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TPS563240: Followed Webench Power Designer Schematic - have unexpected results

Part Number: TPS563240
Other Parts Discussed in Thread: TPS563212, LP3872

I used the Webench to design a buck converter using TPS563240.  I utilized the TPS563249EVM PCB to prototype the design, changing all parts as necessary (including TPS56240).

The design characteristics were: 5.5-9VDC input / 5.1VDC / 2A output - with the actual output current range to be .015 - 1.5A.

The various input voltage and output current scenarios check out without any errors within Power Designer and in fact the data results even look very promising across that range.

However, in application, the output doesn't reach 5.1VDC until the input is between 8-9VDC, depending on output current draw.

Does the Webench Power Designer not account for the dropout calculations in the datasheet for the TPS563240?  It seems that it would have to in order to be a fully useful tool?

Thank you