Single/Dual/Quad High-Side Current-Sense
Amplifiers with Internal Gain
MAX4376/MAX4377/MAX4378
Table 1. Recommended Component Values
FULL-SCALE LOAD
CURRENT, I
LOAD
(A)
0.1
CURRENT-SENSE
RESISTOR, R
SENSE
(mΩ)
1000
GAIN (+V/V)
20
50
100
1
100
20
50
100
5
20
20
50
100
10
10
20
50
100
R
SENSE
RS+
I
RG1
+3V TO +28V
V
CC
R
G1
R
G2
I
LOAD
TO LOAD BATTERY
FULL-SCALE OUTPUT VOLTAGE
(FULL-SCALE V
SENSE
= 100 mV),
V
OUT
(V)
2.0
5.0
10.0
2.0
5.0
10.0
2.0
5.0
10.0
2.0
5.0
10.0
V
SOURCE
0 TO +28V
R
SENSE
RS-
BATTERY
+3V TO +28V
V
CC
RS1+
SYSTEM
AND
CHARGER
A1
RS1-
OUT1
MAX4376
CURRENT
MIRROR
I
RGD
RGD
GND
OUT
V
OUT
A
V
= 2, 5,
OR 10
OUT
MAX4377
RS2-
OUT2
RS2+
Figure 1. Functional Diagram
monitor. This is useful for implementing either smart
battery packs or fuel gauges.
Current Source Circuit
Figure 3 shows a block diagram using the MAX4376
with a switching regulator to make a current source.
Figure 2. Bidirectional Current Monitor
8
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