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