White LED Step-Up Converter from Semtech Integrates Schottky Diode for a Tiny Total Solution
Semtech Corp has announced the SC4509, the newest product addition to its handheld power management portfolio. The SC4509 is a step-up converter for white LED backlight applications with an integrated Schottky diode in a 2 x 2 x 0.8mm package. The SC4509 can drive up to five white LEDs in series to provide a tiny solution for small LCD displays. The device’s built-in Schottky diode saves board space and reduces costs while still providing efficiencies of over 80%, which is better than most competitive devices with integrated Schottky and similar to many that require an external Schottky.To s
The SC4509 features extensive protection capabilities including over-voltage protection, current limit, thermal shutdown and open LED protection.
The input voltage range for the SC4509 is 2.7V to 10V, and the device can output up to 20V at 30mA. The device operates with a 1.2 MHz constant switching frequency. The SC4509 is available in either an MLPD-8 or SOT-23 package, both of which are RoHS compliant. Both packages assure a small overall footprint and cost effective solution.
“The SC4509 is one of the smallest LED boost converters on the market, and it integrates the Schottky diode while still delivering the efficiency one usually associates with larger solutions,” said Karl Volk, Director of Marketing for Handheld Power. “In portables with small displays where size and battery life are priorities, the SC4509 offers a compact layout and simple interface to ease the design-in process.”