The TPS65980 DC/DC switching regulator that receives power from a Thunderbolt™ or Thunderbolt™ 2 power bus ranging from 2.5-V to 15.75-V and generates three separate 3.3-V supply outputs. The TBTOUT supply provides power to the local peripheral Thunderbolt™ controller and support circuitry. The CBLOUT supply provides power back to the Thunderbolt™ cable and has adjustable current limit. The DEVOUT supply provides power to all other circuitry in the device to perform its designed function. The TPS65980 is available in a 24-pin 5mm x 4mm x 0.9mm VQFN package.