Description

The ADM8843 uses charge pump technology to provide thepower to drive up to four LEDs. The LEDs are used for backlightinga color LCD display that has regulated constant currentfor uniform brightness intensity. The main display can use up tothree LEDs, and the sub display uses one LED. The CTRL1 andCTRL2 digital input control pins control the shutdown operationand the brightness of the main and sub displays.To maximize power efficiency, the charge pump can operate in1?, 1.5?, or 2? mode. The charge pump automatically switchesamong 1?/1.5?/2? modes, based on the input voltage, tomaintain sufficient drive for the LED anodes at the highestpower efficiency.Improved brightness matching of the LEDs is achieved by afeedback pin that senses individual LED current with a typicalmatching accuracy of 0.3%.Applications Cellular phones with main and sub displays White LED backlighting Camera flash/strobes and movie light applications Micro TFT color displays DSC PDAs

Type:

Part number: ADM8843EB-EVALZ

More details from Analog Devices Inc.