Electrical characteristics (continued) – Rainbow Electronics MAX9937 User Manual
Page 3
MAX9937
Automotive Current-Sense Amplifier
with Reverse-Battery Protection
_______________________________________________________________________________________
3
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Maximum Output Current
I
OUT
R
RSN
= 500
Ω, R
RSP
= 0, V
OUT
= 0
2
7.5
22
mA
V
SENSE
= 500mV,
ΔI
OUT
≤ 1%
-0.1
V
CC
+
0.1
Output-Voltage Compliance
(Note 6)
V
BAT
= 4V, V
SENSE
= 0.1V,
ΔI
OUT
≤ 2%
-0.1
V
RSP
-
0.15
V
RSP
-
0.8
V
Output-Voltage High
V
OH
V
BAT
= 4V, V
SENSE
= +500mV,
V
OH
= V
BAT
- V
OUT
0.4
1.2
V
Output-Voltage Low
V
OL
V
BAT
= 4V, V
SENSE
= -100mV
2
20
mV
AC CHARACTERISTICS
3dB Large-Signal Bandwidth
BW
V
SENSE
= 137.5mV
DC
+ 225mV
P-P
250
kHz
3dB Small-Signal Bandwidth
350
kHz
Settling Time to 1%
t
S
5
µs
Input-Voltage Noise
e
n
f = 1kHz
28
nV/
√Hz
Input Current Noise
I
n
f = 1kHz
1
pA/
√Hz
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
BAT
= V
RS+
= 12V, V
SENSE
= (V
RS+
- V
RS-
) = 0, R
RSP
= R
RSN
= 500
Ω, R
OUT
= 10k
Ω, T
A
= -40°C to +125°C. Typical
values are at T
A
= +25°C, unless otherwise noted. See the
Typical Application Circuit.) (Note 2)
Note 2: All devices are 100% production tested at T
A
= +25°C. Temperature limits are guaranteed by design.
Note 3: Gain and offset voltage are calculated based on two point measurements: V
SENSE1
= 5mV and V
SENSE2
= 200mV.
Note 4: Input bias current I
B+
and I
B-
refers to the internal op amp’s inputs (inverting and noninverting) so that I
B-
= I
RSN
and
I
B+
= I
RSP
- I
OUT
.
Note 5: The gain is set by the external resistors R
RSP
and R
OUT
. See the
Typical Application Circuit.
Note 6: V
RSP
= V
BAT
- V
SENSE
- V
OS
- (R
RSN
x I
B-
).
I
I
I
I
I
I
B
B
B
B
B
B
=
+
=
+
+
-
-
-
2
Δ
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