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System and method for providing an active current assist with analog bypass for a switcher circuit

  • US 9,083,239 B2
  • Filed: 01/05/2012
  • Issued: 07/14/2015
  • Est. Priority Date: 06/18/2008
  • Status: Active Grant
First Claim
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1. A buck regulator circuit for providing buck regulation to supply a regulated load current to a load, the buck regulator circuit operable with a buck inductor coupled to the buck regulator at a switch node and to the load at an output node, and with an output capacitor coupled to the output node in parallel with the load, the buck regulator circuit comprising:

  • a switcher circuit operable to provide buck regulation and supply an inductor current through the buck inductor to the load, including charging and discharging the output capacitor; and

    an analog bypass (ACB) circuit including;

    an ACB current source coupled to the output node and in parallel with the buck inductor, and configured to supply, in response to an ACB control signal, an ACB current to the output node; and

    an ACB control circuit configured to provide the ACB control signal;

    wherein the ACB control circuit is configured to receive inductor current information from the switcher circuit, and to provide an inductor current signal representative of the inductor current relative to a predetermined inductor current value and whether the inductor current is positive or negative; and

    wherein the ACB control circuit is operable to provide the ACB control signal based on the inductor current signal such that the ACB circuit supplies ACB current to assist the inductor current supplied by the switcher circuit in charging and discharging the output capacitor.

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