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UNISONIC TECHNOLOGIES CO., LTD L5109 Advance CMOS IC www.unisonic.com.tw 1 of 4 Copyright © 2015 Unisonic Technologies Co., Ltd QW-R125-038.a WHITE LED STEP-UP CONVERTER DESCRIPTION The UTC L5109 is an inductor-based DC/DC converter designed to drive up to six white LEDs in series or 2 rows of LEDs with 5 for each in parallel for backlight. Only one feedback resistor is needed to control the LED current and obtain required brightness. FEATURES * Inherently Uniform LED Current * High Efficiency up to 83.5% * No Need for External Schottky Diode * Over Output Voltage Protection * OVP * 1.2MHz Switching Frequency SOT-26 ORDERING INFORMATION Ordering Number Package Packing L5109G-AG6-R SOT-26 Tape Reel MARKING
UNISONIC TECHNOLOGIES CO., LTD 2 of 4 www.unisonic.com.tw Q W - R 1 2 5 - 0 3 8 . a PIN CONFIGURATION PIN DESCRIPTION PIN NO. PIN NAME DESCRIPTION 1 SW Switch Pin.
2 GND Ground Pin
3 FB Feedback Voltage. 4 CTRL Shutdown and Dimming Pin. 5 V OUT Output Pin. 6 V IN Input Supply Pin. BLOCK DIAGRAM EA FB 200mV VREF VIN CTRL
1.2 MHz OSC
R S Q Q1 OVP VOUT GND SS DRIVER SW PWM
UNISONIC TECHNOLOGIES CO., LTD 3 of 4 www.unisonic.com.tw Q W - R 1 2 5 - 0 3 8 . a ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Input Voltage V IN 20 V SW Voltage V SW 38 V FB Voltage V FB 20 V CTRL Voltage V CTRL 20 V Operating Junction Temperature T OPR +150 °C Storage Temperature Range T STG -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 DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient θJA 265 ° С/W Junction to Case θJC 60 ° С/W RECOMMENDED OPERATING CONDITIONS PARAMETER SYMBOL RATINGS UNIT Operating Temperature Range T OPR -40 ~ 85 °C Input Voltage V IN 2.5 ~ 16 V CTRL Voltage V CTRL 16 V ELECTRICAL CHARACTERISTICS (VIN=3V, VCTRL=3V, TA=25°C, unless otherwise specified.) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Minimum Operating Voltage V IN 2.5 16 V Feedback Voltage V FB IOUT=20mA, 4 LEDs, TA=-40°C~85°C 188 200 212 mV FB Pin Bias Current I FB 35 100 nA Supply Current I CC V FB=VIN, No Switching 2.5 3.2 mA Shutdown Quiescent Current I Q V CTRL=0V 2.0 3.2 5.0 µA Switching Frequency f 1.2 MHz Maximum Duty Cycle D MAX 90 93 % TA=25°C, D=40% 550 Switch Current Limit I LIMIT TA=25°C, D=80% 550 mA Switch VCE Saturation Voltage V CESAT I SW=250mA 360 mV Switch Leakage Current V SW=5V 0.01 5 µA High 1.8 CTRL Pin Voltage V CTRL Low 0.05 V 40 55 72 TA=85°C 50 CTRL Pin Bias Current I CTRL TA=-40°C 75 µA OVP Voltage V OV 29 V Schottky Forward Drop V DROP I D=150mA 0.7 V Reverse Voltage VR=23V 0.1 4 Schottky Leakage Current Reverse Voltage VR=27V 150 µA Soft Start Time t 300 µS
UNISONIC TECHNOLOGIES CO., LTD 4 of 4 www.unisonic.com.tw Q W - R 1 2 5 - 0 3 8 . a 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.