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Dual-loop voltage regulator architecture with high DC accuracy and fast response time

  • US 8,841,893 B2
  • Filed: 08/19/2011
  • Issued: 09/23/2014
  • Est. Priority Date: 12/16/2010
  • Status: Active Grant
First Claim
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1. A voltage regulator circuit, comprising:

  • an error amplifier to compare a first reference voltage and a regulated voltage at an output node of the voltage regulator circuit, and to generate a first control current and a second control current based on a result of comparing the first reference voltage and the regulated voltage;

    a charge pump circuit, connected to an output of the error amplifier, to dynamically generate a second reference voltage in response to the first and second control currents generated by the error amplifier;

    a comparator to compare the second reference voltage and the regulated voltage and generate a gate control signal based on a result of comparing the second reference voltage and the regulated voltage; and

    a first passgate device connected to the output node, wherein the first passgate device is controlled by the gate control signal to be fully turned on/off in a bang-bang mode of operation to supply current to the output node.

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