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Active O-Ring solution?

I'm designing a power circuit with dual-input power options: PoE+ and 12VDC plug

The PoE+ DC/DC will provide 12V 4A which will feed other power stages

The 12VDC plug will also provide 12V 4A which will be backup power for PoE DC/DC

Does TI have a solution such as active o-ring for auto-selecting power input?