Importance

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Abstract

A bootstrap circuit includes an N-channel MOS transistor including: a first N-type semiconductor layer formed on a surface of a P-type semiconductor substrate and electrically connected to a bootstrap capacitor; a P-type semiconductor layer formed on a surface of the first N-type semiconductor layer; a second N-type semiconductor layer formed on a surface of the P-type semiconductor layer; a first electrode electrically connected to the P-type semiconductor layer; a second electrode electrically connected to the second N-type semiconductor layer; and a power-source terminal connected to each of the first electrode and the second electrode for supplying a power-source voltage thereto, the N-channel MOS transistor supplying power to the bootstrap capacitor, and a current limiting element connected between the power-source terminal and the first electrode.

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First Claim