A switchable current source, comprising: - an input current path with a controllable current source to feed a changeable current (Itrim) to the input current path, the input current path being configured to provide a reference voltage (VREF) being dependent on the changeable current (Itrim), - an output terminal (LDR_PIN) to provide an output current (ILDR), - an output current path to provide an output current (ILDR), the output current path being connected to the output terminal (LDR_PIN) and being configured to convert the output current (ILDR) into a sensing voltage (VSENS), - a regulator circuit having a first input terminal (E1_RC) to apply a first input signal (VPOS) and a second input terminal (E2_RC) to apply a second input signal (VNEG) and an output terminal (O_RC) to provide an output signal (VOUT2), wherein the regulator circuit is arranged to provide the output signal (VOUT2) in dependence on a comparison of the first and second input signals, - a controllable output driver being controlled in dependence on the output signal (VOUT2), wherein the controllable output driver is arranged to change the output current (ILDR) in dependence on the output signal (VOUT2), - a feedback path coupled between the output current path and the first input terminal (E1_RC), - a first resistor being connected between the output terminal (O_RC) of the regulator circuit and a control terminal (C_MN) of the controllable output driver to apply a control signal (VGATE), - a capacitor being connected between the control terminal (C_MN) of the controllable output driver and a reference potential, - a switching circuit comprising a first controllable switch being connected between the control terminal (C_MN) of the controllable output driver and the reference potential such that the control terminal (C_MN) of the controllable output driver is applied to the reference potential via the first resistor, when the first controllable switch is switched in a conductive state, - wherein the switching circuit is configured to operate the switchable current source in a first and a second state, - wherein, in the first state, the switching circuit electrically couples the reference voltage (VREF) to the first input terminal (E1_RC) and the second input terminal (E2_RC) of the regulator circuit and electrically couples the reference potential to the control terminal (C_MN) of the controllable output driver, and, - wherein, in the second state, the switching circuit electrically couples the sensing voltage (VSENS) to the first input terminal (E1_RC) of the regulator circuit and electrically couples the reference voltage (VREF) to the second input terminal (E2_RC) of the regulator circuit and electrically couples the output signal (Vout2) to the control terminal (C_MN) of the controllable output driver. - an input current path with a controllable current source to feed a changeable current (Itrim) to the input current path, the input current path being configured to provide a reference voltage (VREF) being dependent on the changeable current (Itrim), - an output terminal (LDR_PIN) to provide an output current (ILDR), - an output current path to provide an output current (ILDR), the output current path being connected to the output terminal (LDR_PIN) and being configured to convert the output current (ILDR) into a sensing voltage (VSENS), - a regulator circuit having a first input terminal (E1_RC) to apply a first input signal (VPOS) and a second input terminal (E2_RC) to apply a second input signal (VNEG) and an output terminal (O_RC) to provide an output signal (VOUT2), wherein the regulator circuit is arranged to provide the output signal (VOUT2) in dependence on a comparison of the first and second input signals, - a controllable output driver being controlled in dependence on the output signal (VOUT2), wherein the controllable output driver is arranged to change the output current (ILDR) in dependence on the output signal (VOUT2), - a feedback path coupled between the output current path and the first input terminal (E1_RC), - a first resistor being connected between the output terminal (O_RC) of the regulator circuit and a control terminal (C_MN) of the controllable output driver to apply a control signal (VGATE), - a capacitor being connected between the control terminal (C_MN) of the controllable output driver and a reference potential, - a switching circuit comprising a first controllable switch being connected between the control terminal (C_MN) of the controllable output driver and the reference potential such that the control terminal (C_MN) of the controllable output driver is applied to the reference potential via the first resistor, when the first controllable switch is switched in a conductive state, - wherein the switching circuit is configured to operate the switchable current source in a first and a second state, - wherein, in the first state, the switching circuit electrically couples the reference voltage (VREF) to the first input terminal (E1_RC) and the second input terminal (E2_RC) of the regulator circuit and electrically couples the reference potential to the control terminal (C_MN) of the controllable output driver, and, - wherein, in the second state, the switching circuit electrically couples the sensing voltage (VSENS) to the first input terminal (E1_RC) of the regulator circuit and electrically couples the reference voltage (VREF) to the second input terminal (E2_RC) of the regulator circuit and electrically couples the output signal (Vout2) to the control terminal (C_MN) of the controllable output driver.