Texas Instruments TPS544C25RVFR

Overview

TPS544C25RVFR from Texas Instruments is a PMBus™-compliant 30-A synchronous buck converter in a 5 mm × 7 mm LQFN-40 package, operating from 4.5 V to 18 V input and delivering 0.5 V to 5.5 V output with 0.5% reference accuracy at ≥600 mV. It integrates 5.5-mΩ high-side and 2.0-mΩ low-side NexFET™ power stages, supports 200–1000 kHz programmable switching frequency, and enables adaptive voltage scaling (AVS) via PMBus for server and networking power rails.

For engineers reviewing the TPS544C25RVFR datasheet, TPS544C25RVFR pinout, TPS544C25RVFR application, or TPS544C25RVFR equivalent, key selection criteria include its 30-A continuous output rating, differential remote sensing capability, lossless low-side current sensing, thermal shutdown at 135–155°C, and PMBus-configurable overcurrent/overvoltage fault thresholds - all critical for high-density, digitally controlled point-of-load designs.

Technical Context

The TPS544C25RVFR implements voltage-mode control with input feed-forward for fast transient response and monotonic start-up into pre-biased outputs. Its integrated power stage eliminates external MOSFETs and drivers, while the PMBus interface provides real-time readback of output voltage (±2.0% accuracy), output current (±15% above 20 A), and external temperature (±5°C).

It features dual on-board regulators (BP3: 3.2 V @ 5 mA; BP6: 6.4 V @ 10 mA), programmable soft-start (0–100 ms), soft-stop (0–100 ms), and configurable fault responses (restart/latch-off/ignore). The device supports frequency synchronization to an external clock and uses lossless current sensing via the low-side FET's R_DS(on), eliminating sense resistors.

Key Specifications

Pinout & Package

TPS544C25RVFR is housed in a thermally enhanced 40-pin LQFN package (5.0 mm × 7.0 mm) with exposed thermal pad soldered to PCB ground for optimal heat dissipation. The package supports high-current routing via multiple VIN, SW, GND, and PGND pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with TPS544C25RVFR, the TPS544B25RVFR offers identical digital control in a lower-current variant, while the ISL9122AIRTZ-T7A trades PMBus depth and sensing precision for size and simplicity - making TPS544C25RVFR the sole choice for 30-A, telemetry-rich, thermally demanding infrastructure applications.

Availability

TPS544C25RVFR is available at Aetrix Electronics and suitable for server motherboard development, enterprise SSD power delivery, and high-density optical transport equipment requiring stable component supply, long-term lifecycle assurance, and full PMBus interoperability.

Supply support for TPS544C25RVFR 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 expertise in high-efficiency DC-DC conversion.

The TPS544x25 product line was designed specifically for digitally managed, high-current point-of-load applications in data center, networking, and telecom infrastructure - emphasizing PMBus configurability, thermal resilience, and integration density.

FAQ

What is the maximum continuous output current of the TPS544C25RVFR?

The TPS544C25RVFR delivers 30 A continuous output current under recommended operating conditions (T_J ≤ 125°C, proper PCB thermal design). This rating is validated with the integrated 5.5-mΩ high-side and 2.0-mΩ low-side NexFET™ power stage, and assumes adequate heatsinking via the exposed thermal pad. Derating applies above 85°C ambient.

Does the TPS544C25RVFR support differential remote voltage sensing?

Yes, the TPS544C25RVFR supports differential remote sensing via dedicated VOUTS+ (Pin 31) and VOUTS− (Pin 32) pins. This function feeds both the internal voltage control loop and PMBus telemetry, enabling precise regulation at the load point and compensating for PCB trace resistance - critical for sub-1 V, high-current rails.

Can the TPS544C25RVFR be synchronized to an external clock?

Yes, the TPS544C25RVFR supports frequency synchronization via the SYNC/RESET_B pin (Pin 39). It accepts external clock signals from 200 kHz to 1200 kHz, with ±20% tolerance relative to its free-running frequency. Synchronization eliminates beat frequencies in multi-converter systems and simplifies EMI filtering.

What is the accuracy of output voltage reporting via PMBus on the TPS544C25RVFR?

The TPS544C25RVFR provides output voltage measurement accuracy of ±2.0% across its 0.5 V to 5.8 V range, with 1.953 mV LSB resolution. This telemetry is derived from the DIFFO amplifier output and is accessible via the READ_VOUT command, enabling closed-loop system monitoring without external ADCs.

How does the TPS544C25RVFR handle overcurrent protection?

The TPS544C25RVFR implements dual overcurrent protection: low-side current limit (factory default 36 A, programmable 5–40 A) and high-side short-circuit detection (40–75 A peak). Both features include thermal compensation and configurable fault responses (restart/latch-off/ignore), reported via PMBus STATUS_WORD and FAULT_LOG registers.