An electrical power supply control device for use in an automotive electronic control unit, the electrical power supply control device being in the form of an integrated circuit, housed in a casing, and configured to be connected to an automotive main electrical power supply device to receive a main supply voltage (V BATT), to a back-up electrical power supply device to receive a back-up supply voltage (V BACK-UP), and to electronic telematic modules (2a-2d) and a microprocessor to control power supply thereof; wherein the electrical power supply control device comprises: • a boost switching regulator configured to receive the main supply voltage (V BATT) and the back-up supply voltage (V BACK-UP), and to output a boost supply voltage (V BOOST) requisite for guaranteeing proper operation of the electronic telematic modules (2a-2d) and the microprocessor of an electronic telematic function control device, based on the main supply voltage (V BATT) or, in case of failure of the main electrical power supply device, the back-up supply voltage (V BACK-UP); and • at least one Buck switching voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a switch supply voltage (V SWITCH) for the electronic telematic modules (2a-2d) which are to be supplied with a relatively low supply voltage and a relatively high supply current; • at least one linear voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a linear supply voltage (V LINEAR) for the electronic telematic modules (2a-2d) which are to be supplied with a relatively low supply voltage and a relatively low supply current; • a stand-by voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a stand-by supply voltage (V STAND-BY) for the electronic telematic modules (2a-2d) which are in a stand-by condition; and • a logic control unit connected to the microprocessor, the boost switching voltage regulator, the Buck switching voltage regulator, the linear voltage regulator and the stand-by voltage regulator and configured to receive control signals from the microprocessor and to control the Buck switching voltage regulator, the linear voltage regulator and the stand-by voltage regulator based on the received control signals; wherein the microprocessor is programmed to periodically perform a watchdog function to check proper operation of the electronic telematic function control device; wherein the logic control unit is designed to periodically check performance of the watchdog function by the microprocessor and, in case the watchdog function is detected to be unperformed, to reset the microprocessor to restore proper operation of the electronic telematic function control device; and wherein the logic control unit is further configured to receive an external control signal indicative of occurrence of events that require operation of one or more electronic telematic modules (2a-2d), and to restore proper supply of the microprocessor and of the electronic telematic modules (2a-2d) that are in a stand-by condition and that are required to be operated. • a boost switching regulator configured to receive the main supply voltage (V BATT) and the back-up supply voltage (V BACK-UP), and to output a boost supply voltage (V BOOST) requisite for guaranteeing proper operation of the electronic telematic modules (2a-2d) and the microprocessor of an electronic telematic function control device, based on the main supply voltage (V BATT) or, in case of failure of the main electrical power supply device, the back-up supply voltage (V BACK-UP); and • at least one Buck switching voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a switch supply voltage (V SWITCH) for the electronic telematic modules (2a-2d) which are to be supplied with a relatively low supply voltage and a relatively high supply current; • at least one linear voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a linear supply voltage (V LINEAR) for the electronic telematic modules (2a-2d) which are to be supplied with a relatively low supply voltage and a relatively low supply current; • a stand-by voltage regulator configured to receive the boost supply voltage (V BOOST) and to output a stand-by supply voltage (V STAND-BY) for the electronic telematic modules (2a-2d) which are in a stand-by condition; and • a logic control unit connected to the microprocessor, the boost switching voltage regulator, the Buck switching voltage regulator, the linear voltage regulator and the stand-by voltage regulator and configured to receive control signals from the microprocessor and to control the Buck switching voltage regulator, the linear voltage regulator and the stand-by voltage regulator based on the received control signals; wherein the microprocessor is programmed to periodically perform a watchdog function to check proper operation of the electronic telematic function control device; wherein the logic control unit is designed to periodically check performance of the watchdog function by the microprocessor and, in case the watchdog function is detected to be unperformed, to reset the microprocessor to restore proper operation of the electronic telematic function control device; and wherein the logic control unit is further configured to receive an external control signal indicative of occurrence of events that require operation of one or more electronic telematic modules (2a-2d), and to restore proper supply of the microprocessor and of the electronic telematic modules (2a-2d) that are in a stand-by condition and that are required to be operated.