73 mOhm on-resistance — the thermal budget anchor
The TPS2541RTER is a single-channel, high-side USB power switch from Texas Instruments. Its 73 mOhm typical Rds(on) sets the voltage drop and self-heating at the 2.5 A maximum continuous output — at full load the drop is roughly 180 mV, and the I²R loss is about 0.46 W.
USB VBUS voltage range with adjustable current limit
No separate Vcc/Vdd bias is required — the switch is self-powered from the load rail. The current limit is adjustable via an external resistor, which lets you set the trip point anywhere below the 2.5 A maximum. Fault protection includes overtemperature shutdown and undervoltage lockout (UVLO) that prevents the switch from turning on until the input is stable.
The status flag output (open-drain, active low) signals fault conditions like overcurrent or overtemperature to the host controller.