Patent ID: 7764113

Claim:
An output circuit comprising: an output transistor having a first main terminal to which an input voltage is input, a second main terminal from which an output voltage is output and a control terminal, wherein a drive voltage supplied to the control terminal is equal to or higher than the drive threshold voltage of the output transistor, the drive voltage being generated in response to a potential of the second main terminal, whereby an impedance between the first main terminal and the second main terminal can be controlled; a control drive circuit for supplying said drive voltage to the control terminal of said output transistor to control the output voltage from the second main terminal of said output transistor; and a charge pump circuit, configured so as to output a predetermined voltage being equal to or higher than said drive threshold voltage; said predetermined voltage being generated in response to the potential of the second main terminal of said output transistor, for supplying a power supply voltage to the control drive circuit, the power supply voltage being obtained by adding the predetermined voltage to the output voltage from the second main terminal of said output transistor.