LM2587SX-12/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2587SX-12/NOPB is a step-up/flyback switching regulator manufactured by Texas Instruments, formerly National Semiconductor. It operates with an input voltage range of 4 V to 40 V and provides a fixed 12 V output. The device supports up to 6.5 A output current in flyback topology and features a 100 kHz switching frequency. It includes internal compensation, a 3-A switch, and shutdown functionality. Packaged in TO-263-5 (DPAK) for surface mount applications, it functions within a temperature range of -40 °C to +125 °C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 3-A power switch enables high-current operation without external components
• Fixed 12 V output option eliminates external feedback resistor networks
• Internal frequency compensation simplifies design and reduces component count
• Shutdown pin allows for system power management and standby mode control

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Battery-powered systems requiring voltage step-up
• Telecommunications equipment power supplies
• Embedded controller power distribution

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the suffix 'SX' indicates tape-and-reel packaging versus 'S' for tube. Ensure the 'NOPB' designation confirms lead-free and RoHS compliance. Cross-reference the specific datasheet revision to validate electrical characteristics against your design requirements.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12 V output is required from a wide input range. The flyback topology supports isolated or non-isolated step-up configurations. Consider thermal performance due to the integrated switch current rating. Compare against the LM2588 series if higher switching frequencies are needed for smaller passive components.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the SIMPLE SWITCHER family of regulators. It represents the legacy National Semiconductor product line now managed by Texas Instruments. The LM2587 series is designed for ease of use with minimal external components. It serves as a drop-in replacement for older discrete switching solutions in industrial and commercial applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2587S-12/NOPB
• LM2587T-12/NOPB

Voltage Regulators - DC DC Switching Regulators FAQ

What is the maximum output current capability?

The device supports up to 6.5 A output current in flyback configuration.

Does the SX suffix change the electrical function?

No, the SX suffix only denotes the tape-and-reel packaging format; electrical specifications remain identical to the S version.