Abstract: A power-supply apparatus according to an aspect includes an inductor, a transistor that supplies, in an on-state, a current to the input side of the inductor, a second transistor that becomes, when the first transistor is in an off-state, an on-state and thereby brings the input side of the inductor to a predetermined potential, a signal generation unit that generates voltage signals corresponding to a current flowing to the inductor, an amplifier that outputs a current according to the voltage signals, a converter that converts the current output from the amplifier into a voltage signal, and a control unit that controls the transistors based on a first feedback signal corresponding to the voltage on the output side of the inductor and the voltage signal, which is used as a second feedback signal.

Abstract: A semiconductor device is improved in reliability. A power MOSFET for switching, and a sense MOSFET for sensing a current flowing in the power MOSFET, which is smaller in area than the power MOSFET, are formed in one semiconductor chip. The semiconductor chip is mounted over a chip mounting portion, and sealed in a resin. To first and second source pads for outputting the current flowing in the power MOSFET, a metal plate is bonded. A third source pad for sensing the source voltage of the power MOSFET is at a position not overlapping the metal plate. A coupled portion between a source wire forming the third pad and another source wire forming the first and second pads is at a position overlapping the metal plate.

Abstract: A power-supply apparatus according to an aspect includes an inductor, a transistor that supplies, in an on-state, a current to the input side of the inductor, a second transistor that becomes, when the first transistor is in an off-state, an on-state and thereby brings the input side of the inductor to a predetermined potential, a signal generation unit that generates voltage signals corresponding to a current flowing to the inductor, an amplifier that outputs a current according to the voltage signals, a converter that converts the current output from the amplifier into a voltage signal, and a control unit that controls the transistors based on a first feedback signal corresponding to the voltage on the output side of the inductor and the voltage signal, which is used as a second feedback signal.

Abstract: A power-supply apparatus according to an aspect includes an inductor, a transistor that supplies, in an on-state, a current to the input side of the inductor, a second transistor that becomes, when the first transistor is in an off-state, an on-state and thereby brings the input side of the inductor to a predetermined potential, a signal generation unit that generates voltage signals corresponding to a current flowing to the inductor, an amplifier that outputs a current according to the voltage signals, a converter that converts the current output from the amplifier into a voltage signal, and a control unit that controls the transistors based on a first feedback signal corresponding to the voltage on the output side of the inductor and the voltage signal, which is used as a second feedback signal.

Abstract: A power-supply apparatus according to an aspect includes an inductor, a transistor that supplies, in an on-state, a current to the input side of the inductor, a second transistor that becomes, when the first transistor is in an off-state, an on-state and thereby brings the input side of the inductor to a predetermined potential, a signal generation unit that generates voltage signals corresponding to a current flowing to the inductor, an amplifier that outputs a current according to the voltage signals, a converter that converts the current output from the amplifier into a voltage signal, and a control unit that controls the transistors based on a first feedback signal corresponding to the voltage on the output side of the inductor and the voltage signal, which is used as a second feedback signal.

Abstract: Miniaturization of a multiphase type power supply device can be achieved. A power supply control unit in which, for example, a microcontroller unit, a memory unit and an analog controller unit are formed over a single chip, a plurality of PWM-equipped drive units, and a plurality of inductors configure a multiphase power supply. The microcontroller unit outputs clock signals each having a frequency and a phase defined based on a program on the memory unit to the respective PWM-equipped drive units. The analog controller unit detects a difference between a voltage value of a load and a target voltage value acquired via a serial interface and outputs an error amp signal therefrom. Each of the PWM-equipped drive units drives each inductor by a peak current control system using the clock signal and the error amp signal.

Abstract: Miniaturization of a multiphase type power supply device can be achieved. A power supply control unit in which, for example, a microcontroller unit, a memory unit and an analog controller unit are formed over a single chip, a plurality of PWM-equipped drive units, and a plurality of inductors configure a multiphase power supply. The microcontroller unit outputs clock signals each having a frequency and a phase defined based on a program on the memory unit to the respective PWM-equipped drive units. The analog controller unit detects a difference between a voltage value of a load and a target voltage value acquired via a serial interface and outputs an error amp signal therefrom. Each of the PWM-equipped drive units drives each inductor by a peak current control system using the clock signal and the error amp signal.

Abstract: A voltage regulator has a voltage converter circuit and a control unit. The control unit controls the voltage converter circuit so that an output voltage attains a target voltage when the voltage regulator is in a no-load condition so as to have a transition characteristic in which the output voltage decreases with increase in the load current. The control unit calculates deviation between the output voltage and an ideal value thereof when a load condition of the voltage regulator is a first load condition, and corrects the target voltage by the output voltage adjustment unit. so The control unit also calculates deviation between rate of change of the output voltage with respect to the load current and an ideal value thereof, and corrects the transition characteristic so that the deviation becomes small to minimize deviation.

Abstract: To improve reliability of a semiconductor device A power MOSFET for switching and a sense MOSFET having an area smaller than that of the power MOSFET and configured to detect an electric current flowing through the power MOSFET are formed within one semiconductor chip CPH and the semiconductor chip CPH is mounted over a chip mounting part via an electrically conductive joining material and sealed with a resin. In a main surface of the semiconductor chip CPH, a sense MOSFET region in which the sense MOSFET is formed is located more internally than a source pad PDHS4 of the sense MOSFET region RG2. Furthermore, in the main surface of the semiconductor chip, the sense MOSFET region RG2 is surrounded by a region in which the power MOSFET is formed.

Abstract: A semiconductor device is improved in reliability. A power MOSFET for switching, and a sense MOSFET for sensing a current flowing in the power MOSFET, which is smaller in area than the power MOSFET, are formed in one semiconductor chip. The semiconductor chip is mounted over a chip mounting portion, and sealed in a resin. To first and second source pads for outputting the current flowing in the power MOSFET, a metal plate is bonded. A third source pad for sensing the source voltage of the power MOSFET is at a position not overlapping the metal plate. A coupled portion between a source wire forming the third pad and another source wire forming the first and second pads is at a position overlapping the metal plate.

Abstract: A power MOSFET for switching and a sense MOSFET having an area smaller than that of the power MOSFET and configured to detect an electric current flowing through the power MOSFET are formed within one semiconductor chip CPH and the semiconductor chip CPH is mounted over a chip mounting part via an electrically conductive joining material and sealed with a resin. In a main surface of the semiconductor chip CPH, a sense MOSFET region in which the sense MOSFET is formed is located more internally than a source pad PDHS4 of the sense MOSFET region RG2. Furthermore, in the main surface of the semiconductor chip, the sense MOSFET region RG2 is surrounded by a region in which the power MOSFET is formed.

Abstract: Miniaturization of a multiphase type power supply device can be achieved. A power supply control unit in which, for example, a microcontroller unit, a memory unit and an analog controller unit are formed over a single chip, a plurality of PWM-equipped drive units, and a plurality of inductors configure a multiphase power supply. The microcontroller unit outputs clock signals each having a frequency and a phase defined based on a program on the memory unit to the respective PWM-equipped drive units. The analog controller unit detects a difference between a voltage value of a load and a target voltage value acquired via a serial interface and outputs an error amp signal therefrom. Each of the PWM-equipped drive units drives each inductor by a peak current control system using the clock signal and the error amp signal.

Abstract: A charge pump circuit generates a desired output voltage by stepping up an input voltage. An LCD driver IC and an electronic appliance are provided with the charge pump circuit.

Abstract: A charge pump circuit 31a of the present invention includes: a step-up capacitor Cc2 charged and discharged in repeated cycles; a charger (SW2a to SW2c) that makes a first end T2a of the step-up capacitor Cc2 conduct to an input voltage VR application terminal and makes a second end T2b of the step-up capacitor Cc2 conduct to a ground terminal GND; a first discharger (SW3a and SW3b) that makes the first end T2a of the step-up capacitor Cc2 conduct to a positive voltage output terminal T3 and makes T2b conduct to VR; a second discharger (SW4a and SW4b) that makes T2a conduct to GND and makes T2b conduct to a negative voltage output terminal T4; a first output capacitor Co1 connected to T3, and a second output capacitor Co2 connected to T4. Each time charging of the step-up capacitor is completed, outputting of a positive voltage by the first discharger and outputting of a negative voltage by the second discharger are alternated.