Small Product Family image - Drive

The US90A is a one-chip solution for driving two-coil brushless DC cooling fans.

Based on Melexis CMOS process, the IC contains a Hall-effect sensor, dynamic offset correction and low side output drivers.

The frequency generator (FG) open-drain output makes the connectivity with any external interface easier. These features are combined with the Melexis patented no-VDD design to fit the IC in a small 4-pin VK or VA package. Also available in straight leads SOT23 and bent leads SOIC8 package.

Read more

Top features

  • Low cost

  • High sensitivity Hall sensor

  • Locked rotor protection and auto-restart

  • Power-efficient CMOS and power MOSFETs

  • Built-in output protection clamping diode

  • Integrated tachometer signal output

  • SIP- package options:  4-pin VK or VA

  • SMD package options: SOT23-5L straight leads and SOIC8 bent leads

  • Drop-in replacement of US90
Discover all features
Two-coil fan driver - high voltage (tachometer output) - US90A

Features and benefits

  • Low cost

  • High sensitivity Hall sensor

  • Locked rotor protection and auto-restart

  • Power-efficient CMOS and power MOSFETs

  • Built-in output protection clamping diode

  • Integrated tachometer signal output

  • SIP- package options:  4-pin VK or VA

  • SMD package options: SOT23-5L straight leads and SOIC8 bent leads

  • Drop-in replacement of US90

Inspired Engineering