TPS2148

TPS2158

SLVS373 – AUGUST 2001

3.3-V LDO AND DUAL SWITCH

FOR USB PERIPHERAL POWER MANAGEMENT

1

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FEATURES

USB Bus-Powered Peripherals

With Enable

Protection for LDO and Each Switch

APPLICATIONS

– Digital Cameras

– Zip Drives

– Speakers and Headsets

DESCRIPTION

The TPS2148 incorporates two power distribution

switches and an LDO in one small package, providing

a USB peripheral power management solution that

saves up to 60% in board space over typical

implementations.

The TPS2148 meets USB 2.0 bus-powered peripheral

requirements. An integrated LDO regulates the 5-V bus

power down to 3.3 V for the USB controller, and a

MOSFET switch that is internally connected to the

output of the LDO simplifies meeting the suspend and

enumeration current requirements imposed by the USB

specification.

A second switch is available to support a downstream

port, stage power to a second voltage regulator, or

disable power to selected circuitry in power-save

modes.

Each power-distribution switch is capable of supplying

200 mA of continuous current, and the independent

logic enables are compatible with 5-V logic and 3-V

logic. The switches and the LDO are designed with

controlled rise times and fall times to minimize current

surges.

The TPS2148 has active-low enables while the

TPS2158 has active-high enables.

LDO and dual switch family selection guide and schematics

LDO

LDO_OUT

LDO_ADJ

OC1

OUT1

OUT2

OC2

VIN/SW1

LDO_EN

EN1

SW2

EN2

GND

TPS2145/55

TSSOP–14

LDO

OC1

OC2

EN1

SW2

EN2

GND

TPS2147/57

MSOP–10

LDO

EN2

EN1

GND

TPS2148/58

MSOP–8

LDO

OC

EN1

EN2

GND

TPS2149/59

MSOP–8

VIN/SW1

LDO_OUT

OUT1

OUT2

VIN/SW1

LDO_EN

LDO_OUT

OUT2

OUT1

VIN

LDO_OUT

OUT1

OUT2

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

PowerPAD is a trademark of Texas Instruments.

Copyright

 2001, Texas Instruments Incorporated

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.