The present disclosure provides a pump circuit comprising a plurality of first enabling modules. Each of the plurality of first enabling modules is configured to generate a first enable signal and includes a first voltage input, a first comparing unit, a first digital logic gate and a second digital logic gate. The first comparing unit is coupled to the first voltage input and is configured to compare a voltage of the first voltage input with a first reference voltage. The first digital logic gate is coupled to the first comparing unit and is configured to implement a logical operation. The second digital logic gate is coupled to the first digital logic gate and is configured to implement a logical negation. Each of the plurality of first enabling modules generates the first enable signal when the voltage of the first voltage input is less than the first reference voltage.