MAX6643

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
4
1ku List Price
Starting From $1.71
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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
MAX6643
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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Evaluation Kits

MAX6643LBEVKIT

Evaluation Kit for the MAX6643/MAX6644

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Features and Benefits

  • Automatic Fan-Speed Control
  • Local and Remote Temperature Sensing
  • Programmable Low, High, and Over-Temperature Thresholds
  • Minimizes Acoustic Noise
  • Fan-Failure Detection
  • Configured for 5V to 12V Fans Up to 1A
  • Reconfigurable for Up to Two Fans
  • Surface-Mount Components
  • Fully Assembled and Tested
  • Evaluates All Versions of the MAX6643 and MAX6644 (IC Replacement Required)

Product Details

The MAX6643LB evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the operation of the MAX6643LB fan controller. The MAX6643LB monitors its internal temperature and the junction temperature of an optional external diode-connected transistor. Based on the temperature measurements, the MAX6643LB generates a PWM waveform that drives the gate of an external n-channel power MOSFET, which modulates the cooling fan's power supply, thus providing automatic fan-speed control.

The high- and low-temperature fan-control thresholds are easily programmable by connecting programming pins to ground or supply or leaving them disconnected. The fan-control algorithm is optimized to minimize the audible artifacts of varying fan speeds. Fan failure is detected by monitoring the fan's tachometer output. Also provided is an over-temperature output with pin-programmable threshold.

The EV kit can also be used to evaluate other versions of the MAX6643/MAX6644 fan-controlling ICs.

Applications

  • Desktop Computers
  • Networking Equipment
  • Servers
  • Storage Equipment
  • Workstations
MAX6643LBEVKIT
Evaluation Kit for the MAX6643/MAX6644

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