×

VOLTAGE REGULATOR

  • US 20110062921A1
  • Filed: 09/15/2009
  • Published: 03/17/2011
  • Est. Priority Date: 09/15/2009
  • Status: Active Grant
First Claim
Patent Images

1. A voltage regulator, comprising:

  • an output transistor that is provided between a power supply terminal and an output terminal;

    an error amplifier for controlling a gate voltage of the output transistor so that a voltage of the output terminal becomes constant;

    a second transistor for connecting a substrate of the output transistor with the power supply terminal;

    a third transistor for connecting the substrate of the output transistor with the output terminal; and

    a comparator circuit for comparing a voltage of the power supply terminal with the voltage of the output terminal, and performing control of switching the second transistor and the third transistor based on a result of the comparing, wherein;

    the comparator circuit comprises;

    a fourth transistor having a source connected with the power supply terminal, a gate connected with a drain, and the drain connected with a first constant current circuit; and

    a fifth transistor having a source connected with the output terminal, a gate connected with the gate of the fourth transistor, and a drain connected with a second constant current circuit; and

    the comparator circuit outputs the result of the comparing based on a voltage of a connection point between the fifth transistor and the second constant current circuit.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×