• 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 4 External Components

• 52-kHz Fixed-Frequency Internal Oscillator

• TTL-Shutdown Capability, Low-Power Standby Mode

• High Efficiency

• Uses Readily Available Standard Inductors

• Create aCustom Design with WEBENCH Tools

• Thermal Shutdown and Current Limit Protection

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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.