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MAX31740 Datasheet Ultra-Simple Fan-Speed Controller

Manufacturer: Maxim Integrated (now Analog Devices)

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General Description

The MAX31740 is a sophisticated, yet easy-to-use fanspeed 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.

Overview

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MAX31740 Ultra-Simple Fan-Speed Controller.

Key Features

  • Self-Contained PWM Fan Control.
  • No Micro Needed.
  • Controls Speed of 2-, 3-, or 4-Wire Fans.
  • 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.
  • -40°C to +125°C Operating Temperature Range.

More Datasheets from Maxim Integrated (now Analog Devices)

Part Number Description
MAX3174 +3.3V Multiprotocol Software-Selectable Cable Terminators/Transceivers
MAX31722 Digital Thermometers and Thermostats
MAX31723 Digital Thermometers and Thermostats
MAX31725 Local Temperature Sensors
MAX31726 Local Temperature Sensors
MAX3173 +3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers
MAX31730 3-Channel Remote Temperature Sensor
MAX31790 6-Channel PWM-Output Fan RPM Controller
MAX3109 Dual Serial UART
MAX31341B Real-Time Clock