Patent ID: 8379009
Filing Date: 2013-02-19
Classification: G09G,H02M

Abstract:
1. A booster power supply circuit comprising: a first voltage control switch circuit connected between a first terminal to which one terminal of a first boosting capacitor element is connected and a supply node of an input voltage, the first voltage control switch circuit having a switch function which controls a resistance between both terminals depending on a first control signal; a second voltage control switch circuit connected between a second terminal to which the other terminal of the first boosting capacitor element is connected and the supply node of the input voltage, the second voltage control switch circuit having a switch function which controls a resistance between both terminals depending on a second control signal; a first switch element connected between a third terminal to which one terminal of a second boosting capacitor element is connected and at which an output voltage is generated and the first terminal, the first switch element being switching-controlled depending on a third control signal; a second switch element connected between a node of a reference voltage side of the input voltage and the second terminal, the second switch element being switching-controlled depending on a fourth control signal; and a control circuit which detects the output voltage generated at the third terminal and controls the first and second voltage control switch circuits such that the output voltage has a desired value depending on a detection result, wherein the first voltage control switch circuit has: a second analog switch element having a current path connected between the gate of the fourth MOS transistor and the output node of the control circuit and including at least a sixth MOS transistor of a second channel type, both the second MOS transistor and the first analog switch element are energized and controlled by the first control signal, and both the fifth MOS transistor and the second analog switch element are energized and controlled by the second control signal.