Texas Instruments TPS2224DB

Overview

TPS2224DB from Texas Instruments is a dual-slot CardBus power-interface switch providing independent 3.3 V, 5 V, and 12 V switching to two PC Card sockets. It integrates VCC and Vpp switching with break-before-make logic, thermal/short-circuit protection, and 140-µA quiescent current. Designed for notebook computers and PDAs requiring compliant PC Card power management.

For engineers reviewing the TPS2224DB datasheet, TPS2224DB pinout, TPS2224DB application, or TPS2224DB equivalent, key selection criteria include its 24-pin HTSSOP package, dual 12-V–capable Vpp outputs, independent Vpp/VCC control, and support for PC Card Standard-compliant current limiting (1 A xVCC, 100 mA xVPP).

Technical Context

The TPS2224DB implements integrated high-side power switches with internal current-limit sensing and open-drain OC reporting. Its control logic accepts serial interface commands (DATA/CLOCK/LATCH) and asynchronous inputs (SHDN, RESET), enabling precise sequencing of dual-card power delivery without standby-mode pins.

It supports independent Vpp output selection per slot-AVPP/BVPP can be driven from 3.3 V, 5 V, or 12 V inputs-with dedicated 12-V input pins (7 and 20) and UVLO thresholds set at 2.4 V (3.3 V rail) and 2.3 V (5 V rail). Thermal shutdown triggers at 135°C with 10°C hysteresis.

Key Specifications

Pinout & Package

TPS2224DB is housed in a 24-pin HTSSOP (PowerPAD™) package (DB-24), thermally enhanced for high-current switching in space-constrained PC Card host designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-slot CardBus power management applications.

Compared with TPS2223DB and TPS2226DB, the TPS2224DB uniquely balances 12-V Vpp support, 24-pin compactness, and full dual-slot compliance - making it optimal for space-constrained portable hosts needing legacy flash-programming capability.

Availability

TPS2224DB is available at Aetrix Electronics and suitable for notebook computers, bar code scanners, and digital cameras requiring stable component supply across long-lifecycle industrial programs.

Supply support for TPS2224DB 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 company specializing in analog and embedded processing technologies.

The TPS222x family was designed specifically for PC Card and CardBus host systems, integrating power switching, protection, and serial control to replace discrete solutions in portable computing platforms.

FAQ

What is the primary function of the TPS2224DB in a CardBus host system?

The TPS2224DB serves as a dual-slot CardBus power-interface switch, delivering controlled 3.3 V, 5 V, and 12 V power to two PC Card sockets. It integrates VCC and Vpp switching, break-before-make logic, thermal/short-circuit protection, and serial configuration - eliminating discrete MOSFETs and sense resistors. The TPS2224DB ensures compliance with PCMCIA power sequencing and current requirements while enabling hot-plug reliability.

Does the TPS2224DB support 12-V Vpp output, and how is it implemented?

Yes, the TPS2224DB supports 12-V Vpp output on both AVPP (pin 8) and BVPP (pin 19). This is enabled by dedicated 12-V input pins (7 and 20), which must be externally connected per the datasheet. The device allows independent Vpp selection per slot - meaning one slot can be configured for 12 V while the other uses 3.3 V or 5 V - without shared constraints. The TPS2224DB's 12-V capability distinguishes it from the TPS2223DB, which has NC on those pins.

How does the TPS2224DB handle overcurrent conditions, and what is the response time?

The TPS2224DB provides overcurrent protection with dedicated current-limit circuits per output. For xVPP (12 V), it limits to 100 mA with a 3 µs response time from short onset to OC signal assertion. For xVCC (3.3 V/5 V), it limits to 1 A with a 10 µs OC response. The open-drain OC pin (15) requires an external pullup and drives low during fault, enabling rapid system-level fault isolation. The TPS2224DB also includes thermal shutdown at 135°C with 10°C hysteresis.

What package type is used for the TPS2224DB, and why is it suitable for portable designs?

The TPS2224DB uses a 24-pin HTSSOP (PowerPAD™) package (DB-24), optimized for thermal performance in high-current switching applications. Its exposed thermal pad improves heat dissipation in compact layouts, and the 0.65-mm lead pitch supports fine-pitch routing in space-constrained notebook and PDA PCBs. Unlike the 30-pin TPS2226DB, the DB-24 footprint reduces board area - making the TPS2224DB ideal for portable hosts where size and thermal efficiency are critical.

Can the TPS2224DB be used with a serial interface, and what signals are required?

Yes, the TPS2224DB supports a 3-wire serial interface using DATA (pin 3), CLOCK (pin 4), and LATCH (pin 5) for dynamic configuration and status monitoring. Commands include output enable/disable, Vpp source selection, and OC status readback. All three signals are TTL-compatible with internal pulldown (LATCH) or pullup (RESET, SHDN) - no external biasing needed. This interface allows software-defined power sequencing without requiring hardware redesign, enhancing flexibility in the TPS2224DB-based host system.