TPS54872

SLVS436C − JULY 2002 − REVISED FEBRUARY 2005

8A OUTPUT, 4V TO 6V INPUT TRACKING/TERMINATION

SYNCHRONOUS PWM SWITCHER WITH INTEGRATED FETs (SWIFT)

6,4 mm x 9,7 mm

FEATURES

at 8-A Continuous Output Source or Sink

Current

Fixed 350 kHz or Adjustable 280 kHz to

700 kHz

Thermal Shutdown

Total Cost

APPLICATIONS

High-Speed Logic Families

DESCRIPTION

As a member of the SWIFT

 family of dc/dc regulators,

the TPS54872 low-input voltage high-output current

synchronous-buck

PWM

converter

integrates all

required active components. Included on the substrate

with the listed features are a true, high performance,

voltage

error

amplifier

that

enables

maximum

performance under transient conditions and flexibility in

choosing the output filter L and C components; an

under-voltage-lockout circuit to prevent start-up until

the input voltage reaches 3.8 V; an internally set

slow-start circuit to limit in-rush currents; and a status

output to indicate valid operating conditions.

The TPS54872 is available in a thermally enhanced

28-pin TSSOP (PWP) PowerPAD

 package, which

eliminates bulky heatsinks. TI provides evaluation

modules and the SWIFT designer software tool to aid

in quickly achieving high-performance power supply

designs to meet aggressive equipment development

cycles.

SIMPLIFIED SCHEMATIC

VIN

PH

BOOT

PGND

VSENSE

V(TTQ)

AGND

VBIAS

Input

TPS54872

COMP

Compensation

Network

REFIN

t − Time − 100 ms/div

TRANSIENT RESPONSE

VI = 5 V,

VO = 1.25 V

2 A to 6 A

V(DDQ)

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 and SWIFT are trademarks of Texas Instruments.

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.

www.ti.com

Copyright

 2002 − 2005, Texas Instruments Incorporated