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

• SPI-compatible serial interface

• Bridge control by direct logic inputs or serial interface

• Q&A and ENABLE watchdog

• Extensive programmable diagnostics

• Diagnostic verification

• Safety-assist features

• Automotive AEC-Q100 qualified

• A2-SIL™ product—device features for

safety-critical systems*

DESCRIPTION

The AMT49107 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 AMT49107 to operate with a reduced gate

drive down to 4.5 V. Gate drive strength is 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 AMT49107 is supplied in a 48-pin wettable flank QFN

package (suffix EV) with exposed thermal pad. The package

is lead (Pb) free with 100 matte-tin leadframe plating.