Texas Instruments TPS549D22RVFT

Overview

TPS549D22 from Texas Instruments is a 40-A synchronous step-down DC/DC converter with integrated 2.9-mΩ high-side and 1.2-mΩ low-side NexFET™ MOSFETs, D-CAP3™ adaptive on-time control, full differential remote sensing, and PMBus™ 1-MHz digital interface. It operates from 1.5-V to 16-V PVIN and 4.5-V to 22-V VDD, delivering 0.6-V to 5.5-V output for high-density point-of-load applications in enterprise servers and telecom infrastructure.

For engineers reviewing the TPS549D22 datasheet, TPS549D22 pinout, TPS549D22 application, or TPS549D22 equivalent, key selection considerations include its 40-A continuous output capability, ±0.5% reference accuracy over –40°C to +125°C, programmable switching frequencies (315–1125 kHz), differential voltage sense architecture, and PMBus-configurable fault responses including hiccup vs latch-off OVP/UVP.

Technical Context

The TPS549D22 implements D-CAP3™ control with emulated current-mode feedback, enabling stable operation with all-ceramic output capacitors and eliminating external compensation components. Its adaptive on-time architecture dynamically adjusts t_ON (min 60 ns) and t_OFF (min 300 ns) to maintain preset frequency across wide VIN/VOUT ranges while optimizing transient response.

Digital functionality is implemented via dedicated PMB_CLK and PMB_DATA pins supporting 1-MHz PMBus with PEC, plus SMB_ALRT# for fault reporting. The device integrates a true differential remote sense amplifier (5-MHz UGBW, ±4.7 V/µs slew rate) and supports on-the-fly VOUT_COMMAND, VOUT_MARGIN, and NVM-backed configuration storage.

Key Specifications

Pinout & Package

The TPS549D22 is housed in a 7-mm × 5-mm, 40-pin LQFN-CLIP (RVF) package with exposed thermal pad for enhanced power dissipation. Thermal metrics include R_θJC(bot) = 0.6°C/W and R_θJB = 3.6°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS549D22, TPS548D22RVFT offers identical power stage and thermal performance but removes PMBus telemetry-reducing system complexity at the cost of configurability. ISL9123IRAJZ-T7A trades integration and current capability for smaller footprint and lower input voltage support, requiring external FETs and increasing design effort.

Availability

TPS549D22 is available at Aetrix Electronics and suitable for enterprise server, telecom infrastructure, and industrial automation applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS549D22 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for high-reliability applications.

The TPS549D22 belongs to TI's SWIFT™ family of high-current DC/DC converters designed for demanding point-of-load applications in datacenter, networking, and industrial systems where efficiency, density, and digital control are critical.

FAQ

What is the maximum continuous output current supported by the TPS549D22?

The TPS549D22 supports 40-A continuous output current using its integrated 2.9-mΩ high-side and 1.2-mΩ low-side NexFET™ MOSFETs. This rating is validated under natural convection with proper PCB copper area and thermal vias per TI's SLUUBG4 EVM layout. Derating applies above 60°C ambient or with reduced airflow.

Does the TPS549D22 require external compensation components?

No, the TPS549D22 does not require external compensation components. Its D-CAP3™ control architecture uses emulated current information and adaptive on-time modulation, enabling stable operation with all-ceramic output capacitors and eliminating the need for external RC networks typically required in voltage-mode or current-mode controllers.

How is output voltage programmed on the TPS549D22 without feedback resistors?

The TPS549D22 uses the VSEL pin to set initial startup voltage from 0.6 V to 1.2 V in 50-mV increments via resistor strapping. Once enabled, VOUT is fully programmable via PMBus VOUT_COMMAND command, allowing dynamic adjustment from 0.6 V to 5.5 V without hardware changes - the TPS549D22 retains this setting in NVM if configured.

What thermal performance can be expected from the TPS549D22 in a typical 4-layer PCB layout?

In a standard 4-layer PCB with 2 oz copper, 10 thermal vias under the exposed pad, and 200 LFM airflow, the TPS549D22 achieves ≤65°C junction rise at 40-A load and 12-V input. Its R_θJB = 3.6°C/W and R_θJC(bot) = 0.6°C/W enable efficient heat transfer to the board, with thermal shutdown activating at 155°C to protect against sustained overload.

Can the TPS549D22 operate with a 1.5-V input voltage?

Yes, the TPS549D22 supports PVIN down to 1.5 V, enabling direct regulation from low-voltage intermediate buses. However, VDD must remain within 4.5 V to 22 V - so a separate bias supply (e.g., 5-V rail) is required when PVIN < 4.5 V. The internal BP LDO provides 5.07-V gate drive from VDD, ensuring robust FET switching even at minimum PVIN.