L5100-AN3-R

UNISONIC TECHNOLOGIES CO., L5100 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 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. LINEAR INTEGRATED CIRCUIT 2 3 1 5 4 SOT-25 1 SOT-363 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 *Pb-free plating product number: L5100L ORDERING INFORMATION Ordering Number Normal Lead Free Plating L5100-AF5-R L5100L-AF5-R L5100-AN3-R L5100L-AN3-R Package SOT-25 SOT-363 Packing Tape Reel Tape Reel www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., 1 QW-R103-024,A L5100 PIN DESCRIPTION PIN NO. SOT-25 SOT-363 1 2 3 4 5 1 2/5 3 4 6 PIN NAME Switch Ground Feedback Shutdown Input Supply SYMBOL SW LINEAR INTEGRATED CIRCUIT 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. BLOCK DIAGRAM VIN Pin 5 (SOT-25) Pin 6 (SOT-363 ) 5 FB 3 SW 1 VREF 1.25V 95mV A1 + Rc Cc A2 + DRIVER R S Q Q1 Σ RAMP GENERATOR 1 .2MHz TIME CONTROL + SHUTDOWN 4 0 .2Ω Slope compensation 2 GND SHDN Pin 2 /5 (SOT-363 ) Pin 2 (SOT-25 ) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 QW-R103-024,A L5100 ABSOLUTE MAXIMUM RATINGS PARAMETER Input Voltage Switch Voltage Feedback Voltage Shutdown Voltage Operating Temperature Junction Temperature Storage Temperature LINEAR INTEGRATED CIRCUIT 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 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% MIN 2.5 87 1.5 TYP 95 MAX 12 104 0.3 ISW =250mA SHDN=0V VSW =5V 10 0.8 85 360 320 1.8 0.1 0.01 60 45 1.2 90 UNIT V mV V V mV mA mA µA µA µA nA MHz % 2.5 1.0 5 100 1.6 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 QW-R103-024,A L5100 TYPICAL APPLICATION CIRCUIT LINEAR INTEGRATED CIRCUIT 86 L 22μH VIN 3V ~ 5V CIN 1μF VIN 84 COUT 0.22μF 82 Two LED Efficiency VIN=3.6V D VDC DIMMING SW 90k 5k R1 2Ω VIN=3V EFFICIENCY(%) 80 78 76 74 72 SHDN GND FB Li-Ion to Two White LEDs 70 0 10 30 20 LED CURRENT (mA) 40 VIN 3V ~ 5V L 22μF CIN 1μF VIN SW 90 D VDC DIMMING 15mA Three LED Efficiency COUT 0.22μF 85 EFFICIENCY (%) 80 VIN=3V 75 VIN=3.6V 90k SHDN GND FB 5k R1 6.34Ω 70 Li-Ion to Three White LEDs 65 60 0 5 10 15 LED CURRENT (mA) 20 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 QW-R103-024,A L5100 TYPICAL APPLICATION CIRCUIT (cont.) LINEAR INTEGRATED CIRCUIT Four LED Efficiency 85 L 22 µH C IN 1 µF VIN SW D VDC DIMMING 90 k 5k R1 4Ω C OUT 0 . 22 µ F 80 VIN 3V ~ 5V E FFICIE NCY (% ) VIN=3V VIN =3 .6 V 75 SHDN GND FB 70 Li- Ion to Four White LEDs 65 0 5 10 LOAD CURRENT (mA) 15 20 Five LED Efficiency L 22μH VIN 3V ~ 5V CIN 1μF VIN 85 D COUT 0.22μF EFFICIENCY(%) VDC DIMMING SW 90k 5k SHDN GND FB R1 4Ω 80 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 TYPICAL APPLICATION CIRCUIT (cont.) 85 L 22 µ H C IN 1µ F V IN SW 90 k 5k SHDN GND FB R1 4Ω D 80 EFFICIENCY (%) LINEAR INTEGRATED CIRCUIT Seven LED Efficiency V IN 5V VDC DIMMING C OUT 0. 22 µ F 75 70 5 V to Seven White LEDs 65 0 5 LOAD CURRENT 1 0 (mA ) 1 5 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 QW-R103-024,A L5100 TYPICAL CHARACTERISTICS Quiescent Current 2 .2 2 .0 1 .8 1 .6 1 .4 IQ (mA) LINEAR INTEGRATED CIRCUIT Current Limit vs Duty Cycle 350 25℃ 300 80℃ CURRENT LIMIT (mA) 250 200 150 100 50 0 1 .2 1 .0 0 .8 0 .6 0 .4 0 .2 0 0 2 4 VIN ( V ) 6 8 10 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