MAX6645

PRODUCTION

Automatic PWM Fan-Speed Controllers with Overtemperature Output

Automatic PWM Fan-Speed Controllers with Overtemperature Output Eliminate Software Overhead

Data Sheet (Rev. 3) Product Selection Table
Part Models
1
1ku List Price
Starting From $1.85
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Part Details

  • Simple, Automatic Fan-Speed Control
  • Internal and External Temperature Sensing
  • Detect Fan Failure Through Locked-Rotor Output, Tachometer Output, or Fan-Supply Current Sensing
  • Multiple, 1.6% Output Duty-Cycle Steps for Low Audibility of Fan-Speed Changes
  • Pin-Selectable or Factory-Selectable Low-Temperature Fan Threshold
  • Pin-Selectable or Factory-Selectable High-Temperature Fan Threshold
  • Spin-Up Time Ensures Fan Start
  • Fan-Start Delay Minimizes Power-Supply Load at Power-Up
  • 32Hz PWM Output
  • Controlled Duty-Cycle Rate-of-Change Ensures Good Acoustic Performance
  • 2°C Temperature-Measurement Accuracy
  • FULLSPD/FULLSPD Input Sets PWM to 100%
  • Pin-Selectable Active-Low OT Output Threshold
  • 16-Pin QSOP and 10-Pin µMAX Packages
MAX6645
Automatic PWM Fan-Speed Controllers with Overtemperature Output
MAX6643, MAX6644, MAX6645: Block Diagram
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Documentation

Data Sheet 1

Design Note 2

Technical Articles 1

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Hardware Ecosystem

Parts Product Life Cycle Description
Fan Speed Controllers 2
MAX6650
PRODUCTION Fan-Speed Regulators and Monitors with SMBus/I²C-Compatible Interface
MAX6660
PRODUCTION Remote-Junction Temperature-Controlled Fan-Speed Regulator with SMBus Interface
Product 1
MAX6668
Remote Temperature Switches with Integrated Fan Controller/Driver
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