TPS22985 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Exact equivalent in functionality and parametrics to the compared device:
TPS22986 ACTIVE Thunderbolt™ Cable Power Mux (Also supports Thunderbolt 2) This product offers a wider adjustable current limit range (1-A to 5-A).

Product details


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  • 2.8 V to 19.8 V
  • Auto Selects 3.3 V Supply
  • > 10-mA Low Power Switch
  • > 500-mA High Power Switch
  • Reverse Current Blocking From OUT to VDD
  • Wake on UART Input Activity
  • UART RX and TX Buffers
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The TPS22985 is a supply selection device for active Thunderbolt cables. The device selects a supply that is at 3.3V from two supply inputs and connects this to two non-current limited outputs OUTA and OUTB. When 3.3V is not present at either supply, the outputs become high impedance.

The TPS22985 has two modes of operation, Normal and Control.

In Normal Mode, OUTA is always on when a valid supply is present. OUTB is connected to a valid VDD when the ENB input is high.

In Control Mode, OUTA functions the same as Normal Mode and OUTB is controlled by a combination of monitored inputs and valid supplies on VDD1 and VDD2. When a valid VDD is available, the device waits for a rising input on ENB and then disconnects OUTB until the next falling RXH transition. Once the next falling RXH transition occurs, the device reconnects OUTB.

In either mode, when a valid VDD is not available, the TPS22985 opens all switches and the outputs OUTA and OUTB become high impedance. When the connected VDD exceeds a maximum voltage of 3.6V, it is disconnected from the outputs. VDD2 will only connect when it is in the valid range and VDD1 is greater than 3.6V

The TPS22985 is available in a 1.6mm x 1.6mm WCSP package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet Thunderbolt Supply Selection IC datasheet (Rev. B) Jun. 06, 2012
Technical articles How can a load switch extend your device’s battery life? Mar. 20, 2018
Technical articles How and why you should use load switches for power sequencing Feb. 06, 2018
Technical articles How to use load switches and eFuses in your set-top box design Nov. 23, 2017
Technical articles Don’t leave it floating! Power off your outputs with quick output discharge Dec. 09, 2016
User guides TPS22985EVM User's Guide May 04, 2012

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