TPS54380-Q1

SLVS836 − JUNE 2008

3-V TO 6-V INPUT, 3-A OUTPUT TRACKING SYNCHRONOUS BUCK

PWM SWITCHER WITH INTEGRATED FETs (SWIFT

) FOR SEQUENCING

6,4 mm X 6,6 mm

Typical Size

FEATURES

at 3-A Continuous Output Source or Sink

Current

Fixed 350 kHz or Adjustable 280 kHz to

700 kHz

Thermal Shutdown

Component Count

APPLICATIONS

Systems

High-Performance DSPs, FPGAs, ASICs, and

Microprocessors Requiring Sequencing

Communications Infrastructure

DESCRIPTION

As a member of the SWIFT

 family of dc/dc regulators,

the TPS54380 low-input voltage, high-output current,

synchronous buck PWM converter integrates all

required active components. Using the TRACKIN pin

with other regulators, simultaneous power up and down

are easily implemented. Included on the substrate with

the listed features are a true, high-performance, voltage

error amplifier that enables maximum performance and

flexibility in choosing the output filter L and C

components; an undervoltage-lockout circuit to prevent

start-up until the input voltage reaches 3 V; an internally

or externally set slow-start circuit to limit inrush

currents;

and

a

power-good

output

useful

for

processor/logic reset.

The TPS54380 is available in a thermally enhanced

20-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

Core Supply

COMP

AGND

VBIAS

Input

TPS54380

TRACKIN

I/O Supply

VI/O = 3.3 V

Vcore = 1.8 V

START-UP WAVEFORM

1 ms/div

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

 2008, Texas Instruments Incorporated