Precision, High-Side
Current-Sense Amplifiers
ELECTRICAL CHARACTERISTICS—MAX472
(V
CC
= +3V to +36V, RG1 = RG2 = 200Ω, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Supply Voltage
Supply Current
Input Offset Voltage
(Note 2)
Input Bias Current
Input Bias-Current Matching
OUT Current Accuracy
No-Load OUT Error
Low-Level OUT Error
Power-Supply Rejection Ratio
SIGN Threshold (V
SENSE
required to switch SIGN)
SIGN Output Leakage Current
SIGN Output Sink Current
Shutdown Supply Current
SHDN Input Low Voltage
SHDN Input Low Current
SHDN Input High Voltage
SHDN Input High Current
OUT Output Voltage Range
OUT Output Resistance
OUT Rise, Fall Time
OUT Settling Time to 1%
of Final Value
Maximum Output Current
I
CC(SHDN)
V
IL
I
IL
V
IH
I
IH
V
OUT
R
OUT
t
R
, t
F
t
s
I
OUT
I
OUT
= 1.5mA
V
SENSE
= 5mV to 150mV, R
OUT
= 2kΩ,
C
OUT
= 50pF, 10% to 90%
V
SENSE
= 5mV to 150mV, R
OUT
= 2kΩ,
C
OUT
= 50pF
1.5
V
SHDN
= 2.4V
0
1
3
4
15
V
SHDN
= 0V
2.4
1.0
V
CC
- 1.5
PSRR
SYMBOL
V
CC
I
CC
V
OS
I
RG1
, I
RG2
I
OS
I
RG
/I
OUT
I
RG1
- I
GR2
V
SENSE
= 100mV,
V
CC
= 10V (Note 3)
V
CC
= 10V,
V
SENSE
= 0V
V
CC
= 10V,
V
SENSE
= 3mV
MAX472C
MAX472E
MAX472C
MAX472E
MAX472C
MAX472E
MAX472C
MAX472E
0.1
1.5
18.0
0.3
1.0
60
60
I
LOAD
= 0A, excludes I
SIGN
; V
CC
= 3V to 20V
MAX472C
MAX472E
20
±0.4
CONDITIONS
MIN
3
20
TYP
MAX
36
48
120
140
35
±3.0
±2
±2.5
2.5
3
±2.5
±3.0
0.1
120
140
1.0
UNITS
V
µA
µV
µA
µA
%
µA
µA
%/V
µV
µA
mA
µA
V
µA
V
µA
V
MΩ
µs
µs
mA
MAX471/MAX472
3V
≤
V
CC
≤
36V, V
SENSE
= 100mV
V
CC
= 10V
V
SIGN
= 36V
V
SIGN
= 0.3V
V
SHDN
= 2.4V; V
CC
= 3V to 20V
Note 2:
V
OS
is defined as the input voltage (V
SENSE
) required to give minimum I
OUT
.
Note 3:
V
SENSE
is the voltage across the sense resistor.
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3
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
