An embodiment of a current sensing device for a DC-DC converter comprising an output node through which passes an output current and taken to an output potential equal respectively to first and second values. The current sensing device comprises an amplifying module comprising a retroaction node through which passes a mirror current that is proportional to the output current and taken to the potential present on a first input of the amplifying module. The device also comprises a first intermediate module mounted between the first potential and the output node, comprising an intermediate node connected to the first input and taken to an intermediate potential equal to third and fourth values respectively correlated to the first and second values, wherein the difference between the third and fourth values is smaller than the difference between the first and second values.