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Date: 24-08-14

FET pre-driver IC for high current DC motors in cars

Automotive and industrial semiconductor vendor Melexis has made available MLX83100 N-FET pre-driver IC for high current DC motors in automotives. The 28-pin IC with four digital inputs can drive DC motors used in window lift and sunroof opening/closing mechanisms, as well as seat adjustment systems and HVAC blowers.

MLX83100 can also be used in non-automotive applications such as automatic sliding doors, mobility scooters/wheel chairs, garage door openers, fork lifts, dental chairs and hospital beds.

The MLX83100 can simultaneously drive four 500nC-rated N-FETs at up to 28V operating voltage with minimal self-heating.

The other features as explained by Melexis includes:

The device supports 45V automotive load dump conditions. An integrated bootstrap function and charge pump allow for support of supply voltages down to 4.5V, ensuring continuous operation under automotive crank conditions. The device thereby supports 100% pulse width modulated (PWM) operation. Its built-in EEPROM memory provides end-of-line (EoL) configurability, so that the customer can configure the device to their specific system design requirements. The MLX83100 also comprises a current shunt amplifier, with a high gain bandwidth, delivering a fast settling time with high accuracy. This makes these pre-drivers highly suitable for precise torque control applications, like electrical power steering.

The MLX83100 is fully automotive qualified and has an operational temperature range spanning from -40°C to +150°C. Full diagnostics is provided via a single serial communication line, thereby distinguishing different error types. All output voltages are for example monitored for failure conditions. In addition, input battery under-voltage, over-voltage and over-temperature protection is incorporated.

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