SC441ATETRT Semtech

SC441A High Efficiency Integrated Driver for 4-Strings of 150mA LEDs POWER MANAGEMENT Features Description Wide input voltage range from 4.5V to 21V The SC441A is a high-efficiency multiple string WLED driv - er with an integrated boost converter. It operates over a 36V maximum output voltage wide input range from 4.5V to 21V with a maximum out- Drives up to 40 WLEDs in 4 strings put voltage of 36V and a 3.0A internal power switch. It Programmable LED current for up to 150mA per can drive up to forty WLEDs in 4 strings with current up string to 150mA per string. The string-to-string current match- +/- 2% string-to-string current matching ing is 2% typical, 3% maximum. The overall efficiency is Up to 90% efficiency greater than 90% due to the low current sense voltage Wide 0.2% to 100% PWM dimming range and a low-impedance internal power switch. The wide Possible analog dimming PWM dimming range boasts a ratio of 500: 1. Integrated 3.0A power switch 700KHz switching frequency for small size The 700KHz switching frequency enables the user to op- Adjustable OVP for cost-eeff ctive output cap selection timize the external component sizes for efficiency. When Open/short LED protection there are fewer than 10 LEDs in each string, users can ad- Thermal protection with auto-recovery just the output voltage protection yielding an allowable reduction in associated costs, size and voltage ratings of Thermally enhanced TSSOP-20 EDP package the output capacitor. Fully WEEE and RoHS compliant AEC-Q100 Grade 3 qualified The SC441A also features comprehensive open and short- circuit LED protection functions. It disables the corre- Applications sponding strings with LED open or LED short conditions while maintaining normal operation of other, unaffected Medium-sized LCD panel LED strings. This feature allows LCD panels to remain view- Notebook Display able even under LED failure, wire disconnect, or short-cir- Automotive Car Navigation Display cuit conditions. The internal thermal shutdown protects Sub-Notebook and Tablet Computer Displays the IC from overheating at abnormal conditions. Portable Media Players The SC441A is available in a thermally-enhanced TSSOP- 20 EDP package. Typical Application Circuit Vin (4.5V -21V) 1 2 SW SW VIN VVOOUUTT 4 Strings EN OVPIN OVPIN FFLAG OVPRTN PWM 10 SC441A 4 IO1-4 IO1- 4 CCOOMMPP IIOOSSEETT AGND AGND IOGND SS SS EDP PPGGNNDD PGND www.semtech.com January 18, 2010 1 1X-ON Electronics Largest Supplier of Electrical and Electronic Components Click to view similar products for LED Lighting Drivers category: Click to view products by Semtech manufacturer: Other Similar products are found below : LV5235V-MPB-H MB39C602PNF-G-JNEFE1 FAN5702UMP30X MIC2871YMK-T5 MP1518DJ-LF-P MP3202DG-LF-P MP3304BDD- LF-P MP3306EG-LF-P MP3398AGY MP4033GK AL1676-10BS7-13 AL1676-20AS7-13 MX877RTR NCL30085BDR2G ICL8201 IS31BL3506B-TTLS2-TR PAM2841GR A8519KLPTR-T FAN5702UMP20X AL3157F-7 AL8807BQMP-13 LV52204MTTBG TLD1120EL MP2488DN-LF MP24893DQ-LF-P MP24894GJ-P MP24895GJ-P MP3308DL-LF-Z MP3393EF-LF MP3394SGF MP3802DQ-LF-P MP4008GS MP4031GS MP4032-1GS MP4034GS MP46885DN-LF SLG7NT4082V SLG7NT4082VTR PCA9955BTWQ900J TLD5095EL LED6001TR STP4CMPQTR BD1604MVV-E2 MAX16832CASAT MAX16814CATP+ NCL30086BDR2G NCL30088BDR2G IS31LT3350-V1SDLS2-EB3CH MP3202DJ-LF-P MP24833GN