Patent ID: 7656624

Claim:
An IC power protection circuit which supplies power to an integrated circuit whose withstand voltage is lower than a supply voltage supplied from the outside, the IC power protection circuit comprising: an error amplification circuit which is positioned in an integrated manner within the integrated circuit, and includes a voltage division section for dividing a voltage applied to a power supply terminal of the integrated circuit and an error amplifier for amplifying a difference between an output from the voltage division section and a reference voltage; a voltage control transistor which conducts depending on an output from the error amplifier, adjusts a voltage supplied from an external power source, and supplies the adjusted voltage to the integrated circuit; and an output terminal protection voltage limiting section which limits the voltage applied to an output terminal of the error amplifier to a voltage not higher than the withstand voltage of the integrated circuit; wherein a power source of the error amplification circuit is a voltage adjusted by the voltage control transistor.