An electronic device for DC-DC conversion including a feedback loop coupled at one side to the inductor for measuring a current through the inductor with a series of an auxiliary capacitor and an auxiliary resistor, a transconductance stage coupled to the auxiliary capacitor for generating a current proportional to a voltage drop across the auxiliary capacitor, wherein the electronic device further includes a ramp resistor coupled to the output of the transconductance stage for generating a ramp voltage across the ramp resistor and a comparator receiving at a first input the ramp voltage, wherein the output of the comparator is coupled to a gate driving stage for driving a power transistor coupled with a control gate to the gate driving stage and with a channel to a switching node of the electronic device.