LM2574N-5.0/NOPB

The LM2574 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed - frequency oscillator. The LM2574 series offers a high - efficiency replacement for popular three - terminal linear regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed. A standard series of inductors optimized for use with the LM2574 are available from several different manufacturers. This feature greatly simplifies the design of switch - mode power supplies. Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 μA (typical) standby current. The output switch includes cycle - by - cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Applications

• Simple High - Efficiency Step - Down (Buck) Regulator
• Efficient Pre - Regulator for Linear Regulators
• On - Card Switching Regulators
• Positive to Negative Converter (Buck - Boost)

Key features

• 3.3V, 5V, 12V, 15V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range, 1.23V to 37V (57V for HV version) ±4% Max Over Line and Load Conditions
• Specified 0.5A Output Current
• Wide Input Voltage Range, 40V, up to 60V for HV Version
• Requires Only 4 External Components
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby Mode
• High Efficiency
• Uses Readily Available Standard Inductors
• Thermal Shutdown and Current Limit Protection