3.5 to 28V Input, 2A, 570kHz Step-Down Converter with Eco-mode™


Product details


Vin (Min) (V) 3.5 Vin (Max) (V) 28 Vout (Min) (V) 0.8 Vout (Max) (V) 25 Iout (Max) (A) 2 Iq (Typ) (uA) 75 Switching frequency (Min) (kHz) 570 Switching frequency (Max) (kHz) 570 Features Enable, Light Load Efficiency, UVLO Adjustable, Soft Start Adjustable, Over Current Protection Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other Buck converters (integrated switch)


  • 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 2 A Continuous Output
  • High Efficiency at Light Loads with a
    Pulse Skipping Eco-mode™
  • Fixed 570-kHz Switching Frequency
  • Typical 1-µA Shutdown Quiescent
  • Adjustable Slow-Start Limits Inrush
  • 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
  • Supported by WEBENCH® Software Tool
    • Consumer Applications such as Set-Top Boxes,
      CPE Equipment, LCD Displays, Peripherals, and
      Battery Chargers
    • Industrial and Car Audio Power Supplies
    • 5-V, 12-V and 24-V Distributed Power Systems

WEBENCH Is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners

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The TPS54231 device is a 2-V, 2-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 fold back and thermal shutdown protect the device and the load in the event of an overload condition. The TPS54231 device is available in an 8-pin SOIC package that has been internally optimized to improve thermal performance.

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Technical documentation

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Type Title Date
* Datasheet TPS54231 2-A, 28-V Input, Step-Down DC-DC Converter With Eco-mode™ datasheet (Rev. D) Oct. 24, 2014
Application note Low Dropout Operation in a Buck Converter (Rev. A) Apr. 01, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note 800VA Pure Sine Wave Inverter's Reference Design (Rev. A) Aug. 01, 2017
Application note Using TPS54335A to Create an Inverting Power Supply (Rev. A) Jul. 19, 2017
Application note Understanding Eco-mode(TM) Operation Dec. 05, 2016
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) Oct. 26, 2012
Application note Designing Type III Compensation for Current Mode Step-Down Converters (Rev. A) Sep. 15, 2010
User guide TPS54231EVM-372 2-A, SWIFT™ Regulator Evaluation Module Oct. 08, 2008

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 TPS54231EVM-372 is a fully assembled and tested circuit for evaluating the TPS54231 synchronous step-down SWIFT™ converter. The EVM converts a 7-V to 28-V input voltage to a regulated 3.3-V output voltage that delivers up to 2 A. The switching frequency is internally set at a nominal 570 (...)

  • 7-V to 28-V input voltage range
  • 92.7% efficiency (VIN = 7 V, IO = 0.5 A)
  • High efficiency at light loads with pulse-skipping eco-mode
  • Fixed 570-kHz switching frequency
  • Integrated 80-mΩ high-side MOSFET supports up to 2-A continuous output current

Design tools & simulation

SLUM255A.ZIP (40 KB) - PSpice Model
SLUM342.ZIP (18 KB) - TINA-TI Spice Model
SLUM343.TSC (152 KB) - TINA-TI Reference Design
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
  • (...)
Inverting Power Supply Calculator for SWIFT DC/DC with Integrated FETs
SWIFTINV-CALC 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 (...)
Positive and Negative Output Voltage Split Rail Calculator for SWIFT DC/DC Converters
SWIFTPOSNEG-CALC 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 (...)

Reference designs

Non-isolated power architecture with diagnostics reference design for protection relay modules
TIDA-010055 — 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 document-generic User guide
Offline 25W power supply (12V @ 100mA)
PMP5554 — The PMP5554 is a reference design for a 25W offline power supply. It can operate from an universal input voltage range (85VAC to 265VAC). It's a flyback topology with 3 output voltages.
Design files
Reference Design using TMS320C6657 to Implement Efficient OPUS Codec Solution
TIDEP0036 The TIDEP0036 reference design provides an example of the ease of running TI optimized Opus encoder/decoder on the TMS320C6657 device. Since Opus supports a a wide range of bit rates, frame sizes and sampling rates, all with low delay, it has applicability for voice communications, networked audio (...)
document-generic Schematic document-generic User guide
Low Cost Inverting Buck-Boost Provides -5.2V@500mA from 12Vin for Test Equip Apps Reference Design
PMP9161 This inverting buck-boost converter implements a low cost integrated FET buck controller to generate a negative output voltage. The converter is designed with very low ripple voltage, low cost and small area in mind.
Design files

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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