LM2599SX-5.0

Voltage Regulators - DC DC Switching Regulators Overview

The LM2599SX-5.0/NOPB is a SIMPLE SWITCHER power converter from Texas Instruments, functioning as a step-down voltage regulator with a fixed 5V output and 3A maximum current capability. It operates within an input voltage range of 4.5V to 40V at a fixed 150kHz switching frequency. The device utilizes pulse width modulation control and is housed in a TO-263-8 (D2PAK) surface-mount package. It supports an operating junction temperature range from -40°C to 125°C and includes built-in thermal shutdown and current limiting protection features.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated SIMPLE SWITCHER architecture simplifies design by requiring minimal external components for stable operation.
• Built-in thermal shutdown and current limit protection ensure robust performance under fault conditions.
• Fixed 150kHz internal oscillator allows the use of small, readily available standard inductors.

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation in distributed power systems
• Pre-regulation for linear post-regulators
• Efficient buck converters for battery-powered applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the part number suffix /NOPB indicates lead-free and RoHS compliance, as original National Semiconductor parts may differ. Confirm the manufacturer is Texas Instruments, which acquired the product line. Ensure the package matches the specified TO-263-8 form factor. Cross-reference datasheets to confirm pinout compatibility if replacing older non-NOPB variants.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5V output at up to 3A is required from an input source between 4.5V and 40V. The TO-263 package provides adequate thermal dissipation for moderate power levels without requiring extensive heatsinking in many applications. Consider the 150kHz frequency trade-off between component size and efficiency compared to higher-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2599 series of monolithic integrated step-down switching regulators. Originally developed by National Semiconductor, the product line is now managed by Texas Instruments. The 'SX' designation typically refers to the surface-mount D2PAK/TO-263 package variant, distinguishing it from through-hole versions like the LM2599T.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2599SX-5.0/NOPB is the direct successor to earlier National Semiconductor LM2599SX-5.0 parts. Verify RoHS compliance status when substituting pre-acquisition inventory. The functional pinout remains compatible with other LM2599 family members, but always check specific datasheet revisions for any minor electrical parameter shifts.