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FAN5343

6-LED Series Boost LED Driver with Integrated Schottky Diode and Single-Wire Digital Interface

Fairchild Semiconductor 

August 2010

FAN5343

6-LED Series Boost LED Driver with Integrated Schottky

Diode and Single-Wire Digital Interface

Features

ƒ Asynchronous Boost Converter

− VOUT up to 24V

ƒ Internal Schottky Diode

ƒ Up to 500mW Output Power

ƒ 2.7V to 5.5V Input Voltage Range

ƒ Single-Wire Digital Control Interface to Set LED

Brightness Levels

− 32 Linear Steps

ƒ Fixed Switching Frequency: 1.2MHz

ƒ Soft-Start Capability

ƒ Input Under-Voltage Lockout (UVLO)

ƒ Output Over-Voltage Protection (OVP)

ƒ Short-Circuit Detection

ƒ Thermal Shutdown Protection (TSD)

ƒ Small 6-Lead 2.0 x 2.0 x 0.55mm UMLP Package

Applications

ƒ Cellular Mobile Handsets

ƒ Mobile Internet Devices

ƒ Portable Media Players

ƒ PDA, DSC, MP3 Players

Description

The FAN5343 is an asynchronous constant-current LED

driver capable of efficiently delivering up to 500mW to a

string of six (6) LEDs in series. Optimized for small form

factor applications, the 1.2MHz fixed switching frequency

allows the use of small chip inductors and capacitors.

The FAN5343 uses a single-wire digital control interface to

program the brightness levels of the LEDs in 32 linear steps

by applying digital pulses.

For safety, the device features integrated over-voltage, over-

current, short circuit detection, and thermal shutdown

protection. In addition, input under-voltage lockout protection

is triggered if the battery voltage is too low.

The FAN5343 is available in a very low profile, small form

factor 2mm x 2mm x 0.55mm 6-lead UMLP package that is

green and RoHS compliant.

Ordering Information

Part Number

Temperature Range

FAN5343UMPX

-40 to 85 °C

Package

6-Lead, Ultra-Thin Molded Leadless (UMLP)

Package

Packing

Tape and Reel

© 2009 Fairchild Semiconductor Corporation

FAN5343 • Rev. 1.0.4

www.fairchildsemi.com

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