Datasheet4U Logo Datasheet4U.com

MAX31740 - Ultra-Simple Fan-Speed Controller

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.

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.

📥 Download Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
MAX317 Precision / CMOS Analog Switches Maxim
MAX3170 +3.3V / Multiprotocol / 3 Tx/3 Rx / Software- Selectable Clock/Data Transceiver Maxim
MAX3171 +3.3V Multiprotocol 3Tx/3Rx Software-Selectable Control Transceivers Maxim
MAX3172 +3.3V Multiprotocol Software-Selectable Cable Terminators/Transceivers Maxim
MAX31732 Four-Channel Remote Temperature Sensor Analog Devices

Other Datasheets by 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

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
Click here for production status of specific part numbers. MAX31740 Ultra-Simple Fan-Speed Controller 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. Controllable characteristics include the starting temperature for fan control, PWM frequency, fan speed at low temperatures, and slope of the temperature-dutycycle transfer function.