Texas Instruments TPS2226DBR

Overview

TPS2226DBR from Texas Instruments is a dual-slot CardBus power-interface switch IC 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, break-before-make operation, and integrated thermal/short-circuit protection. It serves as the primary power distribution controller in notebook computers and portable embedded systems requiring PCMCIA-compliant hot-swap power management.

For engineers reviewing the TPS2226DBR datasheet, TPS2226DBR pinout, TPS2226DBR application, or TPS2226DBR equivalent, key selection criteria include its 24-pin HTSSOP package, dual-output architecture (AVCC/AVPP and BVCC/BVPP), 12-V VPP support, 1-A xVCC short-circuit limit, and serial interface compatibility with legacy CardBus host controllers.

Technical Context

The TPS2226DBR implements two independent high-side power switches per slot-each with dedicated 3.3 V/5 V/12 V input routing and programmable output control via a 11-bit serial interface (DATA/CLOCK/LATCH). Its internal logic enforces break-before-make sequencing between VCC and VPP outputs to prevent card bus contention during voltage transitions.

It integrates UVLO on all supply rails (3.3 V, 5 V, 12 V), power-on reset (POR) with 1.7-V assertion threshold, open-drain overcurrent reporting (OC), and thermal shutdown at 135°C with 10°C hysteresis-enabling autonomous fault isolation without external supervision.

Key Specifications

Pinout & Package

TPS2226DBR is housed in a 24-pin HTSSOP (PowerPAD™) package (DB-24) with exposed thermal pad for enhanced heat dissipation. Pin pitch is 0.65 mm; body dimensions are 7.8 mm × 4.4 mm × 1.2 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2224DBR and TPS2216ADB, the TPS2226DBR uniquely combines full 12-V VPP support, serial configurability, and thermal/overcurrent autonomy - making it the only option among the three qualified for dual-slot, 12-V flash-programmable CardBus systems.

Availability

TPS2226DBR 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 assurance, and full PCMCIA specification compliance.

Supply support for TPS2226DBR 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 IC design.

The TPS2226DBR belongs to TI's CardBus power-interface switch product line, engineered specifically to replace discrete FET-based solutions in PCMCIA-compliant host systems while meeting stringent thermal, sequencing, and fault-protection requirements.

FAQ

What is the function of the OC pin on the TPS2226DBR?

The OC (Overcurrent) pin on the TPS2226DBR is an open-drain output that asserts low when either xVCC or xVPP output exceeds its respective current limit (1 A for xVCC, 200 mA for xVPP). It requires an external pullup resistor and provides sub-µs response time - 10 µs for xVCC shorts and 3 µs for xVPP shorts - enabling rapid host-level fault isolation. This signal is active during normal operation and remains functional across the full −40°C to +85°C temperature range.

Does the TPS2226DBR support 12-V VPP output?

Yes, the TPS2226DBR fully supports 12-V VPP output on pins 8 (AVPP) and 23 (BVPP), enabled by dual 12-V inputs on pins 7 and 24 that must be externally connected. Its rDS(on) for 12-V-to-xVPP paths is 2.5 Ω max at 100°C, allowing up to 50 mA continuous current with <125 mV drop - compliant with PC Card flash programming requirements. This distinguishes it from TPS2223/TPS2224, which omit 12-V support.

How does the TPS2226DBR implement break-before-make switching?

The TPS2226DBR enforces break-before-make switching through internal state-machine logic that guarantees a minimum dead time between turn-off of one output (e.g., VCC) and turn-on of another (e.g., VPP) on the same slot. This sequencing prevents simultaneous conduction that could cause bus contention or latch-up in PC Card interfaces. The timing is fixed in silicon and does not require external timing components or host software coordination.

What are the absolute maximum ratings for the 12-V inputs on the TPS2226DBR?

The absolute maximum rating for the 12-V inputs (pins 7 and 24) on the TPS2226DBR is −0.3 V to +14 V, as specified in the SLVS317 datasheet. Exceeding +14 V risks permanent damage. These pins are designed for nominal 12-V operation with a recommended operating range of +7 V to +13.5 V. Input current under normal conditions is 100 µA typical, rising to 180 µA max at 25°C - well within safe limits for standard 12-V regulator outputs.

Can the TPS2226DBR operate with only 3.3-V and 5-V supplies, omitting 12 V?

Yes, the TPS2226DBR can operate with only 3.3-V and 5-V supplies applied - the 12-V inputs (pins 7 and 24) may be left unconnected or tied to ground if 12-V VPP functionality is unused. All core functions - including AVCC/BVCC switching, serial interface, RESET/SHDN control, and OC reporting - remain fully operational. However, AVPP and BVPP outputs will be limited to 3.3 V or 5 V only, and the device retains full compliance with PC Card standards for 3.3-V/5-V-only cards.