The TPS2559DRCR: This Rds(on) sets the voltage drop and self-heating at full load: at 5.5 A the conduction loss is under 400 mW, which the 10-VFDFN exposed-pad package (3x3 mm VSON) must sink through the thermal pad and board vias.
Adjustable current limiting and fault protection — USB and general-purpose rail fit
Fault protection includes adjustable current limiting, over-temperature shutdown, and undervoltage lockout (UVLO). The current limit is set with an external resistor, allowing the designer to tailor the trip threshold below the 5.5 A maximum for USB ports, peripheral rails, or point-of-load switches. The status flag output signals overcurrent or thermal fault conditions to the system controller.