LM2576D-5.0RG

This series of voltage regulators are monolithic ICs providing step-down switching regulator functions capable of driving 3A loads, with excellent line and load regulation. The devices are available in 3.3V, 5V, 12V, and 15V fixed output voltages as well as an adjustable output version. An internally integrated frequency compensator and fixed-frequency oscillator significantly reduce the external component count and simplify implementation. Efficiency is substantially higher than popular three-terminal linear regulators, making these devices ideal drop-in replacements that typically require no heatsink or only a small one. The optimized design allows compatibility with standard inductor series available from multiple suppliers, simplifying switching power supply design. Additional features include: guaranteed output voltage accuracy of ±4% and oscillator frequency accuracy of ±10% under specified input voltage and output load conditions. An external shutdown circuit is provided with a typical standby current of 50uA. The output switch incorporates cycle-by-cycle current limiting and thermal shutdown for comprehensive protection under fault conditions.

Applications

• Simple, high-efficiency buck regulator
• High-efficiency pre-regulator for linear regulators
• On-board switching regulator
• Positive-to-negative voltage converter
• Negative voltage boost converter
• Battery charger power supply

Key features

• Fixed output voltages of 3.3V, 5V, 12V, 15V and adjustable output versions; adjustable versions provide output voltage from 1.23V to 37V (52V for high-voltage versions) under line and load conditions, with maximum error of +4%
• Guaranteed 3A output current
• Wide input voltage range: 40V (55V for high-voltage versions)
• Only 4 external components required
• 52kHz fixed-frequency internal oscillator
• TTL shutdown capability with low-power standby mode
• High efficiency
• Compatible with off-the-shelf standard inductors
• Thermal shutdown and current limiting protection