The Texas Instruments TPS22985YFPR is a Thunderbolt™ series high-side load switch with two outputs and a 1:2 input-to-output ratio. It handles a load voltage from 2.8 V to 19.8 V, covering the Thunderbolt power-rail range plus general-purpose 5 V, 12 V, and 19 V supplies in notebooks, docking stations, and peripheral hubs. The switch integrates reverse-current fault protection, which blocks back-feed when the output voltage exceeds the input — critical in hot-plug and multi-rail systems where a downstream capacitor can hold the rail high during a source brownout.
Two internal switches — why the dual Rds(on) matters
The part lists two Rds(on) maximums: 5 Ohm and 250 mOhm. This indicates one switch is sized for low-current signal or auxiliary rails (5 Ohm path), while the other handles the main power delivery (250 mOhm path). The 250 mOhm switch passes several amps at 19.8 V with manageable conduction loss; the 5 Ohm switch suits sub-100 mA loads where inrush limiting or fault isolation is the priority.
NRND — plan your BOM transition
That means TI is not accepting new-design-in activity; existing production runs may continue, but the part is on a path toward end-of-life. For a new BOM, look at the current Thunderbolt switch family — the TPS22986 or TPS22988 series offers similar dual-output high-side switching with active lifecycle support.
16-DSBGA — layout and assembly notes
The 16-DSBGA package measures 1.6 mm x 1.6 mm with a 0.4 mm ball pitch. The small footprint and fine pitch demand a controlled-impedance PCB stack-up with micro-via fan-out under the BGA.