Abstract: This semiconductor device comprises: an n-type semiconductor substrate which is connected to an output terminal; a first p-type well which is formed in the n-type semiconductor substrate; a first n-type semiconductor region which is formed in the first p-type well and is connected to a control terminal; and a potential separation part which is connected between the first p-type well and a ground terminal. The potential separation part sets the first p-type well and the ground terminal to a same potential when the output terminal is held at a higher potential than the ground terminal, and sets the first p-type well and the output terminal to a same potential when the output terminal is held at a lower potential than the ground terminal.

Abstract: An overheat protection circuit has an NPN transistor, a power terminal to which a supply voltage is applied, a transmission path by which the supply voltage is transmitted from the power terminal to the collector of the NPN transistor without passing through a current source, and an output voltage generator that generates an output voltage commensurate with the base-emitter voltage of the NPN transistor.

Abstract: This semiconductor device comprises: an n-type semiconductor substrate which is connected to an output terminal; a first p-type well which is formed in the n-type semiconductor substrate; a first n-type semiconductor region which is formed in the first p-type well and is connected to a control terminal; and a potential separation part which is connected between the first p-type well and a ground terminal. The potential separation part sets the first p-type well and the ground terminal to a same potential when the output terminal is held at a higher potential than the ground terminal, and sets the first p-type well and the output terminal to a same potential when the output terminal is held at a lower potential than the ground terminal.

Abstract: A motor driving device of the present invention includes: a driver that receives supply of a power supply voltage to apply a plurality of phase voltages to a motor; a voltage-division phase voltage generation portion that divides each of the phase voltages to generate a plurality of voltage-division phase voltages; a neutral point voltage generation portion that combines and divides the phase voltages to generate a neutral point voltage; a selector that outputs any one of the voltage-division phase voltages as a selection voltage-division phase voltage; a comparator that compares the selection voltage-division phase voltage and the neutral point voltage to generate a comparison signal; and a controller that generates a selection control signal of the selector and an energization control signal of the driver according to the comparison signal.

Abstract: An overheat protection circuit has an NPN transistor, a power terminal to which a supply voltage is applied, a transmission path by which the supply voltage is transmitted from the power terminal to the collector of the NPN transistor without passing through a current source, and an output voltage generator that generates an output voltage commensurate with the base-emitter voltage of the NPN transistor.

Abstract: A semiconductor device has a first chip and a second chip sealed in a single package. The first chip includes a regulator which generates an internal voltage from a supply voltage, a reset circuit which monitors the supply voltage and the internal voltage to generate a reset signal, and a controlled circuit which operates by being supplied with the supply voltage. The second chip includes a controlling circuit which generates a control signal for the controlled circuit by being supplied with the internal voltage. The reset signal is fed to both the controlling circuit and the controlled circuit.

Abstract: A semiconductor device has a first chip and a second chip sealed in a single package. The first chip includes a regulator which generates an internal voltage from a supply voltage, a reset circuit which monitors the supply voltage and the internal voltage to generate a reset signal, and a controlled circuit which operates by being supplied with the supply voltage. The second chip includes a controlling circuit which generates a control signal for the controlled circuit by being supplied with the internal voltage. The reset signal is fed to both the controlling circuit and the controlled circuit.

Abstract: A motor driving device of the present invention includes: a driver that receives supply of a power supply voltage to apply a plurality of phase voltages to a motor; a voltage-division phase voltage generation portion that divides each of the phase voltages to generate a plurality of voltage-division phase voltages; a neutral point voltage generation portion that combines and divides the phase voltages to generate a neutral point voltage; a selector that outputs any one of the voltage-division phase voltages as a selection voltage-division phase voltage; a comparator that compares the selection voltage-division phase voltage and the neutral point voltage to generate a comparison signal; and a controller that generates a selection control signal of the selector and an energization control signal of the driver according to the comparison signal.

Abstract: A comparator is provided, which compares an input voltage and a reference voltage by using a plurality of inverting circuits connected in series. The comparator includes a first inverting circuit, a second inverting circuit, a feedback path, and a capacitor arranged on the feedback path. The first inverting circuit inverts a difference between the input voltage and the reference voltage for output. The second inverting circuit further inverts the output of the first inverting circuit for output. The feedback path feeds back the output of the second inverting circuit to the input side of the first inverting circuit. The capacitor causes hysteresis such that an increasing threshold and a decreasing threshold of the second inverting circuit corresponding to an increase and a decrease of the input voltage have a difference therebetween.

Abstract: A comparator is provided, which compares an input voltage and a reference voltage by using a plurality of inverting circuits connected in series. The comparator includes a first inverting circuit, a second inverting circuit, a feedback path, and a capacitor arranged on the feedback path. The first inverting circuit inverts a difference between the input voltage and the reference voltage for output. The second inverting circuit further inverts the output of the first inverting circuit for output. The feedback path feeds back the output of the second inverting circuit to the input side of the first inverting circuit. The capacitor causes hysteresis such that an increasing threshold and a decreasing threshold of the second inverting circuit corresponding to an increase and a decrease of the input voltage have a difference therebetween.