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Series regulator and differential amplifier circuit thereof

  • US 20070063686A1
  • Filed: 03/20/2006
  • Published: 03/22/2007
  • Est. Priority Date: 05/16/2005
  • Status: Active Grant
First Claim
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1. A series regulator for supplying a stable output voltage to a load, the series regulator comprising:

  • an output control transistor that supplies the output voltage in accordance with a control signal;

    a voltage divider circuit that divides the output voltage and outputs the divided voltage; and

    a differential amplifier circuit that outputs the control signal to the output control transistor in accordance with a differential voltage of difference between a preset reference voltage and the divided voltage output from the voltage divider circuit, wherein the differential amplifier circuit includes;

    a differential input stage for detecting the differential voltage between the reference voltage and the divided voltage output from the voltage divider circuit; and

    an amplification stage having a MOS transistor and a resistor having a predetermined resistance connected to the gate and the drain of the MOS transistor, and a constant-current circuit connected in series with the MOS transistor, wherein the differential input stage has an output connected to the gate of the MOS transistor, and wherein a connecting part between the MOS transistor and the constant-current circuit serves as an output terminal of the amplification stage.

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