November 2009

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN5341 • Rev. 1.0.0

FAN5341

Series Boost LED Driver with Integrated Schottky Diode and

Single-Wire Digital Interface

Features

Asynchronous Boost Converter

Internal Schottky Diode

Up to 500mW Output Power

Drives 3 to 5 LEDs in Series

2.7V to 5.5V Input Voltage Range

Single-Wire Digital Control Interface to Set LED

Brightness Levels

− 32 Linear Steps

1.2MHz Fixed Switching Frequency

Soft-Start Capability

Input Under-Voltage Lockout (UVLO)

Output Over-Voltage Protection (OVP)

Short-Circuit Detection

Thermal Shutdown (TSD) Protection

Low Profile 6-lead 2.0 x 2.0 x 0.55mm UMLP Package

Applications

Cellular Mobile Handsets

Mobile Internet Devices

Portable Media Players

PDA, DSC, MP3 Players

Description

The FAN5341 is an asynchronous constant-current LED

driver capable of efficiently delivering up to 500mW to a

string of up to five 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 FAN5341 uses a simple 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 FAN5341 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

Eco Status

Package

Packing

FAN5341UMPX

-40 to 85°C

Green

6-lead, 2.0 x 2.0mm UMLP

Tape and Reel