Catalyst Semiconductor’s CAT4004 is a four-channel low dropout driver (LDD) designed for portable applications where the LEDs are driven directly from the battery. The CAT4004’s dropout voltage of 130 mV supports this trend.
The CAT4004 LDD features current matching of ±5% percent 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. LED current can be controlled at six levels: 100%, 50%, 25%, 12.5%, 6% and 3%. The CAT4004 is priced at $0.52 each in 10,000-piece quantities. Samples are available now.