TPS54680

SLVS429B − OCTOBER 2002 − REVISED OCTOBER 2005

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

PWM SWITCHER WITH INTEGRATED FETs (SWIFT

™) FOR SEQUENCING

6,4 mm X 9,7 mm

Typical Size

FEATURES

Efficiency at 6-A Continuous Output Source

or Sink Current

Fixed 350 kHz or Adjustable 280 kHz to

700 kHz

Thermal Shutdown

Component Count

APPLICATIONS

Systems

Performance DSPs, FPGAs, ASICs and

Microprocessors Requiring Sequencing

Communications Infrastructure

DESCRIPTION

As a member of the SWIFT™ family of dc/dc regulators,

the TPS54680 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 under-voltage-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 TPS54680 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

Core Supply

COMP

AGND

VBIAS

Input

TPS54680

TRACKIN

I/O Supply

t − Time − 500 µs/div

STARTUP TIMING

I/O

CORE

PWRGD(I/O)

PWRGD(CORE)

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.

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Copyright © 2002 − 2005, Texas Instruments Incorporated