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

Claim 5:
6. 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; and
a switch circuit including at least one of a first switch transistor of a first conductivity type and a second switch transistor of a second conductivity type, wherein
the first switch transistor is inserted and connected in a first path from the first power supply terminal to the output terminal via a body diode of the first output transistor and the output node, and
the second switch transistor is inserted and connected in a second path from the second power supply terminal to the output terminal via a body diode of the second output transistor and the output node,
the semiconductor device further comprising
a disconnection detection circuit to generate at least one of a first reference voltage to control ON and OFF of the first switch transistor and a second reference voltage to control ON and OFF of the second switch transistor, wherein
the first reference voltage is generated to turn on the first switch transistor at a time of non-occurrence of first disconnection in an input path of the first power supply voltage to the first power supply terminal and to turn off the first switch transistor at a time of occurrence of the first disconnection, and
the second reference voltage is generated to turn on the second switch transistor at a time of non-occurrence of second disconnection in an input path of the second power supply voltage to the second power supply terminal and to turn off the second switch transistor at a time of occurrence of the second disconnection.