The Texas Instruments TPS2204APWPRG4 is a PCMCIA power switch that routes 3.3V, 5V, or 12V to two PC Card slots — one output for VCC and one for VPP per slot, for a total of 4 outputs. Each output is rated for 1 A continuous, with a typical Rds(on) of 95 mOhm, so the voltage drop at full load stays under 100 mV — clean power for the card's logic and programming rails. A serial interface handles the switch control, and the status flag output tells the host if the output is on or if a fault has tripped — useful for the firmware engineer debugging a dead slot.
Protection and temperature range
Built-in fault protection includes current limiting (fixed threshold) and over-temperature shutdown — if a card shorts or the board runs hot, the switch folds back before the traces or the card itself let the smoke out.
It comes in a 24-HTSSOP package — that is a TSSOP with an exposed thermal pad underneath. The pad needs a good solder joint to the board's ground plane for the part to shed heat from the 1 A outputs. The rework tech should set the hot-air profile for a pad-under package; the exposed pad wicks heat fast.
The TPS2204APWPRG4 is listed as obsolete. For a board that needs this exact PCMCIA switch, the only channel is the independent surplus market.