A device comprising: an inductive element coupling a first node to a second node , the first node being destined to receive a DC supply voltage (Vin) referenced to a fourth node of application of a reference potential; at least one first MOS transistor coupling the second node to a third node ; a second capacitive element coupling the third node and the fourth node ; a first control circuit of the first transistor , the first circuit comprising: a first switch coupling the third node to the gate (G) of the first transistor; a capacitive element connected between the second node and a fifth node ; and a series association of a first diode and of a third switch connected between the fifth node and the gate (G) of the first transistor , the anode of the first diode being on the side of the fifth node , the control terminal of the third switch being connected to the control terminal of the first switch , the third switch is a third transistor having a channel type opposite to that of the channel of the first transistor ; a second diode in series with the first transistor between the second and third nodes, the anode of the second diode being coupled to the second node , the second diode and the body diode of the first transistor being connected in reverse directions with respect to each other ; and a third diode connected between the first node and the fifth node , the anode of the third diode being on the side of the first node , the device forming a switched-mode power converter. an inductive element coupling a first node to a second node , the first node being destined to receive a DC supply voltage (Vin) referenced to a fourth node of application of a reference potential; at least one first MOS transistor coupling the second node to a third node ; a second capacitive element coupling the third node and the fourth node ; a first control circuit of the first transistor , the first circuit comprising: a first switch coupling the third node to the gate (G) of the first transistor; a capacitive element connected between the second node and a fifth node ; and a series association of a first diode and of a third switch connected between the fifth node and the gate (G) of the first transistor , the anode of the first diode being on the side of the fifth node , the control terminal of the third switch being connected to the control terminal of the first switch , the third switch is a third transistor having a channel type opposite to that of the channel of the first transistor ; a first switch coupling the third node to the gate (G) of the first transistor; a capacitive element connected between the second node and a fifth node ; and a series association of a first diode and of a third switch connected between the fifth node and the gate (G) of the first transistor , the anode of the first diode being on the side of the fifth node , the control terminal of the third switch being connected to the control terminal of the first switch , the third switch is a third transistor having a channel type opposite to that of the channel of the first transistor ; a second diode in series with the first transistor between the second and third nodes, the anode of the second diode being coupled to the second node , the second diode and the body diode of the first transistor being connected in reverse directions with respect to each other ; and a third diode connected between the first node and the fifth node , the anode of the third diode being on the side of the first node , the device forming a switched-mode power converter. <EOS>