A circuit for generating an auxiliary voltage in a clocked DC-DC converter having a wide frequency and/or voltage range of its useful signal, comprising: - an input (101, ground) for inputting a supply signal which can be coupled out as an AC voltage between an inductive tap on the converter inductor of the DC-DC converter and a reference potential by means of a pump capacitor, - a charge pump, the charge pump comprising the pump capacitor, a freewheeling diode and a pump diode, the pump capacitor and the freewheeling diode being connected in series and being switchable between the inductive tap and the reference potential, the pump diode being coupled to a node between the pump capacitor and the freewheeling diode, - an output (104, ground) having a storage capacitor for outputting the auxiliary voltage, the storage capacitor being connected in parallel to the output for storing the auxiliary voltage, and the auxiliary voltage being applied in use between the output node and the reference potential, - a voltage-limiting element which is connected in parallel with the storage capacitor for limiting the auxiliary voltage in its magnitude, - a further inductor which is connected between the node of the pump capacitor and freewheeling diode and the pump diode in order to limit the discharge current of the pump capacitor at high frequencies during operation of the DC-DC converter, and to relieve the voltage-limiting element at high frequencies, the charge pump being configured in cooperation with the further inductor and the voltage-limiting element to transfer a discharge current of the pump capacitor into the storage capacitor during operation of the DC-DC converter. - an input (101, ground) for inputting a supply signal which can be coupled out as an AC voltage between an inductive tap on the converter inductor of the DC-DC converter and a reference potential by means of a pump capacitor, - a charge pump, the charge pump comprising the pump capacitor, a freewheeling diode and a pump diode, the pump capacitor and the freewheeling diode being connected in series and being switchable between the inductive tap and the reference potential, the pump diode being coupled to a node between the pump capacitor and the freewheeling diode, - an output (104, ground) having a storage capacitor for outputting the auxiliary voltage, the storage capacitor being connected in parallel to the output for storing the auxiliary voltage, and the auxiliary voltage being applied in use between the output node and the reference potential, - a voltage-limiting element which is connected in parallel with the storage capacitor for limiting the auxiliary voltage in its magnitude, - a further inductor which is connected between the node of the pump capacitor and freewheeling diode and the pump diode in order to limit the discharge current of the pump capacitor at high frequencies during operation of the DC-DC converter, and to relieve the voltage-limiting element at high frequencies, the charge pump being configured in cooperation with the further inductor and the voltage-limiting element to transfer a discharge current of the pump capacitor into the storage capacitor during operation of the DC-DC converter.