I have a scenario in which one of two power sources is selected by a power multiplexing:
One solution is to use already existing mux ICs like TPS2115A. The problem is that the leakage of these ICs are relatively high for my application. For example, the leakage current when the input 1 is inactive is around 50uA which is quite high for an indoor solar power harvesting (unless if I'm missing a power mux IC with extremely low leakage).
I'm considering two possible solutions (which I'm not sure about):
1- Use a low leakage switch between the power source and the mux input 1 to limit the inactive leakage current:
The leakage of the switch could be far less than the leakage in mux IC. So when the switch is disabled it would limit the leakage current of the inactive input. To test if this solution is feasible, I manually added a reverse diode between power source 1 and input 1 in the inactive mode; it substantially reduced the leakage current without affecting the output (from source 2).
2- Getting rid of the power mux IC and have one switch for each power source:
I'm not sure if connecting two switches in this configuration is a good idea or not.
But I'd appreciate if anyone has had similar problem or has suggestions.