Texas Instruments TPS2051ADG4

Overview

TPS2051ADG4 from Texas Instruments is a single-channel, high-side N-channel MOSFET power-distribution switch with 80-mΩ on-resistance, 500 mA continuous current rating, active-high enable logic, and integrated overcurrent/thermal protection. It operates from 2.7 V to 5.5 V and is used in USB-powered peripherals, embedded system rail switching, and hot-swap interfaces where inrush control and fault isolation are critical.

For engineers reviewing the TPS2051ADG4 datasheet, TPS2051ADG4 pinout, TPS2051ADG4 application, or TPS2051ADG4 equivalent, key selection criteria include its 500 mA current limit, 2.5-ms typical rise time, 10 µA standby supply current, CMOS/TTL-compatible enable input, and SOIC-8 (D) package compatibility with industrial temperature range (0°C to 85°C).

Technical Context

The TPS2051ADG4 integrates an internal charge pump enabling gate drive above source voltage for full enhancement of its N-channel high-side switch - allowing operation down to 2.7 V input while maintaining low r_DS(on). Its current-limit circuit uses a sense FET (not a shunt resistor), minimizing conduction loss and enabling precise 0.9 A short-circuit threshold at 25°C.

Thermal protection employs dual-threshold sensing: at ~140°C junction temperature, only the faulted channel shuts off, preserving operation of other channels in multi-switch devices (though TPS2051ADG4 is single-channel). The OC output is open-drain and active-low, asserting during overcurrent or thermal events with <0.5 V low-level output at 10 mA sink.

Key Specifications

Pinout & Package

TPS2051ADG4 is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch, RoHS-compliant, and rated for 0°C to 85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2041ADG4, TPS2051ADG4 offers simplified control interface (no external inverter needed), while AP2171SG-13 trades built-in diagnostics for lower BOM count - making TPS2051ADG4 optimal for designs requiring autonomous fault containment and status visibility.

Availability

TPS2051ADG4 is available at Aetrix Electronics and suitable for USB peripheral power management, industrial I/O module rail control, and embedded hot-swap interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS2051ADG4 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 personal electronics markets.

The TPS205x family was designed specifically for robust, current-limited power distribution in USB-compliant and hot-plug-capable systems - emphasizing fault resilience, low quiescent power, and ease of integration without external components.

FAQ

What is the maximum continuous output current rating for the TPS2051ADG4?

The TPS2051ADG4 is rated for 500 mA continuous output current per channel under recommended operating conditions (2.7 V to 5.5 V input, 0°C to 85°C ambient). Its current-limit threshold is 0.9 A at 25°C, entering constant-current mode during overload - ensuring safe operation without immediate shutdown. This rating is validated across the full temperature range and accounts for thermal derating in the SOIC-8 package.

Does the TPS2051ADG4 require an external charge pump or gate driver?

No, the TPS2051ADG4 integrates a fully self-contained charge pump that generates the required gate-drive voltage above the source potential. This allows the N-channel high-side MOSFET to operate efficiently from as low as 2.7 V input without external components - eliminating the need for discrete charge pumps, bootstrap capacitors, or level-shifters typically required in high-side switch designs.

How does the overcurrent (OC) pin function on the TPS2051ADG4?

On the TPS2051ADG4, the OC pin is an open-drain output that pulls low during overcurrent or thermal fault conditions. It remains asserted until the fault is cleared and the device recovers. External pull-up (typically to 3.3 V or 5 V) is required. The OC signal sinks up to 10 mA at ≤0.5 V, enabling direct interfacing with microcontroller interrupt inputs or LED indicators for real-time fault detection and logging.

What is the purpose of the paralleled IN and OUT pins on the TPS2051ADG4?

The TPS2051ADG4 features paralleled IN (Pins 2,3) and OUT (Pins 6,7,8) terminals to reduce bond-wire resistance and improve current-handling capability within the SOIC-8 package. This design lowers effective r_DS(on) and thermal impedance, supporting the full 500 mA rating while maintaining reliability - unlike single-pin configurations that would risk overheating or voltage drop under sustained load.

Is the TPS2051ADG4 compatible with 3.3 V microcontroller GPIOs for enable control?

Yes, the TPS2051ADG4 EN pin is fully compatible with 3.3 V microcontroller GPIOs: its VIH (high-level input voltage) is specified at 2.0 V min across the full supply range, and it draws <0.5 µA input current. A 3.3 V logic high satisfies the enable threshold with margin, and the device's CMOS/TTL input structure ensures noise immunity and predictable switching without external buffering.