Patent ID: 8848328

Claim:
A load driving device comprising: an output transistor coupled between a first power supply line and an output terminal, the output terminal being configured to be coupled with a load; a protection transistor that is provided between a gate of the output transistor and a second power supply line, and brings the output transistor into a conduction state when a polarity of a power supply coupled between the first power supply line and the second power supply line is reversed; and a back gate control circuit that comprises a transistor comprising a gate coupled to the first power supply line and being coupled between the second power supply line and a back gate of the protection transistor, the back gate control circuit providing a conductive path between the second power supply line and the back gate of the protection transistor via the transistor when the polarity of the power supply is normal, wherein the gate of the transistor is coupled to the first power supply line directly via a connection node located in a connecting line that couples the first power supply line and the output transistor.