LM2576SX-12

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576SX-12 is a SIMPLE SWITCHER® series monolithic integrated circuit designed as a step-down (buck) switching voltage regulator. It provides a fixed 12V output with a maximum load current of 3A. The device operates from an input voltage range of 4V to 40V and features a fixed internal oscillator frequency of 52kHz. It includes thermal shutdown and current limit protection, requiring only four external components for operation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active functions for a buck converter topology including a fixed-frequency oscillator
• Provides high efficiency to serve as a direct replacement for popular three-terminal linear regulators
• Includes comprehensive fault protection mechanisms such as thermal shutdown and cycle-by-cycle current limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Direct replacement for three-terminal linear regulators in power supply designs
• Pre-regulator stages for switching downstream regulators
• Efficient point-of-load regulation circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix configuration when sourcing this component. Standard versions without the /NOPB suffix are generally obsolete or discontinued by Texas Instruments. Ensure that any available inventory matches the required RoHS compliance status and package type (TO-263-5) to avoid compatibility issues with modern manufacturing processes.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part for applications requiring a fixed 12V output at up to 3A with an input voltage up to 40V. Consider the TO-263-5 package for surface-mount assembly needs. Evaluate thermal performance requirements carefully, as the device dissipates significant heat under high load conditions compared to linear alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2576 family of SIMPLE SWITCHER® regulators. The 'S' designation indicates a surface-mount package variant, specifically the TO-263-5 form factor. This series is engineered to simplify switch-mode power supply design by minimizing external component count while maintaining robust performance characteristics.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2576SX-12/NOPB is the verified RoHS-compliant equivalent. Other manufacturers may offer pin-compatible alternatives, but electrical parameters must be validated against the original datasheet specifications.