L5101 Datasheet, PDF (1/9 Pages) Unisonic Technologies – WHITE LED STEP-UP CONVERTER

UNISONIC TECHNOLOGIES CO., LTD
L5101
LINEAR INTEGRATED CIRCUIT

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
* High Efficiency(Up to 84% at V_IN=4.2V, 3 LEDs, I_LED=20mA)
* 1.2MHz fixed switching frequency
* Low supply current: 70µA
* Matches LED current
* Requires tiny inductor and capacitors
4
5
6
3
2
1
SOT-26
*Pb-free plating product number: L5101L
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
L5101-AG6-R
L5101L-AG6-R
Package
SOT-26
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
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