Texas Instruments TPS2055ADR

Overview

TPS2055ADR from Texas Instruments is a single-channel, active-high enable, current-limited high-side power-distribution switch with 80-mΩ N-channel MOSFET, 250 mA continuous output current, 2.7–5.5 V input range, and integrated overcurrent/thermal protection. It serves as a fault-protected power rail switch in USB peripheral ports and low-power embedded systems.

For engineers reviewing the TPS2055ADR datasheet, TPS2055ADR pinout, TPS2055ADR application, or TPS2055ADR equivalent, key selection criteria include its active-high enable logic, 2.5-ms typical rise time, 10 µA standby supply current, open-drain OC output for fault signaling, and SOIC-8 (D) package compatibility with space-constrained PCB layouts.

Technical Context

The TPS2055ADR integrates an internal charge pump enabling full gate drive down to 2.7 V input, eliminating external components while controlling MOSFET rise/fall times to suppress inrush current and EMI. Its current-sense FET architecture provides accurate overload detection without series resistance penalty.

It implements dual-threshold thermal protection: at ~140°C junction temperature, only the faulted channel shuts down-preserving operation of other channels in multi-switch packages-while hysteresis enables automatic recovery after ~20°C cooldown. Undervoltage lockout activates below ~2 V input.

Key Specifications

Pinout & Package

TPS2055ADR is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch. Pin functions are validated per TI SLVS251C datasheet revision January 2008.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side power switch applications.

Compared with TPS2045ADR and AP2171SG-13, the TPS2055ADR uniquely combines active-high enable, integrated OC reporting, and per-channel thermal fault isolation-making it optimal for USB-compliant, fault-aware embedded power distribution where control simplicity and diagnostics are prioritized over minimal footprint.

Availability

TPS2055ADR is available at Aetrix Electronics and suitable for USB peripheral protection, industrial sensor node power gating, embedded display backlight control, and medical diagnostic subsystem isolation requiring stable component supply and long-term manufacturability.

Supply support for TPS2055ADR 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 delivering analog, embedded processing, and connectivity solutions with broad industrial, automotive, and communications reach.

The TPS20xxA family was designed specifically for robust, current-limited power distribution in systems exposed to heavy capacitive loads and short circuits-targeting USB, docking stations, and modular embedded equipment.

FAQ

What is the maximum continuous output current rating for the TPS2055ADR?

The TPS2055ADR is rated for 250 mA continuous output current per channel under recommended operating conditions (VI(IN) = 2.7 V to 5.5 V, TA = 0°C to 85°C). This rating is enforced by internal current-limit circuitry that transitions the MOSFET into constant-current mode above the threshold, preventing damage during sustained overload. The device also features thermal shutdown at ~140°C junction temperature as a secondary protection layer.

Does the TPS2055ADR require external components for basic operation?

No, the TPS2055ADR operates autonomously with no mandatory external components. Its integrated charge pump eliminates need for external capacitors, and internal biasing supports direct connection to 2.7–5.5 V supplies. However, TI recommends a 0.1 µF ceramic capacitor between IN and GND (close to pins), and optionally a 22 µF electrolytic capacitor on OUT for heavy loads-both improve stability and transient response but are not required for functional enable/disable behavior.

How does the overcurrent (OC) pin function on the TPS2055ADR?

The OC pin on the TPS2055ADR is an open-drain, active-low output asserted during overcurrent or thermal fault conditions. When tripped, it sinks current (up to 10 mA) and pulls low-requiring an external pull-up resistor (typically 10 kΩ to VI(IN)) to generate a valid logic signal. The OC remains low until the fault condition clears and internal recovery completes, providing unambiguous fault latching for host MCU monitoring without software polling overhead.

What is the enable logic polarity of the TPS2055ADR, and how does it differ from the TPS2045ADR?

The TPS2055ADR uses active-high enable logic: the power switch turns on when EN is driven to VI(IN) (≥2 V), and turns off when EN is pulled to GND. In contrast, the TPS2045ADR uses active-low enable logic-its switch activates when EN is low. Both share identical pinout, package, and electrical performance; the sole functional difference is enable polarity, making them non-interchangeable without adjusting control signal routing or logic inversion.

Can the TPS2055ADR safely drive a 220 µF capacitive load during power-up?

Yes, the TPS2055ADR is explicitly characterized for safe inrush management into large capacitive loads: Figure 9 in the datasheet shows clean current waveforms with 47 µF, 100 µF, and 220 µF output capacitance. Its 2.5-ms typical rise time limits peak inrush to <1 A even with 220 µF, avoiding voltage droop on shared rails and contact arcing in connectors-making it suitable for hot-plug applications like USB peripherals and modular backplanes.