2.95-V to 16-V input, stackable 40-A, SWIFT™ synchronous buck converter with pin-strapping/PMBus®


Product details


Vin (Min) (V) 2.95 Vin (Max) (V) 16 Vout (Min) (V) 0.25 Vout (Max) (V) 5.5 Iout (Max) (A) 40 Iq (Typ) (mA) 9 Switching frequency (Min) (kHz) 225 Switching frequency (Max) (kHz) 1500 Features Adaptive/Dynamic Voltage Scaling, Adjustable Current Limit, Differential Remote Sense, Enable, Forced PWM, Frequency Synchronization, Over Current Protection, I2C/PMBus, Phase Interleaving, Power Good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO Adjustable, Voltage Margining Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

LQFN-CLIP (RVF) 40 35 mm² 7 x 5 open-in-new Find other Buck converters (integrated switch)


  • Split rail support: 2.95-V to 16-V PVIN;
    2.95-V to 18-V AVIN (4-VIN VDD5 for switching)
  • Integrated 4.5-mΩ/0.9-mΩ MOSFETs
  • Average current mode control with selectable internal compensation
  • 2×, 3x, 4× stackable with current sharing up to 160 A, supporting a single address per output
  • Selectable 0.6-V to 5.5-V output via pin strap or 0.25-V to 6.0-V using PMBus VOUT_COMMAND
  • Extensive PMBus command set with telemetry for VOUT, IOUT and internal die temperature
  • Differential remote sensing with internal FB divider for < 1% VOUT error –40°C to +150°C TJ
  • AVS and margining capabilities through PMBus
  • MSEL pins pin programming PMBus defaults
  • 12 Selectable switching frequencies from 225 kHz to 1.5 MHz (8 pin-strap options)
  • Frequency sync in/sync out
  • Supports prebiased output
  • Supports strongly coupled inductor
  • 7 mm × 5 mm × 1.5 mm, 40-pin QFN,
    Pitch = 0.5 mm
  • Create a Custom Design Using the TPS546D24A With WEBENCH® Power Designer

All trademarks are the property of their respective owners.

open-in-new Find other Buck converters (integrated switch)


The TPS546D24A is a highly integrated, non-isolated DC/DC converter capable of high frequency operation and 40-A current output from a 7-mm × 5-mm package. Two, three, and four TPS546D24A devices can be interconnected to provide up to 160 A on a single output. The device has an option to overdrive the internal 5-V LDO with an external 5-V supply via the VDD5 pin to improve efficiency and reduce power dissipation of the converter.

The TPS546D24A uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability over a wide range of output capacitances.

The PMBus interface with 1-MHz clock support gives a convenient, standardized digital interface for converter configuration as well as monitoring of key parameters including output voltage, output current, and internal die temperature. Response to fault conditions can be set to restart, latch off, or ignore, depending on system requirements. Back-channel communication between stacked devices enables all TPS546D24A converters powering a single output rail to share a single address to simplify system software/firmware design. Key parameters including output voltage, switching frequency, soft-start time, and overcurrent fault limits can also be configured through BOM selection without PMBus communication to support program free power-up.

open-in-new Find other Buck converters (integrated switch)

Technical documentation

= Featured
No results found. Please clear your search and try again. View all 15
Type Title Date
* Datasheet TPS546D24A 2.95-V to 16-V, 40-A, up to 4x Stackable, PMBus Buck Converter datasheet Feb. 13, 2019
Application notes Collection of DC/DC Buck Regulator Technical Documentation Jun. 12, 2020
Technical articles 3 big benefits of small cells May 26, 2020
Application notes Minimize On-Time-Jitter and Ripple by Optimizing Compensation May 11, 2020
Technical articles Advantages of scalability: from Peter Parker to pin-strapping Apr. 30, 2020
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Technical articles SoC power design: 3 steps to a thermally optimized power supply Mar. 08, 2020
Application notes Powering the TPS546D24A Device Family From a Single 3.3-V Input Power Supply (Rev. A) Mar. 04, 2020
Technical articles 35 years later, APEC continues to set the tone for innovation in power management Feb. 27, 2020
White papers Power solution options for data center applications (Rev. A) Feb. 27, 2020
Application notes Achieving Better than 1% Output Voltage Accuracy with TPS546D24A Dec. 01, 2019
Application notes DC/DC Converter Solutions for Hardware Accelerators in Data Center Applications Aug. 14, 2019
User guides Stacking TPS546D24A Two-Phase Evaluation Module Jul. 30, 2019
White papers Small Cells, Big Impact: Designing Power Soutions for 5G Applications Jun. 26, 2019
Application notes Non-isolated point-of-load solutions for VR13.HC in rack server & datacenter app Mar. 05, 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The TPS546D24AEVM-2PH evaluation module (EVM) is a two-phase buck converter with two TPS546D24A devices. The TPS546D24A device is a stackable synchronous buck with PMBus interface that can operate from a nominal 2.95-V to 16-V supply. The device allows programming and monitoring via the PMBus (...)
  • 2x stacked devices with current sharing
  • Selectable internal compensation
  • PMBus programmable switching frequency from 225 kHz to 1.5 MHz
  • PMBus telemetry for VOUT, IOUT and internal die temperature
  • Adaptive voltage scaling (AVS) and margining
  • Remote differential remote sensing with internal FB divider for (...)

Software development

Digital Power Software
FUSION_DIGITAL_POWER_DESIGNER Fusion Digital Power™  is the Graphical User Interface (GUI) used to configure and monitor select Texas Instruments digital power controllers and sequencer/health monitors. The application uses the PMBus protocol to communicate with the device over serial bus by way of a TI USB adapter.

Some of the tasks you can perform with the GUI include:

  • Turn on or off the power supply output, either through the hardware control line or the PMBus OPERATION command
  • Monitor real-time data. Items such as input voltage, output voltage, output current, temperature, and warnings/faults are continuously (...)

Design tools & simulation

SLUM704.ZIP (98 KB) - IBIS Model
SLUM705.ZIP (69 KB) - PSpice Model
SLUM707.ZIP (257 KB) - PSpice Model
SLUM708.ZIP (189 KB) - PSpice Model
SLUM725.ZIP (1791 KB) - SIMPLIS Model
SLUC686A.ZIP (165 KB)

Reference designs

4-Phase, 160-A synchronous buck converter reference design for communications processor power
PMP21814 — This reference design uses four TPS546D24A converters with integrated MOSFETs to support a full load of 160A at a 0.9V output. The system operates at a switching frequency of 650 kHz and has a PMBus interface that can be used to configure key converter parameters, including internal compensation (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
LQFN-CLIP (RVF) 40 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Related videos