Control circuit and control method for charge pump circuit
AssigneeRohm Co., Ltd.
InventorsShinichi SAITOH, Yo YAMASHIRO
Life of this patent
Estimating the term…
Abstract
A charge pump circuit is provided. A voltage/current conversion circuit compares a feedback voltage that corresponds to the 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 oscillates at a frequency that corresponds to the bias current. A buffer is biased by the bias current, and supplies a gate clock to the charge pump circuit based upon a clock signal output from the oscillator, thereby driving the charge pump circuit.
Claims8
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.
A control method for a charge pump circuit including:
- comparing a feedback voltage that corresponds to an output voltage of the charge pump circuit with a predetermined reference voltage, and generating a bias current that corresponds to the difference therebetween;
- generating a clock signal with a frequency that corresponds to the bias current;
- and
- driving the charge pump circuit by supplying a gate clock to the charge pump circuit based upon the clock signal, using a buffer biased according to the bias current.
Dependencies are inferred from the claim text.