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做带有2inch的热敏打印机的手持设备,需要两节锂电池串联,几个芯片如何选择呢?

Other Parts Discussed in Thread: BQ28Z610

做带有2inch的热敏打印机的手持设备,需要两节锂电池串联,几个芯片如何选择呢?

(1)充电管理采用哪个ic呢?要求9V,2A的规格。最好还能插入5V,升压充电,到500ma的充电电流。

(2)降压芯片,需要把这个两节串联起来的,再见到4V给系统供电,需要2.5A的电流,采用哪个降压芯片呢?

(3)电量计,如何选呢?

多谢!