Features and Benefits

  • Integrated Thermal Sensing and Fan-Regulation Solution
  • Programmable Fan Threshold Temperature
  • Programmable Temperature Range for Full-Scale Fan Speed
  • Accurate Closed-Loop Fan-Speed Regulation
  • On-Chip Power Device Drives Fans Rated Up to 250mA
  • Programmable Under/Overtemperature Alarms
  • SMBus 2-Wire Serial Interface with Timeout (Cannot "Lock Up" the SMBus)
  • Supports SMBus Alert Response
  • ACPI Compatible, Including OVERT-bar System Shutdown Function
  • ±1°C (+60°C to +100°C) Thermal-Sensing Accuracy
  • MAX6660EVKIT Available

Product Details

The MAX6660 is a remote temperature sensor and fan-speed regulator that provides a complete fan-control solution. The remote temperature sensor is typically a common-collector PNP, such as a substrate PNP of a microprocessor, or a diode-connected transistor, typically a low-cost, easily mounted 2N3904 NPN type or 2N3906 PNP type.

The device also incorporates a closed-loop fan controller that regulates fan speed with tachometer feedback. The MAX6660 compares temperature data to a fan threshold temperature and gain setting, both programmed over the SMBus by the user. The result is automatic fan control that is proportional to the remote-junction temperature. The temperature feedback loop can be broken at any time for system control over the speed of the fan.

Fan speed is voltage controlled as opposed to PWM controlled, greatly reducing acoustic noise and maximizing fan reliability. An on-chip power device drives fans rated up to 250mA.

Temperature data is updated every 0.25s and is readable at any time over the SMBus interface. The MAX6660 is accurate to 1°C (max) when the remote junction is between +60°C to +100°C. Data is formatted as a 10-bit + sign word with 0.125°C resolution.

The MAX6660 is specified for -40°C to +125°C and is available in a 16-pin QSOP package.


  • Industrial Control Systems
  • Notebook Computers
  • PC
  • Servers
  • Telecom Systems
  • Workstations

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Design Resources

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.

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Buy Now Pricing

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List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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