1 Features

1• Up to 1.5-A Maximum Load Current

• ±6% Current-Limit Accuracy at 1.7 A (Typical)

• Meets USB Current-Limiting Requirements

• Backwards Compatible With TPS2550 and

TPS2551

• Adjustable Current Limit: 75 mA to 1700 mA

(Typical)

• Constant-Current (TPS255x) and Latch-Off

(TPS255x-1) Versions

• Fast Overcurrent Response - 2 μs (Typical)

• 85-mΩ High-Side MOSFET (DBV Package)

• Reverse Input-Output Voltage Protection

• Operating Range: 2.5 V to 6.5 V

• Built-In Soft Start

• 15-kV ESD Protection per IEC 61000-4-2 (With

External Capacitance)

• UL Listed – File No. E169910 and NEMKO

IEC60950-1-am1 ed2.0

• See the TI Switch Portfolio

2 Applications

• USB Ports and Hubs

• Digital TVs

• Set-Top Boxes

• VOIP Phones

3 Description

The TPS255x and TPS255x-1 power-distribution

switches are intended for applications where

precision current limiting is required or heavy

capacitive loads and short circuits are encountered

and provide up to 1.5 A of continuous load current.

These devices offer a programmable current-limit

threshold between 75 mA and 1.7 A (typical) through

an external resistor. Current-limit accuracy as tight as

±6% can be achieved at the higher current-limit

settings. 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 using a constant-current mode when the

output load exceeds the current-limit threshold.

TPS255x-1 devices provide circuit breaker

functionality by latching off the power switch during

overcurrent or reverse-voltage situations. An internal

reverse-voltage comparator disables the powerswitch

when the output voltage is driven higher than

the input to protect devices on the input side of the

switch. The FAULT output asserts low during

overcurrent and reverse-voltage conditions.