Texas Instruments TPS544C20RVFT

Overview

TPS544C20RVFT from Texas Instruments is a PMBus-enabled, 30-A synchronous buck converter with integrated NexFET™ power stage, operating from 4.5 V to 18 V input and delivering 0.6 V to 5.5 V output. It features 4.5-mΩ high-side and 2.0-mΩ low-side MOSFETs, 500 kHz default switching frequency (programmable via RT resistor), and 0.5% reference accuracy at 600 mV. Used in high-density server and enterprise storage power rails.

For engineers reviewing the TPS544C20RVFT datasheet, TPS544C20RVFT pinout, TPS544C20RVFT application, or TPS544C20RVFT equivalent, key selection considerations include its 30-A continuous output capability, LQFN-40 thermal-pad package, D-CAP2™/D-CAP™ mode control flexibility, lossless current sensing, and full PMBus programmability for voltage margining, fault response, and real-time telemetry.

Technical Context

The TPS544C20RVFT implements a dual-mode control architecture supporting both D-CAP2™ (for fast transient response with no external compensation) and D-CAP™ (for improved light-load efficiency), selected via the MODE pin. Its integrated stacked power stage enables high-frequency operation up to 1 MHz while maintaining low conduction losses.

It delivers precise regulation via differential remote sensing (VOUTS+/VOUTS–), supports monotonic start-up into pre-biased outputs, and provides real-time reporting of output voltage, current, and optional external temperature via PMBus. Fault protection includes programmable overcurrent (39 A default), overvoltage (700 mV FB threshold), undervoltage (499 mV), and thermal shutdown (135–155 °C).

Key Specifications

Pinout & Package

TPS544C20RVFT is housed in a 5 mm × 7 mm LQFN-40 package with exposed thermal pad (RVFT suffix). The package uses 0.5-mm pitch, single-row perimeter pins plus central thermal tab soldered to PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS544B20RVFT, the TPS544C20RVFT delivers 50% higher continuous current and lower R_DS(on), enabling smaller thermal solution size; versus MP2960GQKT-Z, it offers superior transient response via D-CAP2™ and tighter reference accuracy, at the cost of TI-specific toolchain dependency.

Availability

TPS544C20RVFT is available at Aetrix Electronics and suitable for server motherboard design, enterprise SSD power delivery, and optical transport equipment requiring stable component supply and long-term lifecycle support.

Supply support for TPS544C20RVFT 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-efficiency DC-DC conversion.

The TPS544x20 product line was designed specifically for high-density, digitally managed POL applications in datacenter, networking, and storage systems demanding precision, telemetry, and robust fault handling.

FAQ

What is the maximum continuous output current rating for the TPS544C20RVFT?

The TPS544C20RVFT is rated for 30 A continuous output current under recommended operating conditions (T_J ≤ 125°C, proper PCB thermal design). This rating is validated per TI's SOA curves and thermal metrics, including R_θJCbot = 0.9 °C/W. Derating applies above 85°C ambient or with reduced airflow; full 30-A operation requires ≥400 LFM airflow or equivalent heatsinking. The TPS544C20RVFT maintains regulation and protection integrity across this range.

Does the TPS544C20RVFT support both D-CAP™ and D-CAP2™ control modes?

Yes, the TPS544C20RVFT supports both D-CAP™ and D-CAP2™ modes via the MODE pin: connect MODE to AGND for D-CAP™ (optimized for light-load efficiency), or to BP3 for D-CAP2™ (enhanced transient response with built-in feed-forward). Both modes operate without external compensation components. The TPS544C20RVFT's internal circuitry automatically adapts loop dynamics, and mode selection is confirmed by reading the MODE register (0x00) via PMBus. No hardware change is needed beyond the MODE pin strap.

How is output voltage accuracy maintained across temperature and load for the TPS544C20RVFT?

The TPS544C20RVFT achieves ±0.5% feedback reference accuracy (600 mV ±3 mV) from –40°C to +125°C, verified in production test. Differential remote sensing (VOUTS+/VOUTS–) compensates for PCB trace resistance, and the error amplifier's 130 µS transconductance ensures stable loop gain. Load regulation is <±0.1% from 0–30 A at 12 V input, and line regulation is <±0.05% over 4.5–18 V input. These specs are guaranteed in the TPS544C20RVFT electrical characteristics table (Section 7.5).

Can the TPS544C20RVFT be used without PMBus communication?

Yes, the TPS544C20RVFT operates fully autonomously without PMBus: default settings (500 kHz f_SW, 39 A OCP, 0.6 V reference) are active at power-up. Pins CLK, DATA, ADDR0, and ADDR1 can be left unconnected or pulled to appropriate states for fixed-address operation. All protections (UVLO, OVP, UVP, OTP) remain functional. PMBus is optional for advanced configuration-TPS544C20RVFT does not require host firmware interaction to regulate correctly.

What thermal management guidance applies to the TPS544C20RVFT's exposed thermal pad?

The TPS544C20RVFT's thermal pad must be soldered to a solid copper GND plane with ≥8 thermal vias (0.3 mm diameter, filled or capped) connecting to inner/ground layers. TI specifies R_θJB = 4.0 °C/W and R_θJCbot = 0.9 °C/W-achievable only with ≥200 mm² pad area and ≥50% solder coverage. Avoid splitting the pad or routing signals underneath. The TPS544C20RVFT thermal tab connects internally to PGND; improper grounding causes thermal runaway or PGOOD false trips.