MAX4173F Maxim, MAX4173F Datasheet - Page 8

• Manufacturer Part Number: MAX4173F
• Description: The MAX4173 low-cost, precision, high-side current-sense amplifier is available in a tiny SOT23-6 package
• Manufacturer: Maxim

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/