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Part Number: MAX6665
Description: The MAX6665 is a fully integrated thermal switch with an internal power transistor for driving a cooli...
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MAX6665
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DataSheet
General Description
MAX6665 General Description
The MAX6665 is a fully integrated thermal switch with an internal power transistor for driving a cooling fan rated up to 24V and 250mA. When the MAX6665's temperature rises above a factory-programmed threshold, the FANOUT pin becomes active and powers the fan. The MAX6665 is available with factory-programmed fan activation threshold temperatures from +40°C to +70°C in 5°C increments. Accuracy of the fan activation trip point is ±1°C (typ) and ±3°C (max).
The trip point's hysteresis is pin selectable to 1°C, 4°C, or 8°C. Two opendrain logic outputs indicate overtemperature conditions: WARN is activated when the temperature is 15°C above the fan activation threshold, and OT is activated when the temperature is 30°C above the threshold. These features can be used to safely power down systems that are overheated. The MAX6665 operates from a +2.7V to +5.5V power supply, and the associated fan can be powered from 4.5V to 24V. It is available in an 8-pin SO package and operates from -40°C to +125°C.
MAX6665 Maximum Ratings
VDD to GND..............................................................-0.3V to +6V
FANOUT to GND ....................................................-0.3V to +28V
FORCEON, HYST, FANON to GND............-0.3V to (VDD + 0.3V)
WARN, OT to GND ...................................................-0.3V to +6V
FANOUT Continuous Current............................................400mA
All Other Pins ....................................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 19.6mW/°C above +70°C).............1568mW
Operating Temperature Range .........................-40°C to +125°C
Junction (storage) Temperature Range ............-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX6665 Features
On-Chip 250mA Fan Switch
No External Components Required
Factory-Programmed Thresholds
Two Overtemperature Warning Signals
Pin-Selectable 1°C, 4°C, and 8°C Hysteresis
Low 65µA Supply Current
No External Components Required
Factory-Programmed Thresholds
Two Overtemperature Warning Signals
Pin-Selectable 1°C, 4°C, and 8°C Hysteresis
Low 65µA Supply Current
MAX6665 Typical Application
Notebook and Desktop Computers
Servers
PC Power Supplies
Laboratory Instruments
Card Racks
Servers
PC Power Supplies
Laboratory Instruments
Card Racks
MAX6665 Connection Diagram
MAX6665
PDF/DataSheet Download
- Datasheet: MAX6665
- File Size: 133171 KB
- Manufacturer: Maxim
- Click here to Download
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