LM2679T-12 LM2679T-12/NOPB LM2679T-13+ LM2679T-3.3 LM2679T-3.3/NOPB LM2679T-5.0 LM2679T-5.0/NOPB LM2679T-ADJ LM2679T-ADJ/NOPB LM2681