I was looking for a low quiescent voltage regulator to use in a low power atmega328 device and came across some regulators such as LM2574, LM2575 or MC33761, that has an on/off pin. How does one use that pin?
I'm a bit confused. The only way I could think of controlling this pin would be using the uC, but turning the regulator off wouldn't turn the uC off as well?
Edit: What happens when the regulator is turned off?