Texas Instruments TPS25944LRVCR

Overview

TPS25944LRVCR 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 outputs, and IMON current monitoring - deployed in redundant power supplies and PCIe/NIC hot-swap systems.

For engineers reviewing the TPS25944LRVCR datasheet, TPS25944LRVCR pinout, TPS25944LRVCR application, or TPS25944LRVCR equivalent, key selection criteria include its latched fault response mode, ±2% OVP/UVLO thresholds, 1-µs reverse voltage shutoff, UL 2367 recognition (File No. 169910), and WQFN-20 (3.0 mm × 4.0 mm) package compatibility with thermal pad grounding.

Technical Context

The TPS25944LRVCR implements a dual-FET power path architecture enabling bidirectional current control and true reverse blocking (V_IN < V_OUT – 10 mV). Its fault handling is defined by a 4 ms timer-based circuit breaker (not current limiting), with latched shutdown behavior triggered by overvoltage, undervoltage, reverse voltage, or thermal events.

Programmability spans multiple protection domains: ILIM via external resistor (16.9 kΩ–150 kΩ), dV/dt ramp rate via capacitor on dVdT pin, PGTH threshold for power-good assertion, and DMODE pin activation of non-ideal diode mode. All thresholds exhibit ±2% accuracy across –40°C to +125°C.

Key Specifications

Pinout & Package

TPS25944LRVCR uses a 20-pin WQFN package (3.0 mm × 4.0 mm body, 0.5 mm pitch) with exposed thermal PowerPAD™ requiring PCB ground plane connection via multiple vias for 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 TPS25944ARVCR, the TPS25944LRVCR provides deterministic latched shutdown for fail-safe operation, while TPS25944LRVCR outperforms TPS259621RVCR in 12 V precision power muxing with tighter OVP/UVLO accuracy, faster reverse blocking, and UL-certified reliability.

Availability

TPS25944LRVCR is available at Aetrix Electronics and suitable for redundant power supply systems, PCIe/NIC hot-swap modules, and industrial PLC power management requiring stable component supply, long-term lifecycle support, and UL-certified safety compliance.

Supply support for TPS25944LRVCR 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 ICs, with decades of expertise in high-reliability power protection solutions.

The TPS2594x family was designed specifically for high-density power path management in computing, storage, and industrial systems - delivering integrated eFuse functionality with programmable protection, thermal robustness, and safety certifications.

FAQ

What is the fault response behavior of the TPS25944LRVCR?

The TPS25944LRVCR implements a latched circuit breaker fault response: upon overcurrent, overvoltage, undervoltage, reverse voltage, or thermal event, it asserts FLT low and shuts off the internal FET permanently until EN/UVLO is pulled low to reset the latch. This differs from auto-retry versions (e.g., TPS25944ARVCR) and ensures no uncontrolled re-engagement during persistent faults - a requirement in safety-critical TPS25944LRVCR deployments.

How does the TPS25944LRVCR achieve reverse current blocking?

The TPS25944LRVCR achieves true reverse current blocking by continuously monitoring V_IN – V_OUT; when this differential falls below –9.3 mV (typical), the device disables the internal FET within 1 µs. This eliminates backfeed from output to input without external diodes - critical in dual-supply systems like redundant 12 V rails where TPS25944LRVCR prevents cross-conduction during source switchover.

What is the purpose of the DMODE pin on the TPS25944LRVCR?

The DMODE pin on the TPS25944LRVCR enables non-ideal diode mode, allowing dynamic assignment of MAIN/AUX supply priority in redundant systems. When DMODE is high, the device uses FLT status to determine which source is active and blocks reverse current accordingly. This function is essential for automatic failover in TPS25944LRVCR-based power mux designs used in NICs and RAID controllers.

Can the TPS25944LRVCR be used in USB-C power delivery applications?

The TPS25944LRVCR supports USB-C power bank and adapter applications per its datasheet Applications section, but it is not a USB-C PD controller. It serves as a robust 5-A eFuse on the VBUS path, providing overcurrent, overvoltage, and reverse blocking protection. For full USB-C PD compliance (e.g., CC logic, SOP messaging), a dedicated PD controller must be paired with the TPS25944LRVCR - which handles only the analog power path protection layer.

What thermal design considerations apply to the TPS25944LRVCR?

The TPS25944LRVCR requires proper thermal management via its exposed PowerPAD™: it must be soldered to a PCB ground plane with ≥4 thermal vias to achieve R_θJB = 13.6°C/W. At 5 A and 42 mΩ R_ON, power dissipation reaches ~1.05 W; without adequate copper area and vias, junction temperature may exceed 125°C. Thermal shutdown triggers at 160°C with 12°C hysteresis - a safeguard confirmed in TPS25944LRVCR characterization data.