原标题：TI TPS22967单通道4A负载开关参考设计方案

　　TI公司的TPS22967是一款小型超低导通电阻的单通道负载可控制转换开关器件，内建N沟道MOSFET都场效应管，输入电压范围为：0.8V至5.5V，最大持续电流为4A。该芯片可以通过一个低电压控制信号控制开关。当开关关断时，在TPS22967内部有一个225Ω的下拉电阻，可以快速地对输出端进行放电。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 TPS22967 is a small, ultra-low RON, single channel load switch with controlled turn on. The device contains an N-channel MOSFET that can operate over an input voltage range of 0.8V to 5.5V and can support a maximum continuous current of 4A. The switch is controlled by an on/off input (ON), which is capable of interfacing directly with low-voltage control signals. In the TPS22967, a 225-Ω pull-down resistor is added for quick output discharge when switch is turned off.

　　The TPS22967 is available in a small, space-saving 2mm x 2mm 8-pin SON package (DSG) with integrated thermal pad allowing for high power dissipation. The device is characterized for operation over the free-air temperature range of –40°C to 85°C.

　　TPS22967主要特性：

　　Integrated Single Channel Load Switch

　　Input Voltage Range: 0.8V to 5.5V

　　Ultra low RON Resistance

　　RON = 22mΩ at VIN = 5V (VBIAS = 5V)

　　RON = 22mΩ at VIN = 3.6V (VBIAS = 5V)

　　RON = 22mΩ at VIN = 1.8V (VBIAS = 5V)

　　4A Maximum Continuous Switch Current

　　Low Quiescent Current (50µA)

　　Low Control Input Threshold Enables Use of 1.2V/1.8V/2.5V/3.3V Logic

　　Configurable Rise Time

　　Quick Output Discharge (QOD)

　　SON 8-pin Package With Thermal Pad

　　ESD Performance Tested per JESD 22

　　2KV HBM and 1KV CDM

　　TPS22967应用：

　　Ultrabook

　　Notebooks/Netbooks

　　Tablet PC

　　Consumer Electronics

　　Set-top Boxes/Residental Gateways

　　Telecom Systems

　　Solid State Drives (SSD)

　　图1. TPS22967内部方框图

　　TPS22967方案介绍：

　　The TPS22967EVM-023 evaluation module contains a single channel, ultra low ON resistance, 4-A load switch with controlled turn-on and adjustable rise time。

　　TPS22967方案原理图：

　　图2. TPS22967方案原理图

　　TPS22967方案材料清单：

　　PCB元件布局图：