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LM2576

ACTIVE

SIMPLE SWITCHER® 40V, 3A Low Component Count Step-Down Regulator

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Data sheet

A newer version of this product is available

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LMQ66430 ACTIVE 36-V, 3-A low-EMI synchronous step-down converter with 1.5-µA IQ Integrated input bypass capacitor and boot cap for lower EMI and smaller footprint, dual-random spread spectrum and lower IQ.
TLVM13630 ACTIVE High-density, 3-V to 36-V input, 1-V to 6-V output, 3-A step-down power module Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM2576

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4 Vin (max) (V) 40 Switching frequency (min) (kHz) 42 Switching frequency (max) (kHz) 63 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 37 Iq (typ) (µA) 5000 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 3 Vin (min) (V) 4 Vin (max) (V) 40 Switching frequency (min) (kHz) 42 Switching frequency (max) (kHz) 63 Features Enable, Over Current Protection Control mode Voltage mode Vout (min) (V) 3.3 Vout (max) (V) 37 Iq (typ) (µA) 5000 Duty cycle (max) (%) 98
TO-220 (KC) 5 45.212 mm² 10.16 x 4.45 TO-220 (NDH) 5 86.0552 mm² 10.16 x 8.47 TO-220 (NEB) 5 46.4312 mm² 10.16 x 4.57 TO-263 (KTT) 5 154.8384 mm² 10.16 x 15.24

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM76003 requires very few external components and has a pinout designed for simple, optimum PCB layout for EMI and thermal performance. See the device comparison table to compare specs.

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use and include fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required.

A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

The LM76003 requires very few external components and has a pinout designed for simple, optimum PCB layout for EMI and thermal performance. See the device comparison table to compare specs.
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Technical documentation

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Type Title Date
* Data sheet LM2576xx Series SIMPLE SWITCHER Power Converter 3-A Step-Down Voltage Regulator datasheet (Rev. G) PDF | HTML 22 Mar 2023
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Application note Switching regulator fundamentals (Rev. C) PDF | HTML 05 Feb 2019
Technical article How to increase system reliability and simplify design using DC/DC converters PDF | HTML 13 Jun 2016
Technical article The importance of accurate switching frequency and current limit when selecting bu PDF | HTML 19 Apr 2016
Technical article Advantages of leaded packages in robust industrial designs PDF | HTML 08 Mar 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note AN-776 20-W SIMPLE SWITCHER Forward Converter (Rev. A) 23 Apr 2013
Application note High-Efficiency 3A Battery Chargers Use LM2576 Regulators (Rev. B) 23 Apr 2013
Application note Battery Charging 21 Mar 2007
Application note Buck Converters Provide a Battery Charger and System Power 21 Mar 2007
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

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

Evaluation board

LM2576S-ADJEVM — LM2576 Step-Down Converter Evaluation Module

The LM2576S-ADJEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM2576 step-down converter. The EVM operates from an 7V to 40V input and provides a 5V output at 3A.
User guide: PDF
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Support software

SWITCHERSMADESIMPLE-SW — Switchers Made Simple® Software

Note: The Switchers Made Simple design computations have been incorporated into Texas Instruments' award winning WEBENCH Power Designer Online Design Tool. Please use TI's WEBENCH Power Designer online tools for new designs. The WEBENCH Design Tool also includes:

  • Visual design optimization for (...)
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LM2574 — 8V to 40V, 500mA SIMPLE SWITCHER® buck converter with 4 external components LM2575 — 1-A Simple Step-Down Adjustable Voltage Switching Regulator with Output Enable LM2576 — SIMPLE SWITCHER® 40V, 3A Low Component Count Step-Down Regulator LM2577 — 3.5-V to 40-V, 3-A low component count step-up regulator
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Simulation model

LM2576 PSpice Transient Model

SNVMB28.ZIP (45 KB) - PSpice Model
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Simulation model

LM2576 Unencrypted PSpice Transient Model

SNVMB27.ZIP (2 KB) - PSpice Model
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Package Pins CAD symbols, footprints & 3D models
TO-220 (KC) 5 Ultra Librarian
TO-220 (NDH) 5 Ultra Librarian
TO-220 (NEB) 5 Ultra Librarian
TO-263 (KTT) 5 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • MTBF/FIT estimates
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Information included:
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  • Assembly location

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