I'm looking at Product Specification v1.2 - Reference Circuitry Configuration 2 where BUCK2 is not used. The schematic shows the output VOUT2 is tied to VSYS in this case, which doesn't look right.
Is there a reason for this, or is it a schematic error? I can't see why you would want to do this, or find any reference elsewhere in the document other than tying VSET2 to GND.