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Maxim > Products > [Temperature Sensors] 
MAX6668, MAX6670
Remote Temperature Switches with Integrated Fan Controller/Driver


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 224kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX6668/MAX6670 remote-junction thermal switches with an internal power transistor drive a cooling fan rated for supply voltages up to +12V and 250mA. These devices measure the temperature of an external P-N junction (typically a diode-connected transistor) and turn on the fan power switch when the remote temperature rises above a factory-programmed threshold. Self-contained and requiring no software development, the MAX6668/MAX6670 are simple “drop-in” fan-control solutions for a variety of systems.

The MAX6670 features an open-drain active-low WARN output that goes active when the remote temperature exceeds the factory-programmed fan activation threshold by +15°C. The MAX6670 features an open-drain OT output that goes active when the remote temperature exceeds the factory-programmed threshold by +30°C. The MAX6668/MAX6670 provide a fan-control input, active-low FORCEON, that allows the fan to be driven externally, regardless of temperature.

Available temperature thresholds range from +40°C to +75°C in 5°C increments. Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C, 8°C, or 12°C using a three-level logic input on the MAX6670. Temperature threshold accuracy is ±1°C (typ) and ±2.2°C (max) for remote-junction temperatures from +40°C to +75°C.

The MAX6668/MAX6670 operate from a +3V to +3.6V power supply, and are specified over the automotive temperature range (-40°C to +125°C). The MAX6668 is offered in an 8-pin µMAX package and the MAX6670 is available in a space-saving 10-pin µMAX package.

Key Features   Applications/Uses
  • +12V, 250mA Integrated Fan Driver
  • No Calibration Required
  • Pin-Selectable 4°C, 8°C, or 12°C Hysteresis (MAX6670)
  • Factory-Programmed Temperature Thresholds from +40°C to +75°C
  • Overtemperature Warning Signals
  • 110µA (typ) Supply Current
  • Space-Saving 8-Pin and 10-Pin µMAX Packages

 
  		• Card Racks
  		• Fan Control
  		• Laboratory Instruments
  		• Network Hubs, Switches, Routers
  		• Notebook and Desktop Computers
  		• PC Power Supplies
  		• Temperature Alarms

    Key Specifications:  Fan Controllers
    Part Number Sensor Type Fan Controller Functions Fan Cntrl. Interface Accuracy
    (±°C)    		 Temp. Thresh.
    (°C)    		 Features Price
    See Notes
    MAX6668  Remote Temperature Switch/Temperature Comparator Linear Logic 2.2
    +40
    +45
    +50
    +55
    +60
    +65
    +70
    +75
    		 - $1.11 @1k
    MAX6670 
    Second Threshold (Warning)
    Two Alarm Outputs
    		 $1.24 @1k
    See All Fan Controllers (19)

    Diagram
    MAX6668, MAX6670: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 3149: Circuit Converts PWM to Amplified and Buffered Linear Signal - MAX6668, MAX6670

    Design Guides
  		• Thermal Management (PDF)

    Reliability Reports
  		• Reliability Report: MAX6668.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-41 of 41

    MAX6668 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6668AUA75    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6668AUA50+  
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6668AUA50+T    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6668AUA40    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA40-T    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA45    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA50    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA50-T    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA55    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA60    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA65    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6668AUA70    
    		Active µMAX;8 pin;16.2 mm²
    Outline Drawing: 21-0036 (PDF)
    Land Pattern: 90-0092 (PDF)
    Use pkgcode/variation: U8CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6670AUB75    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB40+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB45+    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB50+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB70+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB40    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB40-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB45    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB45-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB50    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB50-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB55    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB55-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB60    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB60-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB65    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB65-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB70    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB70-T    
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN-1*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6670AUB50+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB55+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB60+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB40+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB45+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB65+  
    		Active µMAX;10 pin;15.4 mm²
    Outline Drawing: 21-0061 (PDF)
    Land Pattern: 90-0330 (PDF)
    Use pkgcode/variation: U10CN+1*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6670AUB55+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB60+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB65+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6670AUB70+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +125°C See data sheet

    More Information
  		• New Product Press Release 2001-10-02 
  		• Temperature Family by Product Type

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    Document Ref.: 19-2133; Rev 2; 2002-12-19
    This page last modified: 2007-06-27


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