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Voltage-regulator and power supply having current sharing circuit

  • US 20060279269A1
  • Filed: 06/08/2005
  • Published: 12/14/2006
  • Est. Priority Date: 06/08/2005
  • Status: Active Grant
First Claim
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1. A voltage-regulator having current-sharing circuit, comprising at least an input terminal, an output terminal and an enabling terminal, wherein said enabling terminal enables or disables said voltage-regulator and provides a current-sharing control interface, comprising:

  • a pass transistor, having a first terminal connected to said input terminal of said voltage-regulator to receive an input voltage;

    a second terminal connected to said output terminal of said voltage-regulator to provide an output voltage and an output current to said output terminal; and

    a third terminal;

    a band-gap unit, for generating a reference voltage;

    a feedback control circuit, coupled to said output terminal of said voltage-regulator and said pass transistor for detecting said output current, outputting a current-sense signal in response to said output current, and regulating and outputting a control signal to said third terminal of said pass transistor for controlling said voltage-regulator in response to a reference signal; and

    a current-sharing unit, coupled to said enabling terminal and said feedback control circuit for generating a bus signal in response to said current-sense signal and said reference voltage and generating said reference signal in response to said reference voltage, said bus signal and said current-sense signal.

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