Boost Device Drives up to 120 White LEDs
Tue, 08/17/2010 - 8:07am
Semtech Corp. announced the SC442, a 10-channel white LED driver with an integrated 3A boost power switch. The device is capable of driving up to 120 LEDs at up to 30 mA per channel and is packaged in a low-profile 4 mm x 4 mm x0.6 mm, 28-pin MLPQ package. The SC442 operates across a wide input voltage range of 4.5 V to 21 V for use with lithium ion battery packs or regulated 5 V, 12 V or 18 V power supplies. It is capable of up to 42 V output for driving up to 12 white LEDs per channel. The device is compatible with boost (step-up), or SEPIC (step-up/down) topologies. It also transitions seamlessly to bypass (or linear) mode; when the input voltage is greater than the output voltage. The synchronization feature eliminates inter-modulation noise found in backlight systems using multiple driver ICs – such as those found in large LED backlit LCD-TVs. Other features include over-temperature, overload, open and programmable short LED protection.