Pre-driver chip targets automotive high-current motor applications

August 19, 2014 // By Christoph Hammerschmidt
The MLX83100 from Melexis is an N-FET pre-driver IC with low pin-count package (28 pins) and four digital inputs that provides a space-saving solution for high-current DC motors in automotive enviroments.

Though BLDC motors are now becoming increasingly commonplace, DC motors are still more cost effective in a broad spectrum of application areas, especially where the motor is not continuously running.

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