AOZ5311NQI_1

Power Driver Modules Overview

The AOZ5311NQI is a high-current, high-performance DrMOS power module from Alpha & Omega Semiconductor Inc. It integrates two asymmetrical MOSFETs and an internal driver for synchronous buck applications. The module supports a 2.5V to 20V input range with a 4.5V to 5.5V driver supply. It delivers 55A continuous output current, up to 80A for 10ms pulses, and 120A for 10µs pulses. Operating frequencies reach 2MHz. It features 3V/5V PWM compatibility, Tri-State support, UVLO, and SMOD# control for diode emulation.

Power Driver Modules Feature Summary

• Integrates optimized asymmetrical High-Side and Low-Side MOSFETs with an internal gate driver for efficient synchronous buck conversion.
• Supports Diode Emulation Mode (DCM) via SMOD# pin to enhance light-load performance and enable asynchronous operation.
• Includes integrated bootstrap switch and Zero Cross Detection (ZCD) circuitry for simplified design and accurate current sensing.
• Provides thermal warning flag (THWN) and Under-Voltage Lockout (UVLO) protection mechanisms.

Power Driver Modules Applications

• Memory and graphic cards
• VRMs for motherboards
• Point of load DC/DC converters
• Video gaming console

Power Driver Modules Procurement Notes

Verify the exact suffix against official documentation, as ordering codes may indicate specific environmental or testing variations not detailed in general descriptions. Confirm RoHS compliance status and package type directly with the manufacturer or authorized distributors before procurement. Ensure the component meets all required operating temperature ranges and electrical specifications for the target application.

Power Driver Modules Selection Notes

Select this module for applications requiring high efficiency at low duty cycles due to the optimized High-Side MOSFET characteristics. Consider the 5x5 QFN-31L package constraints for PCB layout, particularly regarding thermal dissipation through exposed pads. Evaluate the need for Diode Emulation Mode if light-load efficiency is critical. Ensure the external controller supports the required PWM logic levels and Tri-State functionality.

Power Driver Modules Part Context

This component belongs to the AOZ5311 series of DrMOS power modules designed by Alpha & Omega Semiconductor Inc. These modules are engineered for high-density power delivery systems where space and efficiency are paramount. The integration of drivers and MOSFETs reduces parasitic inductance compared to discrete solutions.

Power Driver Modules Replacement Considerations

Public confirmed substitute part numbers: AOZ5311NQI_2, AOZ5311NQI-03.

Power Driver Modules FAQ

How does the SMOD# pin affect operation?

Pulling the SMOD# pin low enables Discontinuous Conduction Mode (DCM) or Diode Emulation, allowing the Low-Side MOSFET to operate asynchronously during light loads or startup. Keeping it high maintains Continuous Conduction Mode (CCM).

What is the function of the THWN pin?

The THWN pin is an open-drain thermal warning indicator. It pulls low when the internal driver IC junction temperature exceeds 150°C, resetting when the temperature drops below 120°C.

Is Tri-State PWM input supported?

Yes, the AOZ5311NQI supports Tri-State PWM inputs. When the PWM signal enters the Tri-State window, both High-Side and Low-Side MOSFETs are turned off, placing the switching node in a high-impedance state.