R4

1 M

C1

10 µF

C

22 µF

OUT

L

VIN

EN

ILIM

GND

VOUT

FB

PG

R

20 k

ILIM

C

100 pF

FF

V

IN

R2

243 k

L1

1 H

R1

768 k

V

OUT

TPS61252

Power Good

Output

2.3 V to

6.0 V

5.0 V

TPS61252

www.ti.com

SLVSAG3 – SEPTEMBER 2010

TINY 1.5-A BOOST CONVERTER WITH ADJUSTABLE INPUT CURRENT LIMIT

Check for Samples: TPS61252

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FEATURES

•

Short Circuit Protection

•

Resistor Programmable Input Current Limit

•

Typical Operating Frequency 3.25 MHz

–

±20% Current Accuracy at 500 mA over Full

•

Available in a 2×2-mm QFN-8 Package

Temperature Range

APPLICATIONS

–

Programmable from 100 mA up to 1500 mA

•

USB Host Supplies from a Single Li-Ion

•

Up to 92% Efficiency

Battery

•

•

Current Limited Applications

•

Power Good Indicates Appropriate Output

•

Li-Ion Applications

Voltage Level

•

Audio Applications

•

Adjustable Output Voltage up to 6.5 V

•

RF-PA Buffer

•

•

Load Disconnect and Reverse Current

Protection

DESCRIPTION

The TPS61252 device provides a power supply solution for products powered by either a three-cell alkaline,

NiCd or NiMH battery, or an one-cell Li-Ion or Li-polymer battery. The wide input voltage range is ideal to power

portable applications like mobile phones or for computer peripherals. The device has a resistor programmable

During light loads the device will automatically enter skip mode (PFM), which allows the converter to maintain the

required output voltage, while only drawing 30 mA from the battery. This will allow maximum efficiency at lowest

quiescent currents.

TPS61252 allows the use of small inductors and input capacitors to achieve a small solution size. The possibility

to reduce the current limit by a external resistor offers the potential use of physically even smaller inductors with

lower rated current to further reduce total solution sizes of the power supply. During shutdown, the load is

completely disconnected from the battery. The TPS61252 is available in a 8-pin QFN package measuring 2×2

mm (DSG).

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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 © 2010, 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.