ZHCSTC5A
October 2023 – March 2024
LM51772
ADVANCE INFORMATION
1
1
特性
2
应用
3
说明
4
说明(续)
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
Handling Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Timing Requirements
6.7
Typical Characteristics
7
Parameter Measurement Information
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Buck-Boost Control Scheme
8.3.1.1
Buck Mode
8.3.1.2
Boost Mode
8.3.1.3
Buck-Boost Mode
8.3.2
Power Save Mode
8.3.3
Programmable Conduction Mode PCM
8.3.4
Reference System
8.3.4.1
VIO LDO and nRST-PIN
8.3.5
Supply Voltage Selection – VMAX Switch and Selection Logic
8.3.6
Enable and Undervoltage Lockout
8.3.6.1
UVLO
8.3.6.2
VDET Comparator
8.3.7
Internal VCC Regulator
8.3.7.1
VCC1 Regulator
8.3.7.2
VCC2 Regulator
8.3.8
Error Amplifier and Control
8.3.8.1
Output Voltage Regulation
8.3.8.2
Internal Output Voltage Regulation
8.3.8.3
Dynamic Voltage Scaling
8.3.9
Short Circuit - Hiccup Protection
8.3.10
Current Monitor/Limiter
8.3.10.1
Overview
8.3.10.2
Output Current Limitation
8.3.10.3
Output Current Monitor
8.3.11
Oscillator Frequency Selection
8.3.12
Frequency Synchronization
8.3.13
Output Voltage Tracking
8.3.13.1
Analog Voltage Tracking
8.3.13.2
Digital Voltage Tracking
8.3.14
Slope Compensation
8.3.15
Configurable Soft Start
8.3.16
Drive Pin
8.3.17
Dual Random Spread Spectrum – DRSS
8.3.18
Gate Driver
8.3.19
Cable Drop Compensation (CDC)
8.3.20
CFG-pin and R2D Interface
8.3.21
Advanced Monitoring Features
8.3.21.1
Overview
8.3.21.2
BUSY
8.3.21.3
OFF
8.3.21.4
VOUT
8.3.21.5
IOUT
8.3.21.6
INPUT
8.3.21.7
TEMPERATURE
8.3.21.8
CML
8.3.21.9
OTHER
8.3.21.10
ILIM_OP
8.3.21.11
nFLT/nINT Pin Output
8.3.21.12
Status Byte
8.3.22
Protection Features
8.3.22.1
Thermal Shutdown (TSD)
8.3.22.2
Over Current Protection
8.3.22.3
Output Over Voltage Protection 1 (OVP1)
8.3.22.4
Output Over Voltage Protection 2 (OVP2)
8.3.22.5
Input Voltage Protection (IVP)
8.3.22.6
Input Voltage Regulation (IVR)
8.3.22.7
Power Good
8.3.22.8
Boot-Strap Under Voltage Protection
8.3.22.9
Boot-strap Over Voltage Clamp
8.3.22.10
CRC - CHECK
8.4
Device Functional Modes
8.4.1
Overview
8.4.2
Logic State Description
8.5
Programming
8.5.1
I2C Bus Operation
8.5.2
Clock Stretching
8.5.3
Data Transfer Formats
8.5.4
Single READ from a Defined Register Address
8.5.5
Sequential READ Starting from a Defined Register Address
8.5.6
Single WRITE to a Defined Register Address
8.5.7
Sequential WRITE Starting at a Defined Register Address
9
LM51772 Registers
10
Application and Implementation
10.1
Application Information
10.2
Typical Application
10.2.1
Design Requirements
10.2.2
Detailed Design Procedure
10.2.2.1
Custom Design with WEBENCH Tools
10.2.2.2
Frequency
10.2.2.3
Feedback Divider
10.2.2.4
Inductor and Current Sense Resistor Selection
10.2.2.5
Output Capacitor
10.2.2.6
Input Capacitor
10.2.2.7
Slope Compensation
10.2.2.8
UVLO Divider
10.2.2.9
Soft-Start Capacitor
10.2.2.10
MOSFETs QH1 and QL1
10.2.2.11
MOSFETs QH2 and QL2
10.2.2.12
Loop Compensation
10.2.2.13
External Component Selection
10.2.3
Application Curves
10.3
Power Supply Recommendations
10.4
Layout
10.4.1
Layout Guidelines
10.4.1.1
Power Stage Layout
10.4.1.2
Gate Driver Layout
10.4.1.3
Controller Layout
10.4.2
Layout Example
11
Device and Documentation Support
11.1
Documentation Support
11.1.1
Related Documentation
11.2
接收文档更新通知
11.3
支持资源
11.4
Trademarks
11.5
静电放电警告
11.6
术语表
12
Revision History
13
Mechanical, Packaging, and Orderable Information
封装选项
机械数据 (封装 | 引脚)
RHA|40
MPQF135D
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcstc5a_oa
8.3.21.9
OTHER
unused