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LOW DROPOUT REGULATOR

  • US 20110156674A1
  • Filed: 05/24/2010
  • Published: 06/30/2011
  • Est. Priority Date: 12/31/2009
  • Status: Active Grant
First Claim
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1. A low dropout regulator, converting an input voltage to an output voltage to drive a load, comprisinga power transistor, having a power terminal, a control terminal and an output terminal, wherein the power terminal receives the input voltage;

  • a current-voltage converting circuit, coupled to the output terminal of the power transistor to convert a received current to the output voltage;

    a current variation sensing circuit, having an input terminal coupled to the power transistor, and having a first output terminal and a second output terminal, and generating a first voltage variation and a second voltage variation at the first and the second output terminals, respectively, wherein the first and second voltage variations am generated according to a current variation of the power transistor and are of different transition speeds; and

    a compensating circuit, controlling the control terminal of the power transistor according to a first voltage difference between a feedback of the output voltage and a reference voltage and a second voltage difference between the second and the first output terminals of the current variation sensing circuit.

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