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Source voltage conversion circuit and its control method, display, and portable terminal

  • US 20030011586A1
  • Filed: 08/01/2002
  • Published: 01/16/2003
  • Est. Priority Date: 12/06/2000
  • Status: Active Grant
First Claim
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1. A power supply voltage converting circuit using a charge pump circuit having a switch device in an output unit, characterized by comprising:

  • a first clamp circuit for diode-clamping a control pulse voltage for said switch device at the time of a start; and

    a second clamp circuit for clamping said control pulse voltage at a circuit power supply potential on the basis of a voltage outputted through said switch device at the time of an end of the start process.

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