MAX31790

6-Channel PWM-Output Fan RPM Controller

Versatile Fan RPM Controller Can Be Configured for Closed-Loop Control for Up to 6 Fans or Monitoring for Up to 12 Fans


Please check latest availability status for a specific part variant.

Description

The MAX31790 controls the speeds of up to six fans using six independent PWM outputs. The desired fan speeds (or PWM duty cycles) are written through the I²C interface. The outputs drive "4-wire" fans directly, or can be used to modulate the fan's power terminals using an external pass transistor.

Tachometer inputs monitor fan tachometer logic outputs for precise (±1%) monitoring and control of fan RPM as well as detection of fan failure. Six pins are dedicated tachometer inputs. Any of the six PWM outputs can also be configured to serve as tachometer inputs.

The PWM_START inputs select the PWM output status at startup to ensure appropriate fan drive when power is first applied.

To ensure low acoustic impact of fan control, all changes in PWM duty cycle take place at a controlled, programmable rate.

The MAX31790's 3.0V to 5.5V supply voltage range and I²C-compatible interface make it ideal for fan control in a wide range of cooling applications. The MAX31790 is available in a 28-pin TQFN package and operates over the -40°C to +125°C temperature range.
MAX31790: Typical Operating Circuit MAX31790: Typical Operating Circuit Enlarge+

Key Features

  • Provides Precise Fan Control and Monitoring for Large Fan Count Applications
    • Controls Up to Six Independent Fans with PWM Drive
    • Up to 12 Tachometer Inputs
    • Controlled Duty Cycle Rate-of-Change for Best Acoustics
  • Improves System Reliability
    • Versatile Startup Configurations Provide Reliable Fan Control at Power-up without Having to Wait for System µC Direction
    • I2C Bus Interface with Timeout and Watchdog

Applications/Uses

  • Networking
  • Servers
  • Telecom
Part NumberFan Controller FunctionsFan Cntrl.InterfacePackage/PinsBudgetary
Price
See Notes
MAX31790 Fan Failure DetectorPWM2-Wire/I2C/SMBus
TQFN/28
$2.70 @1k
See All Fan Controllers (21)
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.


MAX31790EVKIT: Evaluation Kit for the MAX31790

Quality and Environmental Data

Product Reliability Reports: MAX31790.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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:
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