TPS54140

ACTIVE

3.5V to 42V Input, 1.5A Step-Down Converter with Eco-Mode

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Product details

Parameters

Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 39 Iout (Max) (A) 1.5 Iq (Typ) (uA) 116 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Power Good, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 150 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 open-in-new Find other Buck converters (integrated switch)

Features

  • 3.5- to 42-V Input Voltage Range
  • 200-mΩ High-Side MOSFET
  • High Efficiency at Light Loads with a
    Pulse Skipping Eco-mode™
  • 116-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
  • MSOP10 Package With PowerPAD
  • Supported by WEBENCH® Software Tool
    (www.TI.com/WEBENCH)
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Description

The TPS54140 device is a 42-V, 1.5-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 116 µA. Using the enable pin, the shutdown supply current is reduced to 1.3 µA.

Undervoltage lockout is internally set at 2.5 V, but 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 the nominal voltage.

A wide switching frequency range allows efficiency and external component size to be optimized. Frequency foldback and thermal shutdown protects the device during an overload condition.

The TPS54140 device is available in a 10-pin thermally enhanced MSOP PowerPAD package.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR23615 ACTIVE SIMPLE SWITCHER®, 36-V, 1.5-A Synchronous Step-Down Converter 3.5-V to 42-V Input, 1.5-A step-down converter with Eco-Mode™.

Technical documentation

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Type Title Date
* Data sheet TPS54140 1.5-A, 42-V Step-Down DC-DC Converter With Eco-mode™ datasheet (Rev. C) Nov. 14, 2014
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
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
Technical article Power Tips: My personal IoT and how I would power my favorite Jun. 23, 2014
Application note Differences between the TPS54x40, TPS54x60 and the TPS54x40A, TPS54x60A Apr. 17, 2013
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) Oct. 26, 2012
Application note Level Shifting Control for an Inverting Buck-boost Oct. 10, 2012
User guide TPS54140EVM-429 1.5 A, SWIFT Regulator Evaluation Module Mar. 19, 2008

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The TPS54140EVM-429 evaluation module is designed to demonstrate the small printed-circuit-board areas that may be achieved when designing with the TPS54140 regulator. The TPS54140 dc/dc converter is designed to provide up to a 1.5 A output from an input voltage source of 3.5 V to 42 V. Rated input (...)

Design tools & simulation

SIMULATION MODEL Download
SLIM040A.ZIP (66 KB) - PSpice Model
SIMULATION MODEL Download
SLIM279.ZIP (68 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLIM280.TSC (380 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLVM545.ZIP (232 KB) - PSpice Model
SIMULATION MODEL Download
SLVM548.ZIP (7 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLVM549.TSC (623 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLVMCZ7.ZIP (8 KB) - PSpice Model
SIMULATION MODEL Download
SLVMD09.ZIP (1 KB) - PSpice Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
CALCULATION TOOL Download
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 (...)
CALCULATION TOOL Download
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 (...)

CALCULATION TOOL Download
SLVC432A.ZIP (49 KB)
BILL OF MATERIALS (BOM) Download
SLVR380.PDF (241 KB)

Reference designs

REFERENCE DESIGNS Download
Buck 5V@1A
PMP4746 — Automotive buck for 5V @1A w/ TPS54140 and input filter to attenuate reflected ripple to source
Design files
REFERENCE DESIGNS Download
Non Synchronous Buck Generating 5V @ 1A
PMP4504 — small non synchronous buck with TPS54140 for 5V output voltage at 1A load out of 20V to 28V at Fsw 1MHz
Design files
REFERENCE DESIGNS Download
Generates 1.8V, 2.5V, 3.3V, 5V @ 1A
PMP4503 — simple non synchronous buck with TPS54140 for various output voltages (1.8V, 2.5V, 3.3V, 5.0V) up to 1Amp load out of 16V to 36V
Design files
REFERENCE DESIGNS Download
Non-Synchronous Buck Converter using TPS54140, 3.3V @ 1.5A
PMP4642 — PMP4642 is a small, non-synchronous buck converter with 12-30V input voltage range. The output delivers 3.3V @ 1.5A.
Design files

CAD/CAE symbols

Package Pins Download
HVSSOP (DGQ) 10 View options

Ordering & quality

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  • Ongoing reliability monitoring

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