A dual-input, single-output low-dropout voltage regulator circuit includes: a first supply terminal, a second supply terminal and an output terminal, and first and second transistors having current paths coupled respectively between the first and second terminal and the output terminal. First and second drive circuit blocks are coupled respectively to the first and second supply terminals and drive the control terminals of the first and second transistors to provide a regulated voltage at the output terminal from the voltage on the first supply terminal and the second supply terminal. An input circuit block is sensitive to the voltage at the output terminal and is coupled to the first and second drive circuit blocks and configured to activate the second transistor to provide regulated voltage at the output terminal from the second terminal as a result of the voltage at the output terminal becoming lower than a desired value.