A voltage-regulator device comprising: an error-amplifier stage having a first input and a second input, which are designed to receive a reference voltage (V i) and a feedback voltage (V R), respectively, and an output; an output amplifier stage, which has an input coupled to the output of the error-amplifier stage and is designed to supply at its output an output voltage (V OUT) related to the reference voltage (V i) by an amplification factor (α); a feedback stage, which is coupled to the output of the output amplifier stage and is designed to generate the feedback voltage (V R) as a function of the output voltage (V OUT) for implementing a first feedback loop; and a compensation stage, which is set between the output and the input of the output amplifier stage and is configured to implement a second feedback loop, which is designed to cause, in response to a variation of said output voltage (V OUT), a corresponding variation of a biasing voltage (V G) for the input of the output amplifier stage, wherein the compensation stage comprises: a coupling-capacitor element (C F), connected between the output of the output amplifier stage and a first internal node; and a driving module, which has an input connected to the first internal node and an output connected to the input of the output amplifier stage and is configured to generate a compensation voltage (V S) for driving the output amplifier stage, characterized in that said driving module comprises a discharge transistor (M p2) in voltage-follower configuration, connected to the input of the output amplifier stage and configured to provide the compensation voltage (V S) and to implement, immediately in response to variation of said output voltage (V OUT), a current path (I S) towards the input of the output amplifier stage. an error-amplifier stage having a first input and a second input, which are designed to receive a reference voltage (V i) and a feedback voltage (V R), respectively, and an output; an output amplifier stage, which has an input coupled to the output of the error-amplifier stage and is designed to supply at its output an output voltage (V OUT) related to the reference voltage (V i) by an amplification factor (α); a feedback stage, which is coupled to the output of the output amplifier stage and is designed to generate the feedback voltage (V R) as a function of the output voltage (V OUT) for implementing a first feedback loop; and a compensation stage, which is set between the output and the input of the output amplifier stage and is configured to implement a second feedback loop, which is designed to cause, in response to a variation of said output voltage (V OUT), a corresponding variation of a biasing voltage (V G) for the input of the output amplifier stage, wherein the compensation stage comprises: a coupling-capacitor element (C F), connected between the output of the output amplifier stage and a first internal node; and a driving module, which has an input connected to the first internal node and an output connected to the input of the output amplifier stage and is configured to generate a compensation voltage (V S) for driving the output amplifier stage, characterized in that said driving module comprises a discharge transistor (M p2) in voltage-follower configuration, connected to the input of the output amplifier stage and configured to provide the compensation voltage (V S) and to implement, immediately in response to variation of said output voltage (V OUT), a current path (I S) towards the input of the output amplifier stage.