Texas Instruments TPS2205IDBR

Overview

TPS2205IDBR 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 at 3.3 V and 1 A at 5 V per slot, features break-before-make switching, 140-mΩ 5-V VCC switch resistance, and supports PCMCIA-compliant notebook and PDA systems.

For engineers reviewing the TPS2205IDBR datasheet, TPS2205IDBR pinout, TPS2205IDBR application, or TPS2205IDBR 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 (OC pin), shutdown control (SHDN), and compatibility with Cirrus, Ricoh, O2Micro, Intel, and TI PCMCIA controllers.

Technical Context

The TPS2205IDBR implements dual 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), with separate logic inputs (A_VCC3/A_VCC5/A_VPP_PGM/A_VPP_VCC and equivalents for Slot B). It uses internal charge-pump circuitry to eliminate dependency on external 12-V supply for gate drive except during flash programming.

Control logic enables break-before-make sequencing between voltage states, prevents simultaneous conduction, and supports 3.3-V-only operation via bias current derived from 3.3-V input pins. Thermal shutdown activates at TJ ≥ 150°C, and overcurrent detection triggers OC output assertion before thermal limit is reached.

Key Specifications

Pinout & Package

TPS2205IDBR is packaged in a 30-pin SSOP (DB) with 0.65-mm pitch, body size 7.2 × 8.2 mm, and exposed pad not present. 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-switching applications.

Compared with TPS2205IDBR, TPS2201IDBR requires mandatory 5-V presence and offers status outputs but no low-power 3.3-V mode, while MAX1681ESA+ lacks dual-slot capability, 12-V support, and fault reporting - making TPS2205IDBR the only option meeting full PCMCIA dual-slot, multi-voltage, and diagnostic requirements.

Availability

TPS2205IDBR is available at Aetrix Electronics and suitable for notebook computers, PDAs, digital cameras, and bar-code scanners requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for TPS2205IDBR 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 silicon technology for industrial, automotive, and computing markets.

The TPS2205 belongs to TI's PC Card power-management product line, designed specifically to replace discrete MOSFET solutions in dual-slot PCMCIA host controllers while meeting stringent PCMCIA voltage-transitioning, hot-swap, and power-efficiency requirements.

FAQ

What is the maximum continuous output current supported by TPS2205IDBR on its VCC outputs?

The TPS2205IDBR supports 1 A continuous per VCC output (AVCC and BVCC) at both 3.3 V and 5 V across the full operating temperature range (−40°C to 85°C). This rating is validated per PCMCIA 3 W slot power limit and accounts for worst-case rDS(on) and thermal derating in the 30-pin SSOP package.

Does TPS2205IDBR require an external 12-V supply to operate normally?

No. The TPS2205IDBR uses an internal charge pump to generate required gate-drive voltages, so the 12-V input is needed only during flash-memory programming. In all other modes - including 3.3-V-only operation - the 12-V supply can be disabled to extend battery life, as confirmed in the SLVS128E datasheet Section "12-V Supply Not Required".

How does the TPS2205IDBR implement overcurrent protection and reporting?

The TPS2205IDBR uses integrated sense FETs to monitor each VCC and VPP output. When overcurrent is detected, it linearly limits output current and asserts the open-drain OC pin low. This allows host microcontrollers to log faults or trigger warnings. If sustained, thermal shutdown disables all outputs until junction temperature falls below safe threshold.

Can TPS2205IDBR operate with only a 3.3-V input and no 5-V supply present?

Yes. The TPS2205IDBR supports 3.3-V low-voltage mode where VI(5V) = 0. Bias current is derived solely from the 3.3-V input pins, and only 3.3-V outputs are enabled. This mode is explicitly designed for sleep, pager, and low-power standby states in portable systems, as documented in the "Backward Compatibility and 3.3-V Low-Voltage Mode" section.

What is the function of the SHDN pin on TPS2205IDBR, and what happens when it is asserted?

The SHDN pin is an active-low global shutdown control. When pulled low, it forces all VCC and VPP outputs into high-impedance state and reduces total supply current to ≤1 µA. This enables ultra-low-power system suspend modes and is fully compatible with ACPI S3/S4 states in notebook platforms.