Current detection circuit and over-current protection device

A current sensing circuit comprising at least several pairs of first field-effect transistors and second field-effect transistors, wherein the current sensing circuit is configured such that:

• a first one of a source electrode and a drain electrode of each of the first field-effect transistors and the second field-effect transistors is coupled to an input of the current sensing circuit on which a current to be sensed is to be applied;
• for each pair of one of the first field-effect transistors and of one of the second field-effect transistors, a size ratio W1/L1 of the first field-effect transistors is higher than a size ratio W2/L2 of the second field-effect transistors, with W1 and W2 corresponding to widths of active areas of the first field-effect transistors and the second field-effect transistors, and L1 and L2 corresponding to lengths of the active areas of the first field-effect transistors and the second field-effect transistors.