LM2596SX-ADJ/NOPB

ACTIVE

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

Quality information

More LM2596 information

• Parametrics

• Technical documentation

• Design & development

• Support & training

Packaging information

 View TI packaging information

Features for the LM2596

• 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 for the LM2596

The LM2596 series of regulators are monolithic integrated circuits that provide all theactive functions for a step-down (buck) switching regulator, capable of driving a 3-A load withexcellent 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 andinclude internal frequency compensation, and a fixed-frequency oscillator.

The LM2596 series operates at a switching frequency of 150 kHz, thus allowing smallersized 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-pinTO-263 surface mount package.

The new product,LMR33630,offers reduced BOM cost, higher efficiency, and an 85% reduction in solution size among many otherfeatures. See thedevicecomparison tableto compare specs.StartWEBENCH Design with LMR33630.

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

Other features include a ±4% tolerance on output voltage under specified input voltageand 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 frequencyreducing current limit for the output switch and an overtemperature shutdown for completeprotection under fault conditions.