Catalyzes the ATP-dependent translocation of sphingoid long-chain bases (LCBs) from the cytoplasmic site toward the extracytoplasmic side of the membrane (flip-flop). Involved in the establishment of the functional lipid asymmetry of the plasma membrane. Regulates intracellular levels of LCBs, sphingolipid precursors that are growth inhibitory at increased levels (By similarity). In response to loss of mitochondrial DNA in a transcription factor PDR3-dependent manner. Induced in response to altered glycerophospholipid asymmetry of the plasma membrane in a transcription factor PDR1-dependent manner (By similarity). Belongs to the lipid-translocating exporter (LTE) (TC 9.A.26.1) family.