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
The TPS65980 is available in a 24-pin 5mm x 4mm x 0.9mm VQFN package.