LM2679SD-ADJ

Voltage Regulators - DC DC Switching Regulators Overview

The LM2679SD-ADJ/NOPB is a SIMPLE SWITCHER® step-down voltage regulator from Texas Instruments, designed for high-efficiency power conversion. It operates with an input voltage range of 8 V to 40 V and delivers up to 5 A output current. The adjustable output voltage spans from 1.2 V to 37 V. Key electrical parameters include a switching frequency of 260 kHz and a quiescent current of 4.2 mA. The device supports a shutdown function and functions within a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck topology simplifies design by providing all active components for step-down regulation in a single IC.
• Adjustable current limit feature protects the circuit against short circuits and overload conditions.
• High efficiency exceeding 90% achieved through low on-resistance internal switch and optimized control architecture.

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered systems requiring efficient voltage step-down
• Post-regulation for bus distribution networks
• Point-of-load (POL) DC/DC conversion modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer specifications. Confirm the package designation 'SD' corresponds to the 14-VSON form factor. Ensure the 'ADJ' variant matches the required adjustable output voltage range rather than fixed voltage options. Cross-reference datasheet revisions to confirm pinout consistency before integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an input voltage between 8 V and 40 V is available and an output current capability of 5 A is required. The adjustable output feature allows customization via external resistors. Consider the thermal performance of the VSON-14 package for heat dissipation requirements. Evaluate the 260 kHz switching frequency against EMI constraints and passive component size preferences.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2679 series of SIMPLE SWITCHER regulators, which are monolithic integrated circuits capable of driving up to 5 A loads. The series includes various packages such as TO-220 and DDPAK, and variants with fixed or adjustable outputs. The SD package specifically denotes a surface-mount VSON configuration suitable for compact designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2679SD-ADJ/NOPB serves as the direct lead-free replacement for the older LM2679SD-ADJ variant. Verify that the legacy part was discontinued and that the NOPB version maintains identical functional specifications and pinout compatibility.