Patent ID: 8330439

Claim:
A multiphase voltage regulator, comprising: a plurality of DC/DC voltage regulators, each of the DC/DC voltage regulators associated with a phase of the multiphase voltage regulator, each of the plurality of DC/DC voltage regulators, comprising: a first switching transistor connected between an input voltage node and a phase node responsive to switching control signals; a second switching transistor connected between the phase node and a ground node responsive to the switching control signals; an inductor connected between the phase node and an output voltage node; control logic for generating the switching control signals responsive to a pulse control signal; PFM/PWM transition logic for generating the pulse control signal, wherein 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; and an error amplifier for generating the error voltage responsive to the feedback voltage and a reference voltage, wherein the output of each error amplifier in each of the plurality of phases are connected to each other.