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Buck converters (integrated switch)

TPS54331

ACTIVE

3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

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Data sheet
3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode

TPS54331

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 3.5 Vin (Max) (V) 28 Vout (Min) (V) 0.8 Vout (Max) (V) 25 Iout (Max) (A) 3 Iq (Typ) (uA) 110 Switching frequency (Min) (kHz) 570 Switching frequency (Max) (kHz) 570 Features Enable, Light Load Efficiency, UVLO Adjustable, Soft Start Adjustable Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 3.5 Vin (Max) (V) 28 Vout (Min) (V) 0.8 Vout (Max) (V) 25 Iout (Max) (A) 3 Iq (Typ) (uA) 110 Switching frequency (Min) (kHz) 570 Switching frequency (Max) (kHz) 570 Features Enable, Light Load Efficiency, UVLO Adjustable, Soft Start Adjustable Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1
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HSOIC (DDA) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 4.9 x 3.9 SOIC (D) 8 19 mm² 3.91 x 4.9
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  • 3.5 to 28-V Input Voltage Range
  • Adjustable Output Voltage Down to 0.8 V
  • Integrated 80-mΩ High-Side MOSFET Supports up to 3-A Continuous Output Current
  • High Efficiency at Light Loads With a Pulse Skipping Eco-mode™
  • Fixed 570 kHz Switching Frequency
  • Typical 1-µA Shutdown Quiescent Current
  • Adjustable Slow-Start Limits Inrush Currents
  • Programmable UVLO Threshold
  • Overvoltage Transient Protection
  • Cycle-by-Cycle Current Limit, Frequency Fold Back, and Thermal Shutdown Protection
  • Available in Easy-to-Use SOIC8 Package or Thermally Enhanced SOIC8 PowerPAD™ Package
  • Create a Custom Design with WEBENCH Tools
  • 3.5 to 28-V Input Voltage Range
  • Adjustable Output Voltage Down to 0.8 V
  • Integrated 80-mΩ High-Side MOSFET Supports up to 3-A Continuous Output Current
  • High Efficiency at Light Loads With a Pulse Skipping Eco-mode™
  • Fixed 570 kHz Switching Frequency
  • Typical 1-µA Shutdown Quiescent Current
  • Adjustable Slow-Start Limits Inrush Currents
  • Programmable UVLO Threshold
  • Overvoltage Transient Protection
  • Cycle-by-Cycle Current Limit, Frequency Fold Back, and Thermal Shutdown Protection
  • Available in Easy-to-Use SOIC8 Package or Thermally Enhanced SOIC8 PowerPAD™ Package
  • Create a Custom Design with WEBENCH Tools
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The TPS54331 device is a 28-V, 3-A non-synchronous buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode feature is automatically activated. Furthermore, the 1-µA shutdown supply-current allows the device to be used in battery-powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current-limit scheme, frequency foldback and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO PowerPAD package that have been internally optimized to improve thermal performance.

The TPS54331 device is a 28-V, 3-A non-synchronous buck converter that integrates a low RDS(on) high-side MOSFET. To increase efficiency at light loads, a pulse skipping Eco-mode feature is automatically activated. Furthermore, the 1-µA shutdown supply-current allows the device to be used in battery-powered applications. Current mode control with internal slope compensation simplifies the external compensation calculations and reduces component count while allowing the use of ceramic output capacitors. A resistor divider programs the hysteresis of the input undervoltage lockout. An overvoltage transient protection circuit limits voltage overshoots during startup and transient conditions. A cycle-by-cycle current-limit scheme, frequency foldback and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54331 device is available in an 8-pin SOIC package and 8-pin SO PowerPAD package that have been internally optimized to improve thermal performance.

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Technical documentation

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Type Title Date
* Data sheet TPS54331 3-A, 28-V Input, Step Down DC-DC Converter With Eco-mode™ datasheet (Rev. F) 24 Oct 2014
Application note Low Dropout Operation in a Buck Converter (Rev. A) 01 Apr 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Understanding Eco-mode(TM) Operation 05 Dec 2016
Technical article How-to Improve Buck Converter Light Load Efficiency with an LDO - Part 2 02 Sep 2014
Application note Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co 11 Jul 2014
Application note Simple CC/CV Charger using TPS54331 30 Nov 2012
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) 26 Oct 2012
Application note Designing Type III Compensation for Current Mode Step-Down Converters (Rev. A) 15 Sep 2010
Application note Efficiency of synchronous versus nonsynchronous buck converters 04 Oct 2009
User guide TPS54331EVM-232 3-A, SWIFT™ Regulator Evaluation Module 11 Jul 2008
Application note Understanding and Applying Current-Mode Control Theory 19 Aug 2007
Application note Modeling, Analysis and Compensation of the Current-Mode Converter 05 Sep 1999

Design & development

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

Evaluation board

TPS54331EVM-232 — TPS54331 28V Input, 3.3V Output, 3A Evaluation Module

The TPS54331EVM-232 is a fully assembled and tested circuit for evaluating the TPS54331 synchronous step-down SWIFT™ converter. The EVM converts a 3.5-V to 28-V input voltage to a regulated 3.3-V output voltage that delivers up to 3-A output. The switching frequency is internally set at a (...)

document-pdfAcrobat User guide
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Simulation model

TPS54331 TINA-TI Transient Reference Design (Rev. A)

SLIM041A.TSC (390 KB) - TINA-TI Reference Design
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Simulation model

TPS54331 TINA-TI Transient Spice Model (Rev. A)

SLIM042A.TSM (14 KB) - TINA-TI Spice Model
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Simulation model

TPS54331 Unencrypted PSpice Transient Model Package (Rev. A)

SLVM659A.ZIP (55 KB) - PSpice Model
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Simulation model

TPS54331 TINA-TI Average Reference Design

SLVMC20.TSC (580 KB) - TINA-TI Reference Design
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Simulation model

TPS54331 TINA-TI Average Spice Model

SLVMC21.ZIP (8 KB) - TINA-TI Spice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Calculation tool

SWIFTINV-CALC — Inverting Power Supply Calculator for SWIFT DC/DC with Integrated FETs

The SWIFTINV-CALC Excel sheet is a complementary worksheet to the SLVA317 application note. The worksheet is used to calculate the external components needed to create a negative output voltage from a positive input voltage. The tool features several families of wide input voltage, current-mode (...)
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Calculation tool

SWIFTPOSNEG-CALC — Positive and Negative Output Voltage Split Rail Calculator for SWIFT DC/DC Converters

The SWIFTPosNeg-CALC Excel sheet is a complementary worksheet to the SLVA369 application note.

This worksheet is used to calculate the external components needed to create a dual output (i.e. positive and negative) power supply using a step-down switching regulator and catalog off the shelf coupled (...)

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Reference designs

TIDA-010055 — Non-isolated power architecture with diagnostics reference design for protection relay modules

This reference design showcases non-isolated power supply architectures for protection relays with analog input/output and communication modules generated from 5-, 12-, or 24-V DC input. To generate the power supplies the design uses DC/DC converters with an integrated FET, a power module with an (...)
document-generic Schematic
Reference designs

TIDA-01243 — USB Type-C™ and Power Delivery Minidock With Video and Charging Support Reference Design

The USB Type-C® and power delivery (PD) minidock reference design provides a reference for a USB Type-C dock including audio, USB data, power and video.  This reference design has a small 2-inch by 4-inch form factor and supports both source and sink power capabilities over the primary (...)
document-pdfAcrobat Schematic
Reference designs

TIDA-00393 — Adding an LDO for Increased Standby Mode Efficiency Reference Design

This regulation topology is designed to increase the efficiency of a DC/DC buck converter by disabling the converter during light-load operation and providing a regulated output voltage with a low-Iq LDO. During no-load or light-load conditions, the LDO allows for low-noise, low-Iq output voltage (...)
document-pdfAcrobat Schematic
Package Pins Download
SO PowerPAD (DDA) 8 View options
SOIC (D) 8 View options

Ordering & quality

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