Texas Instruments TPS2051P

Overview

TPS2051P from Texas Instruments is a 500 mA continuous-current, active-high enable, high-side N-channel MOSFET power distribution switch with 135 mΩ max R_DS(on) at 5 V, integrated short-circuit and thermal protection, and logic-level enable compatible with 3-V/5-V systems - used in USB host/port power management and hot-swap load control.

For engineers reviewing the TPS2051P datasheet, TPS2051P pinout, TPS2051P application, or TPS2051P equivalent, key selection criteria include its 0.9-A current-limit threshold, 2.5-ms typical rise time, undervoltage lockout (≈2 V), 10 µA standby supply current, and SOIC/PDIP package compatibility for industrial and embedded power-rail control.

Technical Context

The TPS2051P implements an internal charge pump to drive the N-channel MOSFET gate above the source voltage, enabling full enhancement down to 2.7 V input while maintaining controlled 2–4 ms rise/fall times to suppress EMI and inrush surges. Its current-sense FET architecture avoids series resistance loss and enables precise constant-current limiting without external components.

Thermal shutdown activates at ≈140°C junction temperature with ≈20°C hysteresis, and undervoltage lockout forces the switch off below ≈2 V input - both functions operate independently of enable state. The OC open-drain output asserts low during overcurrent or overtemperature events and remains latched until fault removal.

Key Specifications

Pinout & Package

TPS2051P is housed in an 8-pin plastic dual-in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051P, TPS2041P offers identical performance with reversed enable polarity - ideal for logic-matched legacy systems - while AP2151WG-7 trades UL recognition and through-hole compatibility for lower R_DS(on) and surface-mount footprint in cost-sensitive, non-safety-critical applications.

Availability

TPS2051P is available at Aetrix Electronics and suitable for USB host port protection, industrial hot-swap modules, and self-powered hub power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2051P 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 technologies with broad industrial, automotive, and communications portfolio coverage.

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

FAQ

What is the maximum continuous output current rating for the TPS2051P?

The TPS2051P is rated for 500 mA continuous output current at ambient temperatures from –40°C to 85°C. This rating assumes proper PCB thermal design and operation within the recommended input voltage range (2.7 V to 5.5 V). Exceeding this current continuously may trigger current-limit mode or thermal shutdown depending on load conditions and ambient temperature.

Does the TPS2051P require external components to operate?

No, the TPS2051P operates autonomously with no external components required for basic functionality. An internal charge pump eliminates the need for external boost circuitry, and protection functions (current limit, thermal shutdown, UVLO) are fully integrated. However, TI recommends a 0.1-µF ceramic bypass capacitor between IN and GND, and an RC filter on the OC pin may be added to suppress false triggers during high-inrush events.

How does the overcurrent (OC) pin behave during a fault condition?

The OC pin on the TPS2051P is an open-drain output that pulls low during overcurrent or overtemperature events and remains latched low until the fault is cleared. It requires an external pull-up resistor (typically to 3.3 V or 5 V) to generate a valid logic signal for microcontroller interrupt or status monitoring. Recovery is automatic once the load fault is removed and device temperature returns to safe operating range.

Can the TPS2051P be used in USB 2.0 applications?

Yes, the TPS2051P is explicitly designed for USB power distribution and meets key USB 2.0 requirements: it supports 5-V VBUS operation, provides controlled 2.5-ms rise time to limit inrush, delivers 500 mA per port, reports overcurrent via OC pin, and includes undervoltage lockout for safe hot-plug sequencing. It is widely deployed in USB hosts, self-powered hubs, and bus-powered function designs.

What is the thermal shutdown threshold and recovery behavior of the TPS2051P?

The TPS2051P initiates thermal shutdown when junction temperature reaches approximately 140°C. After shutdown, the device remains off until junction temperature falls by about 20°C - i.e., recovery occurs near 120°C. This hysteresis prevents oscillation during marginal overload conditions. The cycle repeats automatically until the fault is removed, providing fail-safe protection without external intervention.