LM2679SX-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SX-ADJ/NOPB is a SIMPLE SWITCHER® 5A step-down DC/DC switching regulator manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides an adjustable output voltage from 1.2V to 37V. The device features a fixed switching frequency of 260kHz, enabling the use of compact external components. It includes integrated soft-start, thermal shutdown, and resistor-programmable current limit functions. The component is housed in a TO-263-7 (D2PAK) surface-mount package and supports operation temperatures from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 260kHz fixed-frequency oscillator allows for smaller passive component sizes compared to lower-frequency alternatives.
• Resistor-programmable peak current limit enables customization of protection thresholds from 3A to 7A.
• Internal soft-start circuitry reduces input surge currents during power-up sequences.
• Built-in thermal shutdown protects the device and load under fault conditions.

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient pre-regulators for linear voltage regulator systems
• Battery charger circuits requiring adjustable current limits
• Point-of-load regulation in distributed power architectures

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against the manufacturer's latest datasheet to confirm pinout compatibility and lead-free status. Confirm that the TO-263-7 package matches the target PCB footprint. Check for obsolescence notices or recommended replacement parts, as legacy series may have limited future availability.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-current buck converter is needed with minimal external control complexity. The adjustable output voltage offers flexibility for various rail requirements. Ensure the application can accommodate the 260kHz switching frequency noise profile and that the thermal design supports the TO-263-7 package dissipation capabilities.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 family of SIMPLE SWITCHER regulators, originally developed by National Semiconductor before its acquisition by Texas Instruments. The family includes fixed-output variants (3.3V, 5V, 12V) and adjustable versions. The 'SX' designation indicates the D2PAK/TO-263 surface-mount package variant within the broader product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Consult official TI documentation for direct cross-references. Verify if newer generation SIMPLE SWITCHER devices offer improved efficiency or smaller packages suitable for the same electrical specifications.