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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
V CC , ADD0, ADD1, SMBDATA,
SMBCLK, ALERT , OVERT ...................................-0.3V to +6V
V FAN , TACH IN, FAN .............................................-0.3V to +16V
DXP, GAIN..................................................-0.3V to (V CC + 0.3V)
DXN.............................................................................-0.3V to 1V
SMBDATA, ALERT , OVERT Current ...................-1mA to +50mA
DXN Current ......................................................................±1mA
FAN Out Current ..............................................................500mA
ESD Protection (Human Body Model)................................2000V
Continuous Power Dissipation (T A = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Operating Temperature Range ........................ -40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +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
(V CC = +3V to +5.5V, V VFAN = +12V, T A = -40°C to +125°C, unless otherwise specified. Typical values are at V CC = +3.3V and
T A = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ADC AND POWER SUPPLY
V CC Supply Voltage
V FAN Supply Voltage
V CC
V VFAN
3.0
4.5
5.5
13.5
V
V
Operating Supply Current
Shutdown Supply Current
I CC
I SHDN
Fan off
Shutdown
250
3
500
10
μA
μA
Temperature Resolution
0.125
11
°C
Bits
Temperature Error (Note 2)
T E
T A = +85°C,
V CC = +3.3V
T RJ = +60°C to +100°C
T RJ = +25°C to +125°C
T RJ = -40°C to +125°C
-1
-3
-5
+1
+3
+5
°C
Internal Reference Frequency
Accuracy
Temperature Conversion Time
Conversion Rate Timing Error
+25
-25
0.25
-25
+25
%
s
%
Undervoltage Lockout Threshold
V UVLO
V CC falling
2.50
2.80
3.00
V
Undervoltage Lockout Threshold
Hysteresis
V HYST
90
mV
Power-On-Reset (POR)
Threshold (V CC )
V CC rising
1.4
2.0
2.5
V
POR Threshold Hysteresis
90
mV
Remote-Junction Source Current
I RJ
High level
Low level
80
8
100
10
120
12
μA
DXN Source Voltage
V DXN
0.7
V
2
_______________________________________________________________________________________
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