Datasheet MAX6665 (Maxim)
| Manufacturer | Maxim |
| Description | Fan Controller/Driver with Factory-Programmed Temperature Thresholds |
| Pages / Page | 6 / 1 — Fan Controller/Driver with Factory-. Programmed Temperature Thresholds. … |
| File Format / Size | PDF / 133 Kb |
| Document Language | English |
Fan Controller/Driver with Factory-. Programmed Temperature Thresholds. MAX6665. General Description. Features
Model Line for this Datasheet
Text Version of Document
19-2056; Rev 0; 5/01
Fan Controller/Driver with Factory- Programmed Temperature Thresholds MAX6665 General Description Features
The MAX6665 is a fully integrated thermal switch with ♦
On-Chip 250mA Fan Switch
an internal power transistor for driving a cooling fan rated up to 24V and 250mA. When the MAX6665’s tem- ♦
No External Components Required
perature rises above a factory-programmed threshold, ♦
Factory-Programmed Thresholds
the FANOUT pin becomes active and powers the fan. ♦
Two Overtemperature Warning Signals
The MAX6665 is available with factory-programmed fan activation threshold temperatures from +40°C to +70°C ♦
Pin-Selectable 1°C, 4°C, and 8°C Hysteresis
in 5°C increments. Accuracy of the fan activation trip ♦
Low 65µA Supply Current
point is ±1°C (typ) and ±3°C (max). The trip point’s hys- teresis is pin selectable to 1°C, 4°C, or 8°C. Two open- drain logic outputs indicate overtemperature con-
Ordering Information
ditions: WARN is activated when the temperature is 15°C above the fan activation threshold, and OT is acti- vated when the temperature is 30°C above the thresh-
TEMP. PIN- PART THRESHOLD
old. These features can be used to safely power down
RANGE PACKAGE
systems that are overheated. -40°C to MAX6665ASA40 8 SO-EP* 40°C The MAX6665 operates from a +2.7V to +5.5V power +125°C supply, and the associated fan can be powered from -40°C to 4.5V to 24V. It is available in an 8-pin SO package and MAX6665ASA45 8 SO-EP* 45°C +125°C operates from -40°C to +125°C. -40°C to
Applications
MAX6665ASA50 8 SO-EP* 50°C +125°C Notebook and Desktop Computers -40°C to MAX6665ASA55 8 SO-EP* 55°C Servers +125°C PC Power Supplies -40°C to MAX6665ASA60 8 SO-EP* 60°C +125°C Laboratory Instruments -40°C to Card Racks MAX6665ASA65 8 SO-EP* 65°C +125°C
Typical Operating Circuit
-40°C to MAX6665ASA70 8 SO-EP* 70°C +125°C +4.5V TO +24V *Exposed paddle 100mA TO 250mA COOLING FAN
Pin Configuration
TOP VIEW +3.3V VDD FANOUT VDD 1µF MAX6665 100kΩ GND 1 8 FANOUT HYST WARN VDD FORCEON 2 7 VDD MAX6665 100kΩ HYST 3 6 WARN FORCEON OT FANON 4 5 OT FANON GND
SO ________________________________________________________________ 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.
Fan Controller/Driver with Factory- Programmed Temperature Thresholds MAX6665 General Description Features
The MAX6665 is a fully integrated thermal switch with ♦
On-Chip 250mA Fan Switch
an internal power transistor for driving a cooling fan rated up to 24V and 250mA. When the MAX6665’s tem- ♦
No External Components Required
perature rises above a factory-programmed threshold, ♦
Factory-Programmed Thresholds
the FANOUT pin becomes active and powers the fan. ♦
Two Overtemperature Warning Signals
The MAX6665 is available with factory-programmed fan activation threshold temperatures from +40°C to +70°C ♦
Pin-Selectable 1°C, 4°C, and 8°C Hysteresis
in 5°C increments. Accuracy of the fan activation trip ♦
Low 65µA Supply Current
point is ±1°C (typ) and ±3°C (max). The trip point’s hys- teresis is pin selectable to 1°C, 4°C, or 8°C. Two open- drain logic outputs indicate overtemperature con-
Ordering Information
ditions: WARN is activated when the temperature is 15°C above the fan activation threshold, and OT is acti- vated when the temperature is 30°C above the thresh-
TEMP. PIN- PART THRESHOLD
old. These features can be used to safely power down
RANGE PACKAGE
systems that are overheated. -40°C to MAX6665ASA40 8 SO-EP* 40°C The MAX6665 operates from a +2.7V to +5.5V power +125°C supply, and the associated fan can be powered from -40°C to 4.5V to 24V. It is available in an 8-pin SO package and MAX6665ASA45 8 SO-EP* 45°C +125°C operates from -40°C to +125°C. -40°C to
Applications
MAX6665ASA50 8 SO-EP* 50°C +125°C Notebook and Desktop Computers -40°C to MAX6665ASA55 8 SO-EP* 55°C Servers +125°C PC Power Supplies -40°C to MAX6665ASA60 8 SO-EP* 60°C +125°C Laboratory Instruments -40°C to Card Racks MAX6665ASA65 8 SO-EP* 65°C +125°C
Typical Operating Circuit
-40°C to MAX6665ASA70 8 SO-EP* 70°C +125°C +4.5V TO +24V *Exposed paddle 100mA TO 250mA COOLING FAN
Pin Configuration
TOP VIEW +3.3V VDD FANOUT VDD 1µF MAX6665 100kΩ GND 1 8 FANOUT HYST WARN VDD FORCEON 2 7 VDD MAX6665 100kΩ HYST 3 6 WARN FORCEON OT FANON 4 5 OT FANON GND
SO ________________________________________________________________ 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.
