ZHCSMX3C
December 2020 – February 2023
LM5149-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
Active EMI Filter
7.7
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Input Voltage Range (VIN)
8.3.2
High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
8.3.3
Precision Enable (EN)
8.3.4
Power-Good Monitor (PG)
8.3.5
Switching Frequency (RT)
8.3.6
Active EMI Filter
8.3.7
Dual Random Spread Spectrum (DRSS)
8.3.8
Soft Start
8.3.9
Output Voltage Setpoint (FB)
8.3.10
Minimum Controllable On Time
8.3.11
Error Amplifier and PWM Comparator (FB, EXTCOMP)
8.3.12
Slope Compensation
8.3.13
Inductor Current Sense (ISNS+, VOUT)
8.3.13.1
Shunt Current Sensing
8.3.13.2
Inductor DCR Current Sensing
8.3.14
Hiccup Mode Current Limiting
8.3.15
High-Side and Low-Side Gate Drivers (HO, LO)
8.3.16
Output Configurations (CNFG)
8.3.17
Single-Output Dual-Phase Operation
8.4
Device Functional Modes
8.4.1
Sleep Mode
8.4.2
Pulse Frequency Modulation and Synchronization (PFM/SYNC)
8.4.3
Thermal Shutdown
9
Application and Implementation
9.1
Application Information
9.1.1
Power Train Components
9.1.1.1
Buck Inductor
9.1.1.2
Output Capacitors
9.1.1.3
Input Capacitors
9.1.1.4
Power MOSFETs
9.1.1.5
EMI Filter
9.1.1.6
Active EMI Filter
9.1.2
Error Amplifier and Compensation
9.2
Typical Applications
9.2.1
Design 1 – High-Efficiency 2.1-MHz Synchronous Buck Regulator
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.2.1
Custom Design With WEBENCH® Tools
9.2.1.2.2
Custom Design With Excel Quickstart Tool
9.2.1.2.3
Buck Inductor
9.2.1.2.4
Current-Sense Resistance
9.2.1.2.5
Output Capacitors
9.2.1.2.6
Input Capacitors
9.2.1.2.7
Frequency Set Resistor
9.2.1.2.8
Feedback Resistors
9.2.1.2.9
Compensation Components
9.2.1.2.10
Active EMI Components
9.2.1.3
Application Curves
9.2.2
Design 2 – High Efficiency 48-V to 12-V 400-kHz Synchronous Buck Regulator
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.3
Application Curves
9.2.3
Design 3 – High Efficiency 440-kHz Synchronous Buck Regulator
9.2.3.1
Design Requirements
9.2.3.2
Detailed Design Procedure
9.2.3.3
Application Curves
9.2.4
Design 4 – Dual-Phase 400-kHz 20-A Synchronous Buck Regulator
9.2.4.1
Design Requirements
9.2.4.2
Detailed Design Procedure
9.2.4.3
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.1.1
Power Stage Layout
9.4.1.2
Gate-Drive Layout
9.4.1.3
PWM Controller Layout
9.4.1.4
Active EMI Layout
9.4.1.5
Thermal Design and Layout
9.4.1.6
Ground Plane Design
9.4.2
Layout Example
10
Device and Documentation Support
10.1
Device Support
10.1.1
Development Support
10.1.1.1
Custom Design With WEBENCH® Tools
10.2
Documentation Support
10.2.1
Related Documentation
10.2.1.1
PCB Layout Resources
10.2.1.2
Thermal Design Resources
10.3
接收文档更新通知
10.4
支持资源
10.5
Trademarks
10.6
静电放电警告
10.7
术语表
11
Mechanical, Packaging, and Orderable Information
封装选项
机械数据 (封装 | 引脚)
RGY|24
MPQF143E
散热焊盘机械数据 (封装 | 引脚)
RGY|24
QFND668
订购信息
zhcsmx3c_oa
zhcsmx3c_pm
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 环境工作温度范围
功能安全型
可帮助进行功能安全系统设计的文档
两个集成式 EMI 缓解机制
有源 EMI 滤波器,可提高低频下的 EMI 性能
可选双随机展频 (DRSS),可增强低频和高频频带上的 EMI 降低性能
EMI 平均降低了 25dBµV
将外部差分模式输入滤波器尺寸减小了 50% 并降低了系统成本
多功能同步降压直流/直流控制器
宽输入电压范围为 3.5V 至
80V
1% 精度、固定 3.3V/5V/12V 或 0.8V 至
55V
可调输出电压
150°C 最大结温
关断模式电流:2.3µA
空载睡眠电流:9.5µA
最多
可堆叠
两个相位
开关频率范围为 100kHz 至 2.2MHz
同步输入和同步输出功能
固有保护特性,可实现稳健的设计
内部断续模式过流保护
使能和 PGOOD 功能
VCC、VDDA 和栅极驱动 UVLO 保护
具有迟滞功能的热关断保护
使用
LM5149-Q1 并借助
WEBENCH®
Power Designer
创建定制设计方案
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