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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6684 Datasheet

Fan-Failure Detector with Integrated Power Switch

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MAX6684 pdf
19-2306; Rev 0; 1/02
Fan-Failure Detector with Integrated
Power Switch
General Description
The MAX6684 is an integrated fan-failure detector that
detects when a fan exhibits excessive underspeed or a
locked rotor. This device is especially well suited for criti-
cal systems where no fan control, or simple on/off control
is desired. The MAX6684 detects fan failure by evaluat-
ing fluctuations in current at the low side of the fan; no
tachometer signal is necessary. The output of the device,
FAIL, is an active-low, open-drain alarm. The MAX6684
can also be used to switch the fan on or off, based on
the state of a logic-level input, OFF. This device can be
used with fans rated at up to 24V and 250mA. The
MAX6684 is available in an 8-pin SO package, and is
specified for operation from -40°C to +85°C.
Features
o Dedicated Fan-Failure Detector
o Works with Ordinary 2-Wire Fans
o No Fan Tachometer Output Required
o No Software Development Required
o No Analog Circuit Design Required
o Logic-Level Fan Driver Control
o Works with Fans Rated Up to 24V/250mA
Desktop PCs
Notebooks
Networking Equipment
Telecommunications
Industrial Applications
Applications
PART
MAX6684ESA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Typical Operating Circuit
3.3V
VCC
OFF
MAX6684
FC+ FAIL
1µF 0.1µF
FC-
GND
SENSE
PGND
12V
10k
0.1µF
Pin Configuration
TOP VIEW
SENSE 1
FAIL 2
GND 3
FC- 4
MAX6684
8 PGND
7 OFF
6 VCC
5 FC+
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6684 Datasheet

Fan-Failure Detector with Integrated Power Switch

No Preview Available !

MAX6684 pdf
Fan-Failure Detector with Integrated
Power Switch
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND, Unless Otherwise Noted
VCC ........................................................................-0.3V to +6.0V
FC+, FC-.....................................................-0.3V to (VCC + 0.3V)
OFF, FAIL ..............................................................-0.3V to +6.0V
PGND ....................................................................-0.3V to +0.3V
SENSE to PGND ..................................................-0.3V to +28.0V
SENSE Current................................................................1400mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Soldering Temperature (vapor phase, 60s).....................+215°C
Soldering Temperature (infrared, 15s).............................+220°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
(VCC = 3.0 to 5.5V, OFF = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
VCC Shutdown Supply Current
SENSE-to-PGND Output
Low Voltage
SENSE-to-PGND Output
On-Resistance
SENSE Leakage Current
VFAIL Output Low Voltage
VFAIL Output Leakage Current
Average SENSE (Fan) Current
SENSE Current Shutdown
Thermal Shutdown of SENSE
Fan-Current Fluctuation
Frequency
VFAIL Output Delay After Fault
Minimum Fan-Current Fluctuation
Level (Note 2)
SYMBOL
VCC
ICC
ISHDN
RDSON
tFD
CONDITIONS
IFAN = 300mA
OFF = GND
IFAN = 300mA
VSENSE = 26V
IFAIL = 3mA
VFAIL = 5.5V
VCC = 3V
15°C hysteresis
No fault detected
No fault detected
OFF Input High Voltage
VIH
OFF Input Low Voltage
OFF Input Current
VIL
MIN TYP MAX UNITS
3.0 5.5 V
3.4 mA
10 µA
0.3 0.66
V
50
600
25
0.3
15
0.7 x
VCC
-10
1 2.2
1 10 µA
0.8 V
0.1 1 µA
300 mA
1200 mA
160 °C
400 Hz
1 2.0 s
35 60 mAP-P
V
0.3 x
VCC
V
0 1 µA
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: The MAX6684 is guaranteed to register a fault when the fan current fluctuates less than the minimum; it is guaranteed not to
register a fault when the fan current is above the maximum.
2 _______________________________________________________________________________________


Part Number MAX6684
Description Fan-Failure Detector with Integrated Power Switch
Maker Maxim
Total Page 7 Pages
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