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TPS60401: 用4.2V锂电池转换负电压给运放使用,有静态工作电流比这个更低的器件吗?

Part Number: TPS60401
Other Parts Discussed in Thread: LM828

设备供电由4.2V锂电池和光伏发电板组成,所以需要低功耗设计,静态工作电流要尽可能的小。除了这种电荷泵之外有低功耗的器件或电路设计能做到输入正电压,输出负电压吗?