TPS54140A

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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, 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)

Features

  • 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™
  • Tighter Enable Threshold than TPS54140 for
    More Accurate UVLO Voltage
  • Adjustable UVLO Voltage and Hysteresis
  • 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/Sequencing
  • UV and OV Power Good Output
  • 0.8-V Internal Voltage Reference
  • MSOP10 and 3-mm × 3-mm VSON-10 Package
    With PowerPAD™
  • Supported by WEBENCH® and SwitcherPro™
    Software Tool
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Description

The TPS54140A 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, 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/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 external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition.

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Technical documentation

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Type Title Date
* Data sheet TPS54140A 1.5-A, 42-V Step-Down DC/DC Converter with Eco-mode™ datasheet (Rev. C) Oct. 28, 2015
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
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 Differences between the TPS54x40, TPS54x60 and the TPS54x40A, TPS54x60A Apr. 17, 2013
Application note Level Shifting Control for an Inverting Buck-boost Oct. 10, 2012

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
SLVC432A.ZIP (49 KB)

Reference designs

REFERENCE DESIGNS Download
Three-phase inverter reference design for 200-480 VAC drives with opto-emulated input gate drivers
TIDA-010025 — This reference design realizes a reinforced isolated three-phase inverter subsystem using isolated IGBT gate drivers and isolated current/voltage sensors. The UCC23513 gate driver used has a 6-pin wide body package with optical LED emulated inputs which enables its use as pin-to-pin replacement to (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non-Isolated Buck Using TPS54140A with Input 24 to 30 VDC 5V@1.25A Reference Design
PMP8716 The PMP8716 (5V@1.25A) reference design is a 7W DC/DC Buck which uses a TPS54140A. It can generate a Non-Isolated 5 volt output at 1.25 Amps from an input a 24 to 30 Volts DC. This design has multiple outputs.
Design files

CAD/CAE symbols

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

Ordering & quality

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  • Ongoing reliability monitoring

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