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:
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.
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?