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Automotive high and medium power 3-phase BLDC B6 pre-driver

MLX83202

The MLX83202 is a three-phase pre-driver (also called bridge driver or gate driver) IC with integrated current sense amplifier. The device is used to drive brushless DC motors in combination with a microcontroller and six discrete power N-FETs.

The MLX83202 is able to drive six external N-FETs in the supply range from 4.5 V to 28 V. The high-side gate drivers are supplied via bootstrap circuits. The bootstrap voltage regulator is optimized for gate charges up to 250 nC per FET at 20 kHz PWM.

Our MLX83202 comprises various monitoring and protection functions, including undervoltage and overvoltage detection at multiple internal voltage nodes, overtemperature detection, and drain-source and gate-source voltage monitoring of the external N-FETs. In case of fault detection, the serial ICOM diagnostics interface will inform the microcontroller with a PWM signal, whose duty cycle indicates the nature of the error.

An integrated programmable gain, current sense amplifier with high bandwidth and low offset allows for precise torque control.

The MLX83202 provides an EEPROM for configurability, avoiding the need for a high pin-count package. The configuration allows the customer to optimize the pre-driver operation for different applications.

For DC applications the MLX83100 pre-driver is available. For sensorless BLDC applications see also our MLX812xx embedded-MCU BLDC controllers family.

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Top features

  • Converts 3 or 6 PWM inputs from a microcontroller to drive 6 external N-FETs

  • 1 A gate drive (MLX83203) and 300 mA gate drive (MLX83202)

  • Optional charge pump for low supply voltage operation

  • Charge pump configuration provides N-FET reverse polarity drive

  • Compatible with 3 V and 5 V microcontroller IO

  • Low offset, low drift, high bandwidth current sense amplifier

  • Fault interrupt and feedback to microcontroller

  • Under and overvoltage protection

  • Overtemperature protection

  • External FET drain-source VDS and gate-source VGS voltage monitoring

  • Extensive configurability in EEPROM:

    • Programmable dead time: 0 to 6us

    • Programmable current sense amplifier gain: 8 to 48

    • Hardware protection settings (auto-shutdown)

    • Diagnostics settings (VDS level, masking time, ...)

    • Charge pump configuration

  • Automotive qualified:

    • AEC-Q100 grade 1 qualification (TJ=150˚C)

    • Wide supply voltage operating range: [4.5, 28]V

    • 45V load dump

    • Sleep mode with low quiescent current (<30uA)

  • Very small footprint: QFN32 5x5mm (25mm2)
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Automotive high and medium power 3-phase BLDC B6 pre-driver - MLX83202

Features and benefits

  • Converts 3 or 6 PWM inputs from a microcontroller to drive 6 external N-FETs

  • 1 A gate drive (MLX83203) and 300 mA gate drive (MLX83202)

  • Optional charge pump for low supply voltage operation

  • Charge pump configuration provides N-FET reverse polarity drive

  • Compatible with 3 V and 5 V microcontroller IO

  • Low offset, low drift, high bandwidth current sense amplifier

  • Fault interrupt and feedback to microcontroller

  • Under and overvoltage protection

  • Overtemperature protection

  • External FET drain-source VDS and gate-source VGS voltage monitoring

  • Extensive configurability in EEPROM:

    • Programmable dead time: 0 to 6us

    • Programmable current sense amplifier gain: 8 to 48

    • Hardware protection settings (auto-shutdown)

    • Diagnostics settings (VDS level, masking time, ...)

    • Charge pump configuration

  • Automotive qualified:

    • AEC-Q100 grade 1 qualification (TJ=150˚C)

    • Wide supply voltage operating range: [4.5, 28]V

    • 45V load dump

    • Sleep mode with low quiescent current (<30uA)

  • Very small footprint: QFN32 5x5mm (25mm2)

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