4.5-18V 20A SWIFT™ Synchronous Buck Converters with PMBus™ Programmability and Monitorin


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 20 Iq (Typ) (mA) 8 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Enable, I2C/PMBus, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable, Voltage Margining, Differential Remote Sense, Adaptive/Dynamic Voltage Scaling, Forced PWM, Soft Start Adjustable, Over Current Protection Operating temperature range (C) -40 to 85 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)


  • PMBus-Enabled Converters: 20 A, 30 A
  • 4.5-V to 18-V input, 0.6-V to 5.5-V Output
  • 5 mm × 7 mm LQFN Package with 0.5-mm Pitch
  • Single Thermal Pad
  • Integrated 4.5-mΩ and 2.0-mΩ Stacked NexFET™ Power Stage
  • 600-mV, 0.5% Reference
  • Lossless, Low-Side MOSFET Current Sensing
  • Selectable D-CAP™ and D-CAP2™ Mode Control
  • Differential Remote Sensing
  • Monotonic Start-Up into Pre-Biased Output
  • Output Voltage Margin and Trim
  • Output Voltage and Output Current Reporting
  • External Temperature Monitoring with 2N3904
  • Programmable via PMBus
    • Overcurrent Protection
    • UVLO, Soft-Start
    • PGOOD, OV, UV, OT Levels
    • Fault Responses
    • Turn-On and Turn-Off Delays
  • Thermal Shutdown
  • Pin Compatible 20-A, 30-A Converters

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The TPS544B20 and TPS544C20 devices are PMBus compatible, non-isolated DC-DC Integrated FET converters, capable of high-frequency operation and delivering 20-A , or 30-A current output from a 5 mm × 7 mm package, enabling high-power density and fast transient performance with minimal PCB area. The PMBus interface provides for converter configuration as well as monitoring of key parameters including output voltage, current and an optional external temperature. High-frequency, low-loss switching, provided by an integrated NexFET power stage and optimized drivers, allows for very high-density power solutions and reduced inductor and filter capacitor sizes. Response to fault conditions can be set to either restart or latch off depending on system requirements.

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Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet TPS544x20 4.5-V to 18-V, 20-A, and 30-A SWIFT Synchronous Buck Converters with PMBus datasheet (Rev. B) Apr. 29, 2016
Application notes DC/DC Converter Solutions for Hardware Accelerators in Data Center Applications Aug. 14, 2019
Application notes Programming the NVM of PMBus Buck Converters to Support Mass-Production Needs (Rev. B) May 13, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Non-isolated point-of-load solutions for VR13.HC in rack server & datacenter app Mar. 05, 2019
Application notes Practical Tips to Get Accurate Readouts Jun. 12, 2018
Application notes SMT Guidelines for Stacked Inductor (Inductor On Top) on Voltage Regulator IC Feb. 22, 2016
More literature TPS544B20 and TPS544C20 Quick Reference Guide Nov. 09, 2015
Technical articles Select the correct PMBus POL solution for your application Aug. 03, 2015
Technical articles Control your power device with PMBus™ Jun. 12, 2015
Technical articles How to tighten PMBus output current measurement accuracy Jun. 05, 2015
User guides Using the TPS544C20EVM-364, TPS544B20EVM-364, PWR-364 (Rev. A) Jun. 05, 2014
Application notes System telemetry: What, why and how? Apr. 11, 2014

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 TPS544B20EVM evaluation module (EVM) allows users to evaluate the TPS544B20. The TPS544B20 is a D-CAP2™ mode, 20-A SWIFTTM converter with PMBusTM. It provides a fixed 1.2-V output at up to 20 A from a 12-V input bus. The TPS544B20EVM is designed to demonstrate the TPS544B20 in a typical (...)



  • Full power conversion from 12V to 1V at 20A load.
  • Test points for all critical waveforms, PMBus connection
  • Convenient 3x3” size
  • Design files available for reuse


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 (...)
Linux Driver for PMBUS
PMBUSSW-LINUX The Linux driver supports PMBus controlled Buck Controllers. The Linux driver supports communication through the PMBus and interfaces with the HWMon framework.


Linux Mainline Status

Available in Linux Main line: Yes
Available through N/A

Supported Devices:

  • tps40400
  • tps40422
  • tps544b20
  • tps544b25
  • (...)

Design tools & simulation

SLUM540.ZIP (85 KB) - PSpice Model
SLVMBI2.ZIP (19 KB) - IBIS Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

Tiny 15A Digital Point-of-Load Reference Design Size Optimized for Design Reuse
PMP21064 — The PMP21064 reference design is designed using the TPS544B20 for a 15A point-of-load converter in a tiny 0.575"x0.85" solution size (14.6mmx21.6mm). TPS544B20 fully integrates a 20A buck regulator into a small 5mmx7mm QFN package. It features DCAP2 featuring fast dynamic response and is equipped (...)
document-generic Schematic document-generic User guide
12VDC Input, Hybrid Memory Cube (HMC) Gen. 2 Power Supply Reference Design
PMP20080 — The PMP20080 is a powerful design intended to operate 5 output rails with application to a Hybrid Memory Cube (HMC) Gen2. This design uses 5 synchronous bucks with multiple different controllers to allow for a well regulated set of outputs. Also, PMP20080 allows for the configurability that comes (...)
document-generic Schematic document-generic User guide
Xilinx Virtex® UltraScale™ FPGA Multi-Gigabit Transceiver (MGT) Power Solution
PMP10520 The PMP10520 reference design provides all the power supply rails (1V/20A, 1.2V/30A, 1.8V/4A) necessary to power the multi-gigabit transcievers (MGT) in Xilinx's Virtex® Ultrascale™  FPGAs.  This design uses a 5V input and has a PMBus interface for current and voltage monitoring (...)
document-generic Schematic document-generic User guide
Xilinx Virtex UltraScale FPGA Power Solution with PMBus Reference Design
PMP9475 The PMP9475 12V-input reference design provides all the power supply rails necessary to power Xilinx's Virtex® UltraScale™ family of FPGAs in  a compact, highly efficient design.  This design uses several of TI's PMBus Point-Of-Load voltage regulators for ease of (...)
document-generic Schematic document-generic User guide
Xilinx Virtex Ultrascale FPGA Multi-Gigabit Transceiver (MGT) Power Reference Design with PMBus
PMP9407 The PMP9407 reference design provides all the power supply rails necessary to power the multi-gigabit transcievers (MGT) in Xilinx's Virtex® Ultrascale™ FPGAs.  This design uses a 5V input and has a PMBus interface for current and voltage monitoring, margining, timing delays, and (...)
document-generic Schematic document-generic User guide
Xilinx(r) Ultrascale(r) 16nm FPGA/SoC Power Solution for Mobile Radio Basestation with PMBus
PMP10555 The PMP10555 reference design provides all the power supply rails necessary to power Xilinx® Ultrascale® 16nm family of FPGAs/SoCs in a mobile radio basestation application.   This design uses a PMBus compatible 20A integrated FET buck converter for the core and two multi-output buck (...)
document-generic Schematic document-generic User guide
1V @ 30A Integrated FET with PMBus Reference Design
PMP9008 PMP9008 is designed using the TPS544C20 to generate low voltage point of load outputs up to 30A. The design is a very compact form factor sync buck with integrated FETs. The controller also offers PMBus comands for telemetry and monitoring. The efficieny is over 85% for almost the entire load range (...)

CAD/CAE symbols

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