TPS65252

USB _ Vo

USB _EN

USB _ nILIM

LX 2

BST 2

LX 1

VIN 2

LX 2

VIN 1

LX 1

V 3 V

V 1

VIN 1

USB _ VIN

VIN 2

V 2

USB _O

Host

USB _I

PGOOD

rUSB

FB 1

FB 2

Host

Host

TPS65252

SLVSAM1B

– DECEMBER 2010 – REVISED FEBRUARY 2011

www.ti.com

The USB switch provides up to 1-A of current as required by downstream USB devices. When the output load

exceeds the current-limit threshold selected with an external resistor or a short is present, the PMU limits the

output current to a safe level by switching into a constant-current mode and pulling the over current logic output

low. When continuous heavy overloads and short-circuits increase the power dissipation in the switch, causing

the junction temperature to rise, a thermal protection circuit shuts off the switch to allow continuous

non-interrupted operation the buck converters.

The TPS65252 features a supervisor circuit that monitors both converters and provides a PGOOD signal (End of

Reset) with a 256-ms timer.

TPS65252 is packaged in a small, thermally efficient 28-pin QFN package.

This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more

susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

TYPICAL APPLICATION

2

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Product Folder Link(s): TPS65252