Patent Number: 6,294,950

Title: Charge pump circuit having variable oscillation period

Abstract: The present invention relates to a charge pump circuit which can vary an oscillation frequency for charge pumping in proportion to a charge consumption amount. The charge pump circuit includes: a voltage divider dividing a boosting voltage to a predetermined level; a voltage level sensing unit sensing a voltage difference between a divided voltage outputted from the voltage divider and a reference voltage, and outputting a control voltage corresponding to the sensed voltage difference; an oscillator circuit varying an oscillation frequency in accordance with the control voltage outputted from the voltage level sensing unit; and a charge pump performing a pumping operation in accordance with the output from the oscillator circuit, and outputting a boosting voltage.

Inventors: Lee; Jae-Goo (Kwangmyung, KR), Jun; Young-Hyun (Seoul, KR)

Assignee: Hyundai Electronics Industries Co., Ltd.

International Classification: H02M 3/07 (20060101); H02M 3/04 (20060101); G05F 001/10 ()

Expiration Date: 09/25/2018