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Low-dropout voltage regulator with level limiter limiting level of output voltage when level of load current changes and method of operating the same

  • US 8,040,118 B2
  • Filed: 12/10/2009
  • Issued: 10/18/2011
  • Est. Priority Date: 12/24/2008
  • Status: Active Grant
First Claim
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1. A low-dropout (LDO) voltage regulator comprising:

  • an error amplifier which compares a reference voltage with a feedback voltage of an output voltage and outputs an error signal based on the result of the comparison, the error amplifier being biased by an input voltage;

    a first MOS transistor having a gate electrically connected to the error signal, a source electrically connected to the input voltage and a drain electrically connected to the output voltage;

    a voltage divider which transmits a predetermined part of the output voltage to the error amplifier as feedback voltage; and

    a level limiter which limits a level of the output voltage from changing beyond and below an offset voltage when a level of a load current changes,wherein the level limiter comprises;

    a decrease limiter which limits the output voltage from decreasing below a low point of the offset voltage when the load current increases; and

    an increase limiter which limits the output voltage from increasing beyond a high point of the offset voltage when the load current decreases.

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