Typical operating characteristics – Rainbow Electronics MAX6640 User Manual
Page 4
MAX6640
2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C)
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6640 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
5.0
4.5
4.0
3.5
1
2
3
4
5
6
7
8
9
10
0
3.0
5.5
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6640 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
µ
A)
5.0
4.5
4.0
3.5
300
400
500
600
700
800
200
3.0
5.5
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6640 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (
°
C)
100
75
50
25
-1
0
1
2
-2
0
125
FAIRCHILD 2N3906
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6640 toc04
TEMPERATURE (°C)
TEMPERATURE ERROR (
°
C)
100
75
50
25
-0.5
-1.0
-1.5
0
0.5
1.0
-2.0
0
125
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6640 toc06
FREQUENCY (Hz)
TEMPERATURE ERROR (
°
C)
10k
1k
100
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
1
10
100k
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED TO
V
CC
WITH NO BYPASS CAPACITOR
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6640 toc07
FREQUENCY (Hz)
TEMPERATURE ERROR (
°
C)
10k
1k
100
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0.1
1
10
100k
V
IN
= AC-COUPLED TO DXP AND DXN
V
IN
= 100mV
P-P
SQUARE WAVE
REMOTE TEMPERATURE ERROR
vs. DIFFERENTIAL NOISE FREQUENCY
MAX6640 toc08
FREQUENCY (Hz)
TEMPERATURE ERROR (
°
C)
10k
1k
100
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
10
100k
V
IN
= AC-COUPLED TO DXP
V
IN
= 100mV
P-P
SQUARE WAVE
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
MAX6640 toc09
DXP-GND CAPACITANCE (nF)
TEMPERATURE ERROR (
°
C)
10
1
-5.0
-4.0
-3.0
-2.0
-1.0
0
1.0
2.0
-6.0
0.1
100
REMOTE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6640 toc05
FREQUENCY (Hz)
TEMPERATURE ERROR (
°
C)
10k
1k
100
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
10
100k
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED TO
V
CC
WITH NO BYPASS CAPACITOR