MAX4378 Maxim, MAX4378 Datasheet - Page 8

• Manufacturer Part Number: MAX4378
• Description: The MAX4376/MAX4377/MAX4378 single, dual, and quad precision high-side current-sense amplifiers are available in space-saving packages
• Manufacturer: Maxim

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