Abstract: A power regulator has an input terminal arranged to receive an input voltage, an output terminal arranged to output an output voltage, a transistor connected to the input terminal and to the output terminal, a feedback terminal arranged to receive a feedback voltage having a predetermined relationship with the output voltage, a control circuit configured to control the transistor based on the feedback voltage at the feedback terminal and a reference voltage so as to keep the output voltage constant (equal to a first voltage), and an open detection circuit configured to detect an open state of the feedback terminal and, on detecting the open state, to vary the reference voltage and thereby keep the transistor in an OFF state (or a voltage holding circuit configured to hold the output voltage constant at a second voltage lower than the first voltage when the feedback terminal is in an open state).

Abstract: The present disclosure provides a short circuit protection circuit with small area and less current-consuming. A short circuit protection circuit 14 includes a transistor M11 and a resistor R11, serially connected between a source and a drain of an output transistor 11 (transistor M10); and a transistor M12, connected between the source and a gate of the output transistor 11 and forming a current mirror together with the transistor M11.

Abstract: The present overcurrent protective device comprises an input terminal configured to receive a power supply voltage, an output terminal, a switch, a detector, and a controller. The switch is provided between the input terminal and the output terminal. The detector is configured to output a limitation signal without delay when a current flowing through the switch exceeds a prescribed tolerance value. The controller is configured to receive the limitation signal and control the switch to prevent the current from exceeding the tolerance value. The detector is configured output a turn-off signal to the controller when a first state continues for a delay time determined depending on the current's magnitude. The first state is a state where the current is smaller than the tolerance value and the current exceeds a first threshold value smaller than the tolerance value. The controller turns off the switch in response to the turn-off signal.

Abstract: A power supply circuit includes a transistor disposed between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied, and an error amplifier configured to compare a feedback voltage varied based on the output voltage and a reference voltage, and control the transistor based on a result of the comparison, the reference voltage being generated by selectively using the input voltage or the output voltage.

Abstract: A semiconductor device includes a heat source and a heat detection element which are formed on a semiconductor substrate; and a heat conductive member formed across both of the heat source and the heat detection element, a thermal conductivity of the heat conductive member being higher than a thermal conductivity of the semiconductor substrate, and wherein the heat source, the heat detection element and the heat conductive member are integrated on the semiconductor substrate.

Abstract: The present disclosure provides a short circuit protection circuit with small area and less current-consuming. A short circuit protection circuit 14 includes a transistor M11 and a resistor R11, serially connected between a source and a drain of an output transistor 11 (transistor M10); and a transistor M12, connected between the source and a gate of the output transistor 11 and forming a current mirror together with the transistor M11.

Abstract: A power supply circuit includes a transistor disposed between an input terminal to which an input voltage is applied and an output terminal to which an output voltage is applied, and an error amplifier configured to compare a feedback voltage varied based on the output voltage and a reference voltage, and control the transistor based on a result of the comparison, the reference voltage being generated by selectively using the input voltage or the output voltage.

Abstract: A signal output circuit that can decrease the current consumption while securing the base current of an output transistor of an NPN type bipolar transistor includes an output transistor of the NPN type bipolar transistor, a ground side output control transistor of which turning ON turns OFF the output transistor, a base current supply resistive element for supplying current to the base of the output transistor, a power supply side output control transistor which is disposed between the base current supply resistive element and the base of the output transistor, a ground side current bypass transistor which turns ON and OFF in the same way as the ground side output control transistor according to the input signal so that turning ON allows the current of the base current supply resistive element to flow, and a current limitation resistive element which is disposed between the ground side current bypass transistor and the base current supply resistive element.