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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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  • 一路同步升压/降压可选的转换器
  • 支持两节 AA 电池或锂离子电池供电的应用
  • 内置软启动控制
  • 4个通道的内置补偿
  • 集成了功率开关
  • 高达95%的效率
  • 降压转换器的最高占空比可达 100%
  • 可调的输出电压
  • 恒定的 1MHz 开关切换工作频率
  • 线性稳压器可以配合低 ESR 陶瓷电容工作
  • 快速线路/负载瞬态响应能力
  • 线性稳压器具有高 PSRR
  • 符合 RoHS 规范，不含卤素
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CMOS Digital Still Camera CMOS DV Portable Devices
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