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LDO REGULATOR WITH IMPROVED LOAD TRANSIENT PERFORMANCE FOR INTERNAL POWER SUPPLY

  • US 20150185747A1
  • Filed: 11/17/2014
  • Published: 07/02/2015
  • Est. Priority Date: 01/02/2014
  • Status: Active Grant
First Claim
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1. A circuit, comprising:

  • a voltage regulator circuit with a feedback regulation loop and a drive transistor configured to supply an output current to a regulated output node; and

    a transient recovery circuit, comprising;

    a first transistor configured to source a first current to a control terminal of the drive transistor, wherein said first current is supplied in addition to a regulation control current applied to the control terminal of the drive transistor in response to operation of the feedback regulation loop;

    a first control circuit configured to selectively actuate the first transistor in response to a drop in voltage at the regulated output node;

    a second transistor configured to sink a second current from the regulated output node; and

    a second control circuit configured to control operation of said second transistor to increase a magnitude of the second current, from a first non-zero magnitude to a second, greater, non-zero magnitude, in response to an increase in voltage at the regulated output node.

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