Datasheet

(V+ = +3V to +32V; V
RS+
, V
RS-
= 0 to 32V; T
A
= T
MIN
to T
MAX
; unless otherwise noted. Typical values are at V+ = +12V,
V
RS+
= 12V, T
A
= +25°C.)
Note 1: 6.25mV = 1/16 of typical full-scale sense voltage (C/16).
Note 2: Valid operation of the MAX4172 is guaranteed by design when PG is low.
(V+ = +12V, V
RS+
= 12V, R
OUT
= 1kΩ, T
A
= +25°C, unless otherwise noted.)
Electrical Characteristics (continued)
Typical Operating Characteristics
1.0
0.9
0
0 10
OUTPUT ERROR
vs. SUPPLY VOLTAGE
0.3
0.4
0.2
0.1
0.8
0.7
MAX4172-02
V+ (V)
ERROR (%)
20
30
0.6
0.5
40
V
SENSE
= 100mV
T
A
= -40°C
T
A
= +105°C
T
A
= +85°C
T
A
= +25°C
8
6
-6
0
10
C/16 LOAD OUTPUT ERROR
vs. SUPPLY VOLTAGE
-4
-2
4
2
MAX4172-03
V+ (V)
ERROR (%)
20 30
0
40
T
A
= +25°C
V
SENSE
= 6.25mV
T
A
= -40°C
T
A
= +85°C
T
A
= +105°C
I
OUT
= 0mA
1050
950
450
0 10
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
650
550
850
MAX4172-01
V+ (V)
QUIESCENT SUPPLY CURRENT (μA)
20
30
750
40
I
OUT
= 0mA
T
A
= +105°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Maximum Output Voltage
(OUT)
I
OUT
≤ 1.5mA V+ - 1.2 V
Bandwidth
V
SENSE
= 100mV 800
kHz
V
SENSE
= 6.25mV (Note 1) 200
Maximum Output Current I
OUT
1.5 1.75 mA
Transconductance G
m
G
m
= I
OUT
/(V
RS+
- V
RS-
),
V
SENSE
= 100mV, V
RS+
> 2.0V
T
A
= 0°C to +105°C 9.8 10 10.2
mA/V
T
A
= -40°C to 0°C 9.7 10 10.3
V+ Threshold for PG
Output Low (Note 2)
V+ rising 2.77
V
V+ falling 2.67
PG Output Low Voltage V
OL
I
SINK
= 1.2mA, V+ = 2.9V, T
A
= +25°C 0.4 V
Leakage Current into PG V+ = 2.5V, T
A
= +25°C 1 µA
Power-O󰀨 Input Leakage
Current (RS+, RS-)
V+ = 0V, V
RS+
= V
RS-
= 32V 0.1 1 µA
OUT Rise Time V
SENSE
= 0 to 100mV, 10% to 90% 400 ns
OUT Fall Time V
SENSE
= 100mV to 0mV, 90% to 10% 800 ns
OUT Settling Time to 1% V
SENSE
= 5mV to 100mV
Rising 1.3
µs
Falling 6
OUT Output Resistance V
SENSE
= 150mV 20 MΩ
MAX4172 Low-Cost, Precision, High-Side
Current-Sense Amplier
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