Charge Pumps
austriamicrosystems introduces smart 1 A charge pumps for flash LEDs in camera phones. The two high-current charge pumps, the AS3682 and the AS3683, drive flash LEDs with up to 480 mA and 1 A output current, respectively. The ICs achieve a peak efficiency of 95% (PLed/Pin) due to supporting automatic mode switching between 1×/1.5× and 2× modes and through their low dropout current sinks. The six current sinks can be used with individual LEDs connected in parallel or tied together for driving a single high-output LED. The output currents can be adjusted between 15 mA and 1 A by either a serial interface using soft flash mode or a simple parallel interface using hard flash mode. The hard flash mode is implemented as a three-pin enable/disable function so that eight different currents can be set for both preview and flash by using only two control wires.
austriamicrosystems AG
austriamicrosystems
8601 Six Forks Road, Suite 400
Raleigh, NC, 27613
© 2008 Advantage Business Media
|
