Single-coil fan driver - Low noise and low voltage (alarm output)

US169

The US169 is a one-chip solution for driving single-coil brushless DC (BLDC) fans and motors.

The use of Melexis soft switching concept lowers the acoustic and electrical motor noise and provides smoother operation.

The US169 device includes reverse voltage protection, locked rotor protection and thermal protection. Therefore, the IC robustness perfectly suits for consumer and automotive-on-board applications.

The integrated alarm (RD) output is a safety signal which allow to detect if the fan rotates or not. Its open-drain output facilitates the connectivity with external interface for hardware monitoring.

Delivered in the well-known thin SOT-23 package, it is quite suitable for low noise 5 volt single-coil cooling fans without need of any external components.

The device is also provided in a chip scale package (CSP) which is the smallest packaged IC configuration available. The CSP saves valuable PCB and housing space allowing smaller integration. The footprint of the new Ultra-Thin QFN (Quad Flat No leads) package is only 3mm2 (1.5 x 2 mm) with 0.43 mm maximum thickness.

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Top features

  • Soft switching for low noise

  • Low supply voltage: 1.8 to 6.5V

  • Full bridge driver

  • High sensitivity integrated Hall sensor

  • Low power consumption

  • Reverse voltage protection

  • Locked rotor protection and auto-restart

  • Thermal protection and auto-restart

  • No external components needed

  • Alarm output signal (RD)

  • Thin SOT23-5L RoHS compliant package

  • Ultra thin (0.4mm) leadless UTQFN-6L RoHS compliant package
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Single-coil fan driver - Low noise and low voltage (alarm output) - US169

Features and benefits

  • Soft switching for low noise

  • Low supply voltage: 1.8 to 6.5V

  • Full bridge driver

  • High sensitivity integrated Hall sensor

  • Low power consumption

  • Reverse voltage protection

  • Locked rotor protection and auto-restart

  • Thermal protection and auto-restart

  • No external components needed

  • Alarm output signal (RD)

  • Thin SOT23-5L RoHS compliant package

  • Ultra thin (0.4mm) leadless UTQFN-6L RoHS compliant package

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