Using a PC Board Trace as RSENSE If the cost of RSENSE <" />
參數(shù)資料
型號: MAX4372TEBT+T
廠商: Maxim Integrated Products
文件頁數(shù): 9/11頁
文件大?。?/td> 0K
描述: IC AMP CURRENT SENSE 5-UCSP
產(chǎn)品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 1
放大器類型: 電流檢測
電路數(shù): 1
-3db帶寬: 275kHz
電流 - 輸入偏壓: 2µA
電壓 - 輸入偏移: 300µV
電流 - 電源: 30µA
電壓 - 電源,單路/雙路(±): 2.7 V ~ 28 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 5-WFBGA,CSPBGA
供應商設備封裝: 5-UCSP(1.52x1.05)
包裝: 標準包裝
產(chǎn)品目錄頁面: 1389 (CN2011-ZH PDF)
其它名稱: MAX4372TEBT+TDKR
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.
Table 1. Recommended Component Values
FULL-SCALE LOAD
CURRENT,
ILOAD (A)
GAIN
(V/V)
CURRENT-SENSE
RESISTOR,
RSENSE (mΩ)
2.0
FULL-SCALE OUTPUT
VOLTAGE (FULL-SCALE
VSENSE = 100mV),
VOUT (V)
5.0
10.0
0.1
1000
20
100
50
2.0
100
50
5.0
10.0
1
100
20
2.0
100
50
5.0
2.0
100
50
5.0
10.0
5
20
10.0
10
20
0.1in COPPER
0.3in COPPER
INPUT
LOAD/BATTERY
VCC
VSENSE
RSENSE
GND
2.7V TO 28V
RS+
RS-
OUT
MAX4372T/F/H
Figure 2. Connections Showing Use of PC Board
Low-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Maxim Integrated
7
MAX4372T/F/H
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