LM2596S-5.0资料

LM2596

SNVS124C–NOVEMBER1999–REVISED APRIL2013 LM2596SIMPLE SWITCHER®Power Converter150kHz

3A Step-Down Voltage Regulator

Check for Samples:LM2596

FEATURES DESCRIPTION

The LM2596series of regulators are monolithic • 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 to37V±4%Max Over Line and Load driving a3A load with excellent line and load

Conditions regulation.These devices are available in fixed output

voltages of3.3V,5V,12V,and an adjustable output •Available in TO-220and TO-263Packages

version.

•Ensured3A Output Load Current

Requiring a minimum number of external •Input Voltage Range Up to40V

components,these regulators are simple to use and •Requires Only4External Components

include internal frequency compensation,and a •Excellent Line and Load Regulation fixed-frequency oscillator.

Specifications

The LM2596series operates at a switching frequency •150kHz Fixed Frequency Internal Oscillator of150kHz thus allowing smaller sized filter

•TTL Shutdown Capability components than what would be needed with lower

frequency switching regulators.Available in a •Low Power Standby Mode,I Q Typically80μA

standard5-lead TO-220package with several •High Efficiency different lead bend options,and a5-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 LM2596series.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

typically80μA 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

fault conditions.(1)

(1)†Patent Number5,382,918.

Typical Application

(Fixed Output Voltage Versions)

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.

SWITCHER is a registered trademark of Texas Instruments.

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.