UNISONIC TECHNOLOGIES CO., LTD L5109 Advance CMOS IC 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. 6 5 4 1 2 3 SOT-26 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 ORDERING INFORMATION Ordering Number L5109G-AG6-R Package SOT-26 Packing Tape Reel MARKING www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 4 QW-R125-038.a L5109 Advance PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 PIN NAME SW GND FB CTRL VOUT VIN CMOS IC DESCRIPTION Switch Pin. Ground Pin Feedback Voltage. Shutdown and Dimming Pin. Output Pin. Input Supply Pin. BLOCK DIAGRAM FB SW 3 1 5 VOUT SS 6 VIN VREF 200mV OVP + DRIVER - EA + PWM + R Q1 Q S COMPARATOR ∑ + 4 2 GND CTRL RAMP GENERATOR 1.2 MHz OSC UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 4 QW-R125-038.a L5109 Advance CMOS IC ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT Input Voltage VIN 20 V SW Voltage VSW 38 V FB Voltage VFB 20 V CTRL Voltage VCTRL 20 V Operating Junction Temperature TOPR +150 °C Storage Temperature Range TSTG -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 Junction to Ambient Junction to Case SYMBOL θJA θJC UNIT °С/W °С/W RATINGS -40 ~ 85 2.5 ~ 16 16 UNIT °C V V RECOMMENDED OPERATING CONDITIONS PARAMETER Operating Temperature Range Input Voltage CTRL Voltage RATINGS 265 60 SYMBOL TOPR VIN VCTRL ELECTRICAL CHARACTERISTICS (VIN=3V, VCTRL=3V, TA=25°C, unless otherwise specified.) PARAMETER Minimum Operating Voltage Feedback Voltage FB Pin Bias Current Supply Current Shutdown Quiescent Current Switching Frequency Maximum Duty Cycle Switch Current Limit SYMBOL VIN VFB IFB ICC IQ f DMAX ILIMIT Switch VCE Saturation Voltage Switch Leakage Current VCESAT CTRL Pin Voltage VCTRL CTRL Pin Bias Current ICTRL OVP Voltage Schottky Forward Drop VOV VDROP TEST CONDITIONS IOUT=20mA, 4 LEDs, TA=-40°C~85°C VFB=VIN, No Switching VCTRL=0V MIN 2.5 TYP MAX 16 UNIT V 188 200 212 mV 35 2.5 3.2 1.2 93 550 550 360 0.01 100 3.2 5.0 nA mA µA MHz % 2.0 90 TA=25°C, D=40% TA=25°C, D=80% ISW=250mA VSW=5V High Low Schottky Leakage Current Soft Start Time ID=150mA Reverse Voltage VR=23V Reverse Voltage VR=27V t UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 1.8 40 TA=85°C TA=-40°C mA 55 50 75 29 0.7 0.1 300 0.05 72 mV µA V µA V V 4 150 µA µS 3 of 4 QW-R125-038.a L5109 Advance 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-R125-038.a