The MLX90418 is a 1-coil BLDC fan driver designed for server market. It represents a highly effective 1-coil solution that reduces Bill of Material (BoM) costs compared to existing three-phase BLDC fans.

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Top features

  • Sensorless 1-coil NoHall technology

  • Open and closed-loop speed control

    • Up to 40k m-RPM (for 2 pole-pair motors)

    • ±1.5 % closed-loop speed accuracy

    • Soft-switching

    • Lead angle control

  • Configurable motor start & stop options

    • Forward windmilling

    • Reverse windmilling

    • (Universal windmilling)

  • Integrated bridge driver

    • 135 mOhm (HS+LS)

    • Programmable current limit up to 4.0 A

    • 8.0 A braking current

    • Integrated supply clamp

  • Operating range

    • Supply voltage range from 6.7 V to 18 V

    • Junction temperature from -40 °C to 150 °C

  • Extensive programmability (MTP)

    • Sleep mode option

    • 8-point configurable speed curves

    • Synthesized FG output for easy retrofitting of legacy 3-phase solutions

  • Protections & Diagnostics

    • LRP / UVP / OCP / TSD

    • Hot unplug handling with power loss brake option

    • AC-power loss management

  • Package RoHS compliant

    • DFN10 3.5x3 mm2 with exposed pad

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Single-coil 12V high-speed code-free fan driver - MLX90418

Product description

The MLX90418 is 1-coil BLDC motor driver IC. It can be configured for a wide range of applications and supports replacing legacy sensorless 3-phase motors. Furthermore, it includes dedicated features for high-speed server fan applications. With the MLX90418, 1-coil solutions are extended up to 30 W in 4 cm and 6 cm server fans.

The device drives 12 V 1-coil motors, without the need for an external TVS for protection. It integrates two half bridges with very low RDSon, supporting 8 A braking current and a programmable current limit up to 4 A.

The MLX90418 is controlled via a PWM input, and provides speed feedback through a programmable FG output. Extensive speed curve fitting is available with 8 configuration points, up to 40k m-RPM (for 2 pole-pair motors).

The non-volatile memory can be programmed through I2C and is “Multiple Times Programmable”. The IC features a wide range of protections, including: “Locked Rotor Protection”, “Under Voltage Protection” with hot unplug handling, “Thermal Shut Down” and “Over Current Protection”.

The code-free plug-and-play functionality, avoids the need for software validation of MCU-based solutions, freeing up key engineering resources for realizing more projects in less time, and enabling faster production ramp-up.

In order to support new developments a FandriverEVB2 (device control & programming) and a FandriverProgrammerB (multiple device programming) are available. Additionally, a motor parameter extraction tool is available for fast validation

Application Examples

  • High-speed server cooling fans
  • General 12V fans & pumps up to 30W

Easy 1-coil motor driver for high-speed fans - MLX90418

Features and benefits

  • Sensorless 1-coil NoHall technology

  • Open and closed-loop speed control

    • Up to 40k m-RPM (for 2 pole-pair motors)

    • ±1.5 % closed-loop speed accuracy

    • Soft-switching

    • Lead angle control

  • Configurable motor start & stop options

    • Forward windmilling

    • Reverse windmilling

    • (Universal windmilling)

  • Integrated bridge driver

    • 135 mOhm (HS+LS)

    • Programmable current limit up to 4.0 A

    • 8.0 A braking current

    • Integrated supply clamp

  • Operating range

    • Supply voltage range from 6.7 V to 18 V

    • Junction temperature from -40 °C to 150 °C

  • Extensive programmability (MTP)

    • Sleep mode option

    • 8-point configurable speed curves

    • Synthesized FG output for easy retrofitting of legacy 3-phase solutions

  • Protections & Diagnostics

    • LRP / UVP / OCP / TSD

    • Hot unplug handling with power loss brake option

    • AC-power loss management

  • Package RoHS compliant

    • DFN10 3.5x3 mm2 with exposed pad

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All-in-one single-coil sensorless BLDC driver IC

Product

Discover Melexis NoHall series, our sensorless single-coil BLDC drivers specifically designed for motor, fan and pump applications across both consumer electronics and industrial domains.