• New product available:LMR33630 36-V, 3-A,400-kHz synchronous converter

• 3.3-V, 5-V, 12-V, and adjustable output versions

• Adjustableversion output voltage range: 1.2-V to 37-V ±4% maximum over line and loadconditions

• Available in TO-220 and TO-263 packages

• 3-Aoutput load current

• Input voltage range up to 40 V

• Requiresonly four external components

• Excellent line and load regulationspecifications

• 150-kHz Fixed-frequency internaloscillator

• TTL shutdown capability

• Low power standby mode,IQ, typically 80μA

• Highefficiency

• Uses readily available standardinductors

• Thermal shutdown and current-limit protection

• Create a custom design using the LM2596 with theWEBENCHPower Designer

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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 table to 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 80μA 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.