The RT9901 is a complete power-supply solution for digitalstill cameras and other hand-held devices. It integrates ahigh-efficiency main step-up DC-DC converter, two highefficiencystep-down converters, a charge pump, andvoltage detector. The RT9901 is targeted for applicationsthat use either two or three AA cells or a single lithiumionbattery.The main step-up DC-DC converter accepts inputs from1.5V to 5.5V and build in 2.6A Internal switch. The twostep-down DC-DC converters (CH2, CH3) accept inputsfrom 1.5V to 5.5V and regulate a resistor-adjustable outputfrom 0.8V to 5.5V. Each DC-DC converters haveindependent shutdown inputs.The feature of the charge pump is to deliver few currentto micro-controller when the system operates in thestandby mode. RT9901 include a low battery detector with0.8V detection voltage. An adjustable operating frequency(up to 1.4MHZ) is utilized to get optimum size, cost, andefficiency.RT9901 is available in VQFN-32L 5x5 package.
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