AOZ2151TQI-19

Overview

The AOZ2151TQI-19 is a high-efficiency, synchronous step-down DC/DC converter manufactured by Alpha & Omega Semiconductor. It operates with an input voltage range up to 28V and provides a positive adjustable output voltage starting from 0.8V. The device delivers a continuous output current of 4A. It is housed in an 18-PowerWFQFN package (3x3 mm). Key electrical characteristics include a switching frequency that supports compact external component sizing and integrated protection features such as over-current and thermal shutdown.

Feature Summary

• High-efficiency synchronous buck regulation architecture
• Integrated EZBuck technology for simplified design
• Adjustable output voltage capability
• Compact power QFN package for space-constrained applications

Applications

• Portable electronic devices requiring efficient power conversion
• Industrial control systems with 24V input rails
• Communication equipment power supplies
• Battery-powered consumer electronics

Procurement Notes

Verify the specific suffix -19 against the manufacturer's latest datasheet to confirm pinout and electrical tolerances. Ensure compatibility with the intended PCB footprint for the 18-QFN package. Check for RoHS compliance status if required by your manufacturing standards. Confirm availability through authorized distributors as lead times may vary based on production schedules.

Selection Notes

Select this component when a 4A output current is required from inputs up to 28V. The adjustable output feature allows flexibility for various logic levels. Consider the thermal performance of the 3x3mm QFN package in your enclosure design. Compare efficiency curves at your specific load conditions against alternative regulators to ensure optimal system battery life or heat dissipation requirements are met.

Part Context

This part belongs to the AOZ2151 series of EZBuck converters from Alpha & Omega Semiconductor. The series is designed for high-density power applications. The -19 suffix typically denotes a specific tape and reel quantity or packaging variant within the standard product line. It shares architectural similarities with other members of the AOZ21xx family but is distinct in its specific output current rating and package configuration.

Replacement Considerations

Direct replacements must match the 28V input, 4A output, and 18-QFN form factor. Verify that any substitute regulator maintains compatible feedback resistor networks for the desired output voltage. Ensure the replacement supports similar switching frequencies to avoid EMI issues with existing filters.