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Maxim rolls out fan-failure detector/driver IC

Posted: 18 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? maxim? fan failure detector? fan driver? failure detector?

The MAX6684 fan-failure detector/driver senses a fan's supply current to indicate functionality, eliminating the need for a tachometer output on the fan.

The 8-pin SOP device drives 5V, 12V and 24V fans rated up to 250mA (nominal). It detects fan failures such as underspeed stalling and locked rotors in common brushless dc fans.

The device is inserted in series with the low side of the fan and senses the fan current. Static fan current is interpreted by the device to indicate fan failure. Failure is reported to the system through an active-low open-drain output.

An on/off-bar pin allows a microcontroller to turn the fan on or off. This feature enables the device to be used as an output power switch for PWM fan controllers.

The MAX6684 operates with a 3V to 5.5V supply voltage while connected to fans up to 24V. Standby current is placed at 10?A (max.), while supply current is 3.4mA (max.) when the fan current is 300mA. It has an operating temperature range of -40C to 85C.

The MAX6684 is priced starting at 99 cents for quantities of 1,000 and up.

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