UNISONIC TECHNOLOGIES CO., LTD

L5101

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

1 of 9

Copyright © 2005 Unisonic Technologies Co., Ltd

QW-R103-026,A

WHITE LED STEP-UP

CONVERTER

DESCRIPTION

The UTC L5101 is a fixed frequency step-up PWM DC/DC

converter and designed for white LEDS driving with a constant

current to provide backlight in handheld devices. The device

switches at a high frequency 1.2MHz by an internal N-channel

MOSFET switch to be capable of minimum external components

using.

The UTC L5101 can drive up to 5 LEDs in series by a Li-Ion cell.

Series connection of LEDS provides identical LED currents

resulting in uniform brightness without ballast resistors. The low

95mV feedback voltage minimizes power loss in the current setting

resistor can have better efficiency.

FEATURES

* Built-In Open Circuit Protection

* Built-In Over Voltage Protection

* 1.2MHz fixed switching frequency

* Low supply current: 70µA

* Matches LED current

* Requires tiny inductor and capacitors

SOT-26

1

2

3

4

5

6

*Pb-free plating product number: L5101L

ORDERING INFORMATION

Order Number

Normal

Lead Free Plating

Package

Packing

L5101-AG6-R

L5101L-AG6-R

SOT-26

Tape Reel