The TPS2547RTET is a single-channel, high-side USB power switch from Texas Instruments. Its headline rating is a typical 73 mOhm on-resistance at 3 A continuous output, which means at full load the voltage drop across the switch is about 220 mV — well within the 4.75 V minimum allowed by USB 2.0 downstream port specs. The part integrates adjustable current limiting and over-temperature protection, and it carries a status flag output that goes low when the switch is in current-limit or thermal-shutdown.
Adjustable current limit — set the trip point per port load
The current limit is adjustable via an external resistor, not fixed at the factory. That means the same TPS2547RTET can be set for a 500 mA USB 2.0 port or a 1.5 A charging port by changing one resistor value — no BOM variant needed. The over-temperature protection shuts the switch off if the die exceeds the safe junction temperature, and the status flag reports the fault to the host controller.
It is not a commercial 0-70°C part; it is specced for outdoor telecom cabinets, engine-bay electronics, or factory-floor USB hubs where the ambient temperature can hit 85°C and the self-heating from 3 A adds another 20-30°C on the die.
16-WQFN (3x3 mm) — the footprint and the thermal pad
The package is a 16-lead WFQFN with an exposed pad, 3x3 mm body.