Datasheet

MAX9938
1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
_______________________________________________________________________________________ 3
0
10
5
20
15
25
30
-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4
INPUT OFFSET VOLTAGE HISTOGRAM
MAX9938 toc01
INPUT OFFSET VOLTAGE (mV)
N (%)
0
10
5
20
15
25
30
-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4
GAIN ERROR HISTOGRAM
MAX9938 toc02
GAIN ERROR (%)
N (%)
SUPPLY CURRENT
vs. TEMPERATURE
MAX9938 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
10-15 35 60
0.4
0.2
0.6
0.8
1.0
1.2
1.4
28V
3.6V
1.8V
0
-40 85
INPUT OFFSET
vs. COMMON-MODE VOLTAGE
MAX9938 toc04
SUPPLY VOLTAGE (V)
INPUT OFFSET (μV)
252010515
-50
-45
-40
-35
-30
-55
030
INPUT OFFSET
vs. TEMPERATURE
MAX9938 toc05
INPUT OFFSET (μV)
20
10
30
40
50
60
0
TEMPERATURE (°C)
10-15 35 60-40 85
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
MAX9938 toc06
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
15 2010 30525
1.0
0.8
0.6
0.4
0.2
1.2
1.4
0
0
Typical Operating Characteristics
(V
RS+
= V
RS-
= 3.6V, T
A
= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(V
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: V
OUT
= 0. I
CC
is the total current into RS+ plus RS- pins.
Note 3: V
OS
is extrapolated from measurements for the gain-error test.
Note 4: Gain error is calculated by applying two values of V
SENSE
and calculating the error of the slope vs. the ideal:
Gain = 25, V
SENSE
is 20mV and 120mV.
Gain = 50, V
SENSE
is 10mV and 60mV.
Gain = 100, V
SENSE
is 5mV and 30mV.
Gain = 200, V
SENSE
is 2.5mV and 15mV.
Note 5: The device is stable for any external capacitance value.
Note 6: V
OH
is the voltage from V
RS-
to V
OUT
with V
SENSE
= 3.6V/gain.