TI TPS24700 2.5V到18V高效热插拔电源参考设计方案

TI公司的TPS24700是一款易用的驱动外部N沟道MOSFET场效应管，2.5V至18V输入支持热插拔的电源转换控制器。该控制器芯片具有可编程的电流限制和故障时间保护功能，以解决上电启动时负载或供电端极度过流。正常启动后，除在极度过载情况下立刻将负载断开外，当电流超过用户设置值时，负载并没有马上断开，只有当过流时间超过设置时间值时才会断开。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。
The TPS24700/1 is an easy-to-use, 2.5 V to 18 V, hot-swap controller that drives an external N-channel MOSFET. The programmable current limit and fault time protect the supply and load from excessive current at startup. After startup, currents above the user-selected limit are allowed to flow until programmed timeout – except in extreme overload events when load is immediately disconnected from source. The low, 25-mV current sense threshold is highly accurate and allows use of smaller, more-efficient sense resistors, yielding lower power loss and smaller footprint. A power-good output is provided for status monitoring and downstream load control.
TPS24700/1 replaces the LTC4211 in existing designs with no PCB board changes and only minor external component changes – yielding a more accurate, efficient solution.
TPS24700主要特性：
2.5-V to 18-V Operation
Accurate Current Limiting for Starup
Accurate 25-mV Current Sense Threshold
Timed Overcurrent Breaker
Power-Good Output
Fast Breaker for Short-Circuit Protection
Latch Off (TPS24700) and Retry Versions (TPS24701)
Programmable UV Threshold
Drop-In Upgrade for LTC4211 – No Layout Changes
Small MSOP-8 Package
APPLICATIONS
Server Backplanes
Storage Area Networks (SAN)
Medical Systems
Plug-In Modules
Base Stations
Consumer Electronics
TPS24700应用：
Server Backplanes
Storage Area Networks (SAN)
Medical Systems
Plug-In Modules
Base Stations
Consumer Electronics

图1. TPS24700内部方框图
TPS24700方案介绍：