  We perform a quantitative spectroscopic analysis of 105 presumably single O
dwarf stars in 30 Doradus, located within the Large Magellanic Cloud. We use
mid-to-high resolution multi-epoch optical spectroscopic data obtained within
the VLT-FLAMES Tarantula Survey. Stellar and wind parameters are derived by
means of the automatic tool IACOB-GBAT, which is based on a large grid of
FASTWIND models. We also benefit from the Bayesian tool BONNSAI to estimate
evolutionary masses. We provide a spectral calibration for the effective
temperature of O dwarf stars in the LMC, deal with the mass discrepancy problem
and investigate the wind properties of the sample.
