Voltage-regulating circuit and regulated power-supply module

A voltage-regulating circuit comprising at least an input terminal, a reference terminal and an output terminal, a voltage source, which is connected between the input terminal and the reference terminal, delivering an input voltage, said voltage-regulating circuit delivering a regulated output voltage across the output terminal and the reference terminal, and comprising:

• a voltage regulator,
• a switch, connected in series with the voltage regulator between the input terminal and the output terminal, said switch and said voltage regulator forming a first assembly,
• a first comparing circuit connected to the input terminal and to the output terminal, said first comparing circuit being arranged to compare the amplitude deviation between the input voltage and the output voltage to a first threshold,
• a second comparing circuit connected to the output terminal and to the reference terminal, said second comparing circuit being arranged to compare the amplitude of the output voltage to a second threshold, and
• a control circuit connected to the first comparing circuit, to the second comparing circuit and to the switch, said control circuit being arranged to command the switch to open or close,
• wherein the control circuit controls the switch to open or close depending:
• on the comparison of the amplitude deviation between the input voltage and the output voltage to the first threshold, and
• on the comparison of the amplitude of the output voltage to the second threshold.