Datasheet

6-Channel Intelligent Fan Controller
MAX31785
9
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
FAN POWER-ON SEQUENCING
MAX31785 toc05
100ms/div
0V
0V
0V
0V
5V/div
PWM2
PWM1
PWM0
CONTROL
I
DD
vs. TIME DURING A NONVOLATILE LOG WRITE
(T
A
= +25°C, V
DD
= 3.3V)
MAX31785 toc04
2ms/div
0mA
1mA/div
WEAK PULLUP VOLTAGE
vs. TIME DURING POWER-UP
MAX31785 toc03
2ms/div
0V
V
DD
PWMO
0V
NO LOAD
CONNECTED
TO PWM
2V/div
SUPPLY CURRENT vs. TEMPERATURE
(V
DD
= 3.3V, NO PWM SWITCHING)
MAX31785 toc02
TEMPERATURE (°C)
I
DD
(mA)
806020 400-20
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
2.0
-40 100
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(NO PWM SWITCHING)
MAX31785 toc01
V
DD
(V)
I
DD
(mA)
5.14.73.9 4.33.53.1
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
2.0
2.7 5.5