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Two-coil fan driver - high output current (tachometer output)

US890

The US890 is a one-chip solution for driving two-coil brushless DC motors and fans.

Based on the advanced Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and powerful output drivers with 1.200 mA peak output current capability.

Specially designed for driving large fans, the device is optimized for low startup voltage.

The frequency generator (FG) open-drain output makes easier the connectivity with any external interface such as hardware monitoring or super I/O IC. These features are combined with the Melexis patented no-VDD design to fit the IC in a small 4-pin VK package.

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Top features

  • Peak output current up to 1.200 mA

  • Low startup voltage

  • Low output resistance

  • High sensitivity integrated Hall sensor

  • Power-efficient CMOS and power MOSFETs

  • Built-in output protection clamping diode

  • Locked rotor protection and auto-restart

  • Integrated tachometer signal protected output

  • Low cost

  • 2-coil fan driver with FG output in

  • RoHS compliant 4-pin VK package
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Two-coil fan driver - high output current (tachometer output) - US890

Features and benefits

  • Peak output current up to 1.200 mA

  • Low startup voltage

  • Low output resistance

  • High sensitivity integrated Hall sensor

  • Power-efficient CMOS and power MOSFETs

  • Built-in output protection clamping diode

  • Locked rotor protection and auto-restart

  • Integrated tachometer signal protected output

  • Low cost

  • 2-coil fan driver with FG output in

  • RoHS compliant 4-pin VK package

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