Texas Instruments TPS544C26RXXR

Overview

TPS544C26RXXR from Texas Instruments is a 4-V to 16-V input, 35-A synchronous buck converter with integrated 4.0-mΩ high-side and 1.0-mΩ low-side MOSFETs, Intel VR13 SVID compliance, and dual I²C/SVID interfaces for telemetry and configuration. It delivers ±0.5% output voltage accuracy (0°C–85°C) and supports DDR5 RAPL input power monitoring in server CPU core rail applications.

For engineers reviewing the TPS544C26RXXR datasheet, TPS544C26RXXR pinout, TPS544C26RXXR application, or TPS544C26RXXR equivalent, key selection considerations include SVID protocol support, programmable D-CAP+ loop compensation, 0.6–1.2 MHz selectable switching frequency, differential remote sensing, and catastrophic fault reporting via CAT_FAULT#.

Technical Context

The TPS544C26RXXR implements D-CAP+™ control topology with cycle-by-cycle valley current limiting and programmable soft-start/soft-stop timing (1–16 ms / 0.5–4 ms). Its dual-interface architecture enables simultaneous SVID command execution and I²C-based NVM configuration of VOUT, telemetry thresholds, and protection settings.

It integrates input power sensing (VINSENP/VINSENM), precision differential remote sense (VOSNS/GOSNS), and a 5 mm × 6 mm, 37-pin WQFN-FCRLF package with dedicated thermal pad and multiple PGND/SW pins for high-current routing. The device supports external 5-V bias on VCC/VDRV to extend minimum input to 2.7 V and reduce LDO losses.

Key Specifications

Pinout & Package

The TPS544C26RXXR uses a 5 mm × 6 mm, 37-pin WQFN-FCRLF package with exposed thermal pad (RXX suffix). Pin layout supports high-current SW routing (8 parallel pins), distributed PGND (5 pins), and noise-sensitive analog sensing (VINSENP/VINSENM/VOSNS/GOSNS) with dedicated AGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS544C26RXXR, the TPS546C23RXXR offers higher current capacity but omits SVID and RAPL functionality essential for Intel server platforms, while the ISL91302BRHJZ-T7A reduces footprint and cost at the expense of single-phase simplicity, telemetry depth, and ±0.5% accuracy assurance.

Availability

TPS544C26RXXR is available at Aetrix Electronics and suitable for server CPU core rails, AI accelerator power supplies, and DDR5 memory subsystems requiring stable component supply, long-term lifecycle support, and full SVID protocol compliance.

Supply support for TPS544C26RXXR 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 and server power architecture.

The TPS544C26RXXR belongs to TI's SVID-compliant high-current buck converter product line, designed specifically for Intel VR13-compliant server and SoC platforms requiring integrated telemetry, fast transient response, and DDR5 RAPL support.

FAQ

What is the minimum input voltage supported by the TPS544C26RXXR?

The TPS544C26RXXR supports a minimum input voltage of 2.7 V when an external 5-V bias is applied to the VCC/VDRV pin, enabling operation with partially discharged backup supplies or low-voltage intermediate bus architectures. Without external bias, the minimum PVIN is 4.0 V. This dual-input capability is confirmed in Section 6.3 Recommended Operating Conditions of the SLVSFW7 datasheet.

Does the TPS544C26RXXR support differential remote sensing?

Yes, the TPS544C26RXXR supports precision differential remote sensing using VOSNS and GOSNS pins, achieving ±0.5% output voltage accuracy from 0°C to 85°C TJ. This feature compensates for IR drop across PCB traces and ensures tight regulation at the load point, critical for high-current CPU core rails. The specification is verified in Section 6.5 Electrical Characteristics (VOUT(ACC) rows).

How does the TPS544C26RXXR implement input power telemetry for DDR5 RAPL?

The TPS544C26RXXR implements DDR5 RAPL input power telemetry via dedicated VINSENP and VINSENM pins, which measure voltage across an external sense resistor to calculate real-time input current. This data feeds board-level power management firmware for memory power capping. The function is documented in Section 1 Features and Section 6.5 Electrical Characteristics (VINSENP/VINSENM parameter rows).

What protection features are available on the TPS544C26RXXR?

The TPS544C26RXXR provides programmable overcurrent (valley and negative), overvoltage, undervoltage, and overtemperature protections, plus a dedicated open-drain CAT_FAULT# output that asserts low on catastrophic faults. All protections are configurable via I²C or SVID registers and reported in real time. Details appear in Section 1 Features and Section 6.5 Electrical Characteristics (OVERCURRENT LIMIT, UVLO, etc.).

Can the TPS544C26RXXR be used without SVID communication?

Yes, the TPS544C26RXXR can operate without SVID communication by configuring output voltage and operating parameters via its I²C interface and storing them in NVM. Once programmed, it functions autonomously with default settings, making it suitable for non-Intel platforms or legacy host controllers lacking SVID support. This dual-interface flexibility is explicitly stated in Section 3 Description and Section 7.5 Programming.