| 摘要 |
There is disclosed a voltage control circuit for a semiconductor apparatus for controlling an output voltage to be applied from an external voltage source to a load circuit of the semiconductor apparatus therethrough. A reference voltage generator generates a predetermined reference voltage according to a source voltage outputted from an external voltage source, and an error amplifier compares the output voltage with the reference voltage, and outputs a comparison signal for representing the comparison result thereof. A voltage controller controls the output voltage according to the comparison signal. Further, a diode circuit which is connected in parallel with the voltage controller applies the source voltage to the load circuit in a forward direction thereof. Furthermore, a first switching device enables the reference voltage generator, the error amplifier and the voltage controlled in response to a first control signal outputted from an external circuit, and for disabling the reference voltage generator, the error amplifier and the voltage controller in response to a second control signal outputted from the external circuit. Also, a second switching device enables the diode circuit in response to the second control signal, and for disabling the diode circuit in response to the first control signal.
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