General Description

The AOZ5518QI is a high efficiency synchronous buck

power stage module consisting of two asymmetrical

MOSFETs and an integrated driver. The MOSFETs are

individually optimized for operation in the synchronous

buck configuration. The High-Side MOSFET is optimized

to achieve low capacitance and gate charge for fast

switching with low duty cycle operation. The Low-Side

MOSFET has ultra low ON resistance to minimize

conduction loss. The compact 5mm x 5mm QFN

package is optimally chosen and designed to minimize

parasitic inductance for minimal EMI signature.

The AOZ5518QI uses PWM and/or FCCM input for

accurate control of the power MOSFETs switching

activities, is compatible with 5V (CMOS) logic and

supports Tri-State PWM.

A number of features are provided making the

AOZ5518QI a highly versatile power module. The

bootstrap diode is integrated in the driver. The Low-Side

MOSFET can be driven into diode emulation mode to

provide asynchronous operation and improve light-load

performance. The pin-out is also optimized for low

parasitics, keeping their effects to a minimum.

Features

 4.5V to 25V power supply range

 4.5V to 5.5V driver supply range

 65A continuous output current

- Up to 80A with 10ms on pulse

- Up to 120A with 10μs on pulse

 Up to 2MHz switching operation

 5V PWM / Tri-State input compatible

 Under-Voltage LockOut protection

 FCCM pin control for Shutdown / Diode Emulation /

CCM operation

 Standard 5mm x 5mm QFN-31L package

Applications

 Notebook computers

 Memory and graphic cards

 VRMs for motherboards

 Point of load DC/DC converters

 Video gaming console