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The RT9986A is a complete power supply solution for digital still cameras and other handheld devices. It includes one synchronous step-up DC/DC converter with load disconnect, one selectable synchronous step-up/step-down DC/DC converter, two synchronous step-down DC/DC converters, one synchronous high voltage step-up DC/DC converter, one inverting DC/DC converter, and one selectable synchronous high voltage step-up/current-source for WLED. In addition, the RT9986A also includes one RTC_LDO, one voltage detector, and one System Reset. All power MOSFETs are integrated in the RT9986A. <p align="justify">The RT9986A is designed to fulfill the applications for DSC as follows : </p><p align="justify">CH1 is a synchronous step-up output for motor or DSC system I/O power </p><p align="justify">CH2 is a selectable synchronous step-up/step-down output for motor or DSC system I/O power </p><p align="justify">CH3 and CH4 are synchronous step-down outputs for DSP core and memory power supply </p><p align="justify">CH5 is a synchronous high voltage step-up output for CCD bias power supply </p><p align="justify">CH6 is an inverting output for negative CCD bias power supply </p><p align="justify">CH7 is a selectable synchronous high voltage step-up/current source for driving WLED </p><p align="justify">The selectable step-up/step-down converter can be auto selected by external component topology. For the RT9986A, all 7-CHs have built in internal compensation. The RT9986A also provides a transformerless inverting converter for supplying CCD power. For the low voltage synchronous step-up and step down converters, efficiency can be up to 95%. </p><p align="justify">The RT9986A provides comprehensive protection features including over current protection, thermal shutdown protection, over voltage protection, overload protection, and under voltage protection.</p>
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- 仅需改变外部组件的连接关系即可将 CH2 设定为升压或降压电路
- CH1, CH2, CH3, CH4 的开关机时序是预设好的(1→3→4→2)
- CH5, CH6 的开关机时序是预设好的(5→6)
- 所有通道都包含了内部补偿电路
- 集成了全部功率开关
- 所有升压电路都含有负载断开电路
- 降压型 DC/DC 转换器
►效率高达 95%
►最大责任周期为100% - 升压型低压 DC/DC 转换器
►输出电压可调
►效率高达 95% - WLED 驱动器
►外部组件拓扑自动决定电路拓扑
►电流源模式下输出为 30mA 电流
►升压模式下有 LED 开路保护功能(OVP7)
►直通式 PWM 调光控制 - CH1/2/3/4 工作频率为 2MHz， CH5/6/7 工作频率为 1MHz
- 小型32引脚 WQFN 封装
- 符合 RoHS 规范，不含卤素
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Digital Still Camera PDA Portable Devices
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