Texas Instruments TPS2205IDB

Overview

TPS2205IDB from Texas Instruments is a dual-slot PC Card power-interface switch IC that integrates MOSFETs, logic control, current limiting, and thermal protection for 3.3-V, 5-V, and 12-V card power distribution. It delivers 1 A continuous at 3.3 V and 1 A at 5 V per slot, features break-before-make switching, 140-mΩ rDS(on) for 5-V VCC paths, and supports PCMCIA-compliant hot-swap operation in notebook computers and PDAs.

For engineers reviewing the TPS2205IDB datasheet, TPS2205IDB pinout, TPS2205IDB application, or TPS2205IDB equivalent, key selection criteria include dual-slot VCC/VPP switching capability, 3.3-V low-voltage mode operation without 5-V input, integrated overcurrent reporting via OC pin, thermal shutdown behavior, and compatibility with Cirrus, Ricoh, O2Micro, Intel, and TI PCMCIA controllers.

Technical Context

The TPS2205IDB implements two independent power-switching channels (Slot A and Slot B), each supporting three voltage domains: VCC (3.3 V/5 V), VPP (3.3 V/5 V/12 V), and programmable VPP programming enable. It uses internal charge-pump circuitry to eliminate dependency on external 12-V supply for gate drive-enabling 12-V VPP to be disabled except during flash programming.

Control logic accepts discrete logic inputs (A_VCC3/A_VCC5/A_VPP_PGM/A_VPP_VCC and equivalents for Slot B) to configure output states, with built-in short-circuit current limiting (1 A for VCC, 150 mA for VPP) and thermal shutdown at TJ ≥ 150°C. The device operates across −40°C to 85°C ambient and supports break-before-make sequencing to prevent bus contention during voltage transitions.

Key Specifications

Pinout & Package

TPS2205IDB is housed in a 30-pin SSOP (DB) package with 0.65-mm pitch, 7.2-mm width, and exposed thermal pad not connected internally. Pin functions are validated per SLVS128E datasheet Rev. JANUARY 2001.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2201IDB, the TPS2205IDB eliminates VDD dependency and enables true 3.3-V-only operation; compared with TPS2205IDAPR, it offers identical functionality in a smaller SSOP footprint but with lower thermal headroom (1024 mW vs. 1625 mW).

Availability

TPS2205IDB is available at Aetrix Electronics and suitable for notebook computer design, PDA expansion interface development, and industrial docking station production requiring stable component supply and long-term PCMCIA interface support.

Supply support for TPS2205IDB 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 technologies.

The TPS2205IDB belongs to TI's PC Card interface power management product line, designed specifically to replace discrete MOSFET-based solutions in portable computing systems while meeting PCMCIA 2.1/3.0 electrical and sequencing requirements.

FAQ

What is the maximum continuous output current per VCC channel of the TPS2205IDB?

The TPS2205IDB supports 1 A continuous output current per VCC channel (AVCC and BVCC) at both 3.3 V and 5 V across the full operating temperature range. This rating is validated per the recommended operating conditions in SLVS128E, ensuring compliance with PCMCIA 3-W slot power limits while maintaining voltage regulation within specification.

Does the TPS2205IDB support 3.3-V-only operation without a 5-V input?

Yes, the TPS2205IDB supports true 3.3-V low-voltage mode: when VI(5V) = 0 V, bias current is derived solely from the 3.3-V input pins (15–17), and the device delivers 3.3 V to AVCC/BVCC. In this mode, rDS(on) increases to 180 mΩ, but the design accommodates ≤350 mA load while staying within 3.3-V regulation limits.

How does the TPS2205IDB handle overcurrent events?

The TPS2205IDB uses internal sense FETs to monitor each VCC and VPP output. Upon overcurrent detection, it linearly limits output current and asserts the open-drain OC pin low. If the condition persists and junction temperature reaches 150°C, thermal shutdown activates, disabling all outputs until cooling restores safe operation - no manual reset required.

Can the 12-V supply be omitted entirely in TPS2205IDB designs?

No - the 12-V input (Pins 7, 24) must be connected to a valid 12-V source when VPP programming is needed (e.g., flash memory erase/write). However, it can be disabled (left floating or switched off) during normal 3.3-V/5-V operation because the TPS2205IDB uses an internal charge pump for gate drive. Grounding 12-V inputs is prohibited.

What is the purpose of the SHDN pin on the TPS2205IDB?

The SHDN pin (Pin 14) is an active-high global shutdown control. When driven high, it disables all VCC and VPP outputs and reduces total quiescent current to ≤1 µA - critical for battery-powered sleep/pager modes. When low or floating (via internal pull-down), the device remains fully operational and responsive to control inputs.