Texas Instruments TPS25942LRVCR

Overview

TPS25942LRVCR from Texas Instruments is a 2.7 V–18 V, 5-A eFuse Power MUX IC with integrated back-to-back FETs, 42 mΩ typical R_ON, ±8% adjustable current limit (0.6 A–5.3 A), and reverse current blocking for power path management in redundant DC systems.

For engineers reviewing the TPS25942LRVCR datasheet, TPS25942LRVCR pinout, TPS25942LRVCR application, or TPS25942LRVCR equivalent, this device supports precise in-rush control via dV/dt programming, real-time current monitoring (IMON), and dual fault response modes-critical for PCIe cards, SSDs, and industrial PLCs requiring robust overvoltage, undervoltage, and thermal protection.

Technical Context

The TPS25942LRVCR implements a latched fault response (L-suffix) with integrated bidirectional FETs enabling true reverse voltage shutoff (<1 µs) and non-ideal diode mode via DMODE pin. It monitors V(IN)–V(OUT) differentially to enforce reverse blocking when V(IN) < (V(OUT) – 10 mV).

Protection thresholds-including UVLO (2.3 V ±116 mV), OVP (0.99 V ±8 mV referenced to PGTH), and fast-trip comparator (1.5×I_LIM + 0.375 A)-are programmable via external resistors on EN/UVLO, OVP, and ILIM pins, while dV/dt ramp rate is set by capacitor on dVdT pin.

Key Specifications

Pinout & Package

TPS25942LRVCR uses a 20-pin WQFN package (3.0 mm × 4.0 mm) with exposed thermal pad requiring multi-via connection to PCB ground plane for optimal thermal performance (R_θJB = 13.6°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar eFuse power mux applications.

Compared with TPS25942ARVCR and TPS25944LRVCR, the TPS25942LRVCR uniquely combines latched fault isolation with precise current limiting and thermal foldback - making it optimal for systems where persistent fault containment and stable current delivery under overload are mandatory design requirements.

Availability

TPS25942LRVCR is available at Aetrix Electronics and suitable for PCIe cards, industrial PLCs, and enterprise SSDs requiring stable component supply, long-term lifecycle support, and full compliance with UL 2367 and UL60950 standards.

Supply support for TPS25942LRVCR 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 decades of automotive, industrial, and computing design expertise.

The TPS25942x family was engineered specifically for high-reliability power path management in systems demanding programmable protection, reverse current blocking, and seamless source arbitration - targeting data center, industrial automation, and mobile computing platforms.

FAQ

What is the fault response behavior of the TPS25942LRVCR?

The TPS25942LRVCR implements a latched fault response: upon detection of overvoltage, undervoltage, reverse voltage, or thermal shutdown, the FLT pin asserts low and the internal FET remains off until the EN/UVLO pin is actively pulled to GND. This ensures persistent isolation during sustained faults - a critical safety feature for industrial and computing applications where uncontrolled re-engagement could damage downstream circuitry. The TPS25942LRVCR does not auto-retry.

How is the current limit programmed on the TPS25942LRVCR?

The current limit of the TPS25942LRVCR is set using a resistor (R_ILIM) connected between the ILIM pin (pin 17) and GND. With an internal bias voltage of 0.87 V, R_ILIM values from 16.9 kΩ to 150 kΩ yield a programmable I_LIM range of 0.6 A to 5.3 A (±8%). For example, a 20 kΩ resistor sets I_LIM ≈ 4.45 A. The TPS25942LRVCR datasheet provides a full lookup table correlating resistance to current limit across temperature.

Does the TPS25942LRVCR support reverse current blocking, and how fast is it?

Yes, the TPS25942LRVCR provides true reverse current blocking by continuously monitoring V(IN) – V(OUT). When V(IN) falls below (V(OUT) – 10 mV), the device shuts off the internal FET within 1 µs - faster than discrete solutions and sufficient to prevent backfeed in hot-swap and redundant supply configurations. This capability eliminates the need for external back-to-back MOSFETs and reduces BOM count and layout area.

What package type and thermal characteristics does the TPS25942LRVCR use?

The TPS25942LRVCR is housed in a 20-pin WQFN package (3.0 mm × 4.0 mm) with an exposed thermal pad (PowerPAD™). Its junction-to-board thermal resistance (R_θJB) is 13.6°C/W, and recommended layout requires multiple thermal vias connecting the PowerPAD directly to a solid PCB ground plane. This configuration supports continuous 5 A operation at +85°C ambient when properly implemented - verified per TI's thermal characterization data.

Can the TPS25942LRVCR be used in systems requiring UL certification?

Yes, the TPS25942LRVCR is UL 2367 Recognized (File No. 169910) and compliant with UL60950 for safe operation during single-point failures - including open or shorted ILIM resistors. Its internal open-short ILIM detection, latched fault response, and validated thermal shutdown behavior meet the stringent reliability and safety requirements of industrial, medical, and enterprise equipment where regulatory approval is mandatory.