Patent ID: 7663428

Claim:
A boosting charge pump circuit which boosts an external power supply voltage to a predetermined internal voltage and outputs the internal voltage to an internal power line, the boosting charge pump circuit comprising first and second charge pump circuit units, the first and second charge pump circuit units each comprising: a first connection switching terminal selecting one of a power source voltage and a boost control voltage which is inputted from outside; a charge pump capacitor; a boosting portion which charges the charge pump capacitor to be the power supply voltage, and which boosts the power supply voltage or the boost control voltage selected by the first connection switching terminal by applying a charged voltage of the charge pump capacitor; a second switching terminal for switching operations of outputting a boosted voltage supplied by the boosting portion to the internal power line and outputting the boosted voltage supplied by the boosting portion as the boost control voltage to the outside; and a boosted voltage output portion for outputting the boosted voltage to the internal power line if the second connection switching terminal has determined to output the boosted voltage to the internal power line, wherein the first connection switching terminal selects the power source voltage, the second connection switching terminal outputs the boosted voltage to the internal power line, and the boosting charge pump circuit comprises: a switching portion which connects and disconnects to both a side of outputting a boosted voltage from the charge pump capacitor of the first charge pump circuit unit and a side of outputting a boosted voltage from the charge pump capacitor of the second charge pump circuit unit; and a control portion which controls both the first and second charge pump circuit units in order to conduct both boosting and discharging operations alternately while having a predetermined interval, and turns on the switching portion during the predetermined interval.