Patent ID: 9559098
Date: 2017-01-31
CPC Classifications: H01L,H02M

Claim:
1. A semiconductor device comprising: an output stage switching element configured to control a current in a load having a mutual inductance; a detection circuit configured to detect an abnormality of the output stage switching element; a logic circuit configured to make a determination with respect to a state of the output stage switching element using an output of the detection circuit; a status detection circuit configured to output a status of a connection between the load and the output stage switching element and a result of the determination made by the logic circuit to a state outputting terminal; and a voltage dividing diode connected in series to the status detection circuit, a cathode of the voltage dividing diode being connected to the status detection circuit, and an anode of the voltage dividing diode being connected to a ground, wherein: a first potential side of the output stage switching element is connected to an output terminal of a control circuit of the semiconductor device, a first end of the load is connected to the output terminal, and a second end of the load is connected to a first potential side of a power supply, a second potential side of the power supply being connected to the ground, the output stage switching element is formed in a semiconductor layer of a second conduction type with the semiconductor layer taken as being on the first potential side of the output stage switching element, the detection circuit and the logic circuit are formed in a first well region of a first conduction type in the semiconductor layer, the status detection circuit comprises a lateral MOSFET of the second conduction type formed in a second well region of the first conduction type, the second well region being formed in the semiconductor layer at a distance from the first well region of the first conduction type, each of the first well region of the first conduction type and the second potential side of the output stage switching element is connected to the ground, the second well region of the first conduction type forms a back gate of the lateral MOSFET of the second conduction type, the back gate having the cathode of the voltage dividing diode connected thereto to connect the second well region of the first conduction type to the ground through the anode of the voltage dividing diode, and the semiconductor layer formed as being on the first potential side of the output stage switching element is connected to the first potential side of the power supply through the load connected to the output terminal of the control circuit.