Systems and methods for charging a battery with a digital charge reduction loop

A system comprising:

• a digital charge reduction loop comprising:
• means for determining a charge-current adjustment signal based on a source voltage of an input source;
• means for generating a digital count value based on the charge-current adjustment signal;
• and
• means for generating an analog control signal based on the digital count value, the control signal being representative of an amount of charge current to be used to charge a battery;
• a means for receiving a charge-current control signal to control an amount of charge current being drawn from the input source;
• a means for generating an analog control signal representative of a maximum amount of charge current to be used to charge the battery;
• and
• a means for selecting one of the analog control signal, the selected control signal being used as the charge-current control signal to the means for receiving the charge-current control signal.

A method comprising:

• determining a charge-current adjustment signal based on a source voltage of an input source;
• generating a digital count value based on the charge-current adjustment signal;
• generating a DAC control signal based on the digital count value of the counter, the DAC control signal being representative of an amount of charge current to be used to charge a battery;
• receiving a charge-current control signal to control an amount of charge current being drawn from the input source;
• generating an analog control signal representative of a maximum amount of charge current to be used to charge the battery;
• and
• selecting one of the analog control signal or the DAC control signal, the selected control signal being used as the charge-current control signal to the charge-current control circuit.