资 源 简 介
The RT9902 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, and alinear controller that drives an external P-ChannelMOSFET for linear regulator. The RT9902 is targeted forapplicaTIons that use either two or three AA cells or a singlelithiumion battery.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 adjustableoutput from 0.8V to 5.5V. Each DC-DC converter hasindependent shutdown input.The feature of the charge pump is to deliver few currentto micro-controller when the system operates in thestandby mode. RT9902 includes a linear controller with0.8V reference voltage. An adjustable operaTIng frequency(up to 1.4MHz) is utilized to get optimum size, cost, andefficiency.RT9902 is available in VQFN-32L 5x5 package.
