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 (103, 107) 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 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 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 (103, 107) 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 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 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 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 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.