MAX31740

RECOMMENDED FOR NEW DESIGNS

Ultra-Simple Fan-Speed Controller

Enables Simple Implementation of Customizable Fan Control with No Software Development or MCU Required

Data Sheet (Rev. 3) Product Selection Table

Part Models: 4
1ku List Price: Starting From $0.59

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Overview

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
AEC-Q100 qualified MAX31740ATA/VY+

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-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.

The MAX31740 is available in a 2mm x 3mm, 8-pin TDFN package.

Applications

Communications Equipment
Computing Equipment
Consumer Equipment
Industrial Equipment

Part Models: 4
1ku List Price: Starting From $0.59

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX31740ATA+	8-LFCSP-2X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX31740ATA+T	8-LFCSP-2X3X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX31740ATA/VY+	8-LFCSP_SS-2X2X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX31740ATA/VY+T	8-LFCSP_SS-2X2X0.75	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys