Texas Instruments TPS2220BDB

Overview

TPS2220BDB from Texas Instruments is a single-slot PCMCIA power-interface switch IC that integrates 3.3 V, 5 V, and 12 V switching for AVCC and AVPP outputs with independent VPP/VCC control, 1 A AVCC short-circuit current limit, 100 mA AVPP current limit, and break-before-make switching - used in notebook computers and bar code scanners to meet PC Card™ standards.

For engineers reviewing the TPS2220BDB datasheet, TPS2220BDB pinout, TPS2220BDB application, or TPS2220BDB equivalent, key selection considerations include its 24-pin SSOP package, TTL-compatible serial interface (CLOCK/DATA/LATCH), thermal shutdown at 135°C, 140 µA typical quiescent current from 3.3 V, and dual-rail discharge capability for PC Card reset compliance.

Technical Context

The TPS2220BDB implements a serial-control logic architecture with asynchronous RESET and SHDN inputs, internal charge-pump gate drive enabling 12 V switching without external 12 V rail dependency, and independent UVLO thresholds per input rail (2.7 V for 3.3 V, 2.5 V for 5 V). It supports PCMCIA-compliant voltage transitioning: 5 V power-up followed by 3.3 V enable after card detection and discharge.

Its protection system combines per-output current limiting (1 A AVCC, 200 mA AVPP typ.) with fast response (<10 µs), active-low OC reporting, and thermal shutdown with 10°C hysteresis. Discharge transistors on AVCC and AVPP outputs ensure <100 ms discharge to <0.8 V - satisfying PC Card specification requirements for 3.3 V–compatible card reset.

Key Specifications

Pinout & Package

TPS2220BDB is housed in a 24-pin SSOP (DB-24) package with exposed pad for thermal enhancement. Pin 20 is NC (no internal connection); all other pins match TPS2220BPWP pinout except this distinction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCMCIA power-switching applications.

Compared with TPS2220BPWP, TPS2220BDB offers identical functionality in a space-constrained SSOP package but with lower thermal capacity; compared with TPS2220ADB, it adds critical 12 V support and independent rail control required for full PC Card compliance.

Availability

TPS2220BDB is available at Aetrix Electronics and suitable for notebook computers, bar code scanners, digital cameras, and set-top boxes requiring stable component supply, long-term lifecycle support, and PCMCIA specification compliance.

Supply support for TPS2220BDB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies with broad industrial and computing portfolio coverage.

The TPS2220BDB belongs to TI's PCMCIA power-interface switch product line, designed specifically to replace discrete FETs, fuses, and control logic in single-slot host controllers while meeting PC Card™ mechanical, electrical, and timing specifications.

FAQ

What is the primary function of the TPS2220BDB in a PCMCIA host system?

The TPS2220BDB serves as an integrated power-interface switch that controls and protects the 3.3 V, 5 V, and 12 V power rails delivered to a single PC Card slot. It manages AVCC and AVPP outputs with independent switching, implements current limiting and thermal shutdown, and provides serial configuration and fault reporting - eliminating the need for discrete MOSFETs, fuses, and external discharge circuitry in designs using the TPS2220BDB.

Does the TPS2220BDB require an external 12 V supply to operate?

No - the TPS2220BDB uses an internal charge pump powered from the mandatory 3.3 V input to generate gate drive voltages, allowing the external 12 V supply to remain disabled until needed by the inserted card. When 12 V is present and requested, the TPS2220BDB automatically draws charge-pump current from the 12 V rail to reduce loading on the 3.3 V supply - a key power-saving feature of the TPS2220BDB.

How does the TPS2220BDB ensure compliance with PC Card 3.3 V transition requirements?

The TPS2220BDB integrates dedicated discharge transistors on both AVCC and AVPP outputs, actively pulling them to ground when commanded. This ensures AVCC discharges to <0.8 V within 100 ms - satisfying the PC Card specification requirement for safe 3.3 V–compatible card reset. The discharge resistance is specified at 0.7 kΩ (AVCC) and 0.4 kΩ (AVPP), guaranteeing compliance without external components in the TPS2220BDB design.

What is the role of the OC pin on the TPS2220BDB?

The OC (Overcurrent) pin on the TPS2220BDB is an open-drain output that asserts low whenever any AVCC or AVPP output enters current-limit mode - indicating a short circuit or overload condition. It allows the host microcontroller to detect and diagnose faults in real time. An external pullup resistor is required, and the TPS2220BDB's OC signal remains active until the fault clears or the device resets via SHDN or RESET.

Can the TPS2220BDB be used in new designs, or is it obsolete?

Yes - the TPS2220BDB is listed as Active in TI's official ordering information and remains supported for new designs requiring PCMCIA-compliant power switching. Its DB-24 SSOP package and full feature set (including 12 V support, independent VPP/VCC, and serial interface) make it suitable for industrial, medical, and legacy-computing applications where PC Card expansion remains relevant. Aetrix Electronics maintains active inventory and long-term supply commitment for the TPS2220BDB.