ExpressCard power switch with protection monitoring
The Texas Instruments TPS2231MRGPT is a high-side power switch designed specifically for ExpressCard slots, delivering up to 1.3 A per channel across three independent outputs. It integrates Power Good and Status Flag outputs for system-level monitoring of each power rail.
45 mOhm on-resistance — conduction loss at 1.3 A
Typical Rds(on) of 45 mOhm keeps conduction loss under 80 mW per channel at full load, which is manageable in the 20-QFN 4x4 mm package with exposed pad. Built-in fault protection includes fixed current limiting and over-temperature shutdown — no external sense resistor needed, saving board area in space-constrained card slot implementations.
Obsolete — last-time-buy and sourcing reality
The TPS2231MRGPT is marked as Obsolete in the lifecycle record. This means TI has discontinued production, and no further factory orders can be placed. Buyers should treat this as a last-time-buy part and secure inventory through independent distribution channels. No official replacement or cross-reference is listed in the available documentation. The TPS223 base product number suggests possible pin-compatible siblings within the family, but no direct successor has been announced. For existing designs, a qualified second source or redesign may be necessary.