What\s the impact of a regulator\s low dropout on its input voltage?
A regulator”s dropout voltage determines the lowest usable input supply voltage. That is, although the specifications may show a broad input-voltage range, the input voltage must still be greater than the dropout voltage plus the desired output voltage. For a 200-mV-dropout LDO, the input voltage must be above 3.5 V to produce a regulated 3.3-V output.
