The Facility for Rare Isotope Beams (FRIB), a Department of Energy (DOE) national user facility to provide intense beams of rare isotopes for nuclear science researchers, is currently being established on the campus of Michigan State University (MSU). A superconducting driver linac will deliver cw beams of stable isotopes with an energy of >200 MeV/u at a beam power of 400 kW. Highly charged ions will be produced from an Electron Cyclotron Resonance Ion Source (ECRIS) with a total extraction current of several mA. Multiple charge states of heavier ions will be accelerated simultaneously to meet the final beam power requirement. The FRIB driver linac lattice design has been developed and end-to-end beam simulations have been performed to evaluate the machine performance. An overview of the beam dynamics is presented.