PCMCIA power switch — 4 outputs, 95 mOhm, triple-voltage load
The Texas Instruments TPS2224DBR is a PCMCIA power-distribution switch with four high-side outputs, each rated for 1 A maximum continuous current. The 95 mOhm typical Rds(on) sets the conduction loss floor. The 3:4 input-to-output ratio means three control inputs manage four switch outputs, a typical mapping for dual-slot PCMCIA controllers.
Fault protection and interface
Built-in fault protection includes fixed current limiting and over-temperature shutdown, so the switch self-limits under a shorted card or thermal overload without external sense resistors. A status-flag output reports fault conditions back to the host controller. Control is via a serial interface — the host writes the output-enable and slot-select bits through a serial protocol, reducing the GPIO count on the system controller compared to a parallel-controlled switch.