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LMZ13608静态电流疑问?

参数按照官网参考电路设计,输入电压为12V,输出电压为5v,电路静态电流达到33ma左右(en引脚悬空),拉低en引脚,关断电流低于1ma(输入端电源最低显示电流为1ma),输入电压为8v,输出电压为5v,静态电流可下降到15ma左右,上面两种测试都是没有接负载的情况下完成。求教怎么回事?