Patent ID: 8441148

Claim:
A DC to DC converter, comprising: voltage regulation circuitry for generating at least two output voltages responsive to an input voltage, wherein the voltage regulation circuitry further comprises: a single inductor having a first side and a second side connected to provide each of the at least two output voltages; a plurality of main switches connected to the first side of the single inductor and to no other inductors connected to receive the input voltage; a plurality of auxiliary switches connected to the second side of the single inductor and to no other inductors, each of the plurality of auxiliary switches connected to provide one of the at least two output voltages; a dual-output PWM controller generating a first PWM control signal for controlling the operation of the plurality of main switches responsive to a first feedback voltage from a first output voltage of the at least two output voltages using a first control loop and not responsive to a second feedback voltage from a second output voltage of the at least two output voltages and for providing a second PWM control signal for controlling the operation of the plurality of auxiliary switches responsive to the second feedback voltage from the second output voltage of the at least two output voltages using a second control loop and not responsive to the first feedback voltage from the first output voltage of the at least two output voltages; wherein the first control loop further comprises: a first error amplifier connected to compare the first feedback voltage with a reference voltage and generating a first error voltage signal responsive thereto; a first comparator connected to compare the first error voltage signal with a slope compensation signal and generating a first PWM control signal at one of a first voltage level or a second voltage level responsive to the comparison; a first PWM modulator generating the first PWM signal for driving the plurality of main switches responsive to the first PWM control signal; wherein the second control loop further comprises: a second error amplifier connected to compare the second feedback voltage with the reference voltage and generating a second error voltage signal responsive thereto; a second comparator connected to compare the second error voltage signal with the slope compensation signal and generating a second PWM control signal at one of the first voltage level or the second voltage level responsive to the comparison; a second PWM modulator generating the second PWM signal for driving the plurality of auxiliary switches responsive to the second PWM control signal; a first driver circuit for driving the plurality of main switches responsive to the first PWM signal; and a second driver circuit for driving the plurality of auxiliary switches responsive to the second PWM signal.