LM2599SX-12

Voltage Regulators - DC DC Switching Regulators Overview

The LM2599SX-12 is a SIMPLE SWITCHER power converter from Texas Instruments, functioning as a step-down switching voltage regulator. It operates with an input voltage range of 4.5 V to 40 V and provides a fixed 12 V output at up to 3 A. The device utilizes a 150 kHz internal oscillator for efficient DC-DC conversion. Packaged in the TO-263-8 (D2PAK) surface-mount format, it supports operation across a temperature range of -40°C to +125°C junction temperature.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 150 kHz fixed-frequency oscillator to minimize external component count
• Includes built-in thermal shutdown and current limit protection for system reliability
• Features TTL-compatible shutdown capability for low-power standby modes

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation modules
• Pre-regulators for linear post-regulators
• Efficient buck converters for battery-powered systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against the official datasheet to confirm pinout compatibility and electrical tolerances. Ensure the TO-263-8 package variant matches the target PCB footprint. Confirm RoHS compliance status if required by assembly specifications. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and supply chain integrity.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12 V output is required from a wide input voltage range up to 40 V. The 3 A output current capacity suits moderate power applications. Consider the TO-263-8 package for its thermal dissipation capabilities in surface-mount designs. Evaluate the 150 kHz switching frequency against EMI constraints and inductor size requirements compared to higher or lower frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2599 series of SIMPLE SWITCHER regulators, designed for high-efficiency step-down conversions. The SX suffix indicates the surface-mount D2PAK package variant. The '12' designation specifies the fixed 12 V output voltage option within the family, which also includes adjustable and other fixed voltage versions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult the manufacturer's cross-reference guide for verified equivalents. Verify that any substitute maintains the 3 A current rating, 40 V maximum input, and TO-263-8 package dimensions to ensure mechanical and electrical compatibility without redesigning the power stage.