LM2574MX-5.0/NOPB

3.3-V, 5-V, 12-V, 15-V, and Adjustable Output Versions Adjustable Version Output Voltage Range: 1.23 V to 37 V (57 V for HV version) ±4% Maximum Over Line and Load Conditions Specified 0.5-A Output Current Wide Input Voltage Range: 40 V, up to 60 V 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 Create a Custom Design Using the LM2574 With the WEBENCH Power Designer The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5-A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, 15 V, 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 LM2574xx 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 (PCB) 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 Preregulator for Linear Regulators
• On-Card Switching Regulators
• Positive-to-Negative Converter (Buck-Boost)

Key features

• 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output Versions
• Adjustable Version Output Voltage Range: 1.23 V to 37 V (57 V for HV version) ±4% Maximum Over Line and Load Conditions
• Specified 0.5-A Output Current
• Wide Input Voltage Range: 40 V, up to 60 V 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
• A specified ±4% tolerance on output voltage within specified input voltages and output load conditions
• ±10% on the oscillator frequency
• External shutdown 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