MAX4372HESA-T 查看數據表（PDF） - Maxim Integrated
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MAX4372HESA-T
Maxim Integrated
MAX4372HESA-T Datasheet PDF : 11 Pages
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MAX4372T/F/H
Low-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Table 1. Recommended Component Values
FULL-SCALE LOAD
CURRENT,
ILOAD (A)
CURRENT-SENSE
RESISTOR,
RSENSE (mΩ)
0.1
1000
1
100
5
20
10
10
GAIN
(V/V)
20
50
100
20
50
100
20
50
100
20
50
100
FULL-SCALE OUTPUT
VOLTAGE (FULL-SCALE
VSENSE = 100mV),
VOUT (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
Using a PC Board Trace as RSENSE
If the cost of RSENSE is an issue and accuracy is not
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 RSENSE of 5mΩ) creates a full-scale
VSENSE of 50mV that yields a maximum VOUT of 1V.
RSENSE, in this case, requires about 2 inches of 0.1-
inch-wide copper trace.
UCSP Applications Information
For the latest application details on UCSP construction,
dimensions, tape carrier information, printed circuit
board techniques, bump-pad layout, and recommend-
ed reflow temperature profile, as well as the latest infor-
mation on reliability testing results, go to the Maxim's
website at www.maxim-ic.com/ucsp to find the
Application Note: UCSP—A Wafer-Level Chip-Scale
Package.
INPUT
0.3in COPPER
RSENSE
0.1in COPPER
VSENSE
LOAD/BATTERY
0.3in COPPER
RS+
VCC
MAX4372T/F/H
RS-
OUT
GND
2.7V TO 28V
Figure 2. Connections Showing Use of PC Board
Maxim Integrated
7
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