UNISONIC TECHNOLOGIES CO., LTD

L5101

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

1 of 10

Copyright © 2009 Unisonic Technologies Co., Ltd

QW-R103-026.B

WHITE LED STEP-UP

CONVERTER

DESCRIPTION

The UTC L5101 is a constant current step-up PWM DC/DC

converter optimized to drive white LEDs. It can drive LEDs in series

with a Li-Ion cell.

The switching frequency of the internal NPN is up to 1.2MHz.

High frequency allows the use of tiny external components and the

current setting resistor has minimum power dissipation for the low

feedback voltage of 95mV. The built-in OVP prevents the UTC

L5101

damage from the open load condition.

Series connection of LEDs provides identical LED currents which

contributes to uniform brightness, saving the use of ballast

resistors.

The UTC L5101 is universally used in cellular phones, PDAs ,

DSCs, handheld devices, and white LED display backlighting.

FEATURES

* Open Circuit and Over Voltage Protection

* High Efficiency: 86% Typical

* Switching Frequency: 1.2MHz

* Supply Current is 1.0mA

* Matches LED Current

* Requires Tiny Inductor and Capacitors

* Halogen Free

SOT-26

4

5

3

2

1

6

ORDERING INFORMATION

Ordering Number

Package

Packing

L5101G-AG6-R

SOT-26

Tape Reel

MARKING