LM2576T-ADJ/NOPB

ACTIVE

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

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More LM2576 information

• Parametrics

• Technical documentation

• Design & development

• Support & training

Packaging information

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Features for the LM2576

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

• 3.3-V, 5-V, 12-V, 15-V, and adjustable output versions

• Adjustable version output voltage range: 1.23 V to 37 V (57 V for HV version) ±4% maximum over line and load conditions

• Specified 3-A output current

• Wide input voltage range: 40 V Up to 60 V for HV version

• Requires only four external components

• 52-kHz Fixed-frequency internal oscillator

• TTL-shutdown capability, low-power standby mode

• High efficiency

• Uses readily available standard inductors

• Thermal shutdown and current limit protection

• Create a Custom Design with WEBENCH Tools

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Description for the LM2576

The LM2576 series of regulators are monolithic integrated circuits that provide all theactive functions for a step-down (buck) switching regulator, capable of driving 3-A load withexcellent line and load regulation. These devices are available in fixed output voltages of 3.3 V,5 V, 12 V, 15 V, and an adjustable output version.

Requiring a minimum number of external components, these regulators are simple to use andinclude fault protection and a fixed-frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linearregulators. It substantially reduces the size of the heat sink, and in some cases no heat sink isrequired.

A standard series of inductors optimized for use with the LM2576 are available fromseveral different manufacturers. This feature greatly simplifies the design of switch-mode powersupplies.

Other features include a ±4% tolerance on output voltage within specified input voltagesand output load conditions, and ±10% on the oscillator frequency. External shutdown is included,featuring 50-µA (typical) standby current. The output switch includes cycle-by-cycle currentlimiting, as well as thermal shutdown for full protection under fault conditions.

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. Start aWEBENCHDesign with LMR33630.