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小电流宽电压范围系统电源ic如何选

Other Parts Discussed in Thread: LMR14006

现在在做一款基于zigbee的无线温度传感器应用,系统工作电压2.1-3.6v,休眠不到1uA, 测量300uA, rf 18mA

此系统即支持电池供电有支持在线供电,通过开关选择

在线供电方式为 dc 9-28v 请问选线性稳压还是dc-dc convert ic

不知道低效率会不会发热,此为温度采集,尽量不要有温升

请推荐个型号 

谢谢!