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LMR33620 ACTIVE SIMPLE SWITCHER® 3.8V to 36V, 2A Synchronous Buck Converter With Ultra-Low EMI Smaller footprint, higher efficiency, lower IQ and lower EMI.

Product details

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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
HVSSOP (DGQ) 10 9 mm² 3 x 3
  • 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)
  • 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)

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.

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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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) PDF | HTML 14 Nov 2014
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Application note Understanding Eco-mode(TM) Operation 05 Dec 2016
Application note Design Considerations for DC-DC Converters in Fast-Input Slew Rate Applications 05 Mar 2015
Technical article Power Tips: My personal IoT and how I would power my favorite 23 Jun 2014
Application note Differences between the TPS54x40, TPS54x60 and the TPS54x40A, TPS54x60A 17 Apr 2013
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) 26 Oct 2012
Application note Level Shifting Control for an Inverting Buck-boost 10 Oct 2012
User guide TPS54140EVM-429 1.5 A, SWIFT Regulator Evaluation Module 19 Mar 2008

Design & development

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

Evaluation board

TPS54140EVM-429 — TPS54140 42V Input, 3.3V Output, 1.5A Evaluation Module

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 (...)
User guide: PDF
Not available on TI.com
Simulation model

TPS54140 PSpice Average Model

SLVM545.ZIP (232 KB) - PSpice Model
Simulation model

TPS54140 PSpice Transient Model (Rev. A)

SLIM040A.ZIP (66 KB) - PSpice Model
Simulation model

TPS54140 TINA-TI Average Reference Design

SLVM549.TSC (623 KB) - TINA-TI Reference Design
Simulation model

TPS54140 TINA-TI Average Spice Model

SLVM548.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

TPS54140 TINA-TI Steady State Reference Design

SLIM280.TSC (380 KB) - TINA-TI Reference Design
Simulation model

TPS54140 TINA-TI Transient Spice Model

SLIM279.ZIP (68 KB) - TINA-TI Spice Model
Simulation model

TPS54140 Unencrypted PSpice Average Model

SLVMD09.ZIP (1 KB) - PSpice Model
Simulation model

TPS54140 Unencrypted PSpice Transient Model

SLVMCZ7.ZIP (8 KB) - PSpice Model
Bill of materials (BOM)

Spartan 6 OMAPReference Design

SLVR380.PDF (241 KB)
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 (...)
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 (...)

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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