Texas Instruments TPS25944ARVCR

Overview

TPS25944ARVCR 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 TPS25944ARVCR datasheet, TPS25944ARVCR pinout, TPS25944ARVCR application, or TPS25944ARVCR equivalent, key selection criteria include its auto-retry circuit breaker mode, ±2% OVP/UVLO thresholds, 1-µs reverse voltage shutoff, UL 2367 recognition, and WQFN-20 (3.0 mm × 4.0 mm) thermal-pad package for high-density industrial and computing power path designs.

Technical Context

The TPS25944ARVCR implements a dual-FET power mux architecture with non-ideal diode mode (enabled via DMODE pin), enabling source priority arbitration between main and auxiliary rails. Its fault response is defined by a fixed 4 ms timeout before internal FET turnoff - distinct from the TPS25942's current-limiting + thermal shutdown behavior.

Protection functions are fully programmable: ILIM sets overcurrent threshold via external resistor (16.9 kΩ–150 kΩ), dVdT controls output ramp rate via capacitor, PGTH configures power-good window, while EN/UVLO and OVP pins set lockout and overvoltage trip points with ±2% accuracy across –40°C to +125°C.

Key Specifications

Pinout & Package

TPS25944ARVCR uses a 20-pin WQFN package (RVC) with 3.0 mm × 4.0 mm body and exposed thermal pad requiring multi-via grounding for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS25942ARVCR and TPS25944LRCR, the TPS25944ARVCR uniquely balances rapid fault containment (4 ms) with autonomous recovery (128 ms retry), making it optimal for telecom and computing systems needing high availability without manual intervention.

Availability

TPS25944ARVCR is available at Aetrix Electronics and suitable for redundant power supplies, PCIe hot-swap modules, and USB-C power banks requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.

Supply support for TPS25944ARVCR 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 over 90 years of innovation in industrial, automotive, and computing applications.

The TPS25944x family is designed specifically for high-reliability power path management in systems demanding programmable protection, bidirectional control, and safety certification - targeting data center, networking, and industrial automation equipment.

FAQ

What protection features does the TPS25944ARVCR provide?

The TPS25944ARVCR provides overvoltage (±2% threshold), undervoltage lockout, programmable overcurrent (0.6 A–5.3 A), reverse current blocking with 1-µs shutoff, dV/dt-controlled output ramp, and thermal shutdown. Its 4 ms fault timer triggers internal FET turnoff on sustained overcurrent, distinguishing it from current-limiting eFuses like the TPS25942 series.

How is current limit configured on the TPS25944ARVCR?

Current limit on the TPS25944ARVCR is set using an external resistor (R_ILIM) from the ILIM pin to GND. Values from 16.9 kΩ to 150 kΩ yield 4.78 A to 0.53 A limits, respectively, with ±8% accuracy across temperature. The TPS25944ARVCR does not clamp current but initiates its 4 ms fault timer when load current exceeds the programmed threshold.

What is the function of the DMODE pin on the TPS25944ARVCR?

The DMODE pin on the TPS25944ARVCR is an active-high input that enables non-ideal diode mode, allowing the device to arbitrate between main and auxiliary power sources based on voltage priority. When DMODE is high, the TPS25944ARVCR behaves as a smart OR-ing controller, blocking reverse current while permitting forward conduction only from the higher-voltage rail.

Does the TPS25944ARVCR support reverse current blocking?

Yes, the TPS25944ARVCR provides true reverse current blocking with 1-µs response time when V_IN falls below (V_OUT – 10 mV). This feature eliminates backfeed in dual-supply systems without requiring external Schottky diodes, and is enabled by internal comparator monitoring of the V_IN–V_OUT differential.

What package type and thermal requirements apply to the TPS25944ARVCR?

The TPS25944ARVCR uses a 20-pin WQFN (RVC) package measuring 3.0 mm × 4.0 mm with an exposed thermal pad. For reliable operation above 2.5 W, the pad must be connected to a PCB ground plane using ≥4 thermal vias. Junction-to-board thermal resistance is 13.6°C/W, enabling operation up to +125°C ambient with proper layout.