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LOW-TO-MEDIUM POWER SINGLE CHIP DIGITAL CONTROLLED DC-DC REGULATOR FOR POINT-OF-LOAD APPLICATIONS

  • US 20120153917A1
  • Filed: 12/20/2011
  • Published: 06/21/2012
  • Est. Priority Date: 12/20/2010
  • Status: Active Grant
First Claim
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1. A DC-DC converter configured to generate a DC output voltage, the DC-DC converter comprising:

  • a digitally controlled pulse width modulator configured to control a switching power stage to supply a varying voltage to an inductor; and

    a digital voltage feedback circuit configured to control the digitally controlled pulse width modulator in accordance with a feedback voltage corresponding to the DC output voltage, the digital voltage feedback circuit comprising;

    a first voltage controlled oscillator configured to convert the feedback voltage into a first frequency signal and to supply the first frequency signal to a first frequency discriminator;

    a second voltage controlled oscillator configured to convert a reference voltage into a second frequency signal and to supply the second frequency signal to a second frequency discriminator;

    a digital comparator configured to compare digital outputs of the first and second frequency discriminators and to output a digital feedback signal; and

    a controller configured to control the digitally controlled pulse width modulator in accordance with the digital feedback signal.

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