LM2576T 3.3V StepDown Switching Regulator

LM2576 fixed 3.3 volts step down voltage regulator in TO220 (5) package

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3-A load with excellent 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.

LM2576 Voltage regulator are designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2576 voltage regulator are offered by several different inductor manufacturers.

Since the LM2576 converter IC is a switch−mode power supply, its efficiency is significantly higher in comparison with popular three−terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated is so low that no heat sink is required or its size could be reduced dramatically. A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch−mode power supplies. The LM2576 voltage regulator features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80 uA (typical) standby current. The output switch includes cycle−by−cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

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Features of LM2576-3.3V Voltage Regulator

• Output Voltage (Vin = 12 V, ILoad = 0.5 A, TJ = 25°C) Vout Min:3.2V; Max:3.4V

• Efficiency (Vin = 15 V, ILoad = 3.0 A) η=77%
  

• Guaranteed 3.0 A Output Current

• Wide Input Voltage Range

• 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

• Thermal Shutdown and Current Limit Protection

• Moisture Sensitivity Level (MSL) Equals 1

• Pb−Free Packages are Available

Applications of LM2576-3.3V Voltage Regulator

• Simple High−Efficiency Step−Down (Buck) Regulator
• Efficient Pre−Regulator for Linear Regulators
• On−Card Switching Regulators
• Positive to Negative Converter (Buck−Boost)
• Negative Step−Up Converters
• Power Supply for Battery Chargers

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LM2576 3.3 Volts Step Down Voltage Regulator Datasheet

Package Includes

1 x LM2576T 3.3 Volts Step Down Voltage Regulator