Texas Instruments TPS2205IDAP

Overview

TPS2205IDAP from Texas Instruments is a dual-slot PC Card power-interface switch IC that integrates VCC and Vpp switching for 3.3-V, 5-V, and 12-V card power distribution. It delivers 1-A continuous 3.3-V VCC output, 1-A 5-V VCC output, and 150-mA 12-V Vpp output with break-before-make switching, short-circuit protection, and thermal shutdown. It enables low-power 3.3-V-only operation in sleep/pager modes for notebook computers and PDAs.

For engineers reviewing the TPS2205IDAP datasheet, TPS2205IDAP pinout, TPS2205IDAP application, or TPS2205IDAP equivalent, key selection criteria include its dual-card 3.3/5/12-V switching capability, 110-mΩ 3.3-V rDS(on), integrated overcurrent reporting (OC pin), 32-pin TSSOP (DAP) package, and compatibility with PCMCIA-compliant controllers from Intel, TI, Cirrus, Ricoh, and O2Micro.

Technical Context

The TPS2205IDAP implements two independent power-switching channels (Slot A and Slot B), each supporting VCC (3.3 V or 5 V) and Vpp (3.3 V, 5 V, or 12 V) outputs via internal N-channel MOSFETs with integrated gate charge pumps. Control logic accepts dedicated input pins (e.g., A_VCC3, A_VPP_PGM) to select voltage source and enable state per rail.

It features dual-stage overcurrent protection: current-limiting sense-FETs provide linear foldback without external resistors, while the OC pin asserts low during fault conditions. Thermal shutdown activates at TJ ≥ 150°C, and shutdown mode reduces quiescent current to ≤1 µA when SHDN is asserted.

Key Specifications

Pinout & Package

TPS2205IDAP uses a 32-pin TSSOP (DAP) package with 0.65-mm pitch, exposed thermal pad, and JEDEC MO-153 compliant footprint. Pin 1 is located at top-left corner (marking dot adjacent).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2201IDBR, TPS2205IDAP adds 3.3-V-only operation and removes redundant status pins, simplifying low-power designs; compared with TPS2205IDFR, it offers superior thermal performance in space-constrained layouts due to DAP's smaller footprint and exposed pad.

Availability

TPS2205IDAP is available at Aetrix Electronics and suitable for notebook computers, PDAs, and digital cameras requiring stable component supply, long-term lifecycle support, and PCMCIA-compliant power switching.

Supply support for TPS2205IDAP 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs for industrial, automotive, and computing markets.

The TPS2205 product line was designed specifically for PC Card (PCMCIA) host systems, integrating dual-slot VCC/Vpp switching, protection, and controller interface logic to replace discrete MOSFETs, fuses, and supervisors in portable computing platforms.

FAQ

What is the maximum continuous output current supported by the TPS2205IDAP on its 3.3-V VCC rail?

The TPS2205IDAP supports 1 A continuous output current on each 3.3-V VCC rail (AVCC and BVCC). This is specified over the full operating temperature range (−40°C to +85°C) and meets PCMCIA regulation requirements with ≤200 mV drop at rated load, enabled by its 110-mΩ typical rDS(on) in 3.3-V mode. The TPS2205IDAP maintains this rating even when powered solely from the 3.3-V input (VI(5V) = 0).

Does the TPS2205IDAP require an external 12-V supply to operate normally?

No, the TPS2205IDAP does not require an external 12-V supply for normal operation. Its internal charge pump generates necessary gate-drive voltages from the 3.3-V or 5-V inputs. The 12-V input is needed only during Flash memory programming/erase cycles. Leaving the 12-V inputs unconnected (not grounded) when unused reduces system power consumption and extends battery life in portable devices using the TPS2205IDAP.

How does the TPS2205IDAP handle overcurrent conditions, and what role does the OC pin play?

The TPS2205IDAP uses internal sense-FETs to monitor current on each VCC and Vpp output. During overcurrent, it enters linear current-limit mode to protect downstream circuitry. Simultaneously, it asserts the OC pin low to signal the host microprocessor. This allows real-time diagnostics and user alerts without interrupting system operation. If the fault persists and junction temperature reaches 150°C, thermal shutdown disables all outputs until safe cooling occurs - a critical safety feature built into the TPS2205IDAP.

Can the TPS2205IDAP be used in systems that only provide 3.3-V power, such as battery-powered sleep modes?

Yes, the TPS2205IDAP supports full 3.3-V-only operation (VI(5V) = 0), known as its low-voltage mode. In this mode, bias current is derived entirely from the 3.3-V input, and only 3.3-V VCC outputs are enabled. The TPS2205IDAP maintains 1-A continuous capability on AVCC/BVCC with 110-mΩ rDS(on), making it ideal for sleep, pager, or suspend states in notebooks and PDAs where higher voltages are unavailable - a core design feature of the TPS2205IDAP.

What is the purpose of the break-before-make switching architecture in the TPS2205IDAP?

The break-before-make switching in the TPS2205IDAP ensures that one voltage source (e.g., 3.3 V) is fully disconnected before another (e.g., 5 V) is connected to the same VCC rail. This prevents momentary short-circuits between incompatible supplies during hot-plug or protocol-driven voltage transitions - a mandatory requirement for PCMCIA-compliant systems. It eliminates bus contention and potential latch-up, directly enhancing system reliability in dual-voltage PC Card applications using the TPS2205IDAP.