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MAX6670AUB40+

P1-P3P4-P6P7-P8
General Description
The MAX6668/MAX6670 remote-junction thermal
switches with an internal power transistor drive a cool-
ing fan rated for supply voltages up to +12V and
250mA. These devices measure the temperature of an
external P-N junction (typically a diode-connected tran-
sistor) and turn on the fan power switch when the
remote temperature rises above a factory-programmed
threshold. Self-contained and requiring no software
development, 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 exceeds
the 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. The
MAX6668/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°C
using 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 +3.6V
power supply, and are specified over the automotive
temperature range (-40°C to +125°C). The MAX6668 is
offered in an 8-pin µMAX package and the MAX6670 is
available in a space-saving 10-pin µMAX package.
Applications
Notebook and Desktop Computers
Network Switches
PC Power Supplies
Laboratory Instruments
Card Racks
Temperature Alarms
Fan Controls
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
MAX6668/MAX6670
Remote Temperature Switches with Integrated
Fan Controller/Driver
________________________________________________________________ Maxim Integrated Products 1
DXP
GND
PGND
HYST
V
DD
MAX6670
FORCEON
FANOUT
WARN
OT
V
DD
DXN
V
DD
C
S
2200pF
2N3904
10kΩ
10kΩ
250mA
FAN
+3.3V
V
DD
+12V
Typical Application Circuit
Ordering Information
19-2133; Rev 2; 11/02
Pin Configuration appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
Ordering Information continued at end of data sheet.
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.
PART
TEMP
RANGE
PI N -
PA C K A G E
T H R ESH -
O L D
( ° C )
MAX6668AUA40 -40°C to +125°C 8 µMAX 40
MAX6668AUA45 -40°C to +125°C 8 µMAX 45
MAX6668AUA50 -40°C to +125°C 8 µMAX 50
MAX6668AUA60 -40°C to +125°C 8 µMAX 60
MAX6668AUA70 -40°C to +125°C 8 µMAX 70
MAX6668AUA75 -40°C to +125°C 8 µMAX 75
MAX6668/MAX6670
Remote Temperature Switches with Integrated
Fan Controller/Driver
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= +3V to +3.6V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
DD
= +3.3V and T
A
= +25°C.)
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.
V
DD
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 (V
DD
+ 0.3V)
Current into V
DD
, GND, DXP, DXN, WARN, HYST,
FORCEON, OT..............................................................±20mA
Current into FANOUT, PGND ........................................ ±300mA
Continuous Power Dissipation (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER SUPPLY
Power-Supply Range V
DD
3 3.6 V
Average Supply Current I
DD
110 200 µA
Operating Current During sampling 400 650 µA
Power-On Reset (POR) Threshold POR V
DD
falling edge 1 1.5 2.0 V
POR Threshold Hysteresis 50 mV
TEMPERATURE SENSOR
T
RJ
= +40°C to +75°C (Note 1),
T
A
= 0°C to +85°C, V
DD
= +3.3V
±1 ±2.2
FANOUT Temperature
Threshold Accuracy
∆T
TH
T
RJ
= +40°C to +75°C (Note 1),
T
A
= -40°C to +125°C, V
DD
= +3.3V
±1 ±4
°C
HYST = GND 4
HYST = float 8
MAX6670
HYST = V
DD
12
FANOUT Temperature
Threshold Hysteresis
T
HYST
MAX6668 8
°C
WARN Temperature Threshold
(MAX6670 Only)
Relative to FANOUT temperature threshold +15 °C
OT Temperature Threshold
(MAX6670 Only)
Relative to FANOUT temperature threshold +30 °C
Supply Sensitivity of Temperature
Threshold
1 1.6 °C/V
Temperature Sample Frequency 3.3 4 Hz
FAN DRIVE OUTPUT
FANOUT Output Voltage Low V
OL
I
SINK
= 250mA 0.5 1 V
Thermal Shutdown 170 °C
Thermal Shutdown Hysteresis 20 °C
LOGIC INPUT/OUTPUT
FORCEON Input High Voltage V
IH
0.8 x
V
DD
V
MAX6668/MAX6670
Remote Temperature Switches with Integrated
Fan Controller/Driver
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= +3V to +3.6V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
DD
= +3.3V and T
A
= +25°C.)
Note 1: T
RJ
is the temperature of the remote P-N junction.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FORCEON Input Low Voltage V
IL
0.2 x
V
DD
V
FORCEON Input Bias Current V
FORCEON
= V
DD
or GND 1 µA
WARN, OT Output Voltage Low V
OL
I
SINK
= 6mA 0.5 V
WARN, OT Output High Leakage
Current
I
OH
V
WARN
or V
OT
= +5.5V 1 µA
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
0 100 15050 200 250 300
FANOUT CURRENT
vs. FANOUT VOLTAGE
MAX6668/70 toc01
I
FANOUT
(mA)
V
FANOUT
(V)
T
A
= +25°C
V
DD
= +3.3V
0
0.6
0.4
0.2
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.0 2.5
3.0
3.5
FANOUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX6668/70 toc02
V
DD
(V)
V
FANOUT
(V)
T
A
= +105°C
T
A
= +65°C
T
A
= +25°C
I
FANOUT
= 250mA
0
40
20
80
60
120
100
140
SUPPLY CURRENT
vs. TEMPERATURE
MAX6668/70 toc03
TEMPERATURE (°C)
I
DD
(µA)
0 255075100
V
DD
= +3.3V, I
FANOUT
= 250mA
0
40
20
80
60
120
100
140
3.0 3.63.3
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6668/70 toc04
V
DD
(V)
I
DD
(µA)
FORCEON = V
DD
0
5
20
15
10
25
30
-1.00
-0.25
-0.50 0.50-0.75 0 0.25 0.75
1.00
TEMPERATURE THRESHOLD ERROR
MAX6668/70 toc05
THRESHOLD ERROR (°C)
PERCENTAGE OF SAMPLES (%)
MAX6670AUB040
119 SAMPLES
P1-P3P4-P6P7-P8

MAX6670AUB40+

Mfr. #:
Buy MAX6670AUB40+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Remote Temperature Switch
Lifecycle:
New from this manufacturer.
Delivery:
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