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FEATURES

APPLICATIONS

DESCRIPTION

R2

2

3

5

4

AVIN PVIN

FB

GND

SW

6

BOOST

C1

C2

C3

L1

R1

D1

UDG−04135

TPS40222

1

0

0.2

0.4

0.6

0.8

1.0

60

70

100

1.2

1.4

1.6

80

90

65

95

75

85

TPS40222

SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006

1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm

× 3 mm SON PACKAGE

•

Disk Drives

•

•

Set Top Box

•

•

Point of Load Power

•

0 A to 1.6 A Current Capability

•

ASIC Power Supplies

•

Fixed 1.25-MHz Switching Frequency

•

Reference 0.8 V ±1%

•

Internal 250 m

Ω N-Channel MOSFET Switch

The TPS40222 is a fixed-frequency, current-mode,

•

Current Mode Control with Internal Slope

non-synchronous

buck

converter

optimized

for

Compensation

applications powered by a 5-V distributed source.

•

Internal Soft-Start

With

internally

determined

operating

frequency,

soft-start time, and control loop compensation, the

•

Internal Loop Compensation

TPS40222 provides many features with a minimum of

•

Short Circuit Protection

external components.

•

Thermal Shutdown

The TPS40222 operates at 1.25 MHz and supports

•

High Efficiency Up to 92%

up to 1.6-A output loads. The output voltage can be

•

Small 3 mm

× 3 mm SON Package

programmed to as low as 0.8 V. The TPS40222

utilizes

pulse-by-pulse

current

limit

as

well

as

frequency foldback to protect the converter during a

catastrophic short circuited output condition.

SIMPLIFIED APPLICATION DIAGRAM

TYPICAL EFFICIENCY

vs

LOAD CURRENT

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2005–2006, 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.