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RT9971 是一款完整的电源供应解决方案，适用于数码相机与其他手持式设备。RT9971 是一款多通道电源管理 IC，包含两个升压 DC/DC 转换器、两个降压 DC/DC 转换器、一个可选式升压 / 降压 DC/DC 转换器、一个反相 DC/DC 转换器与一个 WLED 驱动器。RT9971 设计用于满足 DSC 应用需求如下：CH1 是同步升压输出，用于马达或 DSC 系统 I/O 电源CH2 是可选式同步升压 / 降压输出，用于马达或 DSC 系统 I/O 电源CH3 与 CH4 是同步降压输出，用于 DSP 核心与存储器电源供应CH5 是高电压升压输出，用于 CCD 偏置电源供应CH6 是反相输出，用于负 CCD 偏置电源供应CH7 是高电压升压输出，用于驱动 WLED对于 CH2，可通过 SEL 引脚选择升压或降压转换器运行模式。在所有通道中，有 5 个通道具备内置内部补偿。RT9971 亦提供无变压器反相转换器，用于供应 CCD 电源。对于同步升压与降压转换器，效率可高达 95%。此 IC 为通道 1 与通道 5 提供负载断接功能。此 IC 具备可选式 RTC_LDO/SW1，可由 CN 引脚决定。RT9971 可支持锂离子与 2AA 电池应用。RT9971 提供 WLED 开路保护、电流限制、热关断保护、过压与欠压保护，以实现完整保护。RT9971 采用 WQFN-40L 5x5 封装。
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<div class="spec-list"><ul class="lv1"><li>One Synchronous Step-Up or Step-Down Selectable Convertor </li><li>Support 2AA or Li-ion Battery Applications </li><li>Preset On/Off Sequence </li><li>5 Channels with Internal Compensation </li><li>All Power Switches Integrated </li><li>Up to 95%Efficiency </li><li>100%(max) Duty Cycle for Step-Down Converter </li><li>Adjustable Output Voltage </li><li>LED PWM Dimming Control </li><li>LED Open Protection </li><li>Transformerless Inverting Converter for CCD </li><li>Fixed 1MHz Switching Frequency at CH1 to CH7 </li><li>RTC_LDO/SW1 Selectable by CN Pin </li><li>40-Lead WQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>Digital Still Camera </li><li>PDA </li><li>Portable Device </li></ul></div>
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