Precision, High-Side
Current-Sense Amplifiers
MAX471/MAX472
__________________________________________Typical Operating Characteristics
(Typical Operating Circuit (MAX471) or circuit of Figure 4, RG1 = RG2 = 200Ω, R
OUT
= 2kΩ (MAX472), T
A
= +25°C, unless
otherwise noted.)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX1471-01
SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
MAX1471-02
SIGN THRESHOLD vs.
SUPPLY VOLTAGE
T
A
= -40°C
3
SIGN THRESHOLD (mA)
2
1
T
A
= +25°C
0
-1
-2
T
A
= +85°C
MAX1471-03
65
60
SUPPLY CURRENT (µA)
55
T
A
= +85°C
2.5
T
A
= -40°C
4
2.0
I
SHDN
(µA)
50
45
T
A
= +25°C
1.5
T
A
= +25°C
1.0
T
A
= +85°C
T
A
= -40°C
40
35
3
6
9 12 15 18 21 24 27 30 33 36
V
RS+
(V)
0.5
0
3
6
9 12 15 18 21 24 27 30 33 36
V
RS+
(V)
3
6
9 12 15 18 21 24 27 30 33 36
V
RS+
(V)
MAX471
NO-LOAD OFFSET CURRENT vs.
SUPPLY VOLTAGE
MAX1471-04
MAX471
ERROR vs. LOAD CURRENT
MAX471-05
MAX471
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
I
LOAD
= 1A
35
RS+ RS–
MAX471-06
2.4
VS+ = VS-
2.2
T
A
= -40°C
OFFSET CURRENT (µA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
3
6
T
A
= +25°C
T
A
= +85°C
15
12
9
6
ERROR (%)
I
LOAD
FROM RS- TO RS+
40
V = 0V TO 0.5V
A
30
PSRR (%)
25
20
15
5V
OUT
GND
1µF
3
0
-3
-6
-9
-12
-15
I
LOAD
FROM RS+ TO RS-
V
5Ω
V = 0V TO 1V
V = 0mV TO 50mV
10
5
0
0.01
0.10
I
LOAD
(A)
1
10
0.01
0.10
1
10
100
1000
POWER-SUPPLY FREQUENCY (kHz)
9 12 15 18 21 24 27 30 33 36
V
RS+
(V)
MAX471
RS+ TO RS- RESISTANCE vs.
TEMPERATURE
MAX1471-07
MAX472
NO-LOAD OUTPUT ERROR vs.
SUPPLY VOLTAGE
MAX1471-08
MAX472
ERROR vs. SUPPLY VOLTAGE
V
RG1
-V
RG2
= 60mV,
RG1 = RG2 = 200Ω
1.00
ERROR (%)
T
A
= +85°C
0.90
T
A
= +25°C
MAX1471-09
40
38
RESISTANCE (mΩ)
36
3.0
2.5
2.0
I
OUT
(µA)
1.5
T
A
= +25°C
1.0
0.5
T
A
= -40°C
RG1 = RG2 = 0Ω
T
A
= +85°C
1.10
34
32
30
28
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
0.80
T
A
= -40°C
0
3
6
9 12 15 18 21 24 27 30 33 36
V
CC
(V)
0.70
3
6
9 12 15 18 21 24 27 30 33 36
V
CC
(V)
4
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
