Texas Instruments TPS2220ADB

Overview

TPS2220ADB from Texas Instruments is a single-slot CardBus™ power-interface switch IC designed to control 3.3 V, 5 V, and 12 V distribution to PC Card sockets. It integrates dual-channel VCC/VPP switching, break-before-make logic, thermal shutdown (135°C trip), current limiting (1 A xVCC / 300 mA xVPP), and 140-µA typical quiescent current from 3.3-V supply - enabling compliant, fuseless power management in notebook computers and industrial PCMCIA host controllers.

For engineers reviewing the TPS2220ADB datasheet, TPS2220ADB pinout, TPS2220ADB application, or TPS2220ADB equivalent, this page delivers verified technical context on its serial interface timing (2.5 MHz clock), dual-output architecture (AVCC/AVPP), HTSSOP-24 package constraints, and direct compatibility with PC Card Standard voltage sequencing and fault reporting via OC pin.

Technical Context

The TPS2220ADB implements independent TTL-compatible serial control (CLOCK/DATA/LATCH) for per-slot VCC and VPP output enable/disable, with asynchronous RESET and SHDN inputs. Its internal power switches feature integrated current-sense circuitry and fast short-circuit response (≤10 µs for 5 V xVCC, ≤3 µs for 5 V xVPP), triggering open-drain OC reporting.

UVLO thresholds are set at 2.4–2.9 V (3.3 V rail) and 2.3–2.5 V (5 V rail); POR asserts RESET internally below 1.7 V. Discharge paths (0.5–0.7 kΩ at xVCC, 0.2–0.4 kΩ at xVPP) ensure safe card hot-swap discharge. All outputs support Hi-Z states during shutdown or fault conditions.

Key Specifications

Pinout & Package

TPS2220ADB uses a 24-pin HTSSOP (DB) package with PowerPAD™ thermal enhancement. Pin 1 is top-left corner (marked dot), pin count increases left-to-right, top row then bottom row. Pins 6, 14, 16–19 are NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2223ADB and TPS2214ADB, the TPS2220ADB provides optimal single-slot integration with full 12-V VPP support, real-time OC fault signaling, and lowest rDS(on) in its family - making it the preferred choice for new notebook and portable host designs requiring PC Card Standard compliance.

Availability

TPS2220ADB is available at Aetrix Electronics and suitable for notebook computer host controllers, digital camera PC Card interfaces, and industrial set-top box expansions requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS2220ADB 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 solutions.

The TPS222x family was engineered specifically for PCMCIA-compliant CardBus host controllers, addressing stringent voltage regulation, sequencing, and fault-isolation requirements in portable and industrial computing platforms.

FAQ

What is the maximum supported clock frequency for the serial interface of the TPS2220ADB?

The TPS2220ADB serial interface supports a maximum clock frequency of 2.5 MHz, as specified in the Electrical Characteristics table. This timing allows reliable configuration of AVCC and AVPP output states within standard PCMCIA host controller cycle budgets. The TPS2220ADB datasheet confirms this value under recommended operating conditions with VI(3.3V) = 3.3 V and VI(5V) = 5 V.

Does the TPS2220ADB support 12-V output on both AVPP and BVPP channels?

No - the TPS2220ADB supports only a single AVPP output channel capable of delivering 12 V, and does not include BVPP functionality. BVPP is present only in dual-slot variants like TPS2223ADB and TPS2224ADB. The TPS2220ADB pinout explicitly shows pin 8 as AVPP and omits BVPP terminals, confirming its single-slot architecture.

How does the TPS2220ADB handle undervoltage lockout (UVLO) on the 3.3-V rail?

The TPS2220ADB asserts UVLO when the 3.3-V input falls below 2.4 V (min), with 100-mV hysteresis. Below this threshold, all switches enter Hi-Z state and discharge paths activate. This behavior is confirmed in the Electrical Characteristics table under "UVLO AND POR" section, ensuring safe power-down before logic corruption occurs.

Can the TPS2220ADB be used in place of the TPS2223ADB in a dual-slot design?

No - the TPS2220ADB is a single-slot device with only AVCC/AVPP outputs and lacks the BVCC/BVPP channels required for dual-slot operation. Its pinout contains no BVCC or BVPP terminals, and functional block diagrams confirm absence of second output stage. Substituting TPS2220ADB in a dual-slot design would leave one socket unpowered.

What is the purpose of the OC (overcurrent) pin on the TPS2220ADB?

Pin 15 (OC) is an open-drain output that pulls low when either AVCC or AVPP exceeds its current limit (1 A or 300 mA). It sinks up to 10 mA and requires an external pullup resistor. This pin enables host microcontrollers to detect overcurrent faults without polling, as documented in the Terminal Functions table and Functional Block Diagram of the TPS2220ADB.