A power converter comprising: a regulator comprising an output terminal to output an output voltage according to a first reference voltage, the output terminal to be coupled to a load; and a controller coupled to the output terminal, the controller to increase a current flowing from the regulator to the controller when a voltage at the output terminal (Vreg_out) is lower than a second reference voltage, and to decrease the current flowing from the regulator to the controller when the voltage at the output terminal is greater than a third reference voltage, wherein the regulator comprises: a first transistor to increase the current flowing from the regulator to the controller when the first transistor is turned on; and wherein the controller comprises: a plurality of first comparators to control the first transistor according to the second reference voltage; a second transistor to decrease the current flowing from the regulator to the controller when the second transistor is turned on; and a plurality of second comparators to control the second transistor according to the third reference voltage characterized in that the plurality of first comparators comprises a first comparator to turn on the first transistor and a second comparator to turn off the first transistor and the plurality of second comparators comprises a third comparator to turn on the second transistor and a fourth comparator to turn off the second transistor. a regulator comprising an output terminal to output an output voltage according to a first reference voltage, the output terminal to be coupled to a load; and a controller coupled to the output terminal, the controller to increase a current flowing from the regulator to the controller when a voltage at the output terminal (Vreg_out) is lower than a second reference voltage, and to decrease the current flowing from the regulator to the controller when the voltage at the output terminal is greater than a third reference voltage, wherein the regulator comprises: a first transistor to increase the current flowing from the regulator to the controller when the first transistor is turned on; and wherein the controller comprises: a plurality of first comparators to control the first transistor according to the second reference voltage; a second transistor to decrease the current flowing from the regulator to the controller when the second transistor is turned on; and a plurality of second comparators to control the second transistor according to the third reference voltage a first transistor to increase the current flowing from the regulator to the controller when the first transistor is turned on; and wherein the controller comprises: a plurality of first comparators to control the first transistor according to the second reference voltage; a second transistor to decrease the current flowing from the regulator to the controller when the second transistor is turned on; and a plurality of second comparators to control the second transistor according to the third reference voltage a plurality of first comparators to control the first transistor according to the second reference voltage; a second transistor to decrease the current flowing from the regulator to the controller when the second transistor is turned on; and a plurality of second comparators to control the second transistor according to the third reference voltage characterized in that the plurality of first comparators comprises a first comparator to turn on the first transistor and a second comparator to turn off the first transistor and the plurality of second comparators comprises a third comparator to turn on the second transistor and a fourth comparator to turn off the second transistor.