Rainbow Electronics MAX6661 User Manual
Page 2
MAX6661
Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 3V to 5.5V, V
FAN
= 12V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
=
+25°C.) (Notes 1 and 2)
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
CC
, ALERT, OVERT ...............................................-0.3V to +6V
V
FAN
, TACH IN, FAN .............................................-0.3V to +16V
DXP, CS, SDOUT, GAIN, SCL, SDIN..........-0.3V to (V
CC
+ 0.3V)
DXN ..........................................................................-0.3V to +1V
SDOUT Current ...................................................-1mA to +50mA
DXN Current ......................................................................±1mA
FAN Out Current ..............................................................500mA
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
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ADC AND POWER SUPPLY
0.125
°C
Temperature Resolution
(Note 3)
11
Bits
T
RJ
= +60°C to +100°C
-1
+1
°C
T
RJ
= +25°C to +125°C
-3
+3
°C
Remote-Junction Temperature
Measurement Error (Note 4)
T
E
T
A
= +85
°C,
V
CC
= 3.3V
T
RJ
= -40°C to +125°C
-5
+5
°C
Fan-Speed Measurement
Accuracy
±25
%
V
CC
Supply Voltage Range
V
CC
3.0
5.5
V
V
FAN
Supply Voltage Range
V
FAN
4.5
13.5
V
Conversion Time
0.25
s
Conversion Rate Timing Error
-25
+25
%
Undervoltage Lockout (UVLO)
Threshold
V
UVLO
V
CC
falling
2.50
2.80
2.95
V
UVLO Threshold Hysteresis
V
HYST
90
mV
POR Threshold (V
CC
)
V
CC
rising
1.4
2.0
2.5
V
POR Threshold Hysteresis
90
mV
Standby Supply Current
I
SHDN
Shutdown, configuration bit 6 = 1
3
20
µA
Operating Supply Current
I
CC
Fan off
450
700
µA
DXN Source Voltage
V
DXN
0.7
V
TACH Input Transition Level
V
FAN
= 12V
10.5
V
TACH Input Hysteresis
V
FAN
= 12V
190
mV
TACH Input Resistance
250
k
Ω
Fan Output Current
I
F
250
mA
Fan Output Current Limit
I
L
(Note 5)
320
410
mA
Fan Output On-Resistance
R
ONF
250mA load
4
Ω