ZHCSIN4B
August 2018 – June 2021
LM5146-Q1
PRODUCTION DATA
1
特性
2
应用
3
说明
4
Revision History
5
说明(续)
6
Pin Configuration and Functions
6.1
Wettable Flanks
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
Switching Characteristics
7.7
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Input Range (VIN)
8.3.2
Output Voltage Setpoint and Accuracy (FB)
8.3.3
High-Voltage Bias Supply Regulator (VCC)
8.3.4
Precision Enable (EN/UVLO)
8.3.5
Power Good Monitor (PGOOD)
8.3.6
Switching Frequency (RT, SYNCIN)
8.3.6.1
Frequency Adjust
8.3.6.2
Clock Synchronization
8.3.7
Configurable Soft Start (SS/TRK)
8.3.7.1
Tracking
8.3.8
Voltage-Mode Control (COMP)
8.3.9
Gate Drivers (LO, HO)
8.3.10
Current Sensing and Overcurrent Protection (ILIM)
8.3.11
OCP Duty Cycle Limiter
8.4
Device Functional Modes
8.4.1
Shutdown Mode
8.4.2
Standby Mode
8.4.3
Active Mode
8.4.4
Diode Emulation Mode
8.4.5
Thermal Shutdown
9
Application and Implementation
9.1
Application Information
9.1.1
Design and Implementation
9.1.2
Power Train Components
9.1.2.1
Inductor
9.1.2.2
Output Capacitors
9.1.2.3
Input Capacitors
9.1.2.4
Power MOSFETs
9.1.3
Control Loop Compensation
9.1.4
EMI Filter Design
9.2
Typical Applications
9.2.1
Design 1 – 12-A High-Efficiency Synchronous Buck DC/DC Regulator for Automotive Applications
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.3
Custom Design With WEBENCH® Tools
9.2.1.4
Custom Design With Excel Quickstart Tool
9.2.1.5
Application Curves
9.2.2
Design 2 – High Density, 12-V, 8-A Rail From 48-V Automotive Battery Power
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
10
Power Supply Recommendations
11
Layout
11.1
Layout Guidelines
11.1.1
Power Stage Layout
11.1.2
Gate Drive Layout
11.1.3
PWM Controller Layout
11.1.4
Thermal Design and Layout
11.1.5
Ground Plane Design
11.2
Layout Example
12
Device and Documentation Support
12.1
Device Support
12.1.1
第三方产品免责声明
12.1.2
Development Support
12.1.2.1
Custom Design With WEBENCH® Tools
12.2
Documentation Support
12.2.1
Related Documentation
12.2.1.1
PCB Layout Resources
12.2.1.2
Thermal Design Resources
12.3
接收文档更新通知
12.4
支持资源
12.5
Trademarks
12.6
Electrostatic Discharge Caution
12.7
Glossary
13
Mechanical, Packaging, and Orderable Information
1
特性
符合面向汽车应用的 AEC-Q100 标准:
器件温度等级 1:–40°C 至 +125°C 的环境温度范围
提供功能安全型
可帮助进行功能安全系统设计的文档
多功能同步降压直流/直流控制器
5.5V 至 100V 的宽输入电压范围
150°C 最大结温
具有 ±1% 反馈精度的 0.8V 基准
可调输出电压范围为 0.8V 至 60V
40ns t
ON(min)
,可实现高 V
IN
/V
OUT
比
140ns t
OFF(min)
,可实现低压降
无损 R
DS(on)
或分流电流感应
针对
CISPR 25 5 级
要求进行了优化
开关频率范围为 100kHz 至 1MHz
同步输入和同步输出功能
可选二极管仿真或 FPWM
适用于标准 V
TH
MOSFET 的 7.5V 栅极驱动器
14ns 自适应死区时间控制
2.3A 拉电流和 3.5A 灌电流能力
固有保护特性,可实现稳健设计
可调节输出电压软启动
断续模式过流保护
具有迟滞功能的输入 UVLO
VCC 和栅极驱动 UVLO 保护
精密使能输入和漏极开路 PGOOD 指示器(用于时序和控制)
具有迟滞功能的热关断保护
具有可湿性侧面的 20 引脚 VQFN 封装
使用 LM5146-Q1 并借助
WEBENCH®
Power Designer
创建定制设计方案