RT9971

RT9971 7 CH Power Management IC General Description The RT9971 is a complete power supply solution for digital still cameras and other hand held devices. The RT9971 is a multi-channel power management IC including two stepup DC/DC converters, two step-down DC/DC converters, one selectable step-up/step-down DC/DC converter, one inverting DC/DC converter and one WLED driver. The RT9971 is designed to fulfill the applications for DSC just 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 high voltage step-up output for CCD bias power supply CH6 is an inverting output for negative CCD bias power supply CH7 is a high voltage step-up output for driving WLED For the CH2, the step-up or step-down converter, operation mode can be selected by the SEL pin. Among all CHs, there are 5 CHs with the built-in internal compensation. The RT9971 also provides a transformerless inverting converter for supplying the CCD power. For the synchronous step-up and step down converters, the efficiency can be up to 95%. The IC provides load disconnection for CH 1 and CH 5. The IC has selectable RTC_LDO/SW1 that can be determined by the CN pin. The RT9971 is able to support Li-ion and 2AA battery applications. The RT9971 provides WLED open protection, current limit, thermal shutdown protecti...