The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 11, 2012
Filed:
Oct. 21, 2009
Xuelin Wu, Dallas, TX (US);
Xuelin Wu, Dallas, TX (US);
Intersil Americas Inc., Milpitas, CA (US);
Abstract
A multi-phase voltage regulator comprises a plurality of DC/DC voltage regulators. Each of the DC/DC voltage regulators is associated with a particular phase of the multi-phase regulator. Each of the regulators comprises a first switching transistor connected between an input voltage node and a phase node responsive to switching control signals. A second switching transistor is connected between the phase node and a ground node and is responsive to the switching control signals. An inductor is connected between the phase node and an output voltage node. Control logic generates the switching control signals responsive to a pulse control signal. PFM/PWM transition logic generates the pulse control signal. The pulse control signal transitions between a PWM signal and a PFM signal responsive to an error voltage, a feedback voltage from the output voltage node and an inductor current through the inductor. An error amplifier generates the error voltage responsive to the feedback voltage and a reference voltage. The output of each error amplifier in each of the plurality of phases are connected to each other. A capacitor is connected between the output voltage node and a ground node.