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
http://www.austriamicrosystems.com
©
2012
Advantage Business Media
|
