MAX31760

Precision Fan-Speed Controller with Nonvolatile Lookup Table

Customizable Lookup Table-Based Fan Controller Enables Smooth Control of Fan Speed to Reduce Acoustic Noise


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Description

The MAX31760 integrates temperature sensing along with precision PWM fan control. It accurately measures its local die temperature and the remote temperature of a discrete diode-connected transistor, such as a 2N3906, or a thermal diode commonly found on CPUs, graphics processor units (GPUs), and other ASICs. Multiple temperature thresholds, such as local high/overtemperature (OT) and remote high/overtemperature, can be set by an I2C-compatible interface.

Fan speed is controlled based on the temperature reading as an index to a 48-byte lookup table (LUT) containing user-programmed PWM values. The flexible LUT-based architecture enables the user to program a smooth nonlinear fan speed vs. temperature transfer function to minimize acoustic fan noise. Two tachometer inputs allow measuring the speeds of two fans independently. The active-low FF/FS pin multiplexes an open-drain fan-failure output with a full-speed fan-drive input. When the local or remote OT threshold is exceeded, the active-low SHDN pin is asserted low and can be used to shut down the system. A dedicated active-low ALERT pin reports that either a local or remote high-temperature threshold has been exceeded. Active-low ALERT can be programmed to work in either fault indicator mode or interrupt mode. These features make the device a compact and complete solution for a single-fan or two-fan cooling system. 

MAX31760: Typical Application Circuit MAX31760: Typical Application Circuit Enlarge+

Key Features

  • Customizable 48-Byte Lookup Table (LUT)-Based Architecture Enables a Smooth Nonlinear Control Output that Reduces Acoustic Noise
  • Operating Settings Stored in Nonvolatile Memory for Automatic Operation at Power-On
  • Two Tachometer Inputs Provide Flexibility by Measuring the Speeds of Two Fans Independently
  • Accurately Senses Both Remote and Local Temperature, Allowing Multiple Temperature Thresholds to Be Set

Applications/Uses

  • NAS/DAS
  • Networking Equipment
  • Servers
  • STB/DVR

See parametric specs for Fan Controllers (20)


Part NumberSensor TypeFan Controller FunctionsFan Cntrl.InterfaceAccuracy
(±°C)
Temp. Thresh.
(°C)
Temp. Resolution
(bits)
Package/PinsBudgetary
Price
See Notes
MAX31760 Remote
Fan Failure Detector
Remote & Local Sensor
PWM2-Wire/I2C/SMBus2Programmable11
QSOP/16
$1.16 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX31760EVKIT: Evaluation Kit for the MAX31760

Tools & Models

  • MAX31760 IBIS Model
  • MAX31760
  • Product Reliability Reports: MAX31760.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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