LM2679S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679S-3.3/NOPB is a SIMPLE SWITCHER® 5A step-down voltage regulator manufactured by Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed output voltage of 3.3V. The device features a switching frequency of 260kHz and supports a maximum output current of 5A. It utilizes a TO-263-8 surface-mount package and functions within a temperature range of -40°C to +125°C. The quiescent current is specified at 4.2mA.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a low on-resistance DMOS power switch for high efficiency exceeding 90%.
• Incorporates a fixed-frequency oscillator allowing the use of small external components.
• Features adjustable peak current limiting via external resistors to protect against faults.

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient pre-regulators for linear regulator systems
• Battery chargers
• Post regulators for PWM controllers

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' confirms lead-free status and RoHS compliance as per the manufacturer's datasheet. Confirm the package designation matches the required TO-263-8 footprint for PCB layout compatibility. Ensure the fixed 3.3V output variant aligns with the target circuit design requirements before 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 with up to 5A load capability. Consider the TO-263-8 package for thermal management needs in surface-mount applications. Evaluate the 260kHz switching frequency against EMI constraints and inductor size requirements compared to lower or higher frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 series of SIMPLE SWITCHER® regulators, which are monolithic integrated circuits designed for buck converter topologies. The series includes both fixed and adjustable output versions, offering robust line and load regulation characteristics suitable for general-purpose DC/DC conversion tasks.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2679S-3.3/NOPB is the direct lead-free equivalent of the LM2679S-3.3. Other variants within the same series include LM2679T-3.3/NOPB (TO-220 package) and LM2679SD-3.3/NOPB (VSON-14 package). Verify pinout and thermal pad configurations when substituting between different package types.