Datasheet

MAX4172
Low-Cost, Precision, High-Side
Current-Sense Amplifier
3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(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.)
1000
950
500
010
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
600
650
550
900
850
800
MAX4172-01
V+ (V)
SUPPLY CURRENT (µA)
20
30
750
700
40
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
I
OUT
= 0mA
0.5
0.4
-0.5
010
OUTPUT ERROR
vs. SUPPLY VOLTAGE
-0.3
-0.4
-0.2
0.3
0.2
0.1
MAX4172-03
V+ (V)
ERROR (%)
20 30
0
-0.1
40
T
A
= +25°C
T
A
= +85°C
T
A
= -40°C
V
SENSE
= 100mV
1.5
1.0
-3.0
010
C/16 LOAD OUTPUT ERROR
vs. SUPPLY VOLTAGE
-2.0
-1.5
-2.5
0.5
0
MAX4172-02
V+ (V)
ERROR (%)
20
30
-0.5
-1.0
40
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
V
SENSE
= 6.25mV
__________________________________________Typical Operating Characteristics
(V+ = +12V, V
RS+
= 12V, R
OUT
= 1kΩ, T
A
= +25°C, unless otherwise noted.)
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.
I
OUT
≤ 1.5mA
CONDITIONS
VV+ - 1.2
Maximum Output Voltage
(OUT)
UNITSMIN TYP MAXSYMBOLPARAMETER
V+ = 2.5V, T
A
= +25°C
I
SINK
= 1.2mA, V+ = 2.9V, T
A
= +25°C
µA1
Leakage Current into PG
V0.4V
OL
PG Output Low Voltage
V
SENSE
= 5mV to 100mV
V
SENSE
= 0 to 100mV, 10% to 90%
µs
6
OUT Settling Time to 1%
1.3
ns400OUT Rise Time
V
SENSE
= 150mV MΩ20OUT Output Resistance
V
SENSE
= 100mV to 0mV, 90% to 10% ns800OUT Fall Time
Rising
Falling
V+ = 0V, V
RS+
= V
RS-
= 32V µA0.1 1
Power-Off Input Leakage
Current (RS+, RS-)
V
SENSE
= 100mV
kHz
800
Bandwidth
G
m
= I
OUT
/(V
RS+
- V
RS-
),
V
SENSE
= 100mV, V
RS+
> 2.0V
mA/V
9.8 10 10.2
G
m
Transconductance
mA1.5 1.75I
OUT
Maximum Output Current
V+ rising
V
2.77
V+ Threshold for PG Output
Low (Note 2)
V
SENSE
= 6.25mV (Note 1)
T
A
= 0°C to +85°C
V+ falling 2.67
T
A
= -40°C to 0°C 9.7 10 10.3
200