The TPS22920LYZPT is a single-channel, high-side load switch from Texas Instruments with a typical on-resistance of 5.3 mOhm. At 4 A continuous output, that works out to about 85 mW of conduction loss — low enough that the 8-DSBGA package can handle it without a heatsink in most board environments. The load voltage range spans 0.75 V to 3.6 V, so it covers 0.8 V core rails, 1.2 V memory, 1.8 V, 2.5 V, and 3.3 V I/O rails in a single BOM line.
Load discharge and slew rate — what they do for the rail
The integrated load discharge pulls the output to ground when the switch is turned off, preventing a floating output that could hold a downstream device in an undefined state. The slew-rate control limits inrush current during turn-on, which matters when the load has a large bypass capacitance — without it, the sudden current draw could droop the upstream supply rail.
Package reality: 8-DSBGA at 1.9 x 0.9 mm
The 8-DSBGA (1.9 x 0.9 mm) is a 0.5 mm pitch wafer-level package.