LM2679S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679S-3.3 is a SIMPLE SWITCHER 5A step-down voltage regulator manufactured by National Semiconductor, now maintained under the Texas Instruments brand following the 2011 acquisition. This monolithic integrated circuit provides a fixed 3.3V output with an input voltage range of 8V to 40V. It utilizes a buck topology and operates at a switching frequency of 260kHz. The device features adjustable current limit protection and supports surface-mount installation in a TO-263 package. It functions within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates all active components required for a 5A step-down switching regulator
• Includes internal high-frequency switch and adjustable current limit protection
• Delivers excellent line and load regulation characteristics

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load DC/DC conversion
• Pre-regulator circuits for linear regulators
• Efficient battery-powered systems requiring 5A loads

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm that the part number suffix corresponds to the correct package type and output voltage specification. Ensure compliance with RoHS directives if required for the specific application environment. Review datasheet revisions for any updates regarding thermal performance or electrical characteristics before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from an 8V to 40V input source. Consider the 260kHz switching frequency for balancing efficiency and external component size. Evaluate thermal management requirements due to the 5A output capability. Compare against other SIMPLE SWITCHER series options if variable output voltages or different current ratings are needed.

Voltage Regulators - DC DC Switching Regulators Part Context

Originally designed by National Semiconductor, the LM2679 series was acquired by Texas Instruments in 2011. The product continues to be supported under the TI brand. The LM2679 family includes both fixed and adjustable output versions. This specific model represents the fixed 3.3V variant within the broader SIMPLE SWITCHER portfolio known for high-efficiency power management solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult official replacement lists for discontinued parts. Verify pinout compatibility and electrical specifications before substituting.