L5100

L5100 UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., L5100 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 Copyright © 2005 Unisonic Technologies Co., QW-R103-024,A 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 0.22µ F , 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 SOT-25 SOT-363 *Pb-free plating product number: L5100L „ ORDERING INFORMATION Ordering Number Normal Lead Free Plating Package Packing L5100-AF5-R L5100L-AF5-R SOT-25 Tape Reel L5100-AN3-R L5100L-AN3-R SOT-363 Tape Reel

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ PIN DESCRIPTION PIN NO. SOT-25 SOT-363 PIN NAME SYMBOL FUNCTION 1 1 Switch SW Connect inductor/diode here. Minimize trace area at this pin to reduce EMI. 2 2/5 Ground GND Connect directly to local ground plane. 3 3 Feedback FB Reference voltage is 95mV. Connect cathode of lowest LED and resistor here. Calculate resistor value according to the formula: RFB = 95mV/ILED 4 4 Shutdown SHDN Connect to 1.5V or higher to enable device; 0.4V or less to disable device. 5 6 Input Supply V IN Input Supply Pin. Must be locally bypassed. „ BLOCK DIAGRAM VREF 1.25V 3 1 95mV VIN FB Pin 5 (SOT-25) Pin 6 (SOT-363) + A1 - Rc Cc Σ RAMP GENERATOR 1. 2MHz TIME CONTROL R S Q DRIVER SW GND Pin 2/5 (SOT-363) Pin 2 (SOT-25) 0. 2Ω SHUTDOWN Slope compensation SHDN

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN 12 V Switch Voltage V SW 36 V Feedback Voltage V FB 12 V Shutdown Voltage V SHDN 12 V Operating Temperature T OPR 0 ~ +70 ℃ Junction Temperature T J +125 ℃ Storage Temperature T STG -40 ~ +150 ℃ „ ELECTRICAL CHARACTERISTICS (Ta=25℃, VIN=3V, VSHDN=3V, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Voltage V IN 2.5 12 V Feedback Voltage V FB I SW=100mA, Duty Cycle=66% 87 95 104 mV Shutdown Voltage ON V ON 1.5 V Shutdown Voltage OFF V OFF 0.3 V Switch VCESAT V CESAT(SW) I SW=250mA 360 mV Switch Current Limit I SW 320 mA Supply current Icc SHDN=0V 1.8 0.1 2.5 1.0 mA µA Switch Leakage Current I SW(OFF) V SW=5V 0.01 5 µA Shutdown Pin Bias Current I SHDN 60 µA Feedback Pin Bias Current I FB 10 45 100 nA Switching Frequency f OSC 0.8 1.2 1.6 MHz Maximum Duty Cycle DC 85 90 %

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ TYPICAL APPLICATION CIRCUIT VIN SW SHDN FB GND R1 COUT 0.22μF CIN 1μF VIN 3V ~ 5V L 22μH D 90k VDC DIMMING Li-Ion to Two White LEDs LED CURRENT (mA) 100 3020 Two LED Efficiency EFFICIENCY(%) VIN=3V VIN=3.6V Li-Ion to Three White LEDs LED CURRENT (mA) 1510 Three LED Efficiency EFFICIENCY (%) VIN=3V VIN=3. 6V VIN SW SHDN FB GND R1 6.34Ω 15mA COUT 0.22μF CIN 1μF VIN 3V ~ 5V L 22μF D VDC DIMMING 90k

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ TYPICAL APPLICATION CIRCUIT (cont.) VIN SW SHDN FB GND R1 C OUT 0. 22 µF C IN 1 µF VIN 3V ~ 5V L 22 µH D 90 k VDC DIMMING Li- Ion to Four White LEDs LOAD CURRENT (mA) Four LED Efficiency EF FICI EN CY (%) VIN=3V VIN =3 .6 V LOAD CURRENT (mA) 1210 Five LED Efficiency EFFICIENCY(%) VIN=3V 862 VIN=3.6V VIN SW SHDN FB GND R1 COUT 0.22μF CIN 1μF VIN 3V ~ 5V L 22μH D 90k VDC DIMMING Li-Ion to Five White LEDs

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ TYPICAL APPLICATION CIRCUIT (cont.) LOAD CURRENT ( mA) Seven LED Efficiency EFFICIENCY (%) VIN SW SHDN FB GND R1 C OUT 0. 22 µF C IN 1µF V IN L 22µ H D 90 k VDC DIMMING 5V to Seven White LEDs

L5100 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 www.unisonic.com.tw Q W - R 1 0 3 - 0 2 4 , A „ TYPICAL CHARACTERISTICS 2.2 VIN (V) 0.8 0. 4 1.2 1.6 2.0 Quiescent Current IQ (mA) 25℃ 80℃ 1.8 1.4 1.0 0.6 0.2 350 200 6040 100 200 300 250 150 80 100 Current Limit vs Duty Cycle DUTY CYCLE (%) CURRENT LIMIT (mA) * UTC L5100 is guaranteed the operating temperature range of 0℃ ~7 5℃. 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.