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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6668 Datasheet

(MAX6668 / MAX6670) Remote Temperature Switches

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MAX6668 pdf
19-2133; Rev 2; 11/02
Remote Temperature Switches with Integrated
Fan Controller/Driver
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
www.DoaftfaeSrehedeti4nUa.cnom8-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
o +12V, 250mA Integrated Fan Driver
o No Calibration Required
o Pin-Selectable 4°C, 8°C, or 12°C Hysteresis
(MAX6670)
o Factory-Programmed Temperature Thresholds
from +40°C to +75°C
o Overtemperature Warning Signals
o 110µA (typ) Supply Current
o Space-Saving 8-Pin and 10-Pin µMAX Packages
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
THRESH-
OLD
(°C)
MAX6668AUA40 -40°C to +125°C
MAX6668AUA45 -40°C to +125°C
MAX6668AUA50 -40°C to +125°C
MAX6668AUA60 -40°C to +125°C
MAX6668AUA70 -40°C to +125°C
MAX6668AUA75 -40°C to +125°C
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
40
45
50
60
70
75
Ordering Information continued at end of data sheet.
Typical Application Circuit
CS
2200pF
2N3904
+3.3V
VDD
DXP FANOUT
MAX6670
DXN WARN
+12V
250mA
FAN
VDD
10k
VDD
10k
Pin Configuration appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
HYST
OT
GND PGND FORCEON
VDD
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6668 Datasheet

(MAX6668 / MAX6670) Remote Temperature Switches

No Preview Available !

MAX6668 pdf
Remote Temperature Switches with Integrated
Fan Controller/Driver
ABSOLUTE MAXIMUM RATINGS
VDD 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 (VDD + 0.3V)
Current into VDD, GND, DXP, DXN, WARN, HYST,
FORCEON, OT..............................................................±20mA
Current into FANOUT, PGND ........................................ ±300mA
Continuous Power Dissipation (TA = +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
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.
ELECTRICAL CHARACTERISTICS
(VDD = +3V to +3.6V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = +3.3V and TA = +25°C.)
PARAMETER
POWER SUPPLY
Power-Supply Range
Average Supply Current
Operating Current
Power-On Reset (POR) Threshold
POR Threshold Hysteresis
TEMPERATURE SENSOR
FANOUT Temperature
Threshold Accuracy
www.DaFtaASNhOeUetT4UTe.cmomperature
Threshold Hysteresis
WARN Temperature Threshold
(MAX6670 Only)
SYMBOL
CONDITIONS
VDD
IDD
POR
During sampling
VDD falling edge
TTH
THYST
TRJ = +40°C to +75°C (Note 1),
TA = 0°C to +85°C, VDD = +3.3V
TRJ = +40°C to +75°C (Note 1),
TA = -40°C to +125°C, VDD = +3.3V
HYST = GND
MAX6670
HYST = float
MAX6668
HYST = VDD
Relative to FANOUT temperature threshold
OT Temperature Threshold
(MAX6670 Only)
Relative to FANOUT temperature threshold
Supply Sensitivity of Temperature
Threshold
Temperature Sample Frequency
FAN DRIVE OUTPUT
FANOUT Output Voltage Low
Thermal Shutdown
Thermal Shutdown Hysteresis
LOGIC INPUT/OUTPUT
VOL ISINK = 250mA
FORCEON Input High Voltage
VIH
MIN TYP MAX
3 3.6
110 200
400 650
1 1.5 2.0
50
±1 ±2.2
±1 ±4
4
8
12
8
+15
+30
1 1.6
3.3 4
0.5 1
170
20
0.8 x
VDD
UNITS
V
µA
µA
V
mV
°C
°C
°C
°C
°C/V
Hz
V
°C
°C
V
2 _______________________________________________________________________________________


Part Number MAX6668
Description (MAX6668 / MAX6670) Remote Temperature Switches
Maker Maxim Integrated Products
Total Page 8 Pages
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