MAX31740ATA+T

MAX31740ATA+T 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-duty cycle 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. Applications include consumer equipment, communications equipment, computing equipment, and industrial equipment.

• Self-contained PWM fan control-no micro needed
• Resistors set fan control characteristics
• Smooth, linearly varying PWM duty cycle minimizes audibility of fan noise
• Accurately monitors external thermistor temperature
• 3.0V to 5.5V operating voltage range
• AEC-Q100 qualified
• Supply current is 500µA typ at VDD=3.3V
• Input bias current is 19nA typ at TA=+25°C to +125°C
• Temperature rating range from -40°C to +125°C
• 8 TDFN-EP package

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