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TPS24740: Dual Battery charging using single Battery charger

Part Number: TPS24740
Other Parts Discussed in Thread: TPS2595, , TPS24750, TPS22976

Hello Team my customer has come up with a unique requirement , where in he wants to charge 2 batteries using a single battery charger .

The system schematic shall look something like below .

He has a uC to do the gating of the power paths for both charge and discharge .

The battery voltage ranges from 3V to 4.5V 

The current in the discrete back to back mosfet shall be around 6A .

What is the most cost optimized solution we have as of today to drive these back to back mosfet using a control signal from a uC.

Also lets say if we want individual control of both the back to back mosfet what shall be the best solution .