Texas Instruments TPS546C23ZRVFT

Overview

TPS546C23ZRVFT from Texas Instruments is a PMBus 1.3–compliant, 35-A synchronous buck converter with integrated NexFET™ power stage, supporting 4.5 V to 18 V input and 0.35 V to 5.5 V programmable output voltage. It delivers high-density power in a 7-mm × 5-mm LQFN-40 package, features lossless current sensing, differential remote sensing, and monotonic start-up into pre-biased loads-enabling precise regulation in server VR13/VR14 and enterprise SSD applications.

For engineers reviewing the TPS546C23ZRVFT datasheet, TPS546C23ZRVFT pinout, TPS546C23ZRVFT application, or TPS546C23ZRVFT equivalent, key selection considerations include its stackable 2-device architecture for 70-A operation, ±0.5% reference accuracy at ≥600 mV, 200 kHz–1 MHz programmable switching frequency via RT resistor, PMBus telemetry (VOUT, IOUT, die temperature), and thermal shutdown at 135°C–160°C.

Technical Context

The TPS546C23ZRVFT implements voltage-mode control with input feed-forward for fast transient response and stable loop behavior across wide VIN and VOUT ranges. Its dual-regulator architecture supplies 3.3 V (BP3) for controller logic and 6.5 V (BP6) for gate drivers, both internally regulated and bypassed to dedicated ground planes (AGND/PGND).

Current sharing between stacked devices is achieved via ISHARE and VSHARE pins with ±15% accuracy above 20 A per device; synchronization supports interleaved 2-phase operation using SYNC-IN/SYNC-OUT with 515-ns timing delay and 160 kHz–1.2 MHz external clock compatibility.

Key Specifications

Pinout & Package

TPS546C23ZRVFT uses a 40-pin LQFN (RVF) package measuring 7.0 mm × 5.0 mm with exposed thermal pad connected internally to PGND. Thermal pad solder coverage is mandatory for thermal performance and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current, PMBus-enabled buck converter applications.

Compared with TPS546B21RTVR and ISL91211AIRZ-T7A, the TPS546C23ZRVFT uniquely combines 35-A integrated power delivery, native 2-device stacking, and full PMBus 1.3 telemetry in a single 40-pin LQFN-making it optimal for VR13/VR14-compliant server and storage platforms demanding scalability and observability.

Availability

TPS546C23ZRVFT is available at Aetrix Electronics and suitable for server CPU core power, enterprise SSD power, and Ethernet switch fabric applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for TPS546C23ZRVFT 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 and digital power control.

The TPS546C23ZRVFT belongs to TI's high-current, PMBus-compliant buck converter product line, designed specifically for next-generation server, storage, and networking equipment requiring scalable, observable, and thermally robust power delivery.

FAQ

What is the maximum output current capability of the TPS546C23ZRVFT?

The TPS546C23ZRVFT delivers 35 A continuously from a single device. When two TPS546C23ZRVFT units are stacked in parallel with ISHARE/VSHARE interconnection, the combined output reaches 70 A with ±15% current-sharing accuracy above 20 A per device. This stacking is fully supported by the IC's built-in PMBus commands and hardware signaling-no external current-sharing IC is required.

Does the TPS546C23ZRVFT support adaptive voltage scaling (AVS)?

Yes, the TPS546C23ZRVFT supports AVS through its PMBus VOUT_COMMAND register and programmable reference range of 350 mV to 1650 mV. It achieves ±0.5% reference accuracy at 600 mV and above, enabling precise dynamic voltage control for CPU/GPU cores. Margining functions (up/down) are also accessible via PMBus for production testing and field calibration.

How is thermal management handled in the TPS546C23ZRVFT?

The TPS546C23ZRVFT integrates a die temperature sensor reporting via PMBus (MTSNS register), with ±5°C accuracy from –40°C to +165°C. It features programmable thermal warning (100–140°C) and fault (120–165°C) thresholds, plus fixed thermal shutdown at 135–160°C with 25°C hysteresis. The exposed thermal pad must be soldered to a large copper pour for effective heat dissipation-RθJB is 3.8°C/W.

Can the TPS546C23ZRVFT operate with a pre-biased output?

Yes, the TPS546C23ZRVFT supports monotonic start-up into pre-biased outputs-a critical feature for hot-swap and multi-rail sequencing in servers and storage. Its control architecture prevents reverse current flow during startup by disabling the high-side FET until the feedback voltage rises above the programmed threshold, ensuring safe ramp-up even when VOUT is initially non-zero.

What are the key differences between the TPS546C23ZRVFT and the TPS546B21RTVR?

The TPS546C23ZRVFT offers 35-A output (vs. 30-A), native 2-device stacking via ISHARE/VSHARE pins (absent in TPS546B21RTVR), and a 40-pin LQFN package (vs. 32-pin). Both share PMBus 1.3 compliance and 4.5–18 V input, but only the TPS546C23ZRVFT supports full 70-A scalable operation and differential remote sensing with dedicated DIFFO pin functionality.