深圳市中立信电子科技有限公司

1 Features

1• Meets USB Current-Limiting Requirements

• Adjustable Current Limit, 500 mA to 5 A (Typical)

• ±6.5% Current-Limit Accuracy at 4.5 A

• Fast Overcurrent Response: 3.5-μs (Typical)

• 22-mΩ High-Side MOSFET

• Operating Voltage: 2.5 V to 6.5 V

• 2-μA Maximum Standby Supply Current

• Built-in Soft Start

• 15-kV and 8-kV System-Level ESD Capable

• UL Listed: File No. E169910 and CB IEC60950-1-

am2 ed2.0

2 Applications

• USB Ports and Hubs

• Digital TVs

• Set-Top Boxes

• VOIP Phones

3 Description

The TPS255x power-distribution switch is intended

for applications where precision current limiting is

required or heavy capacitive loads and short circuits

are encountered. These devices offer a

programmable current-limit threshold between

500 mA and 5 A (typical) through an external resistor.

The power-switch rise and fall times are controlled to

minimize current surges during turnon and turnoff.

TPS255x devices limit the output current to a safe

level by switching into a constant-current mode when

the output load exceeds the current-limit threshold.

The FAULT logic output asserts low during

overcurrent and overtemperature conditions.

1功能

满足USB电流限制要求

•可调电流限制，500毫安至5a(典型)

•限流精度在4.5±6.5%

•快速过电流响应:3.5 -μs(典型的)

•22-mΩ高端MOSFET

·工作电压:2.5 V ~ 6.5 V

•2-μA备用电源电流

•内置软启动

•具备15-kV和8-kV系统级ESD能力

•UL列出:文件编号。E169910和CB IEC60950-1-

am2 ed2.0

2应用程序

•USB端口和集线器

•数字电视

•机顶盒

•VOIP电话

3描述

TPS255x配电开关

适用于限流的应用场合

需要或较大的容性负载和短路

是遇到了。这些设备提供了

可编程限流阀之间

500ma和5a(典型)通过外部电阻器。

电源开关的升降时间由控制

限度的减少电流波动期间turnon和关闭。

TPS255x装置将输出电流限制在安全范围内

水平通过切换到恒流模式时

输出负载超过了电流限制阈值。

在此期间，故障逻辑输出断言为低

过流和超温条件。