Switching mode power supply comprising asynchronous limiter circuit

A switching mode power supply device comprising at least one MOS power transistor made on an integrated circuit and operating in switching mode, the drain and the source of said at least one MOS power transistor being connected together, via connecting members having a non-null inductance, to one or several external circuits to said integrated circuit, characterized in that it further comprises a limiter circuit able to limit the current variations in at least one of said connecting members during the switching of said MOS power transistor, said limiter circuit comprising:

• a resistance mounted in series with a capacitor between the source and the drain of the power transistor, the source of the power transistor being connected to a first terminal of the resistance and the drain of the power transistor being connected to a first terminal of the capacitor, and
• at least a first MOS transistor having its gate connected to an intermediate point between said resistance and said capacitor, its drain connected to the drain of the MOS power transistor and its source connected to the source of the MOS power transistor.