UNISONIC TECHNOLOGIES CO., LTD L4120 Preliminary CMOS IC 40V/1.2A INTEGRATED POWER LED DRIVER 1 DESCRIPTION The UTC L4120 is a continuous conduction mode inductive step-down converter, designed for driving single or multiple series connected LEDs. Using a few external components. The UTC L4120 has a build-in power switch, based on different input voltage, The UTC L4120 can drive several 1W or 3W LEDs. The device has the function of thermal shutdown protection and LED short-circuit/open-circuit protection. SOT-89-5 FEATURES * Up to 1.2A output current * High efficiency (up to 97%) * Wide input voltage range: 5V~30V * Typical ±5% output current accuracy * Single DIM pin on/off and brightness control using DC voltage or PWM signal * Internal thermal shutdown protection. * Adjustable Constant LED Current ORDERING INFORMATION Ordering Number L4120G-AB5-R Package SOT-89-5 Packing Tape Reel L4120G-AB5-R (1)Packing Type (1) R: Tape Reel (2)Package Type (2) AB5: SOT-89-5 (3)Green Package (3) G: Halogen Free and Lead Free MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 4 QW-R125-031.b L4120 Preliminary PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 PIN NAME LX GND ADJ ISENSE VIN CMOS IC DESCRIPTION Switch pin Ground Multi-function On/Off and brightness control pin Current sense input Input voltage BLOCK DIAGRAM + UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R125-031.b L4120 Preliminary CMOS IC ABSOLUTE MAXIMUM RATING PARAMETER RATINGS UNIT -0.3~+40 V VIN≥5V VIN+0.3~VIN-5 V ISENSE Voltage VISENSE VIN<5V VIN+0.3~ -0.3 V LX Output Voltage VLX -0.3~+40 V Adjust Pin Input Voltage VADJ -0.3~+6 V Switch Output Current ILX 1.5 A Power Dissipation PD 0.5 W Junction Temperature TJ 150 °C Operating Temperature TOP -40~105 °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. Input Voltage THERMAL DATA PARAMETER Junction to Ambient SYMBOL VIN SYMBOL θJA RATINGS 180 UNIT °C/W ELECTRICAL CHARACTERISTICS (VIN=12V, TAMB=25°C unless otherwise stated) (Note 1) PARAMETER Input Voltage Quiescent Supply Current with Output Off Quiescent Supply Current with Output Switching Mean Current Sense Threshold Voltage Sense Threshold Hysteresis External Control Voltage Range On ADJ Pin for DC Brightness Control DC Voltage On ADJ Pin to Switch Chip from Active (On) State to Quiescent (Off) State DC Voltage On ADJ Pin to Switch Chip from Quiescent (Off) State to Active (On) State Resistance Between ADJ Pin and VREF Continuous LX Switch Current LX Switch “On” Resistance LX Switch Leakage Current Minimum Switch “ON” Time Minimum Switch “OFF” Time Typical Dimming Ratio SYMBOL TEST CONDITIONS VIN IINQoff ADJ Pin Grounded IINQon MIN 6 TYP ADJ Pin Floating VSENSE VSENSEHYS UNIT V μA 1000 μA 115 ±15 VADJ 0.3 mV % 1.2 V VADJoff VADJ Falling 0.15 0.2 0.25 V VADJon VADJ Rising 0.2 0.25 0.3 V RADJ ILXmean RLX ILX(leak) TONmin LX Switch “ON” TOFFmin LX Switch “OFF” F=100Hz, VIN=15V, 1LED, Ddim L=27μH 500 1.2 0.4 1 200 200 UNISONIC TECHNOLOGIES CO., LTD KΩ A Ω μA ns ns 1200:1 Recommended Maximum Operating fLXmax Frequency Recommended Duty Cycle Range of Output DLX 0.3 Switch at fLXmax Internal Comparator Propagation Delay TPD Thermal Shutdown Temperature TSD Thermal Shutdown Hysteresis TSD-HYS Note: Production testing of the chip is performed at 25°C. Functional operation of the chip and are guaranteed by design, characterization and process control in other temperature. www.unisonic.com.tw MAX 40 400 1 0.7 MHz 0.9 50 ns 150 °C 20 °C parameters specified 3 of 4 QW-R125-031.b L4120 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT 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-R125-031.b