Switching regulator receives power from a Thunderbolt or Thunderbolt 2 bus

The TPS65980 DC-DC switching regulator from Texas Instruments (TI) receives power from a Thunderbolt or Thunderbolt 2 power bus ranging from 2.5V to 15.75V and generates three separate 3.3V supply outputs. The TBT_OUT supply provides power to the local peripheral Thunderbolt controller and support circuitry. The CBL_OUT supply provides power back to the Thunderbolt cable and has adjustable current limit. The DEV_OUT 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.