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Automotive eCall Power Supply Reference Design with Low Intermediate Voltage (PMP9769)
This reference design includes a complete power management solution for a standalone emergency call (eCall) system in an automotive environment. The circuit is supplied directly from the car battery rail. It also manages a backup battery to power the eCall system while the car battery rail is not available. It includes power path management which routes the available power rail directly to four DC/DC converters which are supplying the required functional blocks of the eCall system. The solution is optimized to operate at maximum efficiency while powered from the backup battery.
Complete power solution for an automotive eCall system Operating input voltage range up to 40V Provides supply voltage for all required eCall functional blocks Up to 87% total efficiency while operating at backup power Up to 90% total efficiency in standby at backup power All DC/DC converters used can operate at switching frequencies above 2MHz
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