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參數(shù)資料
| 型號： | MAX472ESA+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 13/13頁 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR-SENSE HI-SIDE 8-SOIC |
| 標準包裝： | 100 |
| 放大器類型： | 電流檢測 |
| 電路數(shù)： | 1 |
| 電流 - 輸入偏壓： | 20µA |
| 電壓 - 輸入偏移： | 140µV |
| 電流 - 電源： | 20µA |
| 電流 - 輸出 / 通道： | 1.5mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
MAX471/MAX472
for current summing. A single scaling resistor is
required when summing OUT currents from multiple
devices (Figure 3). Current can be integrated by con-
necting OUT to a capacitive load.
SIGN Output
The current at OUT indicates magnitude. The SIGN out-
put indicates the current’s direction. Operation of the
SIGN comparator is straightforward. When Q1 (Figures
1 and 2) conducts, the output of A1 is high while A2’s
output is zero. Under this condition, a high SIGN output
indicates positive current flow (from RS+ to RS-). In bat-
tery-operated systems, this is useful for determining
whether the battery is charging or discharging. The
SIGN output may not correctly indicate if the load cur-
rent is such that IOUT is less than 3.5A. The MAX471’s
SIGN output accurately indicates the direction of cur-
rent flow for load currents greater than 7mA.
SIGN is an open-collector output (sinks current only),
allowing easy interface with logic circuits powered from
any voltage. Connect a 100k
pull-up resistor from
SIGN to the logic supply. The convention chosen for
the polarity of the SIGN output ensures that it draws no
current when the battery is being discharged. If current
direction is not needed, float the SIGN pin.
Shutdown
When SHDN is high, the MAX471/MAX472 are shut
down and consume less than 18A. In shutdown mode,
SIGN is high impedance and OUT turns off.
__________Applications Information
MAX471
The MAX471 obtains its power from the RS- pin. This
includes MAX471 current consumption in the total sys-
tem current measured by the MAX471. The small drop
across RSENSE does not affect the MAX471’s perfor-
mance.
Resistor Selection
Since OUT delivers a current, an external voltage gain-
setting resistor (ROUT to ground) is required at the OUT
pin in order to get a voltage. RSENSE is internal to the
MAX471. RG1 and RG2 are factory trimmed for an out-
put current ratio (output current to load current) of
500A/A. Since they are manufactured of the same
material and in very close proximity on the chip, they
provide a high degree of temperature stability. Choose
ROUT for the desired full-scale output voltage up to RS-
- 1.5V (see the
Current Output section).
Precision, High-Side
Current-Sense Amplifiers
8
_______________________________________________________________________________________
MAX471
RS+
RS-
SIGN
OUT
GND
TO LOAD/
CHARGER
3V
TO
36V
MAX471
RS+
RS-
SIGN
OUT
GND
1k
100k
LOGIC
SUPPLY
VOUT
3V
TO
36V
RSENSE
1
2
3
4
8
7
6
5
MAX472
RG2
100k
RG1
POWER
SOURCE
OR
BATTERY
TO LOAD/CHARGER
RG1
N.C.
SHDN
SIGN
OUT
VCC
GND
RG2
ROUT
LOGIC
SUPPLY
Figure 3. Paralleling MAX471s to Sense Higher Load Current
Figure 4. MAX472 Standard Application Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX472ESA/GH9 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX472ESA/PR | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX472ESA+ | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX472ESA+T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| MAX472ESA-T | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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