LM2596S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2596S-3.3/NOPB is a Texas Instruments SIMPLE SWITCHER power converter, functioning as a 150 kHz step-down voltage regulator in a surface-mount TO-263 package. It provides a fixed nominal output of 3.3V with a maximum load current capability of 3A. The device operates within an input voltage range of 4.5V to 40V and supports an output voltage up to 37V for adjustable variants, though this specific model is fixed. It features internal frequency compensation and a fixed-frequency oscillator. The component is rated for operation from -40°C to +125°C, complies with RoHS standards, and includes built-in thermal shutdown and current limiting protection circuits.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 150 kHz fixed-frequency oscillator and internal frequency compensation to minimize external filter component size.
• Provides high-efficiency buck conversion with excellent line and load regulation characteristics.
• Includes comprehensive protection mechanisms such as thermal shutdown and current limiting.
• Requires only four external components for standard operation, simplifying circuit design.

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 input-output differential is significant

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free status and compliance with RoHS directives. Ensure the 'S' designation matches the required TO-263 surface mount package rather than the through-hole TO-220 variant. Confirm the '-3.3' identifier corresponds to the fixed 3.3V output version, distinct from the adjustable ADJ or other fixed voltage options like 5.0V or 12V.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at up to 3A is required from an input source between 4.5V and 40V. The TO-263 package is suitable for applications needing better thermal performance than smaller SMD packages while maintaining surface mount compatibility. Consider the 150 kHz switching frequency for balancing component size against electromagnetic interference requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2596 series of SIMPLE SWITCHER power converters originally developed by National Semiconductor and now manufactured by Texas Instruments. The series is characterized by its simplicity, requiring minimal external components. The LM2596S-3.3/NOPB specifically denotes the surface-mount version with a fixed 3.3V output and lead-free construction.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2596S-3.3 (Non-NOPB versions may differ in environmental compliance). LM2596SX-3.3 (Identical electrical specifications; verify package tolerance if critical).