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L5100 Dataheets PDF



Part Number L5100
Manufacturers UTC
Logo UTC
Description WHITE LED STEP-UP CONVERTER
Datasheet L5100 DatasheetL5100 Datasheet (PDF)

UNISONIC TECHNOLOGIES CO., LTD L5100 LINEAR INTEGRATED CIRCUIT WHITE LED STEP-UP CONVERTER  DESCRIPTION The UTC L5100 is a STEP-UP DC/DC Converter and designed for driving white LEDs with a constant current. It can drive several LEDs in series by a Li-Ion cell. UTC L5100 switches at a high frequency 1.2MHz, so it can allow the use of tiny external components. The output capacitor can be as small as 0.22μF; saving space and cost compare with alternative other solutions. The low 95mV feedbac.

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UNISONIC TECHNOLOGIES CO., LTD L5100 LINEAR INTEGRATED CIRCUIT WHITE LED STEP-UP CONVERTER  DESCRIPTION The UTC L5100 is a STEP-UP DC/DC Converter and designed for driving white LEDs with a constant current. It can drive several LEDs in series by a Li-Ion cell. UTC L5100 switches at a high frequency 1.2MHz, so it can allow the use of tiny external components. The output capacitor can be as small as 0.22μF; saving space and cost compare with alternative other solutions. The low 95mV feedback voltage minimizes power loss in the current setting resistor can have better efficiency.  FEATURES * Inherently Matched LED Current * High Efficiency: 83% Typical * Drives Up to Four LEDs from a 3.2V Supply * Drives Up to Six LEDs from a 5V Supply * 36V Rugged Bipolar Switch * 1.2MHz Switching Frequency * Uses Tiny 1mm Tall Inductors * Output Capacitor can be Small to only 0.22μF  ORDERING INFORMATION Ordering Number L5100G-AF5-R Package SOT-25 Packing Tape Reel  MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 6 QW-R103-024.F L5100  PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT  PIN DESCRIPTION PIN NO. 1 2 3 4 5 PIN NAME SW GND FB SHDN VIN DESCRIPTION Switch. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. Ground. Connect directly to local ground plane. Feedback. Reference voltage is 95mV. Connect cathode of lowest LED and resistor here. Calculate resistor value according to the formula: RFB = 95mV/ILED Shutdown. Connect to 1.5V or higher to enable device; 0.4V or less to disable device. Input Supply Pin. Must be locally bypassed.  BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 6 QW-R103-024.F L5100 LINEAR INTEGRATED CIRCUIT  ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Input Voltage Switch Voltage VIN 12 V VSW 36 V Feedback Voltage Shutdown Voltage VFB VSHDN 12 12 V V Junction Temperature Operating Junction Temperature TJ +125 °C TJ -40~+85 °C Storage Temperature Range TSTG -65~+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.  THERMAL RESISTANCES CHARACTERISTICS PARAMETER Junction to Ambient (in free air) SYMBOL θJA RATINGS 256 UNIT °C/W  ELECTRICAL CHARACTERISTICS (TA=25°C, VIN=3V, VSHDN =3V, unless otherwise specified.) PARAMETER Operating Voltage Feedback Voltage Shutdown Voltage ON Shutdown Voltage OFF Switch VCESAT Switch Current Limit Supply current Switch Leakage Current Shutdown Pin Bias Current Feedback Pin Bias Current Switching Frequency Maximum Duty Cycle SYMBOL VIN VFB VON VOFF VCESAT(SW) ISW ICC ISW(OFF) ISHDN IFB fOSC DC TEST CONDITIONS ISW=100mA, Duty Cycle=66% ISW=250mA SHDN =0V VSW=5V MIN TYP MAX UNIT 2.5 12 V 87 95 104 mV 1.5 V 0.3 V 360 mV 320 mA 1.8 2.5 mA 0.1 1.0 µA 0.01 5 µA 60 µA 10 45 100 nA 0.8 1.2 1.6 MHz 85 90 % UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 6 QW-R103-024.F L5100  TYPICAL APPLICATION CIRCUITS LINEAR INTEGRATED CIRCUIT EFFICIENCY(%) EFFICIENCY (%) EFFICIENCY (%) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 6 QW-R103-024.F L5100  TYPICAL APPLICATION CIRCUITS (Cont.) VIN 3V ~ 5V CIN 1μF L=22μH D VDC DIMMING COUT 0.22μF VIN SW SHDN FB GND 90k 5k R1 4Ω LINEAR INTEGRATED CIRCUIT Five LED Efficiency 85 80 VIN=3V 75 VIN=3.6V 70 Li - Ion to Five White LEDs V IN 5V C IN 1µF L=22μH D VDC DIMMING VIN SW SHDN FB GND 90 k 5k R1 4Ω 65 0 85 2 4 6 8 10 12 LOAD CURRENT (mA) Six LED Efficiency C OUT 0. 22µF 80 75 70 5 V to Six White LEDs 65 0 5 1 0 LOAD CURRENT (mA) 1 5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 6 QW-R103-024.F IQ (mA) CURRENT LIMIT (mA) L5100  TYPICAL CHARACTERISTICS Quiescent Current 2 .2 2.0 25°C 1.8 80°C 1.6 1 .4 1.2 1 .0 0.8 0 .6 0 .4 0 .2 0 0 2 4 6 8 10 VIN (V) * UTC L5100 is guaranteed the operating temperature range of 0°C ~ 75°C. LINEAR INTEGRATED CIRCUIT 350 300 250 200 150 100 50 0 0 Current Limit vs Duty Cycle 20 40 60 80 DUTY CYCLE (%) 100 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 .


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