Low noise fandriver for automotive applications

September 13, 2018 // By Ally Winning
Melexis has launched a single coil fan driver IC that can deliver 600mA at 24V, or 15W and combines high performance with low noise operation.

The MLX90411 operates from an input supply from 3V to 28V. In automotive applications, the device can be directly connected to the battery without further protection due to its ability to withstand load dump pulses up to 40V. The ASIL-ready fandriver can operate over a temperature range of -40°C to +150°C.

Multiple commutation options are available, encompassing both low EMI and low acoustic noise. An adaptive control algorithm ensures maximum torque and the lowest reverse current across all operating conditions. Both open loop and closed loop control is possible, with a wide range of dynamic (PI) settings, for a speed range up to 45,000 electrical RPM.

The MLX90411 features protection for locked rotors, over temperature, overvoltage, short circuit and current limiting, meeting stringent automotive requirements.

The device is programmable via an I2C interface and all options are configurable in the on-board EEPROM. Based upon 0.18μm technology, the tiny MLX90411 is available in a straight-lead SOT package and a 2.5mm x 2.0mm x 0.4mm UTDFN package.

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