SC441 - Semtech Corporation

SC441 High Effi ciency Integrated Driver

The SC441 is a high-efficiency multiple string WLED driver with an integrated boost converter. It operates over a wide input range from 4.5V to 21V with a maximum output voltage of 36V and a 2.5A internal power switch. It can drive up to forty WLEDs in 4 strings with current up to 150mA per string. The string-to-string current matching is 2% typical, 3% maxi.

Features

Wide input voltage range from 4.5V to 21V „ 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 100% PWM dimming range www.DataSheet4U.com „ Possible analog dimming „ Integrated 2.5A power switch „ 800kHz 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 „ Description.