Energy supply system (100, 200, 300) for a multi-voltage electronic device, the energy supply system (100, 200, 300) comprising: a main voltage supply (101, 201) configured to provide a main voltage (102, 202, 302), a plurality of voltage regulators (103, 104, 203, 204, 220, 303) each configured to convert the main voltage (102, 202, 302) into a respective operating voltage (107, 108, 207, 208, 221, 307) of a predefined voltage level, each voltage regulator comprising a voltage output (105, 106, 305) configured to output the respective operating voltage (107, 108, 207, 208, 221, 307), at least one switchable resistor (109, 110, 209, 210, 309, 310, 311, 312) between each one of the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) and ground (115, 215, 315), and a control unit (116, 216) configured to switch-on the switchable resistors (109, 110, 209, 210, 309, 310, 311, 312) between the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) and ground (115, 215, 315) when the main supply voltage is turned off such that the fall times of the operating voltages (107, 108, 207, 208, 221, 307) at the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) are equalized; the system further comprising a current sensor (225, 226, 227) for each one of the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303), wherein the current sensors (225, 226, 227) are configured to measure the current for the respective output (105, 106, 305); wherein the control unit (116, 216) is configured to determine the load on the outputs (105, 106, 305) based on the current measurements; wherein the control unit (116, 216) is further configured to control the main voltage supply (101, 201) to turn off the main voltage (102, 202, 302) and measure a fall-time for the single operating voltages (107, 108, 207, 208, 221, 307) without any of the switchable resistors (109, 110, 209, 210, 309, 310, 311, 312) switched-on; and wherein the control unit (116, 216) is further configured to calculate for every output (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) the required resistance to reduce a respective fall time or time constant to a predetermined one of the measured fall times. a main voltage supply (101, 201) configured to provide a main voltage (102, 202, 302), a plurality of voltage regulators (103, 104, 203, 204, 220, 303) each configured to convert the main voltage (102, 202, 302) into a respective operating voltage (107, 108, 207, 208, 221, 307) of a predefined voltage level, each voltage regulator comprising a voltage output (105, 106, 305) configured to output the respective operating voltage (107, 108, 207, 208, 221, 307), at least one switchable resistor (109, 110, 209, 210, 309, 310, 311, 312) between each one of the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) and ground (115, 215, 315), and a control unit (116, 216) configured to switch-on the switchable resistors (109, 110, 209, 210, 309, 310, 311, 312) between the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) and ground (115, 215, 315) when the main supply voltage is turned off such that the fall times of the operating voltages (107, 108, 207, 208, 221, 307) at the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) are equalized; the system further comprising a current sensor (225, 226, 227) for each one of the outputs (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303), wherein the current sensors (225, 226, 227) are configured to measure the current for the respective output (105, 106, 305); wherein the control unit (116, 216) is configured to determine the load on the outputs (105, 106, 305) based on the current measurements; wherein the control unit (116, 216) is further configured to control the main voltage supply (101, 201) to turn off the main voltage (102, 202, 302) and measure a fall-time for the single operating voltages (107, 108, 207, 208, 221, 307) without any of the switchable resistors (109, 110, 209, 210, 309, 310, 311, 312) switched-on; and wherein the control unit (116, 216) is further configured to calculate for every output (105, 106, 305) of the voltage regulators (103, 104, 203, 204, 220, 303) the required resistance to reduce a respective fall time or time constant to a predetermined one of the measured fall times.