MAX471/MAX472
Precision, High-Side
Current-Sense Amplifiers
4 _______________________________________________________________________________________
__________________________________________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.)
65
35
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
40
MAX1471-01
V
RS+
(V)
SUPPLY CURRENT (µA)
21 2415 189123 6 27 30 33 36
45
50
55
60
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
2.5
0
0.5
2.0
MAX1471-02
I
SHDN
(µA)
1.5
1.0
SHUTDOWN CURRENT vs.
SUPPLY VOLTAGE
V
RS+
(V)
21 2415 189123 6 27 30 33 36
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
4
-2
SIGN THRESHOLD vs.
SUPPLY VOLTAGE
-1
MAX1471-03
SIGN THRESHOLD (mA)
21 2415 189123 6 27 30 33 36
0
1
2
3
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
V
RS+
(V)
0.6
MAX1471-04
OFFSET CURRENT (µA)
MAX471
NO-LOAD OFFSET CURRENT vs.
SUPPLY VOLTAGE
V
RS+
(V)
21 2415 189123 6 27 30 33 36
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
VS+ = VS-
T
A
= -40°C
T
A
= +85°C
T
A
= +25°C
28
-40 80
TEMPERATURE (°C)
RESISTANCE (mΩ)
20
30
-20 0 60
40
MAX1471-07
MAX471
RS+ TO RS- RESISTANCE vs.
TEMPERATURE
32
34
36
38
40
-12
0.01 0.10
MAX471
ERROR vs. LOAD CURRENT
MAX471-05
I
LOAD
(A)
ERROR (%)
110
-15
-6
-9
-3
0
3
6
9
12
15
I
LOAD
FROM RS+ TO RS-
I
LOAD
FROM RS- TO RS+
40
0.01 10 1000
MAX471
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX471-06
POWER-SUPPLY FREQUENCY (kHz)
PSRR (%)
1 100
35
30
25
20
15
10
5
0
0.10
V = 0mV TO 50mV
V = 0V TO 1V
V = 0V TO 0.5V
I
LOAD
= 1A
5V
RS+
OUT
GND
RS–
A
1µF
5Ω
V
3.0
0
MAX472
NO-LOAD OUTPUT ERROR vs.
SUPPLY VOLTAGE
0.5
MAX1471-08
V
CC
(V)
I
OUT
(µA)
21 2415 189123 6 27 30 33 36
1.0
1.5
2.0
2.5
T
A
= +85°C
T
A
= -40°C
T
A
= +25°C
RG1 = RG2 = 0Ω
0.70
MAX1471-09
ERROR (%)
MAX472
ERROR vs. SUPPLY VOLTAGE
V
CC
(V)
21 2415 189123 6 27 30 33 36
V
RG1
-V
RG2
= 60mV,
RG1 = RG2 = 200Ω
0.80
0.90
1.00
1.10
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
