Patent ID: 8593121

Claim:
A voltage regulator comprising: a power conversion module configured to receive an input voltage, and to convert the input voltage into an output voltage configurable to be regulated to a plurality of output values indexed from 1 to N, wherein N is a positive integer; a feedback and trimming module comprising a plurality of voltage dividing devices coupled in series between the output voltage and ground, wherein the feedback and trimming module is configured to provide a plurality of feedback terminals indexed from 1 to N leading out from N different positions on the plurality of voltage dividing devices, and wherein the plurality of feedback terminals indexed from 1 to N are configured to provide a plurality of feedback voltages indexed from 1 to N respectively corresponding to the plurality of output values indexed from 1 to N; and a control module configured to selectively receive one of the plurality of feedback voltages indexed by X a time, and to compare the received feedback voltage indexed by X with a reference signal to provide a control signal to the power conversion module, wherein the control signal represents an error between the received feedback voltage indexed by X and the reference signal, and wherein the power conversion module regulates the output voltage to the output value indexed by X corresponding to the received feedback voltage indexed by X in response to the control signal, and wherein X changes from 1 to N; and wherein the feedback and trimming module is further configured to successively trim the leading out positions of the plurality of feedback terminals indexed from 1 to N on the plurality of voltage dividing devices so as to successively trim the plurality of output values indexed from 1 to N to their desired values independently.