LM2679SDX-ADJ/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SDX-ADJ/NOPB is a SIMPLE SWITCHER® 5A step-down voltage regulator from 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 programmable current limit functions. The unit is housed in a VSON-14 surface-mount package and supports operation across a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated 260kHz fixed-frequency oscillator for efficient design with smaller passive components
• Built-in soft-start capability to minimize inrush current during power-up
• Resistive programmable peak current limiting for customizable protection thresholds
• Internal thermal shutdown circuitry to safeguard against overheating conditions

Voltage Regulators - DC DC Switching Regulators Applications

• Efficient pre-regulators for linear voltage regulator systems
• Battery charger power supply circuits
• Post-regulation stages for bus distribution networks
• Direct conversion from 12V or 24V battery sources

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix configuration matches the required output voltage adjustment range and packaging format. Confirm that the VSON-14 footprint aligns with the target PCB layout constraints. Ensure compatibility with the intended thermal management strategy given the power dissipation characteristics. Cross-reference the manufacturer's latest datasheet revision to confirm active status and any pinout modifications before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a high-current buck converter is needed with minimal external part count. The adjustable output offers flexibility for various load requirements within the specified voltage window. Consider the 260kHz frequency trade-off between component size and electromagnetic interference. Evaluate the thermal performance requirements relative to the ambient operating environment and available heatsinking options on the printed circuit board.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the SIMPLE SWITCHER® family, designed for straightforward implementation of DC/DC conversion. It integrates the controller, power switch, and necessary protection logic into a single monolithic IC. The series emphasizes ease of design through standardized external component selection, reducing engineering time and complexity compared to discrete solutions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM2679S-ADJ/NOPB serves as a direct pin-compatible alternative utilizing a TO-263-7 package instead of VSON-14. Designers must account for differences in thermal resistance and physical dimensions when substituting packages. Verify that the lead-free designation remains consistent across both variants to maintain compliance with environmental regulations.