MAX31790
6-Channel PWM-Output Fan RPM Controller
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V , SDA, SCL, ADD0, ADD1,
Continuous Power Dissipation (T = +70NC)
CC
A
FAN_FAIL, PWMOUTn Relative to GND...........-0.3V to +6.0V
Voltage Range on TACHn, WD_START, SPIN_START,
FREQ_START, CLKOUT, FULL_SPEED,
TDFN (derate 20.8 mW/NC above +70NC).............1666.7 mW
Operating Temperature Range........................ -40NC to +125NC
Storage Temperature Range............................ -65NC to +150NC
Junction Temperature .....................................................+150NC
ESD Protection (All Pins, HBM) (Note 1)........................ Q2000V
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
PWM_STARTn Relative to GND ..............-0.3V to V
+ 0.3V
CC
(not to exceed +6.0V)
Input Current at Any Pin.................................................... +5mA
Package Input Current.................................................... +20mA
Note 1: Human Body Model, 100pF discharged through a 1.5kω resistor.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion 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.
RECOMMENDED OPERATING CONDITIONS
(T = -40°C to +125°C, unless otherwise noted.) (Notes 2, 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V
3.0
3.3
5.5
V
CC
V
CC
0.7
x
Input High Voltage
Input Low Voltage
V
V
V
IH
V
CC
0.3
x
V
IL
ELECTRICAL CHARACTERISTICS
(T = -40°C to +125°C, typical values are V
= 3.3V, T = +25°C, unless otherwise noted.) (Notes 2, 3)
A
A
CC
PARAMETER
SYMBOL
CONDITIONS
< 3.6V
MIN
TYP
1.5
2.5
2
MAX
UNITS
3.0V < V
4.5V < V
3
8
Quiescent Supply Current
(Note 4)
CC
I
mA
CC
< 5.5V
CC
POR Threshold
V
V
s
POR
Watchdog Timer Accuracy
f
I
I
= 32.768kHz (Note 5)
-0.5
+0.5
0.4
TOSC
Output Low Voltage (SDA, FAN_
FAIL, PWMOUTn, CLKOUT)
= 3mA
V
OL
Output High Voltage (CLKOUT)
XTAL1 Input Threshold
Input Leakage
= 1mA, V
= 3.0V
2.7
-1
V
V
OH
CC
0.85
5
I
(Note 6)
All digital inputs
+1
FA
pF
L
Input Capacitance
Maxim Integrated
2