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LM2574HV: ORing output of LM2574HV (+5V) with USB VBUS using Diodes

Part Number: LM2574HV
Other Parts Discussed in Thread: LM2574


I am currently planning on using the LM2574HV adjustable switching regulator to regulate 24V input down to 5V, no more than 0.1A needed on output. However, we also need the ability to power the logic levels with USB VBUS when the 24V input is not present on the design. 

The questions is, will a diode OR between LM2574's output and USB VBUS be sufficient/OK for this? What is the state of LM2574's output when no 24V input is present? Is it High-Z?

I've attached a schematic snippet of this portion of the design, please see below:

Thank you so much in advance for any feedback you can provide!

Jason Metzner