Abstract: A voltage generation circuit generates a first current having a first temperature-dependent characteristic in which a current value thereof changes with a predetermined change in temperature, and a second current having a second temperature-dependent characteristic different from the first temperature-dependent characteristic. The voltage generation circuit includes a first variable resistor and a second variable resistor connected in series. The second current flows through the first variable resistor, and a third current having a current value that is based on a difference between a current value of the first current and a current value of the second current, flows through the second variable resistor.

Abstract: A current detection circuit includes an N-type first transistor configured to supply a first current to an output terminal, an N-type second transistor that constitutes a current mirror circuit with the first transistor, a comparison circuit configured to output a detection result showing whether or not the first current is larger than a predetermined threshold based on a current flowing through the second transistor, a ground fault detection circuit configured to output a result detecting a ground fault of the output terminal, and a logical circuit configured to output a current detection signal showing whether or not the first current is an overcurrent based on the detection result of the comparison circuit and the ground fault detection result of the ground fault detection circuit.

Abstract: An amplifier circuit includes, a first transistor and a first resistor connected in series between a power supply voltage and an output terminal. A second transistor and a second resistor are connected in series between the output terminal and a ground reference voltage. There is a first operational amplifier and a second operational amplifier. A first detection current corresponding to a voltage drop across first resistor is generated. A second detection current corresponding to a voltage drop across the second resistor is generated. A first replication circuit subtracts the second detection current from the first detection current. A third resistor conducts the current obtained by subtracting the second detection current from the first detection current.

Abstract: An amplifier circuit includes, a first transistor and a first resistor connected in series between a power supply voltage and an output terminal. A second transistor and a second resistor are connected in series between the output terminal and a ground reference voltage. There is a first operational amplifier and a second operational amplifier. A first detection current corresponding to a voltage drop across first resistor is generated. A second detection current corresponding to a voltage drop across the second resistor is generated. A first replication circuit subtracts the second detection current from the first detection current. A third resistor conducts the current obtained by subtracting the second detection current from the first detection current.

Abstract: A current detection circuit includes an N-type first transistor configured to supply a first current to an output terminal, an N-type second transistor that constitutes a current mirror circuit with the first transistor, a comparison circuit configured to output a detection result showing whether or not the first current is larger than a predetermined threshold based on a current flowing through the second transistor, a ground fault detection circuit configured to output a result detecting a ground fault of the output terminal, and a logical circuit configured to output a current detection signal showing whether or not the first current is an overcurrent based on the detection result of the comparison circuit and the ground fault detection result of the ground fault detection circuit.

Abstract: The voltage regulator includes a resistor circuit that switches between a first state and a second state according to the comparison result signal. In the first state, a resistance between a second end of a first controlling transistor and a fixed potential is set at a first resistance, and a second end of a second controlling transistor and the fixed potential are disconnected from each other. In the second state, the second end of the first controlling transistor and the fixed potential are disconnected from each other, and a resistance between the second end of the second controlling transistor and the fixed potential is set at a second resistance.

Abstract: The voltage regulator includes a resistor circuit that switches between a first state and a second state according to the comparison result signal. In the first state, a resistance between a second end of a first controlling transistor and a fixed potential is set at a first resistance, and a second end of a second controlling transistor and the fixed potential are disconnected from each other. In the second state, the second end of the first controlling transistor and the fixed potential are disconnected from each other, and a resistance between the second end of the second controlling transistor and the fixed potential is set at a second resistance.