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LOW DROP OUT VOLTAGE REGULATO

  • US 20120161734A1
  • Filed: 12/23/2010
  • Published: 06/28/2012
  • Est. Priority Date: 12/23/2010
  • Status: Active Grant
First Claim
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1. A low drop out (LDO) voltage regulator, comprising:

  • an error amplifier, for generating a control voltage according to a first reference voltage and a feedback voltage;

    a power transistor, comprising a gate coupled to the error amplifier and a source coupled to a supply voltage, for generating an output voltage at a drain of the power transistor according to the control voltage;

    a first voltage division unit, coupled between the drain of the power transistor and a ground, for dividing the output voltage to generate the feedback voltage;

    a compensation control unit, coupled between the gate and the drain of the power transistor, for generating a compensation control signal according to the control voltage, the output voltage, and a compensation bias, wherein the compensation bias is inversely proportional to the supply voltage and ambient temperature; and

    a compensation bias current source, coupled to the error amplifier, for supplying a compensation bias current to the LDO voltage regulator according to the compensation control signal.

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