LM2575T-3.3G

This series of voltage regulators are monolithic integrated circuits that provide all the functions of a buck switching regulator, capable of driving 2A loads with excellent line and load regulation performance. The devices offer fixed output voltages of 3.3V, 5V, 12V, and 15V, as well as adjustable output versions. With on-chip frequency compensation and a fixed-frequency oscillator, the external component count is greatly reduced, simplifying the design. Compared to common three-terminal linear regulators, these devices offer significantly higher efficiency and serve as ideal replacements, typically requiring no heatsink or only a small one. This series has been optimized for use with standard series inductors available from multiple inductor manufacturers, greatly simplifying switching power supply design. Additional features include: output voltage accuracy of ±4% and oscillator frequency accuracy of ±10% under specified input voltage and output load conditions. An external shutdown circuit supports standby current as low as 50μA (typical). The output switch incorporates cycle-by-cycle current limiting and thermal shutdown for full 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 voltage options: 3.3V, 5V, 12V, 15V, plus adjustable output versions
• Adjustable output versions: 1.23 ~ 37V output range (52V for high-voltage versions) under line and load conditions, with maximum error of +4%
• Guaranteed 2A output current
• Wide input voltage range, up to 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 standard off-the-shelf inductors
• Thermal shutdown and current limiting protection