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MAX6668AUA70

更新时间： 2024-11-28 22:36:55
品牌 Logo 应用领域
美信 - MAXIM 驱动器风扇开关控制器
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8页 217K
描述
Remote Temperature Switches with Integrated Fan Controller/Driver

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MAX6668AUA70 数据手册

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19-2133; Rev 2; 11/02  
Remote Temperature Switches with Integrated  
Fan Controller/Driver  
General Description  
Features  
The MAX6668/MAX6670 remote-junction thermal  
switches with an internal power transistor drive a cool-  
ing 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 tran-  
sistor) 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.  
ꢀ +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  
The MAX6670 features an open-drain 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,  
FORCEON, that allows the fan to be driven externally,  
regardless of temperature.  
ꢀ Space-Saving 8-Pin and 10-Pin µMAX Packages  
Ordering Information  
THRESH-  
OLD  
( C)  
TEMP  
RANGE  
PIN-  
PACKAGE  
PART  
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.  
MAX6668AUA40 -40 C to +125 C  
MAX6668AUA45 -40 C to +125 C  
MAX6668AUA50 -40 C to +125 C  
MAX6668AUA60 -40 C to +125 C  
MAX6668AUA70 -40 C to +125 C  
MAX6668AUA75 -40 C to +125 C  
8 µMAX  
8 µMAX  
8 µMAX  
8 µMAX  
8 µMAX  
8 µMAX  
40  
45  
50  
60  
70  
75  
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.  
Ordering Information continued at end of data sheet.  
Typical Application Circuit  
Applications  
+12V  
Notebook and Desktop Computers  
250mA  
Network Switches  
+3.3V  
FAN  
PC Power Supplies  
Laboratory Instruments  
Card Racks  
V
DD  
DXP  
DXN  
FANOUT  
V
DD  
C
S
10k  
2200pF  
MAX6670  
Temperature Alarms  
Fan Controls  
2N3904  
WARN  
V
10k  
DD  
OT  
HYST  
V
DD  
FORCEON  
GND  
PGND  
Pin Configuration appears at end of data sheet.  
Typical Operating Circuit appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
12345678

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