MAX4372 Maxim, MAX4372 Datasheet - Page 7

• Manufacturer Part Number: MAX4372
• Description: Low-Cost / SOT23 / Micropower / High-Side Current-Sense Amplifier with Voltage Output
• Manufacturer: Maxim

TRANSISTOR COUNT: 225
Table 1. Recommended Component Values
If the cost of R
critical, use the alternative solution shown in Figure 2.
This solution uses copper PC board traces to create a
sense resistor. The resistivity of a 0.1-inch-wide trace of
2-ounce copper is about 30mΩ/ft. The resistance tem-
perature coefficient of copper is fairly high (approxi-
mately 0.4%/°C), so systems that experience a wide
temperature variance must compensate for this effect.
In addition, self-heating will introduce a nonlinearity
error. Do not exceed the maximum power dissipation of
the copper trace.
For example, the MAX4372T (with a maximum load cur-
rent of 10A and an R
V
R
inch-wide copper trace.
SENSE
SENSE
FULL-SCALE LOAD
Current-Sense Amplifier with Voltage Output
, in this case, requires about 2 inches of 0.1-
of 50mV that yields a maximum V
CURRENT,
I
Using a PC Board Trace as R
LOAD
0.1
10
1
5
SENSE
(A)
Low-Cost, SOT23, Micropower, High-Side
_______________________________________________________________________________________
SENSE
is an issue and accuracy is not
of 5mΩ) creates a full-scale
Chip Information
CURRENT-SENSE
R
RESISTOR,
SENSE
1000
100
20
10
OUT
(mΩ)
SENSE
of 1V.
Figure 2. Connections Showing Use of PC Board
0.3in COPPER
INPUT
GAIN
(V/V)
100
100
100
100
20
50
20
50
20
50
20
50
RS+
RS-
0.1in COPPER
MAX4372T/F/H
R
V
SENSE
SENSE
VOLTAGE (FULL-SCALE
FULL-SCALE OUTPUT
V
GND
OUT
V
CC
SENSE
V
OUT
LOAD/BATTERY
0.3in COPPER
10.0
10.0
10.0
10.0
2.0
5.0
2.0
5.0
2.0
5.0
2.0
5.0
= 100mV),
+2.7V TO +28V
(V)
7