I've been designing a battery charger circuit for a while. I couldn't decide how to shut down the current flowing through battery. Actually, a simple output diode helps a lot but they make ~0.5V drop and when current flows through it, it lowers down efficiency for about %2-3 percent.
This is the second circuitry that I tried. I am using a MCU with 3.3V logic, this circuitry works well when changing load on and off. However, In my application, the load is a battery which may pump back all the current when supply is low.
I trying to find out which possible way will work the best for this application.