Texas Instruments TPS2055PG4

Overview

TPS2055PG4 from Texas Instruments is a current-limited, high-side N-channel MOSFET power-distribution switch with active-high enable logic, 135-mΩ typical on-resistance at 5 V, 250 mA continuous output current, and integrated thermal/short-circuit protection for USB port power management in bus-powered hubs and peripherals.

For engineers reviewing the TPS2055PG4 datasheet, TPS2055PG4 pinout, TPS2055PG4 application, or TPS2055PG4 equivalent, key selection criteria include its 2.7–5.5 V input range, 0.44 A current-limit threshold, 2.5-ms typical rise time, undervoltage lockout (~2 V), and open-drain overcurrent (OC) flag for fault reporting in hot-plug systems.

Technical Context

The TPS2055PG4 implements an internal charge pump to drive the high-side N-MOSFET gate above the source, enabling full enhancement down to 2.7 V input while maintaining low r_DS(on). Its driver circuit controls slew rate to limit EMI and inrush surges during switching.

Current limiting operates via a sense FET that triggers constant-current mode when load exceeds ~0.44 A; thermal shutdown activates at ~140°C junction temperature with ~20°C hysteresis. The OC pin asserts low during overcurrent or overtemperature events and remains latched until fault removal.

Key Specifications

Pinout & Package

TPS2055PG4 is housed in an 8-pin PDIP (Plastic Dual-In-Line Package) with through-hole mounting and standard 0.3-inch body width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2055PG4, TPS2055D offers identical functionality in a smaller footprint but requires SMT placement, while AP2152H-AGN-7 trades away critical fault visibility for lower on-resistance and higher current limit-making it viable only in non-USB or simplified diagnostic systems.

Availability

TPS2055PG4 is available at Aetrix Electronics and suitable for USB bus-powered hubs, high-power peripherals, notebook expansion docks, industrial hot-swap modules, and embedded power-management systems requiring stable component supply across extended product lifecycles.

Supply support for TPS2055PG4 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 ICs, with decades of expertise in USB-compliant interface solutions and robust industrial-grade components.

The TPS20xx family was designed specifically for USB power distribution-delivering integrated current limiting, thermal protection, and controlled switching to simplify compliance with USB 1.1 hot-plug requirements in hubs and peripherals.

FAQ

What is the enable logic polarity of the TPS2055PG4?

The TPS2055PG4 features active-high enable logic: the power switch turns ON when EN (Pin 4) is driven high (≥2 V), and turns OFF when EN is pulled low (≤0.4 V at 2.7–4.5 V input). This differs from the TPS2045PG4, which uses active-low enable. The TPS2055PG4's EN input is compatible with both TTL and CMOS logic families across its full 2.7–5.5 V operating range.

Does the TPS2055PG4 provide reverse-current blocking?

Yes, the TPS2055PG4 implements bidirectional blocking: when disabled, it prevents current flow from OUT to IN as well as IN to OUT. This is achieved by the high-side N-MOSFET configuration combined with internal gate control, ensuring no backfeed occurs during hot-swap events or when downstream loads remain powered. This feature protects upstream supplies and meets USB specification requirements for port isolation.

How does the overcurrent (OC) pin behave during a short circuit?

During a short circuit, the TPS2055PG4's OC pin goes low (active) within microseconds and remains latched low as long as the overcurrent condition persists. It stays asserted even after the device enters thermal shutdown. The OC pin only returns high-Z (requiring external pull-up) once the fault is removed and the device recovers-either thermally or after current drops below the trip threshold. This allows reliable host-level fault detection without polling.

Can the TPS2055PG4 operate from a 3.3-V input supply?

Yes, the TPS2055PG4 operates fully across 2.7 V to 5.5 V, including 3.3 V. At 3.3 V input and 25°C, its typical r_DS(on) is 105 mΩ, resulting in ≤26 mV dropout at 250 mA. The internal charge pump ensures proper gate drive, and rise time extends to ~3 ms-still compliant with USB inrush limits. All specifications, including current limit (0.44 A) and UVLO (~2 V), remain valid at 3.3 V.

What is the thermal shutdown recovery behavior of the TPS2055PG4?

The TPS2055PG4 shuts down when junction temperature reaches ~140°C and automatically recovers once cooled by ~20°C (to ~120°C). During sustained overload, it cycles ON/OFF-delivering brief current pulses while limiting average power dissipation. This hiccup-mode operation prevents permanent damage and allows continued fault indication via the OC pin. Recovery is fully autonomous; no reset or enable toggling is required.