The LM2576 family of regulators are monolithic integrated circuits that perform all of the active operations for a step-down (buck) switching regulator capable of driving 3A loads while maintaining excellent line and load control. These devices are available in 3.3V, 5V, 12V, 15V, and configurable output voltage versions. These regulators are simple to operate and require only a few external components. They incorporate internal frequency compensation and a fixed-frequency oscillator. The LM2576 series replaces popular three-terminal linear regulators due to its high efficiency. It significantly reduces the size of the heat sink and, in some situations, eliminates the need for a heat sink entirely.

Features

• 5V output, +3% max over the line and load conditions
• Guaranteed 3A output current
• Wide input voltage range, 7V to 40V
• Requires only 4 external components
• 52 kHz fixed-frequency internal oscillator
• Low power standby mode, lq typically <200µA
• 80% Efficiency
• Uses readily available standard inductors
• Thermal shutdown and current limit protection
• 100% electrical thermal limit burn-in

Applications

• Simple high-efficiency step-down (buck) regulator
• Efficient pre-regulator for linear regulators
• On-card switching regulators
• Positive to Negative converter (Inverting, Buck-Boost)
• Isolated Flyback Converter using minimum number of External components
• Negative Boost Converter

SPECIFICATIONS