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V(DPPM)的取值 范围是2.6~3.8V，这个值一般要比Vout后续接的负载系统的工作电压高多少才合适，看到有设计应用说应该比负载系统工作电压高0.5V。但V(BAT)给负载系统供电时只通过了Q2，Q2上面不会产生很大的压降吧？
电池通过FET放电时，芯片会自动打开FET驱动，从而降低FET上的压降及损耗。VDPPM一般比sys最低允许电压略高就行。
