Addressing the migration of white LEDs to lower forward voltages, the four-channel CAT4004 low-dropout driver (LDD) drives LEDs directly from a battery. The part offers a dropout voltage of 130 mV, a shutdown current of less than 1 µA, and a tight current matching of ±5% across a wide range of LED voltages.
It also offers LED programming simplicity via a one-wire EZDim interface, which allows output enable/disable and LED dimming control all from a single I/O on the system microcontroller. Housed in 8-lead TDFN packages, its LED current can be controlled at six levels: 100% (full-scale brightness), 50%, 25%, 12.5%, 6%, and 3%. ($0.52 ea/10,0006 to 8 weeks ARO.)
Catalyst Semiconductor , Santa Clara , CA
Information 408-542-1000
http://www.catsemi.com
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