This issue has come up before. Really needs to be addressed in data sheet.
For the Fixed version of the part, the only reference to which output is which fixed voltage is in table 3 on page 23 of the data sheet. Table is titled "device nomenclature". This information needs to be clarified or at least pointed to earlier in the data sheet. Pin Functions table would be a good place to put the link.
Just my 2 cents.
