Fan Controller Using Just Two Components

Posted on Feb 5, 2014

The Maxim MAX 6665 ( provides a complete temperature-dependent fan controller. It can switch fans operating at voltages of up to 24 V and currents of up to 250 mA. The IC is available from the manufacturer in versions with preset threshold temperatures between +40 °C (MAX6665 ASA40) and +70 °C (MAX6665 ASA 70). The device`s hysteresis can be set

Fan Controller Using Just Two Components
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by the user via the HYST input, which can be connected to +3. 3 V, connected to ground, or left open. The following table shows the hysteresis values available:

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