LM2679T-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679T-ADJ/NOPB is a monolithic integrated circuit designed as a step-down switching regulator within the SIMPLE SWITCHER family. It provides a fixed output voltage of 12 V with a maximum output current capability of 5 A. The device operates from an input voltage range of 8 V to 40 V and utilizes a buck topology. Key electrical parameters include a switching frequency of 260 kHz, a typical quiescent current of 4.2 mA, and a shutdown feature for power management. It supports through-hole installation in a TO-220-7 package and functions reliably across an operating temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a high-efficiency DMOS power switch capable of driving up to 5 A loads
• Features a fixed 260 kHz internal oscillator allowing for smaller external component sizes
• Includes programmable current limit and thermal shutdown protection mechanisms
• Supports soft-start functionality via an external timing capacitor to reduce input surge current

Voltage Regulators - DC DC Switching Regulators Applications

• High-efficiency step-down switching regulators
• Pre-regulators for linear power supply systems
• Battery charger circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix 'NOPB' confirms lead-free compliance and RoHS standards as per the manufacturer's datasheet. Confirm the package designation matches the required TO-220-7 through-hole configuration. Ensure the part number corresponds to the fixed 12 V output variant rather than adjustable or other voltage versions. Check for any obsolescence notices or design-in restrictions provided by Texas Instruments before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust, high-current buck converter is needed for through-hole applications. The 12 V fixed output simplifies design compared to adjustable variants. Consider the 260 kHz frequency for balancing efficiency and passive component size. Evaluate thermal performance requirements given the 5 A current rating and ensure adequate heatsinking for the TO-220 package under full load conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 series of switching regulators, originally developed by National Semiconductor and maintained by Texas Instruments following its acquisition. The series is characterized by the SIMPLE SWITCHER design philosophy, emphasizing ease of use with minimal external components. The LM2679T-ADJ/NOPB specifically represents the through-hole, 12 V fixed-output version of this widely used regulator family.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2679T-12/NOPB