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CMOS Digital Still Camera
CMOS Digital Still Camera
CMOS DV
Portable Devices
One Synchronous Step-Up/Step-Down Selectable Converter
One Synchronous Step-Up/Step-Down Selectable Converter
Support 2AA or Li-ion Battery Applications
Internal Soft-Start Control
4 Channels with Internal Compensation
Power Switches Integrated
Up to 95% Efficiency
100% (max) Duty Cycle for Step-Down Converter
Adjustable Output Voltage
Fixed 1MHz Switching Frequency
LDO Works with Low-ESR Ceramic Capacitors
Fast Line/Load Transient Response
High PSRR Linear Regulator
RoHS Compliant and Halogen Free
4+1 Channel Power Management IC
The RT9953 is a complete power supply solution for digital still cameras and ,other handheld devices. The RT9953 is a multi-channel 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.,,
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