Patent ID: 7956675

Claim:
A control circuit for a charge pump circuit including: a voltage/current conversion circuit which compares a feedback voltage that corresponds to an output voltage of the charge pump circuit with a predetermined reference voltage, and generates a bias current that corresponds to the difference therebetween; an oscillator which oscillates at a frequency that corresponds to the bias current; and a buffer which is biased according to the bias current, and which performs a driving operation by supplying a gate clock to the charge pump circuit based upon a clock signal output from the oscillator, wherein the voltage/current conversion circuit includes: an output terminal via which the bias current is to be output; a differential amplifier which receives the feedback voltage and the reference voltage via an inverting input terminal and a non-inverting input terminal thereof, respectively, and which is biased by a predetermined reference bias current; an output transistor and an output resistor provided in series between the output terminal and a fixed voltage terminal; and a current source which supplies an auxiliary current to the output terminal according to the reference bias current, and wherein the output of the differential amplifier is input to the control terminal of the output transistor.