6,4 mm X 9,7 mm

Typical Size

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FEATURES

DESCRIPTION

APPLICATIONS

PVIN

PH

BOOT

PGND

VSENSE

Output

COMP

AGND

VBIAS

Voltage

Input 1

TPS54073

*

*

*

TYPICAL APPLICATION

R = 1.5

L

W

V

= 1.5 V

(core)

t - Time - 5 ms/div

START-UP WAVEFORM

WITH 3 PRECHARGE DIODES

VIN

Voltage

Input 2

TPS54073

SLVS547 – FEBRUARY 2005

2.2 – 4 -V, 14-A SYNCHRONOUS BUCK CONVERTER

WITH DISABLED SINKING DURING START-UP

•

8-m

Ω MOSFET Switches for High Efficiency at

As a member of the SWIFT™family of dc/dc regu-

14.5-A Peak Output Current

lators, the TPS54073 low-input voltage high-output

current synchronous buck PWM converter integrates

•

Separate Low-Voltage Power Bus

all required active components. Included on the

•

Disabled Current Sinking During Start-Up

substrate with the listed features are a true, high

•

Adjustable Output Voltage Down to 0.9 V

performance, voltage error amplifier that enables

maximum performance and flexibility in choosing the

•

Wide PWM Frequency: Fixed 350 kHz, 550 kHz

output

filter

L

and

C

components;

an

or Adjustable 280 kHz to 700 kHz

undervoltage-lockout circuit to prevent start-up until

•

Synchronizable to 700 kHz

the input voltage reaches 3 V; an internally or

•

Load Protected by Peak Current Limit and

externally

set

slow-start

circuit

to

limit

in-rush

Thermal Shutdown

currents; and a power good output useful for

processor/logic reset, fault signaling, and supply se-

•

Integrated Solution Reduces Board Area and

quencing.

Total Cost

For reliable power up in output precharge appli-

cations, the TPS54073 is designed to only source

current during start-up.

•

Low-Voltage, High-Density Distributed Power

Systems

The TPS54073 is available in a thermally enhanced

•

Point of Load Regulation for High-

28-pin TSSOP (PWP) PowerPAD™ package, which

Performance DSPs, FPGAs, ASICs, and

eliminates bulky heatsinks. TI provides evaluation

Microprocessors

modules and the SWIFT™ designer software tool to

aid in quickly achieving high-performance power

•

Broadband, Networking, and Optical

supply designs to meet aggressive equipment devel-

Communications Infrastructure

opment cycles

•

Power PC Series Processors

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.

SWIFT, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.