LM2576

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 4 Vin (Max) (V) 40 Vout (Min) (V) 3.3 Vout (Max) (V) 37 Iout (Max) (A) 3 Iq (Typ) (mA) 5 Iq (Typ) (uA) 5000 Switching frequency (Min) (kHz) 42 Switching frequency (Max) (kHz) 63 Features Enable, Over Current Protection Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

TO-220 (KC) 5 86 mm² 10.2 x 8.7 TO-220 (NDH) 5 86 mm² 10.16 x 8.47 TO-263 (KTT) 5 155 mm² 10.16 x 15.24 open-in-new Find other Buck converters (integrated switch)

Features

  • New product available: LMR33630 36-V, 3-A, 400-kHz synchronous converter
  • 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions
  • Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions
  • Specified 3-A output current
  • Wide input voltage range: 40 V Up to 60 V for HV version
  • Requires only four external components
  • 52-kHz Fixed-frequency internal oscillator
  • TTL-shutdown capability, low-power standby mode
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current limit protection
  • Create a Custom Design with WEBENCH Tools

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Description

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 new product, LMR33630, offers reduced BOM cost, higher efficiency, and an 85% reduction in solution size among many other features. See the Device Comparison Table to compare specs. Start a WEBENCH Design with LMR33630.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR33630 ACTIVE SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI Next-generation 3.8-V to 36-V, 3-A synchronous buck converter with ultra-low EMI.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 24
Type Title Date
* Datasheet LM2576xx Series SIMPLE SWITCHER 3-A Step-Down Voltage Regulator datasheet (Rev. E) Mar. 30, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Switching regulator fundamentals (Rev. C) Feb. 05, 2019
Technical articles How to increase system reliability and simplify design using DC/DC converters Jun. 13, 2016
Technical articles The importance of accurate switching frequency and current limit when selecting buck regulators Apr. 19, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles Advantages of leaded packages in robust industrial designs Mar. 08, 2016
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes AN-776 20-W SIMPLE SWITCHER Forward Converter (Rev. A) Apr. 23, 2013
Application notes High-Efficiency 3A Battery Chargers Use LM2576 Regulators (Rev. B) Apr. 23, 2013
Application notes Battery Charging Mar. 21, 2007
Application notes Buck Converters Provide a Battery Charger and System Power Mar. 21, 2007
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
29
Description
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.
Features
  • Simple High Efficiency Step-Down Regulator
  • Adjustable Output Voltage
  • TTL-Shutdown Capability
  • Input Operating Range As High As 40V

Design tools & simulation

SIMULATION MODELS Download
SNVMB27.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMB28.ZIP (45 KB) - PSpice Model
SIMULATION TOOLS 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
  • (...)
DESIGN TOOLS Download
Switchers Made Simple
SWITCHERSMADESIMPLE-SW 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 (...)

CAD/CAE symbols

Package Pins Download
(NEB) 5 View options
DDPAK/TO-263 (KTT) 5 View options
TO-220 (KC) 5 View options
TO-220 (NDH) 5 View options

Ordering & quality

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