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Semiconductor integrated circuit device and method of regulating output voltage thereof

  • US 9,791,873 B2
  • Filed: 07/22/2015
  • Issued: 10/17/2017
  • Est. Priority Date: 07/31/2014
  • Status: Active Grant
First Claim
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1. A semiconductor integrated circuit device comprising:

  • a PMOS output element having a source electrode connected to a power supply terminal and a drain electrode connected to an output voltage terminal from which an output voltage is supplied;

    a voltage dividing circuit having resistors for dividing the supplied output voltage to produce a divided voltage;

    a reference voltage circuit for generating a reference voltage and having a memory element whose threshold voltage determines the reference voltage directly output from the reference voltage circuit, the reference voltage circuit having a regulating input terminal which is connected to the memory element and which receives an input signal proportional to a measured value of the reference voltage output from the reference voltage circuit to change the threshold voltage of the memory element to thereby change the value of the reference voltage; and

    an error amplifier to which the divided voltage and the reference voltage are supplied to generate a voltage applied to a gate electrode of the PMOS output element, the voltage being amplified depending on a difference between the divided voltage and the reference voltage.

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