The Melexis MLX90287 is a one-chip solution designed in mixed signal CMOS technology for driving single-coil brushless DC motors like PWM cooling fans.
The device provides a fully integrated, robust and high performance Hall effect based fan driver IC, with the ability to control cooling fan speed using PWM or analog signals.
The MLX90287 features a one-chip solution for driving low noise speed-controlled single-coil brushless cooling fans. With an operating supply voltage from 4.5 V to 18 V, the MLX90287 targets the widely used “12 volt” cooling fan applications. With the integrated power stage, cooling fans rated as high as 550 mA (continuous) can be easily driven addressing a majority of applications.
The MLX90287 provides a simple solution for controlling cooling fan speed via digital or analog techniques. It directly accepts, without any external circuitry, a wide PWM frequency range from 100 Hz to 100 KHz.
The Intelligent Soft Start prevents very high peak current during start-up. An additional system guarantees proper motor start-up even with low PWM input duty cycle, ensuring enough initial torque to the motor is generated to enable rotation. When motor rotation is detected the output duty cycle is adjusted linearly to the input duty cycle.
Directly PWM compatible with Intel’s PWM fan specification, analog and temperature speed control regulation available in one and the same device.