JAJSJG4B
August 2020 – May 2024
LP8864S-Q1
PRODUCTION DATA
1
1
特長
2
アプリケーション
3
概要
4
Pin Configuration and Functions
5
Specifications
5.1
Absolute Maximum Ratings
5.2
ESD Ratings
5.3
Recommended Operating Conditions
5.4
Thermal Information
5.5
Electrical Characteristics
5.6
Logic Interface Characteristics
5.7
Timing Requirements for I2C Interface
14
5.8
Typical Characteristics
6
Detailed Description
6.1
Overview
6.2
Functional Block Diagram
6.3
Feature Description
6.3.1
Control Interface
6.3.2
Function Setting
6.3.3
Device Supply (VDD)
6.3.4
Enable (EN)
6.3.5
Charge Pump
6.3.6
Boost Controller
6.3.6.1
Boost Cycle-by-Cycle Current Limit
6.3.6.2
Controller Min On/Off Time
6.3.6.3
Boost Adaptive Voltage Control
6.3.6.3.1
FB Divider Using Two-Resistor Method
6.3.6.3.2
FB Divider Using Three-Resistor Method
6.3.6.3.3
FB Divider Using External Compensation
6.3.6.4
Boost Sync and Spread Spectrum
6.3.6.5
Boost Output Discharge
6.3.6.6
Light Load Mode
6.3.7
LED Current Sinks
6.3.7.1
LED Output Current Setting
6.3.7.2
LED Output String Configuration
6.3.7.3
LED Output PWM Clock Generation
6.3.8
Brightness Control
6.3.8.1
Brightness Control Signal Path
6.3.8.2
Dimming Mode
6.3.8.3
LED Dimming Frequency
6.3.8.4
Phase-Shift PWM Mode
6.3.8.5
Hybrid Mode
6.3.8.6
Direct PWM Mode
6.3.8.7
Sloper
6.3.8.8
PWM Detector Hysteresis
6.3.8.9
Dither
6.3.9
Protection and Fault Detections
6.3.9.1
Supply Faults
6.3.9.1.1
VIN Undervoltage Faults (VINUVLO)
6.3.9.1.2
VIN Overvoltage Faults (VINOVP)
6.3.9.1.3
VDD Undervoltage Faults (VDDUVLO)
6.3.9.1.4
VIN OCP Faults (VINOCP)
6.3.9.1.4.1
VIN OCP Current Limit vs. Boost Cycle-by-Cycle Current Limit
6.3.9.1.5
Charge Pump Faults (CPCAP, CP)
6.3.9.1.6
CRC Error Faults (CRCERR)
6.3.9.2
Boost Faults
6.3.9.2.1
Boost Overvoltage Faults (BSTOVPL, BSTOVPH)
6.3.9.2.2
Boost Overcurrent Faults (BSTOCP)
6.3.9.2.3
LEDSET Resistor Missing Faults (LEDSET)
6.3.9.2.4
MODE Resistor Missing Faults (MODESEL)
6.3.9.2.5
FSET Resistor Missing Faults (FSET)
6.3.9.2.6
ISET Resistor Out of Range Faults (ISET)
6.3.9.2.7
Thermal Shutdown Faults (TSD)
6.3.9.3
LED Faults
6.3.9.3.1
Open LED Faults (OPEN_LED)
6.3.9.3.2
Short LED Faults (SHORT_LED)
6.3.9.3.3
LED Short to GND Faults (GND_LED)
6.3.9.3.4
Invalid LED String Faults (INVSTRING)
6.3.9.3.5
I2C Timeout Faults
6.3.9.4
Overview of the Fault and Protection Schemes
6.4
Device Functional Modes
6.4.1
State Diagram
6.4.2
Shutdown
6.4.3
Device Initialization
6.4.4
Standby Mode
6.4.5
Power-line FET Soft Start
6.4.6
Boost Start-Up
6.4.7
Normal Mode
6.4.8
Fault Recovery
6.4.9
Latch Fault
6.4.10
Start-Up Sequence
6.5
Programming
6.5.1
I2C-Compatible Interface
6.5.2
Programming Examples
6.5.2.1
General Configuration Registers
6.5.2.2
Clearing Fault Interrupts
6.5.2.3
Disabling Fault Interrupts
6.5.2.4
Diagnostic Registers
7
Register Maps
7.1
FullMap Registers
8
Application and Implementation
8.1
Application Information
8.2
Typical Applications
8.2.1
Full Feature Application for Display Backlight
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Inductor Selection
8.2.1.2.2
Output Capacitor Selection
8.2.1.2.3
Input Capacitor Selection
8.2.1.2.4
Charge Pump Output Capacitor
8.2.1.2.5
Charge Pump Flying Capacitor
8.2.1.2.6
Output Diode
8.2.1.2.7
Switching FET
8.2.1.2.8
Boost Sense Resistor
8.2.1.2.9
Power-Line FET
8.2.1.2.10
Input Current Sense Resistor
8.2.1.2.11
Feedback Resistor Divider
8.2.1.2.12
Critical Components for Design
8.2.1.3
Application Curves
8.2.2
Application with Basic/Minimal Operation
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.3
Application Curves
8.2.3
SEPIC Mode Application
8.2.3.1
Design Requirements
8.2.3.2
Detailed Design Procedure
8.2.3.2.1
Inductor Selection
8.2.3.2.2
Coupling Capacitor Selection
8.2.3.2.3
Output Capacitor Selection
8.2.3.2.4
Input Capacitor Selection
8.2.3.2.5
Charge Pump Output Capacitor
8.2.3.2.6
Charge Pump Flying Capacitor
8.2.3.2.7
Switching FET
8.2.3.2.8
Output Diode
8.2.3.2.9
Switching Sense Resistor
8.2.3.2.10
Power-Line FET
8.2.3.2.11
Input Current Sense Resistor
8.2.3.2.12
Feedback Resistor Divider
8.2.3.2.13
Critical Components for Design
8.2.3.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Layout Example
9
Device and Documentation Support
9.1
Device Support
9.1.1
サード・パーティ製品に関する免責事項
9.2
ドキュメントの更新通知を受け取る方法
9.3
サポート・リソース
9.4
Trademarks
9.5
静電気放電に関する注意事項
9.6
用語集
10
Revision History
11
Mechanical, Packaging, and Orderable Information
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)
RHB|32
MPQF130D
DCP|38
MPDS520B
サーマルパッド・メカニカル・データ
RHB|32
QFND589
DCP|38
PPTD170A
発注情報
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1
特長
車載アプリケーション用に AEC-Q100 認定済み:
デバイス温度グレード 1:
-40℃~+125℃、T
A
デバイス HBM ESD 分類レベル 2
デバイス CDM ESD 分類レベル C4B
入力電圧動作範囲:3V~48V
4
つの高精度電流シンク
電流シンクごとに最大
150
mA の DC 電流
電流マッチング 1% (標準値)
152Hz の LED 出力 PWM 周波数を使用した 32,000:1 の調光率
I2C または PWM 入力により、最大 16 ビットの LED 調光分解能
8 つの構成可能な LED ストリング構成
自動位相シフトの PWM 調光
12 ビットのアナログ調光
最高 48V の V
OUT
昇圧または SEPIC DC/DC コントローラ
スイッチング周波数:100kHz~2.2MHz
昇圧拡散スペクトラムによる EMI の低減
昇圧同期入力により、外部クロックから昇圧スイッチング周波数を設定
昇圧のディスエーブル時に出力電圧を自動的に放電
広範なフォルト診断