Patent ID: 11929605
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 0:
1. A semiconductor device comprising:
a first power supply terminal receiving a first power supply voltage;
a second power supply terminal receiving a second power supply voltage lower than the first power supply voltage;
a first output transistor connected between the first power supply terminal and an output node, the first output transistor allowing current in accordance with a first control voltage to flow from the first power supply terminal to the output node;
a second output transistor connected between the output node and the second power supply terminal, the second output transistor allowing current in accordance with a second control voltage to flow from the output node to the second power supply terminal;
an output terminal electrically connected to the output node, the output terminal being capable of electrical contact from outside of the semiconductor device;
a disconnection detection circuit to detect at least one of first disconnection in an input path of the first power supply voltage to the first power supply terminal and second disconnection in an input path of the second power supply voltage to the second power supply terminal; and
an output transistor control circuit arranged corresponding to at least one of the first and second output transistors, wherein
the first output transistor has a conductivity type to turn off when the first power supply voltage is input to a gate,
the second output transistor has a conductivity type to turn off when the second power supply voltage is input to a gate,
the output transistor control circuit arranged corresponding to the first output transistor inputs a voltage at the output terminal to the gate of the first output transistor at a time of occurrence of the first disconnection,
the output transistor control circuit arranged corresponding to the second output transistor inputs a voltage at the output terminal to the gate of the second output transistor at a time of occurrence of the second disconnection,
of the first and second output transistors, the output transistor for which the output transistor control circuit is arranged includes two transistors of a same conductivity type connected in series, and
the two transistors have back gate terminals connected in common to a connection node of the two transistors.