The TPS22919DCKT is a single-channel high-side load switch from Texas Instruments, built around an N-channel MOSFET with a typical on-resistance of 89 mOhm. At 1.5 A continuous output, that resistance drops about 134 mV and dissipates roughly 200 mW — well within the SC-70-6 package's thermal budget at 25°C ambient, but worth checking against your load current and ambient temperature. The part operates from 1.6 V to 5.5 V on the load side and does not require a separate Vcc/Vdd bias supply, which simplifies the rail design for point-of-load switching in mixed-voltage systems.
Slew rate and load discharge — why they matter on a power-good sequence
The slew-rate controlled turn-on limits inrush current into downstream capacitive loads, which prevents the upstream regulator from drooping or hiccupping during power-up. The load discharge feature pulls the output to ground through an internal resistor when the switch is disabled — no floating output rail that could leave a downstream IC in an undefined state. Both features are integrated; no external pull-down or soft-start capacitor needed.
Short-circuit protection without the external sense resistor
Fault protection is built in: the TPS22919DCKT includes short-circuit protection that limits the output current during a fault event.
The 105°C ceiling gives headroom above the 85°C industrial standard for self-heating at the 1.5 A maximum output.