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MFG:Maxim
Part Number: MAX6670AUB50
MFG: Maxim
Description: The MAX6668/MAX6670 remote-junction thermal switches with an internal power transistor drive a c...
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MAX6670AUB50
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DataSheet
General Description
MAX6670AUB50 General Description
The MAX6668/MAX6670 remote-junction thermal switches with an internal power transistor drive a coolingfan rated for supply voltages up to +12V and 250mA. These devices measure the temperature of anexternal P-N junction (typically a diode-connected transistor) and turn on the fan power switch when theremote temperature rises above a factory-programmed threshold. Self-contained and requiring no softwaredevelopment, the MAX6668/MAX6670 are simple"drop-in" fan-control solutions for a variety of systems.
The MAX6670 features an open-drain WARN output that goes active when the remote temperature exceedsthe 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. TheMAX6668/MAX6670 provide a fan-control input,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°Cusing 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 +3.6Vpower supply, and are specified over the automotive temperature range (-40°C to +125°C). The MAX6668 isoffered in an 8-pin µMAX package and the MAX6670 isavailable in a space-saving 10-pin µMAX package.
MAX6670AUB50 Maximum Ratings
VDD to GND..............................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
FANOUT to GND ....................................................-0.3V to +15V
DXN to GND ..........................................................-0.3V to +0.8V
DXP, WARN, HYST, FORCEON, OT...........-0.3V to (VDD + 0.3V)
Current into VDD, GND, DXP, DXN, WARN, HYST,
FORCEON, OT..............................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C).............333mW
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Current into FANOUT, PGND ........................................ ±300mA
MAX6670AUB50 Features
+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
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
MAX6670AUB50 Typical Application
Notebook and Desktop Computers
Network Switches
PC Power Supplies
Laboratory Instruments
Card Racks
Temperature Alarms
Fan Controls
Network Switches
PC Power Supplies
Laboratory Instruments
Card Racks
Temperature Alarms
Fan Controls
MAX6670AUB50 Connection Diagram
MAX6670AUB50
PDF/DataSheet Download
- Datasheet: MAX6670AUB50
- File Size: 222384 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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