P re c is io n , Hig h -S id e
Cu rre n t -S e n s e Am p lifie rs
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(Typical Operating Circuit (MAX471) or circuit of Figure 4, RG1 = RG2 = 200Ω, R
= 2kΩ (MAX472), T = +25°C, unless
OUT
A
otherwise noted.)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
SIGN THRESHOLD vs.
SUPPLY VOLTAGE
65
60
2.5
4
T = -40°C
A
T = +85°C
A
T = -40°C
A
3
2
2.0
1.5
1.0
0.5
0
55
50
45
40
35
T = +25°C
A
T = +25°C
A
1
T = +25°C
A
0
T = +85°C
A
T = -40°C
A
T = +85°C
A
-1
-2
1/MAX472
3
6
9
12 15 18 21 24 27 30 33 36
3
6
9
12 15 18 21 24 27 30 33 36
(V)
3
6
9
12 15 18 21 24 27 30 33 36
V
(V)
V
RS+
V
(V)
RS+
RS+
MAX471
MAX471
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX471
ERROR vs. LOAD CURRENT
NO-LOAD OFFSET CURRENT vs.
SUPPLY VOLTAGE
40
2.4
15
12
9
I
= 1A
VS+ = VS-
LOAD
2.2
2.0
1.8
35
30
25
20
15
10
5
I
FROM RS- TO RS+
LOAD
T = -40°C
A
RS+
RS–
V = 0V TO 0.5V
V = 0V TO 1V
OUT
6
GND
A
5V
1µF
3
1.6
1.4
1.2
1.0
V
5Ω
T = +85°C
A
0
-3
-6
-9
T = +25°C
A
V = 0mV TO 50mV
I
FROM RS+ TO RS-
1
LOAD
0.8
0.6
-12
-15
0
0.01
0.10
10
0.01
0.10
1
10
100
1000
3
6
9
12 15 18 21 24 27 30 33 36
I
(A)
POWER-SUPPLY FREQUENCY (kHz)
V
RS+
(V)
LOAD
MAX471
MAX472
MAX472
ERROR vs. SUPPLY VOLTAGE
RS+ TO RS- RESISTANCE vs.
TEMPERATURE
NO-LOAD OUTPUT ERROR vs.
SUPPLY VOLTAGE
40
38
3.0
2.5
1.10
1.00
0.90
0.80
0.70
V
-V
= 60mV,
RG1 RG2
RG1 = RG2 = 0Ω
RG1 = RG2 = 200Ω
T = +85°C
A
T = +85°C
A
36
34
2.0
1.5
1.0
0.5
0
T = +25°C
A
T = +25°C
A
32
30
T = -40°C
A
T = -40°C
A
28
3
6
9
12 15 18 21 24 27 30 33 36
(V)
-40 -20
0
20
40
60
80
3
6
9
12 15 18 21 24 27 30 33 36
(V)
V
CC
TEMPERATURE (°C)
V
CC
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
