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RT5021 是一款完整的电源管理解决方案,专为数位相机及其他手持式装置设计。RT5021 整合多通道 DC/DC 电源转换器、单节锂离子电池线性充电器、充电器类型侦测功能,以及 I²C 控制介面,可大幅简化系统电源架构设计。 其电源转换器单元包含一组同步升压转换器(CH1)、一组同步升降压转换器(CH2)、三组同步降压转换器(CH3/CH4/CH5)、两组最低输入电压可达 1.5V 的 LDO(CH6/CH8)、一组可工作于同步高压升压模式或低压电流调节模式的 WLED 驱动器(CH7),以及一组供 RTC 应用使用的维持电源 LDO(CH9)。所有转换器皆内建频率补偿与功率 MOSFET,并具备过电流保护、过温保护、过电压保护及欠压保护等完整保护功能。此外,RT5021 内建 WAKEUP 脉冲产生电路,可监测 VIN 或电池安装事件,并提供六组预设电源开启与关闭时序,以满足各类应用需求。 充电器部分整合自动电源路径管理(APPM, Auto Power Path Management)功能,无需额外外接 MOSFET。当外部电源移除时,充电器可自动进入休眠模式以降低功耗。充电流程采用智慧控制演算法,可依据电池状态自动切换预充电模式(Pre-Charge)、快速充电模式(Fast Charge)及定电压模式(Constant Voltage)。充电电流亦可透过 I²C 介面进行设定。电池充电电压与电流可依据 JEITA 温度规范,或透过 I²C 设定其他充电策略进行调整。内建热回授控制电路可根据晶片温度自动调节充电速率,以最佳化各种环境温度下的充电效率。当充电电流下降至快速充电电流的 10% 时,系统将于定电压模式下自动终止充电。 RT5021 同时提供输入欠压保护及过压保护,并内建 USB 充电器侦测功能,可透过 USB D+ 与 D− 脚位辨识标准下游埠(SDP)、充电下游埠(CDP)、专用充电埠(DCP)及 Apple/Sony 充电器类型。此外,RT5021 提供两组开漏输出讯号 CHG 与 CHG2,以及中断输出 INT,可即时回报充电状态变化。 RT5021 透过 I²C 介面提供完整的电源转换器与充电器功能控制,并采用 WQFN-40L 5mm × 5mm 封装。
RT5021 电路图
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<div class="spec-list"><ul class="lv1"><li>Power Converter Unit </li><li>CH1 LV Sync Step-Up <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS (Dynamic Voltage Scaling), Load-Disconnect, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH2 LV Sync Step-Up/Down <ul class="lv2"> <li></li><li>Support Up to 1A Loading, DVS, Up to 95% Efficiency, PSM/PWM Selectable </li></ul> </li><li>CH3/4 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 1.3A Loading, DVS, Up to 95% Efficiency, 100% (MAX) Duty Cycle, PSM/PWM Selectable </li></ul> </li><li>CH5 LV Sync Step-Down <ul class="lv2"> <li></li><li>Support Up to 0.6A Loading, Up to 95% Efficiency, 100% (MAX) Duty Cycle </li><li>Output Voltage can be Selected from Preset List or Set by External Feedback Network </li></ul> </li><li>CH6 Low Input Power LDO <ul class="lv2"> <li></li><li>V<sub>IN</sub> Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH7 WLED Driver in Either Sync Step-Up Operation or Current Regulator Operation <ul class="lv2"> <li></li><li>Step-Up Mode with LED Open Protection (OVP7 16V or 25V, Selectable in I<sup>2</sup>C Register) </li><li>Step-Up Mode Support Series 2 to 6 WLED and Load Disconnect Function </li><li>Current Regulator Mode for 1 WLED </li><li>31 WLED Dimming Levels </li><li>Automatic Mode Selection by External Circuit Topology </li></ul> </li><li>CH8 Generic LDO <ul class="lv2"> <li></li><li>V<sub>IN</sub> Range 1.5V to 5.5V </li><li>Output Voltage Level Selectable in I<sup>2</sup>C Register </li></ul> </li><li>CH9 Low Quiescent LDO with Reverse Leakage Prevention for RTC Power Supply <ul class="lv2"> <li></li><li>Fixed 3.05V Output </li></ul> </li><li>Six Preset Power On/Off Sequences by One Pin SEQ <ul class="lv2"> <li></li><li>SEQ

0 : CH2→CH3→CH4 </li><li>SEQ # 1 : CH1→CH3→CH2→CH4 </li><li>SEQ # 2 : CH1→CH3→CH4→CH2 </li><li>SEQ # 3 :

CH1→CH2→CH4→CH3 </li><li>SEQ # 4 : CH1→CH4→CH3→CH2 </li><li>SEQ # 5 : CH1→CH4→CH2→CH3 </li></ul> </li><li>All Power Switches Integrated with Internal Compensation </li><li>Discharge Output of Every Channels when Turning Off </li><li>Wake Up Impulse to Monitor BAT and VIN Plug-In </li><li>Fixed 2MHz Switching Frequency for CH1/3/4/5, Fixed 1MHz Switching Frequency for CH2/7Charger Unit </li><li>28V Maximum Rating for V<sub>IN</sub> Power </li><li>Selectable Power Input Current Limit (0.1A / 0.5A / 1A / 1.5A) </li><li>Auto Power Path Management (APPM) with Integrated Power MOSFETs </li><li>Battery Charging Current Control and Regulation Voltage Control </li><li>Programmable Charging Current and Safe Charge Timer </li><li>Optimized Charge Rate Via Thermal Feedback </li><li>Under Voltage Protection, Over Voltage Protection </li><li>Charger Status and VIN Power GOOD Indicators </li><li>Interrupt Indicator to JEITA Temperature/Fault/Status Events when PMU is Enabled <ul class="lv2"> <li></li><li>Battery Temperature Events </li><li>Battery Removing Event </li><li>Charger in Thermal Regulation Control </li><li>Safety Timer Timeout </li><li>End of Charging </li><li>VIN Power Good </li><li>VIN < DPM Threshold 4.35V </li><li>Charger Type Detection Finishing </li></ul> </li><li>Charger Type Detection <ul class="lv2"> <li></li><li>Dedicated Charger : Support Apple and Sony Charger </li><li>Secondary Charger Detection to Distinguish CDP and DCP </li></ul> </li><li>I<sup>2</sup>C Control Interface : Support Fast Mode up to 400kb/s </li><li>Small 40-Lead WQFN Package </li><li>RoHS Compliant and Halogen Free </li></ul></div>

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RT5021 订购信息
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<div class="spec-list"><ul class="lv1"><li>DSC Power Supply System </li><li>CMOS-Sensor DV </li><li>Portable Instruments </li></ul></div>
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