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.