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MAX6665ASA70+

P1-P3P4-P6
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 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.
Applications
Notebook and Desktop Computers
Servers
PC Power Supplies
Laboratory Instruments
Card Racks
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
MAX6665
Fan Controller/Driver with Factory-
Programmed Temperature Thresholds
________________________________________________________________ Maxim Integrated Products 1
FANON
1
2
8
7 V
DD
HYST
GND
SO
TOP VIEW
3
4
6
5
MAX6665
FORCEON
FANOUT
WARN
OT
Pin Configuration
V
DD
FANON
GND
HYST
V
DD
+3.3V
+4.5V TO +24V
100mA TO 250mA
COOLING FAN
100kΩ
1µF
MAX6665
FORCEON
FANOUT
WARN
OT
V
DD
100kΩ
Typical Operating Circuit
19-2056; Rev 0; 5/01
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
THRESHOLD
MAX6665ASA40
-40°C to
+125°C
8 SO-EP* 40°C
MAX6665ASA45
-40°C to
+125°C
8 SO-EP* 45°C
MAX6665ASA50
-40°C to
+125°C
8 SO-EP* 50°C
MAX6665ASA55
-40°C to
+125°C
8 SO-EP* 55°C
MAX6665ASA60
-40°C to
+125°C
8 SO-EP* 60°C
MAX6665ASA65
-40°C to
+125°C
8 SO-EP* 65°C
MAX6665ASA70
-40°C to
+125°C
8 SO-EP* 70°C
*Exposed paddle
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.
MAX6665
Fan Controller/Driver with Factory-
Programmed Temperature Thresholds
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1: Specifications over temperature are guaranteed by design. Parts are 100% production tested at 10°C below the tempera-
ture threshold.
V
DD
to GND..............................................................-0.3V to +6V
FANOUT to GND ....................................................-0.3V to +28V
FORCEON, HYST, FANON to GND............-0.3V to (V
DD
+ 0.3V)
WARN, OT to GND ...................................................-0.3V to +6V
FANOUT Continuous Current............................................400mA
All Other Pins ....................................................................±20mA
Continuous Power Dissipation (T
A
= +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
ELECTRICAL CHARACTERISTICS
(V
DD
= +2.7V to +5.5V, T
A
= -40°C to +125°C. Typical values are at V
DD
= +3.3V and T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
DD
pin 2.7 5.5 V
Supply Current No load 65 200 µA
FANOUT Drive Voltage FANOUT pin 26 V
V
FANOUT
< 0.8V 250
FAN OUT Outp ut C ur r ent C ap ab i l i ty
V
FANOUT
< 0.6V, T
A
≤ T
TH
+10°C, V
CC
≥ +3.3V 250
mA
FANOUT Leakage Current V
FANOUT
= 26V, T
A
= +60°C3µA
MAX6665ASA40 40
MAX6665ASA45 45
MAX6665ASA50 50
MAX6665ASA55 55
MAX6665ASA60 60
MAX6665ASA65 65
FANOUT Threshold, T
TH
MAX6665ASA70 70
°C
FANOUT Threshold Error -3 ±1+3°C
HYST is unconnected 1
HYST ≤ 0.3V
DD
4
FANOUT Hysteresis
HYST ≥ 0.7V
DD
8
°C
WARN Threshold Relative to FANOUT temperature threshold +15 °C
OT Threshold Relative to FANOUT temperature threshold +30 °C
WARN and OT Hysteresis 2 °C
FANON Output High Voltage I
FANON
= 0.5mA source 2.0 V
FANON Output Low Voltage I
FANON
= 0.5mA sink 0.7 V
I
WARN
= 1.2mA or I
OT
= 1.2mA sink 0.3
W ARN and O T Outp ut V ol tag e Low
I
WARN
= 20mA or I
OT
= 20mA sink 0.5
V
Open-Drain Leakage Current V
WARN
= 5.5V or V
OT
= 5.5V 0.1 µA
Input Low Voltage FORCEON and HYST pins 0.3V
DD
V
Input High Voltage FORCEON and HYST pins 0.7V
DD
V
FORCEON connected to V
DD
or GND -1 +1
Input Current
HYST connected to V
DD
or GND -15 +15
µA
MAX6665
Fan Controller/Driver with Factory-
Programmed Temperature Thresholds
_______________________________________________________________________________________ 3
900
800
700
600
500
400
300
200
100
0
10 100 1000
MAX6665 toc01
FANOUT VOLTAGE vs. CURRENT
FANOUT CURRENT (mA)
FANOUT VOLTAGE (mV)
T
A
= +75°C
V
DD
= +2.7V
V
DD
= +3.3V
V
DD
= +5.0V
250
350
300
450
400
500
550
2.7 3.9 4.33.1 3.5 4.7 5.1 5.5
MAX6665 toc02
SUPPLY VOLTAGE (V)
FANOUT VOLTAGE (mV)
FANOUT VOLTAGE vs. SUPPLY VOLTAGE
FANOUT CURRENT = 250mA
T
A
= +75°C
T
A
= +50°C
30
40
50
60
70
80
90
-40 0-20 20 40 60 80 100 120
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
MAX6665 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
FORCEON = V
DD
V
DD
= +5V
V
DD
= +3.3V
V
DD
= +2.7V
0
5
10
15
20
25
30
35
40
45
50
0
-2.0 -0.5-1.5 0.5-1.0 1.0 1.5 2.0 2.5-2.5 3.0-3.0
TEMPERATURE THRESHOLD
DISTRIBUTION
MAX6665 toc04
TEMPERATURE ERROR (°C)
PERCENTAGE OF SAMPLES (%)
MAX6665ASA55
100 SAMPLES
Typical Operating Characteristics
(V
DD
= +3.3V, unless otherwise noted.)
P1-P3P4-P6

MAX6665ASA70+

Mfr. #:
Buy MAX6665ASA70+
Manufacturer:
Maxim Integrated
Description:
Motor / Motion / Ignition Controllers & Drivers Fan Controller Drive
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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