ZHCSM29A
September 2023 – June 2024
LM70840-Q1
,
LM70860-Q1
,
LM70880-Q1
PRODUCTION DATA
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
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Typical Characteristics
7
Detailed Description
7.1
Overview
7.2
Functional Block Diagram
7.3
Feature Description
7.3.1
Input Voltage Range (VIN)
7.3.2
High-Voltage Bias Supply Regulator (VCC, BIAS, VDDA)
7.3.3
Enable (EN)
7.3.4
Power-Good Monitor (PG)
7.3.5
Switching Frequency (RT)
7.3.6
Dual Random Spread Spectrum (DRSS)
7.3.7
Soft Start
7.3.8
Output Voltage Setpoint (FB)
7.3.9
Minimum Controllable On-Time
7.3.10
Error Amplifier and PWM Comparator (FB, EXTCOMP)
7.3.11
Slope Compensation
7.3.12
Shunt Current Sensing
7.3.13
Hiccup Mode Current Limiting
7.3.14
Device Configuration (CONFIG)
7.3.15
Single-Output Dual-phase Operation
7.3.16
Pulse Frequency Modulation (PFM) / Synchronization
7.3.17
Thermal Shutdown (TSD)
7.4
Device Functional Modes
7.4.1
Shutdown Mode
7.4.2
Standby Mode
7.4.3
Active Mode
7.4.4
Sleep Mode
8
Application and Implementation
8.1
Application Information
8.1.1
Power Train Components
8.1.1.1
Buck Inductor
8.1.1.2
Output Capacitors
8.1.1.3
Input Capacitors
8.1.1.4
EMI Filter
8.1.2
Error Amplifier and Compensation
8.1.3
Maximum Ambient Temperature
8.1.3.1
Derating Curves
8.2
Typical Applications
8.2.1
Design 1 – High Efficiency, Wide Input, 400-kHz Synchronous Buck Regulator
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Custom Design With WEBENCH® Tools
8.2.1.2.2
Custom Design With Excel Quickstart Tool
8.2.1.2.3
Buck Inductor
8.2.1.2.4
Current-Sense Resistance
8.2.1.2.5
Output Capacitors
8.2.1.2.6
Input Capacitors
8.2.1.2.7
Frequency Set Resistor
8.2.1.2.8
Feedback Resistors
8.2.1.2.9
Compensation Components
8.2.1.3
Application Curves
8.2.2
Design 2 – High Efficiency 48V to 12V 400kHz Synchronous Buck Regulator
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.3
Application Curves
8.3
Power Supply Recommendations
8.4
Layout
8.4.1
Layout Guidelines
8.4.2
Thermal Design and Layout
8.4.3
Layout Example
9
Device and Documentation Support
9.1
Device Support
9.1.1
Development Support
9.1.1.1
Custom Design With WEBENCH® Tools
9.2
Documentation Support
9.2.1
Related Documentation
9.2.1.1
PCB Layout Resources
9.2.1.2
Thermal Design Resources
9.3
接收文档更新通知
9.4
支持资源
9.5
Trademarks
9.6
静电放电警告
9.7
术语表
10
Revision History
11
Mechanical, Packaging, and Orderable Information
封装选项
机械数据 (封装 | 引脚)
RRX|29
MPQF604D
散热焊盘机械数据 (封装 | 引脚)
订购信息
zhcsm29a_oa
zhcsm29a_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
可提供有助于功能安全设计的文档
具有多功能降压控制器和稳健功率 MOSFET 的同步直流/直流转换器
宽输入电压范围:4.5V 至
80V
关断模式电流:2.3µA
将 48V 电压调节至 5V 的空载 I
Q
:8.2µA
1% 精度、固定 3.3V/5V/12V 或 0.8V 至
55V
可调输出电压
双相运行模式下的输出电流高达 16A
进行了优化,可满足低 EMI 要求
有助于符合
CISPR 25 5 级
标准
引脚可选式 ±8% 双随机展频可降低峰值发射
开关频率:200kHz 至 2.2MHz
引脚可配置自动或 FPWM 运行
固有保护特性,可实现稳健设计
内部断续模式过流保护
使能、电源正常和热关断
内部或外部环路补偿
6mm × 6mm 热优化,符合 RoHS 标准,QFN-29 封装,具有无铅镀层
使用
LM708x0-Q1
并借助
WEBENCH®
Power Designer
创建定制设计方案