| 摘要 |
A semiconductor integrated device includes transistor between input and output terminals, an amplifying device, and a control circuit that activates or deactivates the amplifying device according to an input voltage. When the input voltage is higher than a specified value, the control circuit activates the amplifying device to regulate a monitoring voltage to a value equal to a reference voltage, and outputs a control voltage to act on the gate of the transistor. When the input voltage is lower than the specified value, the control circuit deactivates the amplifying device so that a predetermined gate voltage is applied to the gate of the transistor.
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