[原创] Maxim MAX1722x超低静态电流可穿戴电源解决方案

Maxim公司的MAX17220‒MAX17225系列是超低静态电流升压DC/DC转换器,具有225mA/0.5A/1A峰值电感限流和真关断.VOUT 0V到5V时没有反向电流,峰值效率95%, 400mV-5.5V输入,输出电压1.8V-5V,最低起动电压0.88V,主要用在光学心率监测(OHRM)LED驱动器,RTC/警报器超级电容备份,原电池手持系统,微型低功耗IoT传感器,二次电池便携式系统,可穿戴设备,电池医疗设备和低功耗无线通信设备.本文介绍了MAX17222主要优势和特性,框图和多种应用解决方案,评估板MAX17222EVK主要特性,电路图,材料清单和PCB设计图.

The MAX17220–MAX17225 is a family of ultra-lowquiescent current boost (step-up) DC-DC converters witha 225mA/0.5A/1A peak inductor current limit and TrueShutdown™. True Shutdown disconnects the output fromthe input with no forward or reverse current. The outputvoltage is selectable using a single standard 1% resistor.

The 225mA (MAX17220), 500mA (MAX17221/MAX17222/MAX17223), and 1A (MAX17224/MAX17225) peak inductorcurrent limits allow flexibility when choosing inductors. TheMAX17220/MAX17222/MAX17224 versions have poststartupenable transient protection (ETP), allowing theoutput to remain regulated for input voltages down to400mV, depending on load current. The MAX17220–MAX17225 offer ultra-low quiescent current, small totalsolution size, and high efficiency throughout the entire load

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