Semiconductor device for supplying stable voltage to control electrode of transistor

A semiconductor device comprising:

• a first terminal;
• a first internal voltage generator circuit which comprises a first transistor including a first control electrode and first and second main electrodes, a first control circuit controlling a first bias voltage across the first control electrode and the first main electrode of the first transistor such that the second main electrode of the first transistor maintains a first reference voltage, and a second transistor including a second control electrode and a third main electrode controlled by the first bias voltage thereacross and a fourth electrode from which a first internal voltage is derived;
• a second internal voltage generator circuit which comprises a third transistor including a third control electrode and fifth and sixth main electrodes, a second control circuit controlling a second bias voltage across the third control electrode and the fifth main electrode of the third transistor such that the sixth main electrode of the third transistor maintains a second reference voltage, and a fourth transistor including fourth control electrode and a seventh main electrode controlled by the second bias voltage thereacross and a eighth electrode from which a second internal voltage is derived;
• a first switch provided between the first terminal and the first internal voltage generator circuit to control supplying the first terminal with the first internal voltage;
• and
• a second switch provided between the first terminal and the second internal voltage generator circuit to control supplying the first terminal with the second internal voltage.