MAX31740ATA+

The MAX31740ATA+ is an ultra-simple fan-speed controller in 8 pin TDFN package. The MAX31740 is a sophisticated, yet easy to use fan speed controller. It monitors the temperature of an external NTC thermistor and generates a PWM signal that can be used to control the speed of a 2, 3 or 4 wire fan. The fan control characteristics are set using external resistors, thereby eliminating the need for an external microcontroller. Controllable characteristics include the starting temperature for fan control, PWM frequency, fan speed at low temperatures and slope of the temperature-dutycycle transfer function. Because the operating characteristics are selected by hardwired passive components, a simple, low-cost fan speed controller can be implemented without the need for firmware development. This can dramatically reduce development time for the fan control function.

• Supply voltage range is 3V to 5.5V
• Operating temperature range from -40°C to 125°C
• Self contained PWM fan control
• Resistors set fan control characteristics
• Smooth, linearly varying PWM duty cycle minimizes audibility of fan noise
• Accurately monitors external thermistor temperature

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Consumer Electronics, Industrial

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