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Start-up circuit for voltage regulators

  • US 6,163,140 A
  • Filed: 02/01/2000
  • Issued: 12/19/2000
  • Est. Priority Date: 02/01/2000
  • Status: Expired due to Term
First Claim
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1. A start-up circuit for a voltage regulator, said voltage regulator for providing a regulated voltage, said regulator having an operating voltage input terminal, said start-up circuit comprising:

  • a depletion mode field effect transistor, said transistor having a drain electrically coupled to receive a power supply voltage, a source electrically coupled to said operating voltage input terminal and electrically coupled to receive a voltage corresponding to an output voltage of said regulator, a body at a fixed voltage, and a gate; and

    a comparator having a first input terminal electrically coupled to receive said voltage corresponding to said output voltage of said regulator, said comparator having its output terminal electrically coupled to said gate of said transistor.

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