Versatile Battery Charging System and Control Method

A battery charging system includes a buck switching converter configured to operate in either a buck mode or a boost mode depending on a system reconfiguration, a linear charger having a first terminal and a second terminal, wherein at least one terminal of the first terminal and the second terminal of the linear charger is used for the system reconfiguration, and a switched capacitor converter configured to operate in either a 2:1 charge pump mode or a 1:2 reverse charge pump mode depending on the system reconfiguration.