Let me ask about REG71050.
Is the input voltage range of this IC 2.7V?5.5? I contributed, in order that there might be no statement in a data sheet.
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From the datasheet:
REG71055 3.0 V to 5.5 V
REG710-5 2.7 V to 5.5 V
All other models 1.8 V to 5.5 V
See conditions under Output Voltage with aresistive load no lower than typical Vout / Iout