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L5101

UTC
Part Number L5101
Manufacturer UTC
Published Apr 12, 2007
Description WHITE LED STEP-UP CONVERTER
Detailed Description UNISONIC TECHNOLOGIES CO., LTD L5101 WHITE LED STEP-UP CONVERTER DESCRIPTION The UTC L5101 is a fixed frequency step-up ...
Datasheet PDF File L5101 PDF File

L5101
L5101


Overview
UNISONIC TECHNOLOGIES CO.
, LTD L5101 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.
LINEAR INTEGRATED CIRCUIT 6 5 4 1 2 3 SOT-26 *Pb-free plating product number: L5101L FEATURES * Built-In Open Circuit Protection * Built-In Over Voltage Protection * High Efficiency(Up to 84% at VIN=4.
2V, 3 LEDs, ILED =20mA) www.
DataSheet4U.
com * 1.
2MHz fixed switching frequency * Low supply current: 70µA * Matches LED current * Requires tiny inductor and capacitors 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 1 of 9 QW-R103-026,A L5101 PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT OVP 6 VIN 5 SW 4 1 SHDN PIN DESCRIPTIONS PIN NO.
1 2 3 4 5 6 2 GND 3 FB SYMBOL DESCRIPTION SHDN Tie to higher than 1.
5V to enable device, 0.
3V or less to disable device.
GND Reference voltage is 95mV.
Connect cathode of lowest LED and Feedback FB resistor here.
Calculation formula: RFB=95mV/ILED Connect inductor/diode here.
Minimize trace area at this pin to reduce Switch SW EMI.
Power input VIN Bypass VIN to GND with a capacitor sitting as close to VIN as possible.
Overvoltage protection OVP The internal MOSFET will turn off when VOUT >27V.
PIN NAME Shutdown Ground UNISONIC TECHNOLOGIES CO.
, LTD www.
unisonic.
com.
tw 2 of 9 QW-R103-026,A L5101 BLOCK DIAGRAM Over Voltag...


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