PCMCIA power switch — 95 mOhm Rds(on) and 4:2 input mux
The Texas Instruments TPS2220BPWP is a dual-output, high-side PCMCIA power switch designed to deliver VCC and VPP to PC Card slots. It integrates a 4:1 input multiplexer (4:2 ratio) to select from 3.3 V, 5 V, or 12 V rails, with a typical on-resistance of 95 mOhm per channel at 1 A continuous output.
Serial control and status flag for slot diagnostics
A serial interface programs the output voltage selection and enables independent control of each channel. The status flag output reports fault conditions — current limiting or over-temperature — so the host controller can respond before the card loses power.
Industrial temperature range, but obsolete — sourcing reality
However, Texas Instruments has marked this device as obsolete.
24-HTSSOP package — thermal pad layout note
The 0.65 mm pitch and 4.40 mm body width are standard for TSSOP-24, but the pad adds a thermal via requirement for high-current designs.