Megachips Corporation

Yuta Yamada

Takashi Ikeda

There is provided a to-be-protection circuit that is high in operation accuracy and that prevents overvoltage on a protected circuit. A protection circuit is configured to protect a to-be-protected circuit from overvoltage. The to-be-protected circuit is connected to an external output terminal. The protection circuit includes: a current path unit connected to the external output terminal and including at least one first element; a reference voltage generation unit which generates and outputs a reference voltage; and an amplifier circuit outputs a target voltage based on a difference between a first input voltage and a second input voltage. The amplifier circuit operates using the reference voltage as the first input voltage and using a feedback voltage based on the target voltage as the second input voltage, and outputs the target voltage to the current path unit. The reference voltage generation unit includes at least one second element having an operating characteristic corresponding to an operating characteristic of the at least one first element of the current path unit, and generates the reference voltage based on a voltage drop caused by the at least one second element.

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Chiba, Japan

Yuta Yamada