FEATURES

On Board Power MOSFET

Drives up to 4 strings of parallel LEDs

Up to 87% Efficiency

1.4MHz Fixed Switching Frequency

Open Load Shutdown

Low 100mV Feedback Voltage

Soft Start

PWM Dimming Control

UVLO, Thermal Shutdown

Internal Circuit Limit

Available in SOT26 Package

APPLICATIONS

WLED Backlight

Cell Phones

Handheld Computers and PDAs

Digital Cameras

Small LCD Displays

LED Module

Game Devices

DESCRIPTION

The PS1313 is a step up converter designed for

driving up to 4 branches with 4 white LEDs in series

in each branch, providing backlight in cell phones,

PDAs, and other hand-held devices. The PS1313

uses current mode, fixed frequency architecture to

regulate the LED current, which is measured

through an external current sense resistor. Its low

100mV feedback voltage reduces power loss and

improves efficiency. The OV pin monitors the output

voltage and turns off the converter if an over-

voltage condition is present due to an open circuit

condition.

The PS1313 includes under-voltage lockout, current

limiting and thermal overload protection preventing

damage in the event of an output overload. The

PS1313 is available in small 6-pin SOT26 Package.

TYPICAL APPLICATION CIRCUIT

High Efficiency, High Power

White-LED Driver

PS1313

Fig: Typical Application Circuit with 20mA Output

July 2007

www.picsemi.com

© 2007 Power IC. All Rights Reserved.

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