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TPS2124: Battery switching primary to secondary

Part Number: TPS2124

Tool/software:

Hi team, 

I am looking for a design suggestion for automatic switching of battery supplies (primary to secondary) in one of our Automotive projects. The use case is that when the primary one is dead to ensure continuous power supply to the ECU. So kindly suggest a solution for the battery switching.

The input battery supply : 24V.

The Continuous load current : 12A.

Thanks,

jayanthi.