LM2679SDX-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SDX-3.3/NOPB is a Texas Instruments SIMPLE SWITCHER® step-down switching regulator in a VSON-14 surface-mount package. It provides a fixed 3.3V output at up to 5A load current with an input voltage range of 8V to 40V. Operating at a fixed 260kHz frequency, it achieves high efficiency exceeding 90% using low on-resistance DMOS switches. The device features adjustable current limiting from 3A to 7A via external resistors, integrated thermal shutdown, and soft-start functionality to limit inrush current.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 260kHz fixed-frequency oscillator enables the use of compact passive components
• Adjustable peak current limit allows protection customization between 3A and 7A
• Built-in thermal shutdown protects against overheating during fault conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient pre-regulators for linear power supply systems
• Battery charging circuits requiring precise current control
• High-efficiency DC/DC step-down conversion modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the suffix 'NOPB' confirms lead-free status and RoHS compliance per manufacturer specifications. Confirm the 'SDX' designation matches the required VSON-14 tape-and-reel packaging format. Ensure the '3.3' identifier aligns with the specific fixed output voltage requirement for the target circuit design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V rail is needed with up to 5A capacity. The VSON-14 package suits space-constrained surface-mount designs. Consider the adjustable current limit feature if system protection thresholds require setting outside standard factory defaults. Verify compatibility with available 260kHz inductor options.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 family of SIMPLE SWITCHER regulators, which includes TO-220 through-hole (T), TO-263 surface-mount (S), and VSON (SD) variants. All versions share the same core buck topology and 5A capability but differ in thermal performance and physical mounting style. The SDX variant specifically targets automated surface-mount assembly processes.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2679SD-3.3/NOPB: Identical functional specification without the reel packaging designation.