What this load switch does for a power rail
It handles up to 2 A continuous current with a typical on-resistance of 60 mOhm, which keeps the voltage drop under 120 mV at full load — relevant when the downstream regulator has tight headroom. The switch is controlled by a single On/Off logic input; the input type is inverting, so a logic low on the enable pin turns the output on. No separate Vcc supply is needed — the part is self-powered from the load voltage. The slew-rate controlled feature limits inrush current during turn-on, which reduces supply droop on a shared bus and avoids false resets on adjacent ICs.
Reverse-current protection — when it matters
The TPS22916BLYFPR includes reverse-current protection. If the output voltage rises above the input — for instance, during a power-source handoff or when a bulk capacitor holds the rail high after the input is removed — the switch blocks back-feed. This prevents downstream loads from powering upstream circuitry through the body diode, which could otherwise keep a bus alive unintentionally or damage a weak source.
Package and layout — the 4-DSBGA reality
The part comes in a 4-bump DSBGA (4-XFBGA) package, supplier device package 4-DSBGA. The bump pitch is 0.5 mm; the overall body is approximately 0.8 mm x 0.8 mm. This is a wafer-level chip-scale package — no leads, no exposed thermal pad. The die attaches directly to the board, so the PCB landing pattern must match the TI-recommended footprint exactly. Solder mask defined pads are typical. For rework, hot air with a fine nozzle and low airflow is needed; the small mass heats quickly, so a gentle profile avoids lifting adjacent passives.
No external bias supply is needed, which simplifies the BOM.
It is a current TI product, listed as Active. The base product number is TPS22916; the suffix BLYFPR specifies the 4-DSBGA package and the reel/tape quantity.