A4918KJPTR-5-T | Motor Control ICs

Automotive Three-Phase MOSFET Driver, A4918KJPTR-5-T, Allegro

The A4918 is an N-channel power MOSFET driver capable of controlling a MOSFET connected in a 3-phase bridge arrangement and is specifically designed for automotive applications with a high-power inductive load, such as a BLDC motor. A unique charge pump regulator provides the supply for the MOSFET gate drive for battery voltages down to 7 V and allows the A4918 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 an N-channel MOSFET, with an additional above-battery charge pump to ensure that the bootstrap capacitor remains charged when held in the on state.

Full control is provided over all six power MOSFETs in the 3-phase bridge, allowing a motor to be driven with block commutation or sinusoidal excitation. The power MOSFET is 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 MOSFET under most short-circuit conditions.

Features

• Bootstrap gate drive for N-channel MOSFET bridge
• Cross-conduction protection with adjustable dead time
• Charge pump for low supply voltage operation
• Programmable gate drive voltage and strength
• Integrated logic supply
• Three programmable current sense amplifiers
• Extensive programmable diagnostics
• Diagnostic verification