Texas Instruments TPS25944LRVCT

Overview

TPS25944LRVCT 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, programmable 0.6 A–5.3 A current limit (±8%), and 4 ms fault timer shutdown. It provides reverse current blocking, dV/dt control, PGOOD/FLT status outputs, and IMON analog current monitoring - deployed in redundant power supplies and PCIe/NIC hot-swap systems.

For engineers reviewing the TPS25944LRVCT datasheet, TPS25944LRVCT pinout, TPS25944LRVCT application, or TPS25944LRVCT equivalent, key selection criteria include its latched fault response mode, UL 2367 recognition (File No. 169910), ±2% OVP/UVLO thresholds, and WQFN-20 (3.0 mm × 4.0 mm) thermal performance with R_θJB = 13.6 °C/W.

Technical Context

The TPS25944LRVCT implements a dual-FET power path architecture enabling bidirectional current control and true reverse voltage shutoff (<1 µs) when V_IN < (V_OUT – 10 mV). Its DMODE pin configures non-ideal diode mode for supply priority arbitration between main/auxiliary rails.

It integrates independent comparators for overvoltage (OVP), undervoltage (EN/UVLO), reverse voltage (V_IN–V_OUT), and fast-trip overcurrent (1.5×I_LIM + 0.375 A), all feeding into a latched fault state via open-drain FLT output - distinct from the auto-retry behavior of TPS25944A variants.

Key Specifications

Pinout & Package

TPS25944LRVCT uses a 20-pin WQFN package (3.0 mm × 4.0 mm, 0.5 mm pitch) with exposed thermal pad requiring PCB ground plane connection via multiple vias for R_θJB = 13.6 °C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS25944ARVCT and TPS259621RVCT, the TPS25944LRVCT uniquely combines UL 2367 latched fault behavior, DMODE-configurable supply priority, and 42 mΩ R_ON in a 3 mm × 4 mm WQFN - making it optimal for safety-isolated redundant power paths where manual reset assurance is mandatory.

Availability

TPS25944LRVCT is available at Aetrix Electronics and suitable for redundant power supply systems, PCIe/NIC hot-swap modules, and industrial PLCs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS25944LRVCT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The TPS2594x family targets high-density power-path management in space-constrained systems - designed specifically for hot-swap, redundancy, and fault-isolation applications across computing, storage, and industrial automation.

FAQ

What is the fault response behavior of the TPS25944LRVCT?

The TPS25944LRVCT implements a latched fault response: upon overcurrent, overvoltage, undervoltage, reverse voltage, or thermal shutdown, the internal FET turns off and FLT asserts low permanently until EN/UVLO is pulled to GND to reset the latch. This differs from auto-retry variants like TPS25944ARVCT and ensures fail-safe isolation without unintended re-engagement - critical for safety-compliant designs using TPS25944LRVCT.

How is the current limit set on the TPS25944LRVCT?

The TPS25944LRVCT current limit is set by an external resistor connected from the ILIM pin to GND. With R_ILIM = 16.9 kΩ, the device delivers 4.78–5.62 A (typical 5.2 A); values from 16.9 kΩ to 150 kΩ scale I_LIM from 0.6 A to 5.3 A (±8%). The TPS25944LRVCT datasheet provides a precise lookup table and formula - no calibration required due to factory-trimmed reference.

Does the TPS25944LRVCT support reverse current blocking?

Yes, the TPS25944LRVCT provides true reverse current blocking with a 1 µs response time and a V_IN–V_OUT threshold of –9.3 mV (typical). When V_IN falls below V_OUT minus this threshold, the internal back-to-back FETs disconnect the path, preventing backfeed - eliminating the need for external Schottky diodes or discrete MOSFETs in TPS25944LRVCT-based designs.

What package type and thermal characteristics does the TPS25944LRVCT use?

The TPS25944LRVCT uses a 20-pin WQFN package (RVC variant, 3.0 mm × 4.0 mm body, 0.5 mm pitch) with an exposed PowerPAD. Its thermal performance includes R_θJB = 13.6 °C/W (junction-to-board) and R_θJCbot = 3.4 °C/W (junction-to-case bottom), requiring connection of the PowerPAD to a PCB ground plane via ≥4 thermal vias for reliable operation at full 5 A load.

Can the TPS25944LRVCT be used in diode-mode applications?

Yes - the TPS25944LRVCT supports non-ideal diode mode via the DMODE pin (active-high). When DMODE is high, the device behaves as a smart diode with forward voltage drop proportional to load current and R_ON, enabling automatic supply priority selection between main and auxiliary rails. This function is confirmed in the TPS25944LRVCT datasheet Section 9.3.4 and Pin Function Table.