Low-Cost, Precision, High-Side
Current-Sense Amplifier
MAX4172
ABSOLUTE MAXIMUM RATINGS
V+, RS+, RS-,
PG
...................................................-0.3V to +36V
OUT ..............................................................-0.3V to (V+ + 0.3V)
Differential Input Voltage, V
RS+
- V
RS-
............................±700mV
Current into Any Pin..........................................................±50mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C) ..........................471mW
µMAX (derate 4.10mW/°C above +70°C) .....................330mW
Operating Temperature Range
MAX4172E_A ....................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +32V; RS+, RS- = 0V to 32V; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V+ = +12V, RS+ = 12V,
T
A
= +25°C.)
PARAMETER
Operating Voltage Range
Input Voltage Range
Supply Current
Input Offset Voltage
SYMBOL
V+
V
RS-
I
V+
V
OS
I
OUT
= 0mA
V+ = 12V, V
RS+
= 12V
V
RS+
≤
2.0V
Positive Input Bias Current
Negative Input Bias Current
Maximum V
SENSE
Voltage
Low-Level Current Error
V
SENSE
= 6.25mV, V+ = 12V, MAX4172ESA
V
RS+
= 12V (Note 1)
MAX4172EUA
MAX4172ESA,
T
A
= -40°C to 0°C
MAX4172EUA,
T
A
= -40°C to 0°C
MAX4172ESA,
T
A
= 0°C to +85°C
MAX4172EUA,
T
A
= 0°C to +85°C
T
A
= 0°C to +85°C
OUT Power-Supply
Rejection Ratio
OUT Common-Mode
Rejection Ratio
∆I
OUT
/
∆V+
3V
≤
V+
≤
32V, V
RS+
> 2.0V
0.2
0.03
I
RS+
I
RS-
V
RS+
> 2.0V, I
OUT
= 0mA
V
RS+
≤
2.0V, I
OUT
= 0mA
V
RS+
> 2.0V
V
RS+
≤
2.0V
0
-325
0
-650
150
175
±8.0
±15
±20
±50
µA
±10
±15
µA/V
µA/V
50
MAX4172ESA
MAX4172EUA
CONDITIONS
MIN
3
0
0.8
±0.1
±0.2
4
27
42.5
42.5
85
85
µA
µA
mV
µA
TYP
MAX
32
32
1.6
±0.75
±1.6
mV
UNITS
V
V
mA
Output Current Error
V
SENSE
= 100mV, V+ = 12V,
V
RS+
= 12V
∆I
OUT
/
∆V
RS+
2.0V < V
RS+
< 32V
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
