UNISONIC TECHNOLOGIES CO., L5100 LINEAR INTEGRATED CIRCUIT WHITE LED STEP-UP CONVERTER 2 1 3 5 DESCRIPTION 4 SOT-25 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 allowing 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 1 SOT-363 *Pb-free plating product number: L5100L * 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 Normal Lead Free Plating L5100-AF5-R L5100L-AF5-R L5100-AN3-R L5100L-AN3-R www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Package Packing SOT-25 SOT-363 Tape Reel Tape Reel 1 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT PIN DESCRIPTION PIN NO. SOT-25 SOT-363 PIN NAME 1 1 Switch 2 2/5 Ground 3 3 Feedback 4 4 Shutdown 5 6 Input Supply SYMBOL FUNCTION Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. GND Connect directly to local ground plane. Reference voltage is 95mV. Connect cathode of lowest LED and FB resistor here. Calculate resistor value according to the formula: RFB = 95mV/ILED SHDN Connect to 1.5V or higher to enable device; 0.4V or less to disable device. VIN Input Supply Pin. Must be locally bypassed. SW BLOCK DIAGRAM VIN Pin 5 (SOT-25) Pin 6 (SOT-363 ) 5 VREF 1.25V FB SW 3 1 95mV A1 + DRIVER A2 + Rc R S Q Q1 Cc Σ RAMP GENERATOR 1 .2MHz TIME CONTROL + SHUTDOWN SHDN Slope compensation 4 0 .2Ω 2 GND Pin 2 /5 (SOT-363 ) Pin 2 (SOT-25 ) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS PARAMETER Input Voltage Switch Voltage Feedback Voltage Shutdown Voltage Operating Temperature Junction Temperature Storage Temperature SYMBOL VIN VSW VFB VSHDN TOPR TJ TSTG RATINGS 12 36 12 12 0 ~ +70 +125 -40 ~ +150 UNIT V V V V ℃ ℃ ℃ ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3V, VSHDN=3V, unless otherwise specified.) PARAMETER Operating Voltage Feedback Voltage Shutdown Voltage ON Shutdown Voltage OFF Switch VCESAT Switch Current Limit SYMBOL VIN VFB VON VOFF VCESAT(SW) ISW Supply current Switch Leakage Current Shutdown Pin Bias Current Feedback Pin Bias Current Switching Frequency Maximum Duty Cycle Icc ISW(OFF) ISHDN IFB fOSC DC TEST CONDITIONS ISW =100mA, Duty Cycle=66% TYP 95 MAX 12 104 0.3 ISW =250mA SHDN=0V VSW =5V UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 2.5 87 1.5 10 0.8 85 360 320 1.8 0.1 0.01 60 45 1.2 90 2.5 1.0 5 100 1.6 UNIT V mV V V mV mA mA µA µA µA nA MHz % 3 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT Two LED Efficiency 86 L 22μH CIN 1μF SW SHDN FB 82 COUT 0.22μF VDC DIMMING VIN VIN=3.6V 84 D 90k 5k R1 2Ω GND VIN=3V EFFICIENCY(%) VIN 3V ~ 5V 80 78 76 74 72 Li-Ion to Two White LEDs 70 0 VDC DIMMING 15mA 90k FB GND 85 COUT 0.22μF SW SHDN 40 D CIN 1μF VIN 30 20 LED CURRENT (mA) Three LED Efficiency 90 L 22μF 5k R1 6.34Ω Li-Ion to Three White LEDs EFFICIENCY (%) VIN 3V ~ 5V 10 80 VIN=3V 70 65 60 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw VIN=3.6V 75 0 5 10 15 LED CURRENT (mA) 20 4 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT (cont.) Four LED Efficiency 85 D C IN 1 µF VDC DIMMING VIN SW 90 k 5k FB SHDN C OUT 0 . 22 µ F R1 4Ω GND 80 E FFICIE NCY (% ) VIN 3V ~ 5V L 22 µH VIN=3V VIN =3 .6 V 75 70 Li- Ion to Four White LEDs 65 0 5 10 20 15 LOAD CURRENT (mA) Five LED Efficiency 85 L 22μH CIN 1μF COUT 0.22μF VDC DIMMING VIN SW 90k 5k SHDN FB GND R1 4Ω 80 EFFICIENCY(%) VIN 3V ~ 5V D VIN=3V 75 VIN=3.6V 70 Li-Ion to Five White LEDs 65 0 2 4 6 8 10 12 LOAD CURRENT (mA) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT TYPICAL APPLICATION CIRCUIT (cont.) Seven LED Efficiency 85 L 22 µ H D C IN 1µ F VDC DIMMING V IN C OUT 0. 22 µ F SW 90 k 5k SHDN FB GND R1 4Ω 80 EFFICIENCY (%) V IN 5V 75 70 5 V to Seven White LEDs 65 0 5 LOAD CURRENT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1 5 1 0 (mA ) 6 QW-R103-024,A L5100 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS Quiescent Current Current Limit vs Duty Cycle 350 2 .2 25℃ 2 .0 300 1 .8 80℃ CURRENT LIMIT (mA) 1 .6 IQ (mA) 1 .4 1 .2 1 .0 0 .8 0 .6 0 .4 250 200 150 100 50 0 .2 0 0 0 2 4 6 8 10 VIN ( V ) 0 20 40 60 80 100 DUTY CYCLE (%) * UTC L5100 is guaranteed the operating temperature range of 0℃ ~ 75℃. 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 7 QW-R103-024,A