LM2585SX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2585SX-3.3/NOPB is a SIMPLE SWITCHER 3A Flyback Regulator manufactured by Texas Instruments, formerly National Semiconductor. It operates with an input voltage range of 4V to 40V and provides a fixed 3.3V output at up to 3A current capability. The device utilizes a TO-263 (DDPAK) package with five pins and supports a switching frequency of 115 kHz. It functions as a step-up wide VIN flyback regulator within an operating temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated SIMPLE SWITCHER controller for simplified flyback converter design
• Fixed 3.3V output voltage option for standard logic supply applications
• Wide input voltage range supporting 4V to 40V operation
• High efficiency step-up topology suitable for battery-powered systems

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered portable equipment requiring step-up conversion
• Industrial control systems needing isolated or non-isolated flyback power
• Automotive electronics operating within wide input voltage ranges
• Telecommunications infrastructure power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor is now part of Texas Instruments. Confirm the suffix /NOPB indicates lead-free/RoHS compliance. Ensure the SX variant corresponds to the TO-263 package. Cross-reference datasheet revisions to confirm pinout and electrical characteristics match your specific design requirements before procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from a variable or low input source using a flyback topology. Compare against the LM2586 series if shutdown functionality is needed, as the LM2585 lacks this feature. Consider thermal management requirements due to the 3A current rating and ensure the PCB layout supports the TO-263 package's heat dissipation capabilities for reliable operation.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the SIMPLE SWITCHER family of switching regulators designed for ease of use. The LM2585 specifically targets flyback applications, distinguishing it from the buck-only LM2586. The /NOPB suffix denotes a non-phosphorus lead-free version, aligning with environmental standards. The SX package designation identifies the surface-mount TO-263 form factor used in this specific ordering code.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2585SX-3.3/NOPB is the direct equivalent without the NOPB suffix. LM2585S-3.3/NOPB may be available depending on packaging preferences. For designs requiring shutdown, consider the LM2586S-3.3/NOPB instead.