FEATURES AND BENEFITS
• 3-phase bridge MOSFET driver
• Bootstrap gate drive for N-channel MOSFET bridge
• Cross-conduction protection with adjustable dead time
• Charge pump for low supply voltage operation
• Operation at any PWM duty cycle up to and including 100%
• 4.5 to 50 V supply voltage operating range
• Supply for external isolator
• Three programmable current sense amplifiers
• SPI-compatible serial interface
• Bridge control by direct logic inputs or serial interface
• Q&A watchdog
• Extensive programmable diagnostics
• Diagnostic verification
• Safety-assist features
• Automotive AEC-Q100 qualified
• A2-SIL™ product—device features for
safety-critical systems*

DESCRIPTION
The AMT49106 is an N-channel power MOSFET driver
capable of controlling MOSFETs connected in a 3-phase
bridge arrangement and is specifically designed for automotive
applications with high-power inductive loads, such as BLDC
motors.
A unique charge pump regulator provides the supply for the
MOSFET gate drive for battery voltages down to 5.5 V and
allows the AMT49106 to operate with a reduced gate drive down
to 4.5 V. Gate drive voltage and strength are programmable
to help reduce EMC issues. A bootstrap capacitor is used
to provide the above-battery supply voltage required for
N-channel MOSFETs with a VCP charge pump facilitating
high side gate drive switching at any PWM duty cycle up to
and including 100%.
Full control is provided over all six power MOSFETs in the
3-phase bridge, allowing motors to be driven with block
commutation or sinusoidal excitation. The power MOSFETs are
protected from shoot-through by integrated crossover control
and optional programmable dead time.
Integrated diagnostics provide indication of multiple internal
faults, system faults, and power bridge faults, and can be
configured to protect the power MOSFETs under most shortcircuit
conditions. For safety-critical systems, the integrated
diagnostic operation can be verified under control of the serial
interface.
The serial interface is provided to alter programmable settings
and read back detailed diagnostic information.
The AMT49106 is supplied in a 48-pin QFP package (suffix JP)
with exposed thermal pad. The package is lead (Pb) free with
100% matte-tin leadframe plating.