The obminimize program does not have all the features of the obabel command. 
You can naturally convert a PDB file to SDF:

obabel file.pdb -O file.sdf

> I tried -osdf filename.sdf and it didn't work. How can I get it in sdf format?
> Or how can I convert multimolecule pdb file to an sdf file?

You can also use the --minimize flag with obabel to minimize molecules.
http://open-babel.readthedocs.io/en/latest/Command-line_tools/babel.html?highlight=minimize#forcefield-energy-and-minimization

Hope that helps,
-Geoff
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