I am trying to decide where to put the main power switch on a circuit with a Li cell, charger PMIC, and switching regulator. The switching regulator I'm considering (ON semi NCP1522B) has an ENable input. The charger PMIC (MCP73831) is basic, and will only be parallel to Vbat as the Vin on the regulator.
I see in the datasheet that the standby current when EN is low is max 1.5uA. If I use a simple SPST switch to pull EN high as a power switch, will that be sufficient for the system to not drain the battery much when "off"? Would it be better to put the power switch in front of Vin, or is there a better way to do this altogether?