NB679AGD-Z

Overview

The NB679AGD-Z is a synchronous step-down DC/DC converter manufactured by Monolithic Power Systems. It operates with an input voltage range of 5.5 V to 26 V and provides a fixed 5 V output capable of delivering up to 8 A of continuous current. The device integrates a 700 kHz switching frequency and features adaptive constant on-time control for rapid transient response. Additional specifications include a quiescent current of 100 uA, internal soft-start, and comprehensive protection mechanisms such as over-current, over-voltage, under-voltage, and thermal shutdown. It is housed in a compact QFN-12 package.

Feature Summary

• Integrates adaptive constant on-time control architecture to ensure fast transient response during load changes.
• Supports stable operation with both ceramic and POS capacitors through an integrated DC auto-tuning loop.
• Includes a built-in 5 V LDO regulator with switchable functionality for auxiliary power requirements.
• Features comprehensive protection circuits including over-current, over-voltage, under-voltage, and thermal shutdown.

Applications

• Industrial automation systems requiring robust power regulation
• Telecommunications infrastructure equipment
• Consumer electronics devices utilizing high-current logic loads

Procurement Notes

Verify the specific suffix designation against official manufacturer documentation to confirm pinout compatibility and electrical characteristics. Ensure that the selected variant matches the required input voltage range and output configuration for the target application design.

Selection Notes

Select this component for designs requiring a fixed 5 V output at high currents within a wide input voltage window. Consider the QFN-12 package constraints for thermal management and PCB layout. Evaluate the need for the integrated LDO feature if auxiliary power rails are necessary within the system architecture.

Part Context

This part belongs to the NB679 series of synchronous buck converters from Monolithic Power Systems. The series is designed for applications demanding high efficiency and compact form factors. The NB679GD-Z and NB679GD-P variants share similar electrical profiles but may differ in packaging or ordering suffixes.

Replacement Considerations

Publicly confirmed substitute part numbers for the NB679AGD-Z are not available in the provided source material. Consult official manufacturer cross-reference guides for verified alternatives.