Part of an ABC transporter complex involved in ferric-petrobactin uptake. Probably responsible for energy coupling to the transport system. a Fe(III)-siderophore(out) + ATP + H2O = a Fe(III)-siderophore(in) + ADP + H(+) + phosphate The complex is composed of two ATP-binding proteins (FpuD), two transmembrane proteins (FpuB) and a solute-binding protein (FpuA). A mutant lacking fatE, fpuC and fpuD ATPases is deficient in petrobactin import in iron-depleted conditions. Belongs to the ABC transporter superfamily.