Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2
The Semtech SC4509 is a highly integrated step-up DC/DC converter targeted for white LED backlighting applications. It is designed to drive up to five LEDs with a wide input voltage range of 2.7 to 10 volts. Designed for an output voltage up to 20V, the SC4509 operates with a constant 1.2MHz PWM frequency.
More info at Semtech's site: http://www.semtech.com/products/sc4509/
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