Introducing two integrated, multi-string white LED drivers, the SC440 and SC441, that give notebook computer and LCD panel manufacturers a compact, high efficiency solution for powering display backlight applications.
The SC440 can power up to six strings of 30mA WLEDs in series and is ideal for notebook computer and other displays that measure up to 15-inches. The SC441 powers up to four strings of 150mA WLEDs in series and is designed for smaller and brighter display applications such as automobile navigation screens or others measuring up to about 9-inches. The devices feature 91% efficiency at maximum load for improved thermal conditions and longer battery life in portable applications. Screen brightness is kept uniform through an active current matching capability that delivers an industry best 1% (typical) current variation across all strings. Both devices also feature a wide 4.5V to 21V input range to meet voltage levels of portable devices. "The SC440 and SC441 provide one of the highest efficiency, integrated power solutions for display makers that want to turn to LEDs for a mercury-free backlight capability,” said Ramesh Balasubramaniam, Semtech Marketing Manager, Display Power. “These devices lead the market in efficiency and current matching capability to provide an excellent screen image, and are small enough and flexible enough for all medium and high brightness applications."
The SC440 is housed in a 4mm x 4mm MLPQ-24 (QFN-24) and the SC441 is available in a TSSOP20. Both packages feature an exposed thermal pad to allow for high temperature and high power applications and both are lead-free and WEEE/RoHS compliant.
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