RT9953

RT9953 4+1 CH Power Management IC General Description The RT9953 is a complete power supply solution for digital still cameras and other handheld devices. The RT9953 is a multi-CH power management IC including one synchronous step-up DC/DC converter, one selectable synchronous step-up/step-down DC/DC converter, two synchronous step-down DC/DC converters, and one low dropout linear regulator. The RT9953 is designed to fulfill the applications for DSC as follows : CH1 is a synchronous step-up output for motor or DSC system I/O power CH2 is a selectable synchronous step-up/step-down output for motor or DSC system I/O power CH3 and CH4 are synchronous step-down outputs for DSP core and memory power supply CH5 is a 500mA, low dropout, low noise linear regulator with soft-start function. The RT9953 is designed to support Li+ and 2AA battery applications. The selectable step-up/step-down converter can be set by SEL pin. For the synchronous step-up and step down converters, the efficiency can be up to 95%. The RT9953 provides over current protection, thermal shutdown protection, over voltage and under voltage protection to achieve complete protection. The RT9953 is available in the WQFN-24L 4x4 package. Features z One Synchronous Step-Up/Step-Down Selectable Converter Support 2AA or Li-ion Battery Applications Internal Soft-Start Control 4 CHs with Internal Compensation Power Switches Integrated Up to 95% Efficiency 100% (max) Duty Cycle for Step-Down Converter Adjustable Output Vo...