Microchip | LM2576-12WU

The LM2576-12WU series of monolithic integrated circuits provide all the active functions for a step-down (buck) switching regulator. Fixed versions are available with a 3.3 V, 5 V, or 12 V fixed output. Adjustable versions have an output voltage range from 1.23 V to 37 V. Both versions are capable of driving a 3 A load with excellent line and load regulation.

These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator. The LM2576 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required.

Features:

• 3.3 V, 5 V, 12 V, and adjustable output versions
• Voltage over specified line and load conditions
• Fixed version: ±3% max. output voltage
• Adjustable version: ±2% max. feedback voltage
• Guaranteed 3 A output current
• Wide input voltage range 
• Wide output voltage range 
• Requires only 4 external components
• 52 kHz fixed frequency internal oscillator
• Low power standby mode IQ typically < 200 µA
• 80% efficiency (adjustable version typically > 80%)
• Uses readily available standard inductors
• Thermal shutdown and current limit protection
• 100% electrical thermal limit burn-in

Applications:

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