Backup Power Supply Design

Hi everyone,

I would like to design a fail safe backup DC/DC converter. My input is 28V and I have to use one main source and one backup source. If main source is failed, then backup will turn on immediately. Is there any power monitor for this application ? I found a LTC4420 for this kind of application but I'm not sure. 

Technical specs:

28V input

12V, 2.5A output needs.

Thanks!

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