General Description

The AOZ5311NQI 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 AOZ5311NQI uses a PWM input for accurate control

of the power MOSFETs switching activities, is compatible

with 3V and 5V (CMOS) logic and supports Tri-State

PWM.

A number of features are provided making the

AOZ5311NQI a highly versatile power module. The bootstrap

switch 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

 2.5V to 20V power supply range

 4.5V to 5.5V driver supply range

 55A continuous output current

- Up to 80A for 10ms on pulse

- Up to 120A for 10us on pulse

 Up to 2MHz switching operation

 3V / 5V PWM / Tri-State input compatible

 Under-Voltage lockout protection

 SMOD# control for Diode Emulation / CCM operation

 < 1mV detection threshold for efficient ZCD control

 Low profile 5x5 QFN-31L package

Applications

 Memory and graphic cards

 VRMs for motherboards

 Point of load DC/DC converters

 Video gaming console