LM2596S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2596S-3.3 is a monolithic integrated circuit step-down switching regulator manufactured by UMW, belonging to the LM2596 series. It functions as a DC-DC buck converter capable of driving a 3A load with excellent line and load regulation. The device provides a fixed 3.3V output voltage and operates at a 150kHz switching frequency, allowing for smaller filter components compared to lower-frequency regulators. It features an internal oscillator, frequency compensation, and requires minimal external components. The unit is housed in a TO-263-5 surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated fixed-frequency oscillator and internal frequency compensation simplify power supply design
• Built-in thermal shutdown and current-limiting protection circuits ensure operational safety
• Low standby current consumption enables efficient external shutdown capabilities
• Requires only four external components for complete buck converter implementation

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient step-down voltage regulation for embedded systems
• Pre-regulator stages for linear post-regulators
• Direct conversion from higher bus voltages to standard logic levels
• Battery-powered equipment requiring high-efficiency power management

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify manufacturer authenticity as multiple vendors produce this component. Confirm the suffix indicates the specific 3.3V fixed output variant. Check datasheet revisions for pinout consistency across different production batches. Ensure the TO-263 package matches the target PCB footprint requirements before finalizing orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this model when a stable 3.3V rail is required from input voltages up to 40V. It is suitable for designs needing up to 3A continuous current without complex feedback networks. Consider thermal management solutions if operating near maximum load limits. Verify that the 150kHz switching frequency aligns with electromagnetic interference constraints in the target application environment.

Voltage Regulators - DC DC Switching Regulators Part Context

This component is part of the widely adopted LM2596 family of switching regulators originally developed by National Semiconductor and now produced by various manufacturers including UMW. The 'S' designation denotes the surface-mount TO-263 package variant, offering improved thermal performance and space efficiency compared to through-hole versions. It remains a standard solution for general-purpose DC-DC conversion tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2596S-3.3/NOPB (Texas Instruments)
• LM2596SX-3.3 (Texas Instruments)