MAX6639
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MAX6639

2-Channel Temperature Monitor with Dual, Automatic, PWM Fan-Speed Controller

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High-Frequency, Dual Temperature Sensor and Fan Controller with Selectable Address and Closed-Loop Operation

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 7
1ku List Price Starting From $2.09
Features
  • Two Thermal-Diode Inputs
  • Up to 25kHz PWM Output Frequency
  • Three Selectable SMBus Addresses
  • Local Temperature Sensor
  • 1°C Remote Temperature Accuracy
  • Two PWM Outputs for Fan Drive (Open Drain; Can be Pulled Up to +13.5V)
  • Programmable Fan-Control Characteristics
  • Automatic Fan Spin-Up Ensures Fan Start
  • Controlled Rate-of-Change Ensures Unobtrusive Fan-Speed Adjustments
  • ±3% Fan-Speed Measurement Accuracy
  • Temperature Monitoring Begins at POR for Fail-Safe System Protection
  • Active-Low OT and Active-Low THERM Outputs for Throttling or Shutdown
  • Measures Temperatures Up to +150°C
  • MAX6639F is Optimized for n = 1.021 for Penryn Compatibility
Additional Details
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The MAX6639 monitors its own temperature and one external diode-connected transistor or the temperatures of two external diode-connected transistors, typically available in CPUs, FPGAs, or GPUs. The 2-wire serial interface accepts standard System Management Bus (SMBus) write byte, read byte, send byte, and receive byte commands to read the temperature data and program the alarm thresholds. Temperature data can be read at any time over the SMBus, and three programmable alarm outputs can be used to generate interrupts, throttle signals, or overtemperature shutdown signals.

The temperature data is also used by the internal dual-PWM fan-speed controller to adjust the speed of up to two cooling fans, thereby minimizing noise when the system is running cool, but providing maximum cooling when power dissipation increases. Speed control is accomplished by tachometer feedback from the fan, so that the speed of the fan is controlled, not just the PWM duty cycle. Accuracy of speed measurement is ±4%.

The MAX6639 is available in 16-pin QSOP and 16-pin thin QFN 5mm x 5mm packages. It operates from 3.0V to 3.6V and consumes just 500µA of supply current.

Applications

  • Desktop Computers
  • Networking Equipment
  • Notebook Computers
  • Projectors
  • Servers
Part Models 7
1ku List Price Starting From $2.09

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX6639AEE+
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MAX6639AEE+T
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MAX6639ATE+
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MAX6639ATE+T
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MAX6639FAEE+
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MAX6639FAEE+T
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MAX6639FATE+
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Part Models

Product Lifecycle

PCN

Jan 16, 2019

- 1746A

ASSEMBLY

MAX6639AEE+

PRODUCTION

MAX6639AEE+T

PRODUCTION

Jun 20, 2016

- 1612

ASSEMBLY

MAX6639ATE+

PRODUCTION

MAX6639ATE+T

PRODUCTION

MAX6639FATE+

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jan 16, 2019

- 1746A

arrow down

ASSEMBLY

MAX6639AEE+

PRODUCTION

MAX6639AEE+T

PRODUCTION

Jun 20, 2016

- 1612

arrow down

ASSEMBLY

MAX6639ATE+

PRODUCTION

MAX6639ATE+T

PRODUCTION

MAX6639FATE+

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX6639EVKIT

Evaluation Kit for the MAX6639 and MAX6639F

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MAX6639EVKIT

Evaluation Kit for the MAX6639 and MAX6639F

Evaluation Kit for the MAX6639 and MAX6639F

Features and Benefits

  • Two Thermal-Diode Inputs
  • Local Temperature Sensor
  • Programmable Temperature Alarms
  • Two PWM Outputs for Fan Drive
  • Up to 25kHz PWM Output Frequency
  • Programmable Fan-Control Characteristics
  • 3-Wire and 4-Wire Fan Configurations
  • On-Board Microcontroller to Generate SMBus™ /I²C Commands
  • USB-PC Connection (Cable Included)
  • Windows 2000/XP- and Windows Vista (32-Bit)-Compatible Software
  • Easy-to-Use, Menu-Driven Software
  • Lead(Pb)-Free and RoHS Compliant
  • Fully Assembled and Tested

Product Detail

The MAX6639 evaluation kit (EV kit) is an assembled and tested PCB used to evaluate the MAX6639 dual temperature sensor/fan controller. The MAX6639 monitors its own die temperature and the junction temperature of one external diode-connected transistor, or the junction temperatures of two external diode-connected transistors. It converts the temperature to 8-bit or 11-bit 2-wire serial data that can be accessed over a 2-wire serial bus.

The MAX6639 EV kit includes both external diode-connected transistors (2N3906) soldered to the board, which can be bypassed to connect the board through a twisted pair to remote diodes close to your system.

The temperature data is also used by the internal dual PWM fan-speed controller to adjust the speed of up to two cooling fans. Speed control is accomplished by tachometer feedback from the fan.

The EV kit also includes Windows® 2000/XP- and Windows Vista®-compatible software, which provides a simple user interface for exercising the features of the MAX6639. The program is menu-driven and offers a graphical user interface (GUI) complete with control buttons. The EV kit comes with the MAX6639AEE+ installed. Contact the factory for free samples of the pin-compatible MAX6639FAEE+ and MAX6640AEE+.

The MAX6639 EV kit also evaluates the MAX6640. The MAX6640 is not recommended for new designs.

Applications

  • Desktop Computers
  • Networking Equipment
  • Notebook Computers
  • Projectors
  • Servers

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