Say I have a 12 V battery powered device, with a logic and control board that take 5V sourced from the 12V supply, what is the solution to powering up the device from standby while not unnecessarily draining the battery while in standby?
I expect I do not want a constant 12>5V downconverter operating full time to power the logic and respond to a power on request, so what is the solution to enabling standby in a system such as this?