[原创]Microchip AT73C24－x系列超低成本功率管理单元解决方案

Microchip公司的AT73C24-x系列是超低成本功率管理单元(PMU),工作电压3.3V到5.25V.包括四个电源和一个非常低功耗的实时时钟(RTC).在正常模式(主电池存在),备份电池通过2.6V RTC LDO进行再充电.AT73C24-x系列提供不同的自动程序和不同的软管理模式:寄存器访问的动态(经由SPI或TWI)或静态,访问4个电源的电源开/关.每个器件装配了非常低功耗的能带隙基准电压,低功耗32kHz和1MHz振荡器和内部LDO,用来产生内部电源(VINT) 2.8V.辅助电池如加电重置(POR)和电压监视器用来控制系统加电(电池插入)和电源关断(电池拔出).主要用在手持设备特别是锂电池供电的设备.本文介绍了AT73C224-x系列主要特性,框图,多种应用电路,以及评估板AT73C224-EK1主要特性,框图,电源框图,电路图和PCB设计图.

The AT73C224-x is a family of ultra low cost Power Management Unit, available in a

small outline QFN 5x5mm package.

The AT73C224-x family is optimized for portable applications, typically powered by a

Li-Ion battery. The AT73C224-x device is also suitable to operate from a standard3.3V to 5.25V voltage rail. It includes four power supplies and a very low power RealtimeClock (RTC). In normal mode (main battery present), the backup battery isrecharged through a 2.6V RTC LDO.

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