LM2596

ACTIVE

SIMPLE SWITCHER® 4.5V to 40V, 3A Low Component Count Step-Down Regulator

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 40 Vout (Min) (V) 3.3 Vout (Max) (V) 37 Iout (Max) (A) 3 Iq (Typ) (mA) 5 Switching frequency (Min) (kHz) 110 Switching frequency (Max) (kHz) 173 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 (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, and adjustable output versions
  • Adjustable version output voltage range: 1.2-V to 37-V ±4% maximum over line and load conditions
  • Available in TO-220 and TO-263 packages
  • 3-A output load current
  • Input voltage range up to 40 V
  • Requires only four external components
  • Excellent line and load regulation specifications
  • 150-kHz Fixed-frequency internal oscillator
  • TTL shutdown capability
  • Low power standby mode, IQ, typically 80 µA
  • High efficiency
  • Uses readily available standard inductors
  • Thermal shutdown and current-limit protection
  • Create a custom design using the LM2596 with the WEBENCH Power Designer

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Description

The LM2596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 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, and an adjustable output version.

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

The LM2596 series operates at a switching frequency of 150 kHz, thus allowing smaller sized filter components than what would be required with lower frequency switching regulators. Available in a standard 5-pin TO-220 package with several different lead bend options, and a 5-pin TO-263 surface mount package.

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 WEBENCH Design with LMR33630.

A standard series of inductors are available from several different manufacturers optimized for use with the LM2596 series. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a ±4% tolerance on output voltage under specified input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 80 µA standby current. Self-protection features include a two stage frequency reducing current limit for the output switch and an overtemperature shutdown for complete protection under fault conditions.

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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

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Type Title Date
* Datasheet LM2596 SIMPLE SWITCHER® Power Converter 150-kHz 3-A Step-Down Voltage Regulator datasheet (Rev. E) Feb. 13, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles More components, more problems Jun. 13, 2016
Technical articles Have you been had? Check the stated vs. actual current limit Apr. 19, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles SIMPLE SWITCHER regulators deliver a powerful punch for years 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-1081 Low-Cost Low-Parts-Count DC/DC Converter With Multiple Outputs (Rev. B) Apr. 23, 2013
Application notes AN-1082 Adjust or Synchronize LM2586/88 Switching Frequency (Rev. B) Apr. 23, 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 Buck Converters Provide a Battery Charger and System Power Mar. 21, 2007
Application notes Simple Techniques Minimize Cross-Coupling in Distributed Power Systems 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
$29.00
Description
The LM2596S-ADJEVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM2596 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
SNVMA61.ZIP (72 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA62.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA63.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA64.ZIP (70 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA65.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMA66.ZIP (77 KB) - PSpice Model

CAD/CAE symbols

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

Ordering & quality

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