jajscq0b_oa
jajscq0b_pm
7.8
Typical Characteristics
Unless otherwise specified the following conditions apply: V
IN
= 12 V, f
SW
= 2100 kHz, L = 2.2 µH, C
OUT
= 47 µF, T
A
= 25°C.
f
SW
= 2100 kHz
V
OUT
= 5 V
Figure 1.
Efficiency vs Load Current
f
SW
= 1000 kHz (Sync)
V
OUT
= 5 V
Figure 3.
Efficiency vs Load Current
PFM Option
V
OUT
= 5 V
Figure 5.
Load Regulation
V
OUT
= 5 V
Figure 7.
Dropout Curve
V
IN
= 12 V
V
FB
= 1.1 V
Figure 9.
I
Q
vs Junction Temperature
Figure 11.
VIN UVLO Hysteresis vs Junction Temperature
f
SW
= 2100 kHz
V
OUT
= 3.3 V
Figure 2.
Efficiency vs Load Current
f
SW
= 1000 kHz (Sync)
V
OUT
= 3.3 V
Figure 4.
Efficiency vs Load Current
FPWM Option
V
OUT
= 5 V
Figure 6.
Load Regulation
V
OUT
= 3.3 V
Figure 8.
Dropout Curve
Figure 10.
VIN UVLO Rising Threshold vs Junction Temperature
V
IN
= 12 V
Figure 12.
HS and LS Current Limit vs Junction Temperature