Texas Instruments TPS2055P

Overview

TPS2055P from Texas Instruments is a 250 mA continuous-current, active-high enable, high-side N-channel MOSFET power-distribution switch with 135 mΩ on-resistance (at 5 V), integrated current limiting (0.44 A typical short-circuit limit), thermal shutdown, and open-drain overcurrent flag output - designed for USB bus-powered hub and peripheral hot-insertion applications.

For engineers reviewing the TPS2055P datasheet, TPS2055P pinout, TPS2055P application, or TPS2055P equivalent, this device delivers controlled inrush management, logic-level enable compatibility (3 V/5 V), undervoltage lockout (~2 V), and bidirectional switching capability in an 8-pin PDIP package suitable for industrial and computing power rail protection.

Technical Context

The TPS2055P implements an internal charge pump to drive the N-channel MOSFET gate above the source, enabling full enhancement down to 2.7 V input while maintaining low r_DS(on). Its driver circuit enforces 2.5 ms typical rise time and 4.4 ms fall time (at 5.5 V, 1 µF load) to suppress EMI and inrush surges.

Current sensing uses a matched sense FET-not a shunt resistor-enabling accurate, low-loss overload detection. Thermal protection activates at ~140°C junction temperature with ~20°C hysteresis, and undervoltage lockout disables the switch below ~2 V to ensure safe power-up sequencing.

Key Specifications

Pinout & Package

TPS2055P is housed in an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin 1 is GND; pins 2 and 3 are parallel IN inputs; pin 4 is active-high EN; pins 6–8 are paralleled OUT outputs; pin 5 is open-drain OC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2055P, TPS2045P offers identical performance with inverted enable polarity - ideal for logic-consistent designs - while AP2171SG-13 trades OC reporting for doubled current rating and lower on-resistance, better suited for non-USB applications where fault visibility is handled elsewhere.

Availability

TPS2055P is available at Aetrix Electronics and suitable for USB bus-powered hubs, notebook expansion docks, industrial hot-swap I/O modules, and digital camera power management requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for TPS2055P 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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The TPS20xx family was developed specifically for USB-compliant power distribution, addressing inrush control, hot-plug safety, and per-port current limiting in bus-powered and self-powered peripheral systems.

FAQ

What is the enable logic polarity of the TPS2055P?

The TPS2055P features active-high enable logic: the power switch turns on when the EN pin voltage exceeds 2 V (typical VIH), and turns off when EN falls below 0.4 V (typical VIL at 2.7–4.5 V input). This matches standard microcontroller GPIO outputs without level-shifting. The TPS2055P datasheet specifies VIH = 2 V min and VIL = 0.4 V max under recommended operating conditions.

Does the TPS2055P provide overcurrent reporting, and how is it implemented?

Yes, the TPS2055P provides overcurrent reporting via its open-drain OC pin, which pulls low during current-limit or thermal shutdown events. It requires an external pullup resistor (typically 10 kΩ to VCC) and asserts continuously until the fault is cleared. The OC pin is electrically isolated from the power path and rated for 10 mA sink current, making it directly interfaceable with most microcontrollers or USB hub controllers.

Can the TPS2055P operate from a 3.3 V supply, and what is its r_DS(on) at that voltage?

Yes, the TPS2055P operates across 2.7 V to 5.5 V, including 3.3 V nominal rails. At 3.3 V input and 25°C junction temperature, its typical r_DS(on) is 105 mΩ - resulting in a 26.3 mV drop at 250 mA. This remains within USB voltage tolerance margins and ensures reliable switching even at minimum input voltage.

How does the TPS2055P handle short-circuit conditions?

When a short occurs, the TPS2055P immediately enters constant-current mode at ~0.44 A (typical), limiting power dissipation and preventing catastrophic failure. If the short persists, junction temperature rises until thermal shutdown activates at ~140°C. The device then cycles on/off with ~20°C hysteresis until the fault is removed - all without external intervention or latch-up.

Is the TPS2055P pin-compatible with other devices in the TPS20xx family?

Yes, the TPS2055P shares identical 8-pin PDIP pinout and terminal functions with TPS2045P, TPS2045D, and TPS2055D. Only the enable polarity differs between TPS2045x (active-low) and TPS2055x (active-high); all electrical characteristics, timing, protection behavior, and package dimensions are fully aligned across the family.