TPS54073 Datasheet_PDF文件下载_芯片资料查询

Typical Size

6,4 mm X 9,7 mm

TPS54073

SLVS547 鈥?FEBRUARY 2005

www.ti.com

2.2 鈥?4 -V, 14-A SYNCHRONOUS BUCK CONVERTER

WITH DISABLED SINKING DURING START-UP

FEATURES

鈥?/div>

8-m鈩?MOSFET Switches for High Efficiency at

14.5-A Peak Output Current

Separate Low-Voltage Power Bus

Disabled Current Sinking During Start-Up

Adjustable Output Voltage Down to 0.9 V

Wide PWM Frequency: Fixed 350 kHz, 550 kHz

or Adjustable 280 kHz to 700 kHz

Synchronizable to 700 kHz

Load Protected by Peak Current Limit and

Thermal Shutdown

Integrated Solution Reduces Board Area and

Total Cost

DESCRIPTION

As a member of the SWIFT鈩amily of dc/dc regu-

lators, the TPS54073 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 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 in-rush

currents; and a power good output useful for

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

quencing.

For reliable power up in output precharge appli-

cations, the TPS54073 is designed to only source

current during start-up.

The TPS54073 is available in a thermally enhanced

28-pin TSSOP (PWP) PowerPAD鈩?package, which

eliminates bulky heatsinks. TI provides evaluation

modules and the SWIFT鈩?designer software tool to

aid in quickly achieving high-performance power

supply designs to meet aggressive equipment devel-

opment cycles

START-UP WAVEFORM

WITH 3 PRECHARGE DIODES

RL = 1.5

W

APPLICATIONS

鈥?/div>

Low-Voltage, High-Density Distributed Power

Systems

Point of Load Regulation for High-

Performance DSPs, FPGAs, ASICs, and

Microprocessors

Broadband, Networking, and Optical

Communications Infrastructure

Power PC Series Processors

TYPICAL APPLICATION

*

Voltage

Input 1

PVIN

PH

TPS54073

BOOT

PGND

VIN

VBIAS VSENSE

AGND COMP

*

Output

V

I/O

= 3.3 V

Voltage

Input 2

500 mV/div

V

(core)

= 1.5 V

*

Optional

t - Time - 5 ms/div

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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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