Switched capacitor converter with tap-change capability

A switched capacitor converter battery charging circuit comprising:

• an input configured to receive an input current;
• an output configured to deliver an integer multiple of the input current to a battery;
• a plurality of phases with each phase comprising a plurality of flying capacitor stages disposed between the input and output, wherein the plurality of phases are operated in an interleaved manner to reduce current or voltage ripple, wherein each of the plurality of flying capacitor stages comprises;
• a flying capacitor;
• a high side complementary switch pair;
• and
• a low side complementary switch pair;
• and controller circuitry coupled to the plurality of flying capacitor stages that selectively enables or disables one or more of the plurality of flying capacitor stages to select the integer multiple responsive to a voltage supplied at the input.

A method of operating a switched capacitor converter battery charger, the method comprising:

• selectively enabling or disabling one or more flying capacitor stages of the switched capacitor converter to select an integer multiple applied to an input current of the battery charger to produce an output current supplied to the battery, wherein each of the one or more flying capacitor stages comprises:
• a flying capacitor;
• a high side complementary switch pair;
• and
• a low side complementary switch pair;
• wherein the integer multiple is selected in response to an input voltage of the switched capacitor converter battery charger.