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SC441ATETRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC441ATETRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 20 page  High Efficiency Integrated Driver for 4-Strings of 150mA LEDs SC441A POWER MANAGEMENT July 23, 2009 www.semtech.com Features Applications Description Wide input voltage range from 4.5V to 2V 36V maximum output voltage Drives up to 40 WLEDs in 4 strings Programmable LED current for up to 150mA per string +/- 2% string-to-string current matching Up to 90% efficiency Wide 0.2% to 00% PWM dimming range Possible analog dimming Integrated 2.5A power switch 700KHz switching frequency for small size Adjustable OVP for cost-effective output cap selection Open/short LED protection Thermal protection with auto-recovery Thermally enhanced TSSOP-20 EDP package Fully WEEE and RoHS compliant Medium-sized LCD panel Notebook Display Automotive Car Navigation Display Sub-Notebook and Tablet Computer Displays Portable Media Players The SC44A is a high-efficiency multiple string WLED driv- er with an integrated boost converter. It operates over a wide input range from 4.5V to 2V with a maximum out- put voltage of 36V and a 2.5A internal power switch. It can drive up to forty WLEDs in 4 strings with current up to 50mA per string. The string-to-string current match- ing is 2% typical, 3% maximum. The overall efficiency is greater than 90% due to the low current sense voltage and a low-impedance internal power switch. The wide PWM dimming range boasts a ratio of 500: . The 700KHz switching frequency enables the user to op- timize the external component sizes for efficiency. When there are fewer than 0 LEDs in each string, users can ad- just the output voltage protection yielding an allowable reduction in associated costs, size and voltage ratings of the output capacitor. The SC44A also features comprehensive open and short- circuit LED protection functions. It disables the corre- sponding strings with LED open or LED short conditions while maintaining normal operation of other, unaffected LED strings. This feature allows LCD panels to remain view- able even under LED failure, wire disconnect, or short-cir- cuit conditions. The internal thermal shutdown protects the IC from overheating at abnormal conditions. The SC44A is available in a thermally-enhanced TSSOP- 20 EDP package. Typical Application Circuit 1 4 VOUT SS PGND IOSET IO1-4 COMP OVPIN AGND VIN SW PWM EN OVPRTN SW FFLAG PGND IOGND SC441A 4 Strings 1 10 Vin (4.5V -21V) 2 EDP PGND IOSET IO1- 4 COMP SS AGND VOUT OVPIN |
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