A voltage regulator integrated in a chip of semiconductor material having a first input terminal for receiving a first voltage (Vhv) and an output terminal for providing a regulated voltage (Vreg) obtained from the first voltage, the regulator including: differential amplifier for receiving a comparison voltage (Vref) and a feedback signal (Vfb) being a function of the regulated voltage, and for providing a regulation signal (Vr) according to a comparison between the comparison voltage and the feedback signal, the differential amplifier having a first supply terminal coupled with a reference terminal for receiving a reference voltage and a second supply terminal, a regulation transistor having a control terminal for receiving the regulation signal and a first conduction terminal and a second conduction terminal, the conduction first terminal being coupled to the reference terminal and the conduction second terminal being coupled to the first input terminal of the regulator through loading means (Rpup), characterized in that the second supply terminal of the differential amplifier is coupled with a second input terminal of the regulator for receiving a second voltage (vdd) which is lower than the first voltage in absolute value, and the regulator further includes a set of auxiliary transistors (MS1-MS5) each having a conduction first terminal and a conduction second terminal being connected in series between the second terminal of the regulation transistor and the output terminal of the regulator, such that the conduction second terminal of one transistor is coupled to the conduction first terminal of an adjacent transistor, and control means for controlling the auxiliary transistors according to the regulated voltage, the set of auxiliary transistors (MS1 - MS5) each further having a control terminal to receive a corresponding control signal (VHS1 - VHS5), the corresponding control signal (VHS1 - VHS5) being generated by a voltage divider partitioning the first voltage (Vhv) into lower voltages (V1 - V5), the lower voltages (V1 - V5) to provide an input to switches that are adapted to generate the corresponding control signal (VHS1- VHS5) based on a state of an enable signal. differential amplifier for receiving a comparison voltage (Vref) and a feedback signal (Vfb) being a function of the regulated voltage, and for providing a regulation signal (Vr) according to a comparison between the comparison voltage and the feedback signal, the differential amplifier having a first supply terminal coupled with a reference terminal for receiving a reference voltage and a second supply terminal, a regulation transistor having a control terminal for receiving the regulation signal and a first conduction terminal and a second conduction terminal, the conduction first terminal being coupled to the reference terminal and the conduction second terminal being coupled to the first input terminal of the regulator through loading means (Rpup), characterized in that the second supply terminal of the differential amplifier is coupled with a second input terminal of the regulator for receiving a second voltage (vdd) which is lower than the first voltage in absolute value, and the regulator further includes a set of auxiliary transistors (MS1-MS5) each having a conduction first terminal and a conduction second terminal being connected in series between the second terminal of the regulation transistor and the output terminal of the regulator, such that the conduction second terminal of one transistor is coupled to the conduction first terminal of an adjacent transistor, and control means for controlling the auxiliary transistors according to the regulated voltage, the set of auxiliary transistors (MS1 - MS5) each further having a control terminal to receive a corresponding control signal (VHS1 - VHS5), the corresponding control signal (VHS1 - VHS5) being generated by a voltage divider partitioning the first voltage (Vhv) into lower voltages (V1 - V5), the lower voltages (V1 - V5) to provide an input to switches that are adapted to generate the corresponding control signal (VHS1- VHS5) based on a state of an enable signal.