4.5-V to 18-V, 30-A synchronous SWIFT™ buck converter with PMBus programmability and monitoring


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 30 Iq (Typ) (uA) 8000 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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TPS544B20 ACTIVE 4.5-V to 18-V, 20-A synchronous SWIFT™ buck converter with PMBus programmability and monitoring This product is a pin-to-pin version with 20-A output current and an available evaluation module.
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TPS546D24A ACTIVE 2.95-V to 16-V, stackable 40-A synchronous SWIFT™ buck converter with pin-strapping and PMBus Upgraded 40-A PMBus converter product offering higher efficiency and more output current.

Technical documentation

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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
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
Application note Programming the NVM of PMBus Buck Converters to Support Mass-Production Needs (Rev. B) May 13, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Practical Tips to Get Accurate Readouts Jun. 12, 2018
Technical article Getting started with PMBus Sep. 14, 2017
Application note 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 article Select the correct PMBus POL solution for your application Aug. 03, 2015
Application note Not All Jitter Is Created Equal (Rev. A) Jul. 04, 2015
Technical article Control your power device with PMBus™ Jun. 12, 2015
User guide Using the TPS544C20EVM-364, TPS544B20EVM-364, PWR-364 (Rev. A) Jun. 05, 2014
Application note D-CAP(TM) Mode With All-Ceramic Output Capacitor Application Feb. 03, 2011

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-634 is designed to help the user easily evaluate and test the operation and functionality of the TPS544B20 buck converter. The EVM converts a 4.5-V to 18-V input voltage to a regulated 1.0-V output voltage that delivers up to 20 A in a 5-mm x7-mm QFN package. The output voltage on (...)

  • D-CAP™ control mode for fast transient response and low external component count
  • 0.5%, 600-mV reference voltage enables tight output voltage regulation accuracy
  • Output voltage margining and fault reporting via PMBus

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 (...)
PMBus Software Library for MSP MCUs
MSP-PMBUS The MSP Power Management Bus (PMBus) embedded software library is a free C library for enabling PMBus master implementation on MSP microcontrollers that have eUSCI/USCI serial communication peripherals. In addition, the library supports alert response (for host notification in the presence of (...)
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

SLUM420A.ZIP (83 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

12V Vin, 1V 30A POL With PMBus Interface and RCC Ripple-Current Injection Reference Design
PMP4499 — PMP4499 is a reference design that uses the TPS544C20 to generate low-voltage point-of-load (POL) outputs up to 30 A. The design is sync-buck topology with integrated FETs to provide high efficiency. The controller also offers PMBus commands for telemetry and monitoring. The design is (...)
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
High Density 30W DC-DC PMBus Buck Converter with Inductor Mounted Over the Converter to Save Space
PMP10364 This design has inductor over converter to achieve 30 A conversion in 1" by 0.6" (2.5 cm by 1.5 cm) footprint. The DCAP control of the controller provides a high speed control loop which is needed for applications with large rapidly varying loads, such as microprocessors. A high speed dynamic load (...)
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

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

Ordering & quality

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