I have a battery-powered circuit (2x 3.7 V LiPo batteries) and I want to use a push-button as on switch by using some sort of low power self-holding mechanism. I have two possible solutions in my mind:
Option 1
This option uses a switch to enable the battery voltage and the MCU will assert the SH
signal, so the transistor Q206
is turned on permanently.
Option 2
This option applies the battery voltage directly to the LDO and enables the LDO when the push button is pressed. Again the MCU will assert SH
and bridge the switch.
I´m unsure which of these methods is the better one with the aspect of the current consumption. And I´m unsure if Option 2 is working very well. Maybe booth circuits can be improved in terms of current consumption. The only thing that I would improve is the value of the resistors (replace 100k with 1M). Are there any other options to improve that circuit?