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Disclosed is an integrated circuit which comprises: a constant voltage circuit including a reference voltage generator, a feedback amplifier, a differential amplifier having an input for receiving an output signal of the reference voltage generator as a reference signal and another input for receivi

Disclosed is an integrated circuit which comprises: a constant voltage circuit including a reference voltage generator, a feedback amplifier, a differential amplifier having an input for receiving an output signal of the reference voltage generator as a reference signal and another input for receiving an output of the feedback amplifier as a negative feedback signal, and a monochannel output driver driven in accordance with an output of the differential amplifier; a circuit load connected to an output of the constant voltage circuit; and an MOS transistor connected in parallel to the circuit load and arranged so as to be driven when a heavy load is periodically driven. The MOS transistor is turned on in a heavy load operation to thereby rapidly discharge a charge in the capacitance of the constant voltage circuit and a charge in the capacitance in the circuit load are rapidly discharged so that an output of the feedback amplifier is made to cope with the fluctuation in voltage, whereby the mono-channel output driver in the output stage is properly controlled to suppress the fluctuation in output even when a power source fluctuates.

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An apparatus comprising: an integrated circuit including: a CPU for processing various operations, a constant voltage circuit having a reference voltage generating circuit, a feedback circuit for outputting the voltage applied to a circuit load as the feedback voltage, a differential amplifying circ

An apparatus comprising: an integrated circuit including: a CPU for processing various operations, a constant voltage circuit having a reference voltage generating circuit, a feedback circuit for outputting the voltage applied to a circuit load as the feedback voltage, a differential amplifying circuit for inputting and amplifying the voltage outputted from said reference voltage generating circuit and said feedback voltage and a mono-channel output drive driven by the output from said differential amplifying circuit, said circuit load being connected between both polar terminals of the power source through said mono-channel output driver, an MOS transistor connected in parallel to said circuit load, and a first latch circuit for memorizing instructions and for driving said MOS transistor when a periodic drive for a heavy load is instructed by a said CPU; and a heavy load connected to said integrated circuit and driven in accordance with a control command from said CPU.