LM2673

ACTIVE

8V to 40V, 3A SIMPLE SWITCHER® buck converter with adjustable current limit

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Product details

Parameters

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Package | Pins | Size

TO-220 (NDZ) 7 83 mm² 10.16 x 8.13 TO-263 (KTW) 7 154 mm² 10.1 x 15.24 VSON (NHM) 14 30 mm² 6 x 5 open-in-new Find other Buck converters (integrated switch)

Features

  • Efficiency Up to 94%
  • Simple and Easy to Design With (Using Off-The-
    Shelf External Components)
  • Resistor Programmable Peak Current Limit Over a
    Range of 2 A to 5 A
  • 150-mΩ DMOS Output Switch
  • 3.3-V, 5-V, 12-V Fixed Output and Adjustable
    (1.2 V to 37 V) Versions
  • ±2% Maximum Output Tolerance Over Full Line
    and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-KHz Fixed Frequency Internal Oscillator
  • Soft-Start Capability
  • –40 to 125°C Operating Junction Temperature
    Range
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Description

The LM2673 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2673 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power on by adding a soft-start timing capacitor to gradually turn on the regulator. The LM2673 series also has built-in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

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Technical documentation

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Type Title Date
* Data sheet LM2673 SIMPLE SWITCHER® 3-A Step-Down Voltage Regulator With Adjustable Current Limit datasheet (Rev. O) Jun. 30, 2016
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical article DC/DC converter datasheets - Calculate system losses May 02, 2016
Technical article DC/DC converter datasheets – System losses demystified Apr. 25, 2016
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical article DC/DC converter datasheets – System efficiency demystified Apr. 18, 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application note AN-1187 Leadless Leadframe Package (LLP) (Rev. R) May 07, 2013
User guide AN-1135 LM267X 3A, 5A Evaluation Boards (Rev. D) Apr. 24, 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application note Simple Techniques Minimize Cross-Coupling in Distributed Power Systems Mar. 21, 2007
Application note Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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Hardware development

EVALUATION BOARD Download
document-generic User guide
25
Description

Simple Switcher 3A Step-Down Voltage Regulatory with Adjustable Current Limit

Features
  • Efficiency up to 94%
  • Simple and easy to design with (using off-the -shelf external components)
  • Resistor programmable peak current limit over a range of 2A to 5A
  • 150 m ohm DMOS output switch
  • 3.3V, 5V and 12V fixed output and adjustable (1.2V to 37V) versions
  • +/-2% maximum output tolerance over full line (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM486B.ZIP (215 KB) - PSpice Model
SIMULATION MODEL Download
SNVM512A.ZIP (13 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVM513A.TSC (99 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM514A.TSC (139 KB) - TINA-TI Reference Design
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
  • (...)

CAD/CAE symbols

Package Pins Download
DDPAK/TO-263 (KTW) 7 View options
TO-220 (NDZ) 7 View options
VSON (NHM) 14 View options

Ordering & quality

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