Linear Technology Corp. (Milpitas, CA) announced its new LT1937 white LED driver, which drives up to four white LEDs and operates at 84 percent efficiency while providing a shutdown current of <1µA, allowing the IC to be used in hand-held applications.
Packaged in an SC-70 or TSOT package, the LT1937 operates from 2.5V to 5.5V and offers a 1.2MHz switching frequency that allows the use of a 22µH inductor and 0.22µF output capacitor to complete a small footprint LED driver circuit. The feedback voltage of 95mV contributes to high efficiency and provides good brightness control even when partially dimmed to current levels of 6mA to 8mA.
