06476589 is referenced by 99 patents and cites 9 patents.

Methods for synchronizing non-constant frequency switching regulators with a phase locked loop are disclosed. The methods enable non-constant frequency switching regulators to be synchronized with a phase locked loop to achieve constant frequency operation in steady state while retaining the advantages of non-frequency operation to improve transient response and operate over a wider range of duty cycles. In addition, the methods enable multiple non-constant frequency regulators to be synchronized and operated in parallel to deliver higher power levels to the output than a single switching regulator.

Title
Circuits and methods for synchronizing non-constant frequency switching regulators with a phase locked loop
Application Number
9/827872
Publication Number
6476589 (B2)
Application Date
April 6, 2001
Publication Date
November 5, 2002
Inventor
Randy G Flatness
Los Gatos
CA, US
Christopher B Umminger
Mountain View
CA, US
Agent
Fish & Neave
US
Agent
Michael J DeHaemer Jr
US
Mark D Rowland
US
Assignee
Linear Technology Corporation
CA, US
IPC
G05F 1/652
View Original Source