LM2576T-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576T-ADJ/NOPB is a SIMPLE SWITCHER power regulator from Texas Instruments, configured as a step-down (buck) converter. It operates with an input voltage range of 4V to 40V and delivers a maximum output current of 3A. The output voltage is adjustable via external resistors, typically ranging from 1.23V to 37V. The device integrates a fixed-frequency internal oscillator operating at 52kHz. Key electrical specifications include a typical quiescent current of 5mA and a guaranteed output voltage tolerance of ±4% under specified conditions. It features thermal shutdown and cycle-by-cycle current limiting for protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a fixed-frequency 52kHz oscillator to simplify external component selection and reduce design complexity.
• Includes built-in thermal shutdown and cycle-by-cycle current limiting to ensure robust operation under fault conditions.
• Supports TTL-compatible shutdown control for low-power standby applications with minimal quiescent current consumption.

Voltage Regulators - DC DC Switching Regulators Applications

• Distributed power supply systems requiring efficient step-down conversion
• Pre-regulator circuits for switching regulators
• Efficient linear regulator replacements where heat dissipation is a constraint

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific manufacturer source, as the LM2576 family is produced by multiple vendors including Texas Instruments, onsemi, and others. Ensure the ordering suffix matches the required package type and temperature rating. Confirm RoHS compliance status directly with the supplier documentation, as historical versions may differ. Cross-reference the datasheet revision to ensure pinout and electrical characteristics align with your design requirements before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-efficiency buck converter is needed to replace linear regulators in applications with significant input-to-output voltage differentials. The TO-220-5 package provides adequate thermal performance for up to 3A loads without excessive heatsinking in many scenarios. Consider the 52kHz switching frequency when designing the external inductor and capacitor values to balance size and ripple performance against electromagnetic interference constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 series of SIMPLE SWITCHER regulators, designed to offer ease of use and flexibility for standard 5V, 12V, and adjustable outputs. The 'T' suffix indicates the TO-220-5 through-hole package, while '/NOPB' denotes a lead-free, halogen-free product compliant with RoHS standards. It serves as a direct functional replacement for older three-terminal linear regulators in various industrial and commercial power supply designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible substitutes include the LM2576T-ADJ manufactured by onsemi and National Semiconductor. Verify that alternative sources maintain the same 52kHz oscillation frequency and thermal protection thresholds to ensure circuit stability without redesigning the feedback network or protection components.