MAX6684 Datasheet, PDF (2/7 Pages) Maxim Integrated Products – Fan-Failure Detector with Integrated Power Switch

Fan-Failure Detector with Integrated
Power Switch
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND, Unless Otherwise Noted
V_CC ........................................................................-0.3V to +6.0V
FC+, FC-.....................................................-0.3V to (V_CC + 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 (T_A = +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
(V_CC = 3.0 to 5.5V, OFF = V_CC, T_A = -40°C to +85°C, unless otherwise noted. Typical values are at V_CC = 3.3V, T_A = +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
V_CC Shutdown Supply Current
SENSE-to-PGND Output
Low Voltage
SENSE-to-PGND Output
On-Resistance
SENSE Leakage Current
V _FAIL Output Low Voltage
V _FAIL Output Leakage Current
Average SENSE (Fan) Current
SENSE Current Shutdown
Thermal Shutdown of SENSE
Fan-Current Fluctuation
Frequency
V _FAIL Output Delay After Fault
Minimum Fan-Current Fluctuation
Level (Note 2)
SYMBOL
V_CC
I_CC
I_SHDN
R_DSON
t_FD
CONDITIONS
I_FAN = 300mA
OFF = GND
I_FAN = 300mA
V_SENSE = 26V
I _FAIL = 3mA
V _FAIL = 5.5V
V_CC = 3V
15°C hysteresis
No fault detected
No fault detected
OFF Input High Voltage
V_IH
OFF Input Low Voltage
V_IL
OFF Input Current
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
V_CC
-10
1
2.2
Ω
1
10
µA
0.8
V
0.1
1
µA
300 mA
1200 mA
160
°C
400
Hz
1
2.0
s
35
60 mA_P-P
V
0.3 x
V_CC
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.
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