LM2596

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SNVS124C – NOVEMBER 1999 – REVISED APRIL 2013

3A Step-Down Voltage Regulator

Check for Samples: LM2596

1

FEATURES

DESCRIPTION

The LM2596 series of regulators are monolithic

23

•

3.3V, 5V, 12V, and Adjustable Output Versions

integrated circuits that provide all the active functions

•

Adjustable Version Output Voltage Range,

for a step-down (buck) switching regulator, capable of

1.2V to 37V ±4% Max Over Line and Load

driving a 3A load with excellent line and load

Conditions

regulation. These devices are available in fixed output

voltages of 3.3V, 5V, 12V, and an adjustable output

•

Available in TO-220 and TO-263 Packages

version.

•

Ensured 3A Output Load Current

Requiring

a

minimum

number

of

external

•

Input Voltage Range Up to 40V

components, these regulators are simple to use and

•

Requires Only 4 External Components

include internal frequency compensation , and a

•

Excellent Line and Load Regulation

fixed-frequency oscillator.

Specifications

The LM2596 series operates at a switching frequency

•

150 kHz Fixed Frequency Internal Oscillator

of

150

kHz

thus

allowing

smaller

sized

filter

•

TTL Shutdown Capability

components than what would be needed with lower

frequency

switching

regulators.

Available

in

a

•

standard

5-lead

TO-220

package

with

several

•

High Efficiency

different lead bend options, and a 5-lead TO-263

•

Uses Readily Available Standard Inductors

surface mount package.

•

Thermal Shutdown and Current Limit

A standard series of inductors are available from

Protection

several different manufacturers optimized for use with

the LM2596 series. This feature greatly simplifies the

APPLICATIONS

design of switch-mode power supplies.

•

Simple High-Efficiency Step-Down (Buck)

Other features include a ensured ±4% tolerance on

Regulator

output voltage under specified input voltage and

output load conditions, and ±15% on the oscillator

•

On-Card Switching Regulators

frequency. External shutdown is included, featuring

•

Positive to Negative Converter

typically 80

μA standby current. Self protection

features include a two stage frequency reducing

current limit for the output switch and an over

temperature shutdown for complete protection under

(1)

† Patent Number 5,382,918.

Typical Application

(Fixed Output Voltage Versions)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

SIMPLE SWITCHER is a registered trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.