I haven't heard of that plink "raw format". the most common one is indeed the PED format, plus its binary version BED. all the data formats supported by plink and the conversions from one to another are very well described in that documentation.
EDIT: the "--recode" option generates the standard PED format. if you need the binary PED format (BED) the "--make-bed" option is needed.
Leaving this here in case people still run into this problem. I implemented a suggestion from Chris Chang to beat a dosage file (subset of PLINK RAW) through a PLINK formatting pipeline. The output can be PED/MAP, BED/BIM/BAM, or whatever other PLINK output you like.
See discussion here.