Trade Shows

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26.06. - 28.06.2018, Nuremberg
Hall 5, Booth 5-401




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Germany / General
André Huntrieser
✆: +49 (0) 2129 - 376-202
✉: Send email
Field Applications Engineer
Günter Fuchs
✆: +49 (0) 2129 376-200
✉: Send email
Tech Support
Raphael Balke
✆: +49 (0) 2129 376-200
✉: Send email

Austria / Switzerland
Karl Eder
✆: +43 (0) 7448 - 21643-11
✉: Send email





The US91 is a one-chip solution for driving two-coil brushless DC fans. Based on advanced Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.
The output drivers OUT1 and OUT2 are fully protected against switching transients. So there is no need for an external Zener-diode to cut the high voltage spikes induced by the fan coils. The integrated alarm (RD) output is a safety signal which allows detecting if the fan rotates or not.
These features are combined with the Melexis patented no-VDD design to fit the IC in a small 4-pin through-hole package (TO92).




Features Application examples
  • 2-coil fan driver
  • On-chip solution with Hall-element and output drivers
  • High sensitivity integrated Hall sensor
  • Alarm signal (RD) protected output
  • Locked rotor protection and auto-restart
  • Power-efficient CMOS and power MOSFETs
  • Built-in output protection clamping diode
  • Temperature range from -40°C to 85°C (Code E)
  • Low supply voltage from 4.7V to 30V
  • Low output resistance
  • Output currents:
    • 500mA Peak
    • 250mA Continuous
  • TO92-4L package (VK package)
  • 5V / 12V 2-Coil brushless DC motor / fan
  • Automotive applications
  • Industrial and Robotics
  • Home & Office Automation
  • Building& Security Automation
  • Consumer solutions
  • White Goods & Household Appliances

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