AOZ5278QI

Overview

The AOZ5278QI is a Smart Power Stage (SPS) from Alpha & Omega Semiconductor, integrating two asymmetrical MOSFETs and a driver in a single package. It operates with a supply voltage range of 4.5V to 5.5V and supports load voltages up to 25V. The device delivers a continuous output current of 65A per channel with a peak current capability of 120A. It utilizes a 39-pin QFN package measuring 5x6 mm. The component functions as a half-bridge driver for synchronous buck converters, featuring PWM interface control and operating within a junction temperature range of -40°C to 150°C.

Feature Summary

• Integrates high-side and low-side MOSFETs with gate drive circuitry into a compact Smart Power Stage module.
• Includes built-in bootstrap circuit and diode emulation functionality for efficient synchronous rectification.
• Provides comprehensive fault protection mechanisms including over-current protection and under-voltage lockout.

Applications

• Synchronous buck converter designs
• Point-of-load (POL) regulation modules
• Server and workstation power distribution networks

Procurement Notes

Verify the specific suffix 'QI' to confirm RoHS compliance and lead-free status. Ensure the ordering part number matches the required tape and reel or cut tape packaging format. Confirm the manufacturer designation is Alpha & Omega Semiconductor Inc. to avoid counterfeit components. Check for any recent product change notices that may affect pin compatibility or thermal characteristics.

Selection Notes

Select this component when a compact solution for high-current synchronous buck applications is required. The integrated nature reduces board space compared to discrete driver and MOSFET combinations. Consider the 5x6mm footprint constraints and the need for adequate thermal dissipation given the 65A continuous current rating. Verify input voltage stability within the 4.5V to 5.5V range for proper driver operation.

Part Context

This device belongs to the AOZ5xxx series of Smart Power Stages designed for high-efficiency power conversion. It serves as an alternative to traditional discrete half-bridge solutions by combining power switches and logic drivers. The series targets applications demanding high power density and simplified design cycles in DC-DC conversion systems.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate other AOS SPS models with similar current ratings and package dimensions if direct substitution is necessary.

FAQ

What is the maximum load voltage supported by the AOZ5278QI?

The device supports load voltages ranging from 4.5V to 25V.

Does the AOZ5278QI include protection features?

Yes, it includes fault protection such as under-voltage lockout (UVLO) and over-current protection.