Patent ID: 8058853

Claim:
A voltage output circuit outputting a first voltage and a second voltage based on an input voltage inputted from an input terminal, comprising: a coil disposed between the input terminal and two output terminals which are a first voltage output terminal outputting the first voltage and a second voltage output terminal outputting the second voltage, respectively; a first charge pump circuit disposed between the coil and the first voltage output terminal, and transforming the input voltage to output the transformed input voltage as the first voltage; a first switch disposed between a ground and a connection point connecting the coil to the first charge pump circuit, and switching between ON and OFF of the transformation by the first charge pump circuit; a controller that controls the switching between ON and OFF of the first switch in order to turn the first voltage to be outputted from the first voltage output terminal into a desired value; a second charge pump circuit disposed between the second voltage output terminal and a connection point connecting the coil to the first switch, and transforming the input voltage by using a stored electric power according to ON/OFF of the first switch to output the transformed input voltage as the second voltage; a second switch disposed between the second charge pump circuit and a ground, and selecting whether or not to store the electric power to be used to transform the voltage in the second charge pump circuit; and a switching unit that switches between ON and OFF of the second switch based on the second voltage outputted from the second voltage output terminal.