Rainbow Electronics MAX6645 - Manual (Page 3)

MAX6643/MAX6644/MAX6645
Automatic PWM Fan-Speed Controllers with
Overtemperature Output
_______________________________________________________________________________________ 3
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6643 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
5.0 4.5 4.0 3.5
240
280
320
360
400
200
3.0 5.5
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
MAX6643 toc02
TEMPERATURE ( °C)
PWMOUT FREQUENCY (Hz)
100 85 60 35 10 -15
31.2
31.4
31.6
31.8
32.0
31.0
-40
TRIP-THRESHOLD ERROR
vs. TRIP TEMPERATURE
MAX6643 toc04
TRIP TEMPERATURE ( °C)
TRIP-THRESHOLD ERROR (
°C)
80 60 40
-0.6
-0.2
0.2
0.6
1.0
-1.0
20 100
MAX664_L VERSIONS
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
MAX6643 toc03
SUPPLY VOLTAGE (V)
PWMOUT FREQUENCY (Hz)
5.0 4.5 4.0 3.5
31
32
33
34
35
30
3.0 5.5
Typical Operating Characteristics
(T A = +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V DD = +3.0V to +5.5V, T A = -40 °C to +125°C, unless otherwise noted. Typical values are at V
DD = +3.3V, T A = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUTS ( FULLSPD , FULLSPD, TACHSET)
V DD = 5.5V 3.65
Logic-Input High V IH
V DD = 3.0V 2.2
V
Logic-Input Low V IL V DD = 3.0V 0.8 V
Input Leakage Current V IN = GND or V DD -1 +1 µA
Note 1: All parameters tested at T A = +25°C. Specifications over temperature are guaranteed by design.