Texas Instruments TPS2226DB

Overview

TPS2226DB from Texas Instruments is a dual-slot CardBus power-interface switch that delivers controlled 3.3 V, 5 V, and 12 V to PC Card sockets with independent VCC/VPP switching, 140-µA typical quiescent current from 3.3-V input, break-before-make operation, and integrated thermal/short-circuit protection. It serves as the primary power distribution IC in notebook computers and portable embedded hosts requiring compliance with PC Card standards.

For engineers reviewing the TPS2226DB datasheet, TPS2226DB pinout, TPS2226DB application, or TPS2226DB equivalent, key selection criteria include its 30-pin HTSSOP package, dual 12-V–capable xVPP outputs (BVPP/AVPP), 1-A xVCC short-circuit limit, 2.5-Ω max rDS(on) for 12-V-to-xVPP paths, and support for serial interface control via DATA/CLOCK/LATCH pins.

Technical Context

The TPS2226DB implements two independent high-side power switches per slot-AVCC/BVCC for 3.3 V/5 V distribution and AVPP/BVPP for 3.3 V/5 V/12 V Vpp programming voltage-with separate enable logic and current-limit reporting via open-drain OC pin. Its control logic accepts serial 11-bit command words synchronized by CLOCK and latched by LATCH, supporting asynchronous SHDN and RESET inputs with internal pullups.

Each xVCC output features thermally compensated current limiting (1 A typical at TJ = 100°C), while xVPP outputs deliver up to 100 mA continuous with 300 mA short-circuit limit. UVLO thresholds are set at 2.7 V (3.3-V rail) and 2.5 V (5-V rail); POR asserts internal reset below 1.7 V on the 3.3-V input, ensuring safe power sequencing.

Key Specifications

Pinout & Package

TPS2226DB is housed in a 30-pin HTSSOP (DB-30) package with exposed thermal pad (PowerPAD™). Pin 1 is located at bottom-left corner when notch faces upward; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2224DB and TPS2216A, the TPS2226DB uniquely provides dual 12-V inputs (pins 7 & 24), full 30-pin pinout for enhanced thermal dissipation, and serial configurability-making it the only option among the three capable of independent 12-V Vpp delivery to both slots while supporting firmware-defined power policies.

Availability

TPS2226DB is available at Aetrix Electronics and suitable for notebook computers, bar code scanners, and digital cameras requiring stable component supply with guaranteed long-term manufacturability and full traceability.

Supply support for TPS2226DB 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 power management technologies with over 50 years of innovation in high-reliability interface ICs.

The TPS2226DB belongs to TI's CardBus power-switch family, engineered specifically to replace discrete MOSFETs, fuses, and sense resistors in PCMCIA-compliant host systems-delivering integrated protection, sequencing, and programmability in a single package.

FAQ

What is the maximum continuous current supported by the TPS2226DB on its xVPP outputs?

The TPS2226DB supports 100 mA continuous current on each xVPP output (AVPP and BVPP). This rating is specified at TJ = 100°C and aligns with PC Card requirements for flash memory programming voltage delivery. Short-circuit current is limited to 300 mA, with response time under 3 µs to protect downstream circuitry.

Does the TPS2226DB support 12-V switching on both AVPP and BVPP outputs?

Yes, the TPS2226DB supports 12-V switching on both AVPP (pin 8) and BVPP (pin 23) outputs. Unlike the TPS2223 and TPS2224, the TPS2226DB includes two dedicated 12-V input pins (7 and 24) that must be externally connected to supply 12 V to both Vpp outputs-enabling full dual-slot 12-V Vpp capability.

How does the TPS2226DB handle power sequencing between Vcc and Vpp rails?

The TPS2226DB enables independent control of Vcc and Vpp outputs via its 11-bit serial interface, allowing precise break-before-make sequencing. For example, AVCC can be enabled first, followed by AVPP after a programmable delay-ensuring compliance with PCMCIA hot-plug timing requirements and preventing latch-up in memory cards.

What thermal performance can be expected from the TPS2226DB in a 30-pin HTSSOP package?

In the 30-pin HTSSOP (DB-30) package with PowerPAD™, the TPS2226DB achieves 10.95 mW/°C derating above 25°C ambient, delivering 602 mW power dissipation at TA = 70°C. This thermal design supports sustained 1-A xVCC loads in compact notebook chassis without forced airflow, validated across −40°C to +85°C operating range.

Is the TPS2226DB pin-compatible with earlier devices in the TPS222x family?

No, the TPS2226DB is not pin-compatible with the 24-pin TPS2223DB or TPS2224DB due to its 30-pin DB package and expanded pin set-including dual 12-V inputs and additional AVCC/BVCC outputs. However, it shares functional equivalence and register mapping with the TPS2224DB for serial interface commands, easing firmware reuse.