Power supply semiconductor integrated circuit including a short-circuit-fault detection circuit that detects a short circuit of the voltage-output terminal

A power supply semiconductor integrated circuit comprising:

• an output transistor connected between a voltage-input terminal to which a DC voltage is input and a voltage-output terminal;
• a control circuit that controls the output transistor based on a feedback voltage of an output voltage;
• a current limit circuit that limits an output current of the output transistor such that the output current is not equal to or greater than a predetermined current limit;
• a first transistor, the first transistor and the output transistor constituting a current mirror circuit;
• a short-circuit-fault detection circuit that detects a short circuit of the voltage-output terminal based on a voltage across a resistor element connected in series to the first transistor;
• a first output terminal that outputs a detection result of the short-circuit-fault detection circuit to outside;
• a second transistor, the second transistor and the output transistor constituting a current mirror circuit;
• an open-circuit-fault detection circuit that detects an open circuit of the voltage-output terminal based on a voltage across a resistor element connected in series to the second transistor;
• a second output terminal that outputs a detection result of the open-circuit-fault detection circuit to outside;
• and
• a thermal shutdown circuit that stops operation of the control circuit in response to detecting a temperature equal to or higher than a predetermined temperature, wherein
• the first output terminal outputs a signal indicating a fault, based on a signal indicating a logical sum of a signal output by the thermal shutdown circuit and a signal output by the short-circuit-fault detection circuit, and
• the second output terminal outputs a signal indicating a logical sum of the signal output by the thermal shutdown circuit and a signal output by the open-circuit-fault detection circuit.