OUT

OUT

IN

IN

GND

FAULT

ILIM

EN

100 k

Control Signal

2.5V – 6.5V

VOUT

TPS2556/57

0.1 uF

Fault Signal

Power Pad

EN = Active Low for the TPS2556

EN = Active High for the TPS2557

1

2

3

4

5

6

OUT

FAULT

ILIM

IN

GND

IN

PAD

7

8

EN

OUT

TPS2556/57

DRB PACKAGE

(TOP VIEW)

TPS2556

TPS2557

www.ti.com

SLVS931A

– NOVEMBER 2009 – REVISED FEBRUARY 2012

PRECISION ADJUSTABLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

Check for Samples: TPS2556, TPS2557

1

FEATURES

APPLICATIONS

2

•

Meets USB Current-Limiting Requirements

•

USB Ports/Hubs

•

Adjustable Current Limit, 500 mA

–5 A (typ)

•

Digital TV

•

+/- 6.5% Current-Limit Accuracy at 4.5 A

•

Set-Top Boxes

•

Fast Overcurrent Response - 3.5-

μS (typ)

•

VOIP Phones

•

22-m

Ω High-Side MOSFET

DESCRIPTION

•

Operating Range: 2.5 V to 6.5 V

The TPS2556/57 power-distribution switches are

•

2-

μA Maximum Standby Supply Current

intended for applications where precision current

•

Built-in Soft-Start

limiting is required or heavy capacitive loads and

short circuits are encountered. These devices offer a

•

15 kV / 8 kV System-Level ESD Capable

programmable current-limit threshold between 500

•

UL Listed*

– File No. E169910

mA and 5.0 A (typ) via an external resistor. The

•

CB

& Nemko Certification*

power-switch rise and fall times are controlled to

minimize current surges during turn on/off.

•

TPS2556/57 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 over temperature conditions.

Figure 1. Typical Application as USB Power Switch

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PowerPAD is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2009–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.