A circuit for reducing current drawn by a load (108, 210) from a power supply, the circuit comprising a current sensor (104, 204, 300, 604) and a current limiter (106, 206, 400): wherein the current sensor (104, 204, 300, 604) comprises: a voltage dropping element (104, M3) for providing a controlled voltage drop with a magnitude V drop between the power supply and the load (108, 210) and for providing a sensed current output; and a feedback element (M1, M2) connected between an output terminal and an input terminal of the voltage dropping element; wherein the feedback element is configured to provide a driving voltage to the input terminal of the voltage dropping element (104, M3) to control the voltage dropping element to provide the controlled voltage drop that is independent of a current flowing through the voltage dropping element (104, M3); and wherein the current limiter (106, 206, 400) comprises: a load switch coupled between the output terminal of the voltage dropping element (104, M3) and the load; a current copying device configured to provide a scaled copy of a current through the voltage dropping element; a current comparing element for comparing the scaled copy of the current through the voltage dropping element to a reference current (I ref) thereby providing a comparison output signal; wherein the load switch is controlled by the comparison output signal of the current comparing element such that it disconnects the load from the output terminal of the voltage dropping element if the scaled copy of the current exceeds the reference current. wherein the current sensor (104, 204, 300, 604) comprises: a voltage dropping element (104, M3) for providing a controlled voltage drop with a magnitude V drop between the power supply and the load (108, 210) and for providing a sensed current output; and a feedback element (M1, M2) connected between an output terminal and an input terminal of the voltage dropping element; a voltage dropping element (104, M3) for providing a controlled voltage drop with a magnitude V drop between the power supply and the load (108, 210) and for providing a sensed current output; and a feedback element (M1, M2) connected between an output terminal and an input terminal of the voltage dropping element; wherein the feedback element is configured to provide a driving voltage to the input terminal of the voltage dropping element (104, M3) to control the voltage dropping element to provide the controlled voltage drop that is independent of a current flowing through the voltage dropping element (104, M3); and wherein the current limiter (106, 206, 400) comprises: a load switch coupled between the output terminal of the voltage dropping element (104, M3) and the load; a current copying device configured to provide a scaled copy of a current through the voltage dropping element; a current comparing element for comparing the scaled copy of the current through the voltage dropping element to a reference current (I ref) thereby providing a comparison output signal; a load switch coupled between the output terminal of the voltage dropping element (104, M3) and the load; a current copying device configured to provide a scaled copy of a current through the voltage dropping element; a current comparing element for comparing the scaled copy of the current through the voltage dropping element to a reference current (I ref) thereby providing a comparison output signal; wherein the load switch is controlled by the comparison output signal of the current comparing element such that it disconnects the load from the output terminal of the voltage dropping element if the scaled copy of the current exceeds the reference current.