UNISONIC TECHNOLOGIES CO., LTD UC3501 Preliminary CMOS IC HIGH EFFICIENT, LOW COST FLASHLIGHT LED DRIVE DESCRIPTION UTC UC3501 is Flashlight ASIC chip, Using LSI technology, Specifically designed for single dry battery, Plus 1 of inductors, May constitute a drive circuit for LED flashlights. FEATURES * High efficiency:85%~90% * Low cost * Simply add-ins one inductor ORDERING INFORMATION Order Number Lead Free Halogen Free UC3501L-T92-B UC3501G-T92-B UC3501L-T92-K UC3501G-T92-K Note: Pin Assignment: G: GND D: VDD O: OUT Package TO-92 TO-92 Pin Assignment 1 2 3 O D G O D G Packing Tape Box Bulk MARKING INFORMATION PACKAGE TO-92 MARKING UTC UC3501 L: Lead Free G: Halogen Free Data Code 1 www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd 1 of 4 QW-R502-A63.b UC3501 Preliminary CMOS IC BLOCK DIAGRAM VDD VOUT OSCILLATOR ERROR AMPLIFIER VFM CONTROL VREF VIX LIMITER GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R502-A63.b UC3501 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN 6 V Output Current IOUT 150 mA Operating Junction Temperature TJ -40~85 °C Storage Temperature TSTG -55~150 °C Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (TA=25°C) PARAMETER Supply Voltage Start Voltage Output Current Oscillator Frequency Efficiency SYMBOL VDD VSTART IOUT FOSC η UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TEST CONDITIONS MIN 0.9 TYP 0.9 100 100 85 MAX 5.0 UNIT V V mA KHz % 3 of 4 QW-R502-A63.b UC3501 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT 2 47µH UTC UC3501 VOUT 1 VIN GND 3 L1 LED L2 LED R1 10 L3 LED R2 10 R3 10 UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 4 QW-R502-A63.b