Texas Instruments TPS2223DBR

Overview

TPS2223DBR from Texas Instruments is a dual-slot PC Card power-interface switch IC designed for controlled 3.3 V and 5 V distribution to CardBus sockets. It integrates two independent xVCC switched outputs (AVCC/BVCC), two xVPP outputs (AVPP/BVPP), overcurrent reporting (OC), thermal shutdown, and break-before-make switching. It supports TTL-compatible serial control (DATA/CLOCK/LATCH) and operates across −40°C to 85°C ambient - deployed in notebook computers and digital cameras requiring compliant PCMCIA power sequencing.

For engineers reviewing the TPS2223DBR datasheet, TPS2223DBR pinout, TPS2223DBR application, or TPS2223DBR equivalent, key selection considerations include its 24-pin HTSSOP package, absence of 12-V support on AVPP/BVPP, 110 mΩ typical rDS(on) at 750 mA for 3.3 V → xVCC paths, 140 µA quiescent current from 3.3 V, and integrated UVLO/POR with 2.7 V 3.3-V input threshold.

Technical Context

The TPS2223DBR implements a dual-channel, logic-controlled power switch architecture with independent VCC/VPP output enablement per slot. Its internal control logic accepts serial commands to configure AVCC/AVPP and BVCC/BVPP states, while hardware pins (SHDN, RESET) provide asynchronous override. All outputs feature current limiting (1 A for xVCC, 200 mA for xVPP), thermal trip at 135°C, and open-drain OC reporting.

Unlike the TPS2226, the TPS2223DBR omits 12-V input capability entirely - pins 7 and 20 are NC, and xVPP outputs deliver only 3.3 V or 5 V. Its 24-pin HTSSOP (DB) package supports surface-mount assembly with PowerPAD thermal enhancement, and it complies fully with PC Card Standard voltage regulation, timing, and fault-response requirements.

Key Specifications

Pinout & Package

TPS2223DBR is housed in a 24-pin HTSSOP (PowerPAD) package (DB-24), with exposed thermal pad for enhanced heat dissipation. Pin 1 is located at bottom-left corner when notch faces up; top view shown in datasheet Figure 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2224DBR and TPS2214DBR, the TPS2223DBR offers optimal balance of serial configurability, thermal performance via PowerPAD, and cost-effective omission of unused 12-V circuitry - making it the default choice for modern 3.3/5-V-only CardBus implementations.

Availability

TPS2223DBR is available at Aetrix Electronics and suitable for notebook computers, digital cameras, and bar code scanners requiring stable component supply with long-term industrial lifecycle support.

Supply support for TPS2223DBR 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.

The TPS2223DBR belongs to TI's CardBus power-interface switch product line, engineered specifically to meet PCMCIA standards for dual-slot portable computing systems with integrated protection and programmable control.

FAQ

What is the maximum continuous output current supported by TPS2223DBR on its xVCC outputs?

The TPS2223DBR supports up to 750 mA per xVCC output (AVCC and BVCC) at TJ = 25°C, with current limiting set to 1 A typical. At TJ = 100°C, the guaranteed minimum current remains 1 A for xVCC paths, ensuring robust operation under thermal stress. This rating aligns precisely with PC Card specification peak current requirements for 3.3-V and 5-V slots.

Does TPS2223DBR support 12-V output on its AVPP and BVPP pins?

No, the TPS2223DBR does not support 12-V output on AVPP or BVPP. Pins 7 and 20 are explicitly marked "NC" (no internal connection) for this device, and the datasheet confirms that 12-V functionality applies only to TPS2224 and TPS2226. The TPS2223DBR delivers only 3.3 V or 5 V on xVPP outputs - matching contemporary CardBus flash-memory needs without high-voltage circuitry.

How does the overcurrent reporting (OC) pin function on TPS2223DBR?

The OC pin on TPS2223DBR is an open-drain output that pulls low within 10 µs (xVCC) or 3 µs (xVPP) when a short-circuit or overcurrent condition is detected. It requires an external pullup resistor to VCC. When asserted, OC indicates which output channel is faulted - enabling host firmware to isolate and disable the affected slot without resetting the entire system. This behavior is confirmed in Figures 3–6 of the SLVS317 datasheet.

What is the purpose of the SHDN and RESET pins on TPS2223DBR?

The SHDN pin is an asynchronous active-low input that forces all xVCC and xVPP outputs into high-impedance state immediately, regardless of serial register contents. The RESET pin performs a deeper reset: it disables all outputs and activates internal discharge switches to safely bleed residual charge from card lines. Both pins feature internal pullup resistors, ensuring fail-safe default-off behavior during power-up or signal loss.

Can TPS2223DBR operate without a 5-V supply present?

No - the TPS2223DBR requires both 3.3 V (on pins 13/14) and 5 V (on pins 1/2/24) to function correctly. The 3.3-V supply is mandatory for internal logic and 3.3-V outputs; the 5-V supply is required for 5-V xVCC/xVPP operation and partially powers internal circuitry. Datasheet Section "Recommended Operating Conditions" explicitly states VI(3.3V) is required for all circuit operations, and 5 V is required for its respective functions - no graceful degradation mode exists.