3.5V to 42V Input, 2.5A Step-Down Converter with Eco-Mode


Product details


Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 39 Iout (Max) (A) 2.5 Iq (Typ) (uA) 138 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HVSSOP (DGQ) 10 9 mm² 3 x 3 VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • 3.5-V to 42-V Input Voltage Range
  • 200-mΩ High-Side MOSFET
  • High Efficiency at Light Loads With a
    Pulse Skipping Eco-Mode™
  • 138-µA Operating Quiescent Current
  • 1.3-µA Shutdown Current
  • 100-kHz to 2.5-MHz Switching Frequency
  • Synchronizes to External Clock
  • Adjustable Slow Start and Sequencing
  • UV and OV Power Good Output
  • Adjustable UVLO Voltage and Hysteresis
  • 0.8-V Internal Voltage Reference
  • 10-Pin HVSSOP and 10-Pin 3-mm x 3-mm
    VSON Packages with PowerPAD™
  • Supported by WEBENCH® Software Tool
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The TPS54240 device is a 42-V, 2.5-A, step-down regulator with an integrated high-side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low-ripple, pulse skip mode reduces the no load, regulated output supply current to 138 µA. Using the enable pin, shutdown supply current is reduced to 1.3 µA, when the enable pin is low.

Undervoltage lockout is internally set at 2.5 V, but it can be increased using the enable pin. The output voltage startup ramp is controlled by the slow-start pin that can also be configured for sequencing and tracking. An open-drain power good signal indicates the output is within 94% to 107% of its nominal voltage.

A wide switching frequency range allows efficiency and optimization of external component size. Frequency foldback and thermal shutdown protects the part during an overload condition.

The TPS54240 is available in 10-pin, thermally-enhanced HVSSOP and 10-pin 3-mm × 3-mm PowerPAD package.

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Similar products you might be interested in
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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR23625 ACTIVE SIMPLE SWITCHER®, 36V 2.5A Synchronous Step-Down Converter 3.5-V to 42-V Input, 2.5-A step-down converter with Eco-Mode™.

Technical documentation

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Type Title Date
* Data sheet TPS54240 3.5-V to 42-V Step-Down DC - DC Converter With Eco-Mode™ datasheet (Rev. B) Nov. 24, 2014
Technical article 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
User guide TPS54240EVM-VSON Regulator Evaluation Module Feb. 26, 2018
Application note Understanding Eco-mode(TM) Operation Dec. 05, 2016
Application note Design Considerations for DC-DC Converters in Fast-Input Slew Rate Applications Mar. 05, 2015
Application note Methods to Improve Low Dropout Operation with the TPS54240 and TPS54260 (Rev. A) Nov. 06, 2013
Application note Creating a Universal Car Charger for USB Devices From the TPS54240 and TPS2511 (Rev. E) Sep. 16, 2013
Technical article Power Tips: how to build a car charger Sep. 03, 2013
Application note Level Shifting Control for an Inverting Buck-boost Oct. 10, 2012
User guide TPS54240EVM-605 2.5-A, SWIFT™ Regulator Evaluation Module Mar. 09, 2010

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 TPS54240 dc/dc converter is designed to provide up to a 2.5-A output from an input voltage source of 3.5V to 40V. Rated input voltage and output current range for the evaluation module are given in Table 1 of the User Guide. This evaluation module is designed to demonstrate the small (...)
document-generic User guide
TPS54240EVM-VSON is a step-down converter evaluation module (EVM).  The TPS54240 is a buck converter with Eco-mode control which can provide high efficiency at light loads. It has a wide switching-frequency range allows efficiency and external component size to be optimized.
  • 3.5-V to 42-V input voltage
  • 3.3-V output at 2.5 A
  • Eco-mode™ control mode for high efficiency at light loads
  • 1200-kHz operating frequency
  • Current mode control

Design tools & simulation

SLIM265A.ZIP (53 KB) - PSpice Model
SLVM271.TSC (160 KB) - TINA-TI Reference Design
SLVM272.ZIP (51 KB) - TINA-TI Spice Model
SLVMD00.ZIP (7 KB) - PSpice 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
  • (...)
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 (...)

SLVC432A.ZIP (49 KB)

Reference designs

12Vdc Input, 2.1A USB Charger for Smart Phones and Tablets Reference Design
PMP7371 This reference design takes a 12Vdc input (20V max) and generates a 5V/2.1A output for charging smart phone and tablets. The TPS54240 provides a cost effective yet efficient solution for the DC/DC conversion. The TPS2561A provides a precision current limit to protect the device being charged during (...)
document-generic Schematic document-generic User guide
3.8V @ 2.5A Buck Converter
PMP8537 — This design is a buck converter for automotive as well as for non-automotive applications. It delivers an output voltage of 3.8V @ 2.5A at an input voltage range of 9-14V. It can withstand input peaks up to 40V.
9-40V Automotive Input, 5V@2.1A Smart USB Charger Reference Design
PMP7388 This reference design is a complete automotive USB charger solution from the car battery.
From a 9V to 40V DC input,  this design generates a 5V/2.1A output for smart phones and tablets.
document-generic Schematic document-generic User guide
Design files

CAD/CAE symbols

Package Pins Download
HVSSOP (DGQ) 10 View options
VSON (DRC) 10 View options

Ordering & quality

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