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Optoelectronics/Displays??

Low-dropout LED driver targets power-conscious portables

Posted: 12 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:low dropout driver? white LED driver? low dropout voltage?

Addressing the migration of white LEDs to lower forward voltages, Catalyst Semiconductor Inc. has introduced the CAT4004, a four-channel low dropout driver (LDD) designed for power-conscious portables where the LEDs are driven directly from the battery.

With the migration of white LEDs to lower forward voltages, a number of portable applications are now able to drive LEDs directly from the system battery without the need to boost voltage, explained Catalyst. The CAT4004 is designed specifically to meet the needs of this emerging requirement by achieving a low dropout voltage of 130mV (at 30mA), which maximizes LED performance as system battery voltage decays, and allows designers to significantly extend battery life, said the company.

The CAT4004 LDD features tight current matching of 5 percent across a wide range of LED voltages. It also offers LED programming via Catalyst's one-wire EZDim interface, which allows output enable/disable and LED dimming control all from a single I/O on the system MCU. LED current can be controlled at six levels: 100 percent (full-scale brightness), 50 percent, 25 percent, 12.5 percent, 6 percent and 3 percent.

The CAT4004 also offers thermal shutdown protection and is RoHS-compliant. The device is packaged in an 8-lead TDFN (2-by-3mm). Pricing is 52 cents each in quantities of 10,000.

Samples are available. Projected lead time for production quantities is six to eight weeks ARO.

- Gina Roos
eeProductCenter




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