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 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.
DEVICE NAME | PACKAGE | BODY SIZE |
---|---|---|
TPS65980 | VQFN (24) | 5mm x 4mm |
Changes from * Revision (April 2014) to A Revision
PIN | I/O | DESCRIPTION | |
---|---|---|---|
NO. | NAME | ||
1 | SS | ANALOG | Soft Start Capacitance. This pin sets the soft start ramp rate when the TBT_IN voltage ramps from 0V to high voltage. |
2, 3, 4 | GND | GND | Device Ground |
5 | HV_OK | OUTPUT | High Voltage Present Indicator. This pin indicates that a high voltage is present on TBT_IN. The output asserts high when the TBT_IN pin is above the VHVT voltage and the RESET output is asserting high. |
6 | RESET | OUTPUT | Reset output indicator. This pin asserts low when TBT_OUT is in under-voltage. |
7 | CBL_OUT | PWROUT | Current Limited Power Output to Thunderbolt™ Cable. This pin supplies power to the Thunderbolt™ cable. The current limit of this pin is set by the CBL_ILIMIT pin. |
8 | CBL_ILIMIT | INPUT | Current Limit Set. Logic input that sets the current limit state on the CBL_OUT pin. Tie pin to TBT_OUT for a logic high input. |
9 | DEV_EN | INPUT | Device Enable Input. When input pin is high, DEV_OUT is high impedance. When input pin low, DEV_OUT is connected to TBT_OUT. |
10 | GND | ANALOG | Device Ground |
11, 12 | TBT_OUT | PWROUT | Power Output to Thunderbolt™ circuitry. This pin supplies power to the Thunderbolt™ controller. |
13, 14 | DEV_OUT | PWROUT | Power Output to peripheral device. This pin supplies power to circuitry not associated with the Thunderbolt™ controller or the Thunderbolt™ cable. It is intended to supply power to the peripheral device main function. |
15 | CPP | ANALOG | Charge Pump Capacitance Positive Output |
16 | CPN | ANALOG | Charge Pump Capacitance Negative Output |
17, 18 | PGND | GND | Buck Controller Power Ground |
19, 20 | SW | ANALOG | Buck Controller Switch Output |
21 | BOOT | ANALOG | Buck Controller Bootstrap |
22, 23 | TBT_IN | PWRIN | Power Input from Thunderbolt™ Cable. This pin is the power supply to the device. |
24 | COMP | ANALOG | Buck Converter Compensation. This pin provides compensation to the buck converter feedback loop. |