General Description

The AOZ5473QE is a high efficiency synchronous buck

smart 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 lowside

MOSFET has ultra-low ON resistance to minimize

conduction loss.

Highly accurate current (IMON) and temperature (TMON)

monitors are integrated in AOZ5473QE. AOS digital

controllers, when used with AOZ5473QE, can digitize

IMON and TMON to provide fault protection and

telemetry via the digital communication bus. A dual

functionality TMON/FLT pin reports temperature

information during normal operating conditions and also

reports OC, OT, HS-short, LS-short faults. When a fault is

detected, the TMON/FLT pin is pulled high.

Dual-layer OC Protection includes a fixed 80 A detection

level which enable an OC fault flag and a 100 A cycle-bycycle

current limit. This second-level protection turns off

the high-side MOSFET, disabling the output. The

AOZ5473QE protection also includes thermal shutdown.

The bootstrap switch, with auto boot refresh feature, is

integrated into the driver. The low-side MOSFET can be

driven into diode emulation mode to provide

asynchronous operation when required. The pin-out is

optimized for low inductance routing of the converter,

keeping the parasitic effects to a minimum.

Features

 4.5V to 20V power supply range

 80A of current handling capability

 Integrated bootstrap with auto refresh

 Up to 1 MHz switching operation

 3.3V Tri-state PWM input compatible

 Fault detection

– Under-Voltage Lockout (UVLO) on VCC

– Over Current (OC)

– Over Temperature (OT)

– High-Side and Low-Side Short

 Thermal shutdown

 Cycle-by-cycle over current protection

 Integrated Current Monitor (IMON)

 Integrated Temperature Monitor (TMON)

 Low profile QFN5x6-39L package

Applications

 Server including processor and memory power

 Communications infrastructure systems

 High-current rails in server/cloud and storage systems

 Artificial intelligence and deep learning systems

 Single phase and multiphase POL

 GPU and gaming regulation