Abstract: A semiconductor apparatus that constitutes a step-down type switching regulator is disclosed. The semiconductor apparatus includes a switching transistor, an inductor, a transistor for rectification, and a transistor for synchronous rectification. The transistor for rectification is connected between a connecting point where the switching transistor and the inductor L1 are connected and ground potential; and a gate of this transistor is connected to the connecting point. The transistor for synchronous rectification is connected parallel to the transistor for rectification. A control signal is provided to a gate of the transistor for synchronous rectification so that a switching operation that is opposite to an operation of the switching transistor may be performed. The transistor for synchronous rectification is arranged closer to the connecting point than the transistor for rectification.

Abstract: A constant voltage circuit is disclosed that includes an output voltage control transistor outputting a current to an output terminal; a first error amplifier circuit part controlling the operation of the output voltage control transistor; a second error amplifier circuit part causing the output voltage control transistor to increase the output current when there is a rapid decrease in an output voltage from the output terminal; and a current limiting circuit part controlling the operation of the output voltage control transistor so as to prevent the output current therefrom from exceeding a first predetermined value by gradually decreasing the output current and the output voltage alternately when the output current is greater than or equal to the first predetermined value. The current limiting circuit part stops the operation of the second error amplifier circuit part when the output voltage is less than or equal to a second predetermined value.

Abstract: A semiconductor apparatus is disclosed. The semiconductor apparatus comprises a substrate with a pad, an internal circuitry region, and a protection resistance formed on the substrate. The pad is connected to a first electrode of the protection resistance by wiring, the internal circuitry region is connected to a second electrode of the protection resistance by wiring, and the protection resistance protects the internal circuitry region from electrostatic discharging. The semiconductor apparatus is characterized in that the pad is placed between the protection resistance and the internal circuitry region.

Abstract: A semiconductor apparatus that constitutes a step-down type switching regulator is disclosed. The semiconductor apparatus includes a switching transistor, an inductor, a transistor for rectification, and a transistor for synchronous rectification. The transistor for rectification is connected between a connecting point where the switching transistor and the inductor L1 are connected and ground potential; and a gate of this transistor is connected to the connecting point. The transistor for synchronous rectification is connected parallel to the transistor for rectification. A control signal is provided to a gate of the transistor for synchronous rectification so that a switching operation that is opposite to an operation of the switching transistor may be performed. The transistor for synchronous rectification is arranged closer to the connecting point than the transistor for rectification.

Abstract: A semiconductor apparatus is disclosed. The semiconductor apparatus comprises a substrate with a pad, an internal circuitry region, and a protection resistance formed on the substrate. The pad is connected to a first electrode of the protection resistance by wiring, the internal circuitry region is connected to a second electrode of the protection resistance by wiring, and the protection resistance protects the internal circuitry region from electrostatic discharging. The semiconductor apparatus is characterized in that the pad is placed between the protection resistance and the internal circuitry region.

Abstract: A constant voltage circuit is disclosed that includes an output voltage control transistor outputting a current to an output terminal; a first error amplifier circuit part controlling the operation of the output voltage control transistor; a second error amplifier circuit part causing the output voltage control transistor to increase the output current when there is a rapid decrease in an output voltage from the output terminal; and a current limiting circuit part controlling the operation of the output voltage control transistor so as to prevent the output current therefrom from exceeding a first predetermined value by gradually decreasing the output current and the output voltage alternately when the output current is greater than or equal to the first predetermined value. The current limiting circuit part stops the operation of the second error amplifier circuit part when the output voltage is less than or equal to a second predetermined value.