Hi Michael,
Because of the tolerance of the 11V rail, i recommend 3.3V to a boost to 11V. I recommend looking at the PMP7298. Please see below:
http://www.ti.com/tool/pmp7298
Other Parts Discussed in Thread: TPS23753A
I'm using a TPS23753A to design a PD with no need for data passthrough. The device will be a "dumb" dead end device that just acquires power through PoE.
Reference the schematic snippet below from…