Integrated circuit

An integrated circuit, comprising:

• a first transistor having
• an electrode on a high potential side thereof to receive a predetermined voltage, and
• a control electrode to receive a control voltage, and
• an electrode on a low potential side thereof, the first transistor being configured to send a first current to a load connected to the integrated circuit;
• a second transistor having
• an electrode on a high potential side thereof to receive the predetermined voltage,
• a control electrode to receive the control voltage, and
• an electrode on a low potential side thereof, the second transistor being configured to send a second current corresponding to the first current;
• a third transistor connected between the electrode on the low potential side of the second transistor and a predetermined line;
• an operational amplifier configured to control the third transistor such that a voltage at the electrode on the low potential side of the first transistor and a voltage at the electrode on the low potential side of the second transistor are equal;
• and
• an adder circuit configured to add a fourth current to the second current, in response to a predetermined condition being satisfied.

An integrated circuit, comprising:

• a first transistor having
• an electrode on a high potential side thereof to receive a predetermined voltage, and
• a control electrode to receive a control voltage, and
• an electrode on a low potential side thereof, the first transistor being configured to send a first current to a load connected to the integrated circuit;
• a second transistor having
• an electrode on a high potential side thereof to receive the predetermined voltage, and
• a control electrode to receive the control voltage, and
• an electrode on a low potential side thereof, the second transistor being configured to send a second current corresponding to the first current;
• a third transistor connected between the electrode on the low potential side of the second transistor and a predetermined line;
• an operational amplifier configured to control the third transistor such that a voltage at the electrode on the low potential side of the first transistor and a voltage at the electrode on the low potential side of the second transistor are equal;
• and
• another transistor connected to the electrode on the low potential side of the second transistor, said another transistor being configured to be controlled by the operational amplifier together with the third transistor;
• a bias current source configured to generate a bias current corresponding to a current flowing through said another transistor;
• and
• an overcurrent detection circuit configured to detect whether the first current is an overcurrent, based on the bias current.