Texas Instruments TPS2224PWPR

Overview

TPS2224PWPR from Texas Instruments is a dual-slot PC Card power-interface switch supporting independent 3.3 V, 5 V, and 12 V (VCC/VPP) distribution to two card sockets. It integrates current-limiting, thermal shutdown, open-drain overcurrent reporting (OC), break-before-make switching, and power-on reset. Designed for notebook computers and digital cameras requiring compliant CardBus power management.

For engineers reviewing the TPS2224PWPR datasheet, TPS2224PWPR pinout, TPS2224PWPR application, or TPS2224PWPR equivalent, key selection criteria include its 24-pin HTSSOP (PWP) package, 110 mΩ typical rDS(on) for 5 V → xVCC, 1 Ω typical rDS(on) for 3.3/5 V → xVPP, 120–300 mA short-circuit current limit on xVPP outputs, and support for TTL-compatible serial control via DATA/CLOCK/LATCH.

Technical Context

The TPS2224PWPR implements dual-channel, independently controllable power switches per socket: AVCC/BVCC deliver regulated 3.3 V or 5 V to card VCC pins, while AVPP/BVPP deliver selectable 3.3 V, 5 V, or 12 V to card VPP pins. Its control logic accepts serial commands (DATA/CLOCK/LATCH) and supports asynchronous SHDN and RESET inputs with internal pullups.

Each output features integrated current limiting (1 A for xVCC, 300 mA for xVPP at TJ = 25°C), thermal shutdown at 135°C with 10°C hysteresis, and output discharge resistors (0.7 kΩ for xVCC, 0.4 kΩ for xVPP). UVLO ensures Hi-Z operation if VI(3.3V) falls below 2.7 V or VI(5V) drops below 2.5 V.

Key Specifications

Pinout & Package

TPS2224PWPR is housed in a thermally enhanced 24-pin PowerPAD™ HTSSOP (PWP) package with exposed thermal pad, optimized for high-power dissipation (3322 mW at TA = 25°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2223PWPR and TPS2226DB, the TPS2224PWPR uniquely balances 12 V VPP support, 24-pin space efficiency, and 3322 mW thermal capacity - making it optimal for space-constrained portable hosts requiring full legacy flash compatibility.

Availability

TPS2224PWPR is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and bar code scanners requiring stable component supply across extended product lifecycles.

Supply support for TPS2224PWPR 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.

The TPS22xx family was engineered specifically for PC Card and CardBus host systems, delivering integrated, fuseless power switching with precise current limiting and serial configurability to meet PCMCIA compliance.

FAQ

What is the maximum continuous output current supported by TPS2224PWPR on its xVPP outputs?

The TPS2224PWPR supports a maximum continuous output current of 300 mA on each xVPP output (AVPP and BVPP) at TJ = 25°C. This is enforced by internal current limiting and remains functional up to TJ = 100°C, where the limit decreases slightly per datasheet curves. The 300 mA rating is designed to safely drive flash memory programming/erase cycles without external components.

Does TPS2224PWPR support 12 V on both AVPP and BVPP outputs simultaneously?

Yes, the TPS2224PWPR supports 12 V on both AVPP (Pin 8) and BVPP (Pin 19) outputs. Each output is independently controllable via serial interface or direct SHDN assertion. The device requires external connection of Pins 7 and 20 (12V inputs) to supply the 12 V rail, as specified in the functional block diagram and terminal functions table.

How does the OC (overcurrent) pin on TPS2224PWPR behave during a short circuit?

The OC pin on TPS2224PWPR is an open-drain output that pulls low within 3 µs of detecting a short on an xVPP output (e.g., 12 V to ground), and within 10 µs for xVCC shorts. It remains low until the fault clears and the internal current limiter resets. An external pullup resistor (typically 10 kΩ to 3.3 V) is required to generate a valid logic-high signal during normal operation.

Can TPS2224PWPR operate with only a 3.3 V supply, or is 5 V mandatory?

The TPS2224PWPR requires a valid 3.3 V supply on Pins 13/14 for all internal logic and biasing - this rail is mandatory. The 5 V supply on Pins 1/2/24 is only required when delivering 5 V to xVCC or xVPP outputs; it may be omitted if the design uses only 3.3 V VCC and 3.3/12 V VPP. However, VI(5V) must remain within absolute max ratings (−0.3 V to 5.5 V) even when unused.

What is the purpose of the LATCH, CLOCK, and DATA pins on TPS2224PWPR?

The LATCH, CLOCK, and DATA pins implement a 11-bit serial interface for configuring individual switch states (AVCC, BVCC, AVPP, BVPP), enabling/disabling outputs, and setting operational modes. Data is clocked in on the rising edge of CLOCK; LATCH latches the 11-bit word into control registers. This allows fine-grained, software-controlled power sequencing without requiring dedicated GPIOs per output.