LM3224

L

D

SW

5

FB

2

GND

4

Battery or

Power Source

SS

8

Optional

FSLCT

6

7

SHDN

3

1

LM3224

www.ti.com

SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005

LM3224 615kHz/1.25MHz Step-up PWM DC/DC Converter

Check for Samples: LM3224

1

FEATURES

APPLICATIONS

2

•

Operating voltage range of 2.7V to 7V

•

TFT Bias Supplies

•

615kHz/1.25MHz pin selectable frequency

•

Handheld Devices

operation

•

Portable Applications

•

Over temperature protection

•

GSM/CDMA Phones

•

Optional soft-start function

•

Digital Cameras

•

8-Lead MSOP package

•

White LED Flash/Torch Applications

DESCRIPTION

The LM3224 is a step-up DC/DC converter with a 0.15

Ω (typ.), 2.45A (typ.) internal switch and pin selectable

operating frequency. With the ability to convert 3.3V to multiple outputs of 8V, -8V, and 23V, the LM3224 is an

ideal part for biasing TFT displays. With the high current switch it is also ideal for driving high current white LEDs

for flash applications. The LM3224 can be operated at switching frequencies of 615kHz and 1.25MHz allowing

for easy filtering and low noise. An external compensation pin gives the user flexibility in setting frequency

compensation, which makes possible the use of small, low ESR ceramic capacitors at the output. An external

soft-start pin allows the user to control the amount of inrush current during start up. The LM3224 is available in a

low profile 8-lead MSOP package.

Typical Application Circuit

1

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.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, 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.