RT9903

Description

The RT9903 is a complete power-supply solution for digital still cameras and other hand-held devices. It integrates a high-efficiency fours step-up DC-DC converters and a charge pump.
The two Step-up DC-DC converters (CH1,CH2) accept inputs from 1.5V to 5.5V and regulate a resistor-adjustable output up to 17V. One Step-up DC-DC converter (CH3) can be regarded as white LED Driver, which reference voltage is 0.2V and have OVP function. One step-up DC-DC converter (CH4) regulate a resistor-adjustable output up 5V. An adjustable operating frequency (up to 1.4MHz) is utilized to get optimum size, cost, and efficiency.
The feature of the charge pump (CH5) is to deliver few current to CCD negative voltage.
RT9903 is available in VQFN-24L 4x4 package. Each DC-DC converters have independent shutdown inputs.