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参数

Vin (Min) (V) 2.95 Vin (Max) (V) 5.5 Vout (Min) (V) 0.8 Vout (Max) (V) 5 Iout (Max) (A) 5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 500 Features Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Control mode Current Mode Duty cycle (Max) (%) 85 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new 查找其它 降压转换器(集成开关)

封装|引脚|尺寸

HTSSOP (PWP) 16 32 mm² 5 x 6.4 open-in-new 查找其它 降压转换器(集成开关)

特性

  • LM20125Q is AEC-Q100 Qualified and Manufactured on an Automotive Grade Flow
  • Input Voltage Range 2.95V to 5.5V
  • Accurate Current Limit Minimizes Inductor Size
  • 97% Efficiency with 500 kHz Switching Frequency
  • 32 mΩ Integrated FET Switches
  • Starts up into Pre-Biased Loads
  • Output Voltage Tracking
  • Peak Current Mode Control
  • Adjustable Output Voltage Down to 0.8V
  • Adjustable Soft-Start with External Capacitor
  • Precision Enable Pin with Hysteresis
  • Integrated OVP, UVLO, Power Good and Thermal Shutdown
  • HTSSOP 16-Pin Exposed Pad Package

All trademarks are the property of their respective owners.

open-in-new 查找其它 降压转换器(集成开关)

描述

The LM20125 is a full featured 500 kHz synchronous buck regulator capable of delivering up to 5A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20125 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20125 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20125 is offered in a 16-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

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LM20136 正在供货 具有输入同步功能的 2.95-5.5V、6A 电流模式同步降压稳压器 Higher Iout (6 A) and input frequency synchronization pin.

技术文档

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类型 标题 下载最新的英文版本 发布
* 数据表 LM20125/LM20125Q 5A, 500kHz PowerWise ® Synchronous Buck Regulator 数据表 2013年 3月 27日
技术文章 Minimize the impact of the MLCC shortage on your power application 2019年 3月 29日
选择指南 电源管理指南 2018 (Rev. K) 2018年 7月 31日
用户指南 AN-1687 LM20125 Evaluation Board 2013年 5月 3日
应用手册 AN-1752 5A LM20k Reference Designs 2013年 5月 3日
应用手册 AN-2077 LM20k POL Module 2013年 5月 3日
用户指南 Application Note 1687 LM20125 Evaluation Board 2007年 10月 30日

设计与开发

有关其他条款或所需资源,请点击下面的任何链接来查看详情页面。

硬件开发

评估板 下载
document-generic 用户指南
$49.00
特性
  • Input voltage range 2.95V to 5.5V
  • Accurate current limit minimizes inductor size
  • 96% efficiency with 500 kHz switching frequency
  • 32 mΩ integrated FET switches
  • Starts up in pre-biased loads
  • Output voltage tracking
  • Peak current mode control
  • Adjustable output voltage down to 0.8V
  • Adjustable Soft-Start with (...)

设计工具和仿真

仿真模型 下载
SNVM626.ZIP (8 KB) - TINA-TI Spice Model
仿真模型 下载
SNVM627.TSC (1008 KB) - TINA-TI Reference Design
仿真模型 下载
SNVM628.ZIP (11 KB) - TINA-TI Spice Model
仿真模型 下载
SNVM629.TSC (53 KB) - TINA-TI Reference Design
计算工具 下载
LM20125 设计电子表格
LM20125DESIGN-CALC

CAD/CAE 符号

封装 引脚 下载
HTSSOP (PWP) 16 视图选项

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