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我们现在有个方案，平时是锂电池供电4.2V，DC-DC降压到3.3V给MCU和其他模块电路供电，当锂电池低压关断后，1节AAA电池1.5V不间断的升压到3.3V给电路系统供电，这需要宽输入范围，同时具备降压升压功能，最好是有输出双通道的，一组5V. 一组3.3V, 集成到一颗电源芯片就能搞定的。
大家有没有用过这样应用场景的电源芯片，有的话麻烦推荐一下，感谢！
