MAX6665ASA40+ Maxim Integrated Products, MAX6665ASA40+ Datasheet

IC FAN CNTRL/DRVR 8-SOIC

MAX6665ASA40+

Manufacturer Part Number
MAX6665ASA40+
Description
IC FAN CNTRL/DRVR 8-SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6665ASA45T.pdf (6 pages)

Specifications of MAX6665ASA40+

Function
Fan Control, Temp Monitor
Topology
Fan Control
Sensor Type
Internal
Sensing Temperature
40°C Trip Point
Output Type
Logic
Output Alarm
No
Output Fan
Yes
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
Temperature Threshold
+ 40 C
Full Temp Accuracy
+/- 1 C
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 tem-
perature 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 hys-
teresis is pin selectable to 1°C, 4°C, or 8°C. Two open-
drain logic outputs indicate overtemperature con-
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-
old. 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.
19-2056; Rev 0; 5/01
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.
+3.3V
Notebook and Desktop Computers
Servers
PC Power Supplies
Laboratory Instruments
Card Racks
1µF
Typical Operating Circuit
HYST
FORCEON
V
________________________________________________________________ Maxim Integrated Products
DD
MAX6665
General Description
Programmed Temperature Thresholds
GND
FANOUT
FANON
WARN
Fan Controller/Driver with Factory-
OT
100mA TO 250mA
COOLING FAN
Applications
V
V
100kΩ
100kΩ
DD
DD
+4.5V TO +24V
o On-Chip 250mA Fan Switch
o No External Components Required
o Factory-Programmed Thresholds
o Two Overtemperature Warning Signals
o Pin-Selectable 1°C, 4°C, and 8°C Hysteresis
o Low 65µA Supply Current
*Exposed paddle
MAX6665ASA40
MAX6665ASA45
MAX6665ASA50
MAX6665ASA55
MAX6665ASA60
MAX6665ASA65
MAX6665ASA70
TOP VIEW
PART
FORCEON
FANON
HYST
GND
1
2
4
3
RANGE
-40°C to
-40°C to
-40°C to
-40°C to
-40°C to
-40°C to
-40°C to
+125°C
+125°C
+125°C
+125°C
+125°C
+125°C
+125°C
TEMP.
Ordering Information
MAX6665
SO
Pin Configuration
PIN-
PACKAGE
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
6
8
7
5
FANOUT
V
WARN
OT
DD
Features
THRESHOLD
40°C
45°C
50°C
55°C
60°C
65°C
70°C
1

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MAX6665ASA40+ Summary of contents

Page 1

... MAX6665 WARN HYST OT FORCEON FANON GND ________________________________________________________________ Maxim Integrated Products 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. o On-Chip 250mA Fan Switch o No External Components Required o Factory-Programmed Thresholds o Two Overtemperature Warning Signals o Pin-Selectable 1°C, 4°C, and 8°C Hysteresis o Low 65µ ...

Page 2

Fan Controller/Driver with Factory- Programmed Temperature Thresholds ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD FANOUT to GND ....................................................-0.3V to +28V FORCEON, HYST, FANON to GND............-0. WARN GND ...................................................-0.3V to +6V FANOUT Continuous Current............................................400mA ...

Page 3

Fan Controller/Driver with Factory- Programmed Temperature Thresholds (V = +3.3V, unless otherwise noted.) DD FANOUT VOLTAGE vs. CURRENT 900 T = +75°C A 800 700 600 500 400 300 200 100 0 10 FANOUT CURRENT (mA) NO-LOAD SUPPLY CURRENT vs. ...

Page 4

Fan Controller/Driver with Factory- Programmed Temperature Thresholds PIN NAME 1 GND Ground Force Fan On Input. Set FORCEON low to force the fan switch on. Set FORCEON high for normal FORCEON 2 operation. Three-State Hysteresis Input. Connect HYST to V ...

Page 5

Fan Controller/Driver with Factory- Programmed Temperature Thresholds +3.3V 1µF Figure 1. High-Reliability, Fail-Safe Fan Controller and Temperature Monitor increases by a maximum of: 51°C/W x 0.03125W = 1.59°C Therefore, the effective hysteresis is about 1.59°C high- er than the hysteresis ...

Page 6

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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