MAX4173 Maxim, MAX4173 Datasheet - Page 8
MAX4173
Manufacturer Part Number
MAX4173
Description
The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package
Manufacturer
Maxim
Datasheet
1.MAX4173.pdf
(10 pages)
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amp’s supply voltage range should be at least as high
as any voltage the system may encounter.
The percent error introduced by output loading is
determined with the following formula:
where R
Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier
Table 1. Recommended Component Values
Figure 2. MAX4173 Connections Showing Use of PC Board
8
FULL-SCALE LOAD CURRENT
_______________________________________________________________________________________
0.3 in. COPPER
INPUT
%
LOAD
ERROR
I
LOAD
is the external load applied to OUT.
0.1
10
1
5
=
(A)
+
100
RS+
0.1 in. COPPER
MAX4173T
R
V
⎛
⎜
⎝
SENSE
SENSE
GND
12k
Ω +
RS-
R
OUT
V
CC
LOAD
_
R
LOAD
CURRENT-SENSE RESISTOR
+3V TO +28V
LOAD/BATTERY
0.3 in. COPPER
0.1µF
−
R
1
SENSE
⎞
⎟
⎠
1000
100
20
10
(mΩ Ω )
Figure 3 shows a block diagram using the MAX4173
with a switching regulator to make a current source.
Figure 3. Current Source
V
IN
REGULATOR
SWITCHING
LOW-COST
GAIN
100
100
100
100
50
50
50
50
20
20
20
20
0 TO +28V
0.1µF
+3V TO +28V
FULL-SCALE OUTPUT VOLTAGE
(FULL-SCALE V
Current Source Circuit
RS+
OUT
V
CC
MAX4173
V
V
R
GND
SENSE
SENSE
OUT
10.0
10.0
10.0
10.0
2.0
5.0
5.0
2.0
5.0
2.0
5.0
2.0
SENSE
(V)
RS-
= 100mV)
I
LOAD
BATTERY
LOAD/