What's the simplest circuit for an inline latching power switch?
I have a 12V lipo going into a step-down converter powering an Arduino. I'd like the Arduino to be able to completely power itself off (not simply go to sleep). However, neither the 12V lipo nor the converter have any built-in means of being controllable from a digital pin.
I've found several examples of latching power switches, but they're all relatively complicated, and assume the switch is incorporated into the regulator. I don't want to modify any components. I just want to put a "box" in between the 12V lipo and converter, wired to an Arduino pin, which will break the high-side when the pin goes low.
What's the simplest way to do this with the minimum of components?