TDSEMIC LM2576T-5.0

The LM2576 series regulators are monolithic integrated circuits that provide all active functions required for a step-down switching regulator, capable of driving a 3A load with excellent line and load regulation. The series offers fixed output voltages of 3.3V, 5V, and 12V, as well as an adjustable output version. These regulators require a minimum number of external components, are easy to use, and incorporate internal frequency compensation and a fixed-frequency oscillator. The LM2576 series serves as a high-efficiency replacement for popular three-terminal linear regulators, significantly reducing heatsink size and, in some cases, eliminating the need for a heatsink altogether. Standard inductor series optimized for the LM2576 are available from multiple manufacturers, greatly simplifying switching power supply design. Additional features include: guaranteed output voltage tolerance of ±4% under specified input voltage and output load conditions, and oscillator frequency tolerance of ±10%. The device includes an external shutdown function with a typical standby current of 50 μA. The output switch incorporates cycle-by-cycle current limiting and thermal shutdown for full protection under fault conditions. The LM2576 is available in TO220T-5L and TO263-5L packages.

• Fixed output versions: 3.3V, 5V, 12V; adjustable output version available
• High efficiency
• 3A output current guaranteed
• Only 4 external components required
• 52 kHz fixed-frequency internal oscillator
• TTL-level shutdown capability with low-power standby mode
• Compatible with standard off-the-shelf inductors
• Thermal shutdown and current limiting protection
• Adjustable version output voltage range: 1.23V to 37V (maximum ±4% deviation under specified line and load conditions)

• Simple, high-efficiency buck regulator
• High-efficiency pre-regulator for linear regulators
• On-board switching regulator
• Positive-to-negative voltage converter