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Automotive high power 3-phase brushless BLDC B6 pre-driver

MLX83203

The MLX83202 and MLX83203 are three-phase pre-drivers (also called bridge driver or gate driver) IC with integrated current sense amplifier. The devices are used to drive brushless DC motors in combination with a microcontroller and six discrete power N-FETs. For high-power applications, the MLX83203 provides a gate drive strength of 1A. For low to medium power applications the MLX83202 is well suited with a gate drive strength of 300 mA typical.

The pre-drivers are able to drive six external N-FETs in the supply range from 4.5 volt to 28 volt by means of the integrated charge pump. The high-side gate drivers are supplied via bootstrap circuits. A trickle charge pump allows 100% pulse width modulation (PWM) operation despite the use of bootstrap capacitors. The bootstrap voltage regulator is optimized for gate charges up to 350 nC per FET at 20 kHz PWM.

The MLX83203 and MLX83202 comprise 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 MLX83203 and MLX83202 provide 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

  • Optional charge pump for low supply voltage operation

  • Alternative charge pump configuration provides NFET reverse polarity drive

  • Compatible with 3 V and 5 V microcontrollers

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

  • High side NFET driver with bootstraps and trickle charge pump for 100% PWM operation

  • Low offset, low drift, fast current sense amplifier

  • Fault interrupt and feedback to microcontroller

  • Under and overvoltage protection

  • Overtemperature protection

  • VDS and VGS external FET monitoring

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

  • Extensive configurability in EEPROM: Programmable dead time: 0 to 6us, programmable gain: 8 to 48, hardware protection settings (auto-shutdown), diagnostics settings (VDS level, masking time, ...), charge pump configuration

  • Automotive qualified: Wide supply voltage operating range: [4.5, 28]V, 45V load dump, 2000Hrs HTOL 150C, Sleep mode with low quiescent current (<30uA)

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Automotive high power 3-phase brushless BLDC B6 pre-driver - MLX83203

Features and benefits

  • Optional charge pump for low supply voltage operation

  • Alternative charge pump configuration provides NFET reverse polarity drive

  • Compatible with 3 V and 5 V microcontrollers

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

  • High side NFET driver with bootstraps and trickle charge pump for 100% PWM operation

  • Low offset, low drift, fast current sense amplifier

  • Fault interrupt and feedback to microcontroller

  • Under and overvoltage protection

  • Overtemperature protection

  • VDS and VGS external FET monitoring

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

  • Extensive configurability in EEPROM: Programmable dead time: 0 to 6us, programmable gain: 8 to 48, hardware protection settings (auto-shutdown), diagnostics settings (VDS level, masking time, ...), charge pump configuration

  • Automotive qualified: Wide supply voltage operating range: [4.5, 28]V, 45V load dump, 2000Hrs HTOL 150C, Sleep mode with low quiescent current (<30uA)

Used in these

Industries

  • Automotive - Transmission
  • Automotive - Powertrain
  • Automotive - Hybrid & Electric Powertrain
  • Automotive - Chassis & Safety
  • Industrial & Robotics
  • Non-Automotive Transportation

Inspired Engineering

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