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參數(shù)資料
| 型號(hào)： | MAX4372T |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output |
| 中文描述： | 低成本、UCSP/SOT23封裝、微功耗、高邊電流檢測(cè)放大器，帶有電壓輸出 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 111K |
| 代理商： | MAX4372T |
_______________Detailed Description
The MAX4372 high-side current-sense amplifier fea-
tures a 0 to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current flow out of a battery in deep dis-
charge, and also enables high-side current sensing at
voltages far in excess of the supply voltage (V
CC
).
Current flows through the sense resistor, generating a
sense voltage (Figure 1). Since A1’s inverting input is
high impedance, the voltage on the negative terminal
equals V
IN
- V
SENSE
. A1 forces its positive terminal to
match its negative terminal; therefore, the voltage
across R
G1
(V
IN
- V1-) equals V
SENSE
. This creates a
current to flow through R
G1
equal to V
SENSE
/ R
G1
. The
transistor and current mirror amplify the current by a
factor of
β
. This makes the current flowing out of the
current mirror equal to:
I
M
=
β
V
SENSE
/ R
G1
A2’s positive terminal presents high impedance, so this
current flows through R
GD
, with the following result:
V
2+
= R
GD
β
·
V
SENSE
/ R
G1
R1 and R2 set the closed-loop gain for A2, which
amplifies V
2+
, yielding:
V
OUT
= R
GD
·
β
·
V
SENSE
/ R
G1
(1 + R2 / R1)
The gain of the device equals:
V
OUT
= R
GD
·
β
(1 + R2 / R1) / R
G1
V
SENSE
__________Applications Information
Recommended Component Values
The MAX4372 operates over a wide variety of current
ranges with different sense resistors. Table 1 lists com-
mon resistor values for typical operation of the
MAX4372.
Choosing R
SENSE
Given the gain and maximum load current, select
R
SENSE
such that V
CC
- V
OUT
does not exceed +0.25V
and V
OUT
does not exceed +10V. To measure lower
currents more accurately, use a high value for R
SENSE
.
A higher value develops a higher sense voltage, which
overcomes offset voltage errors of the internal current
amplifier.
In applications monitoring very high current, ensure
R
SENSE
is able to dissipate its own I
2
R losses. If the
resistor’s rated power dissipation is exceeded, its value
may drift or it may fail altogether, causing a differential
voltage across the terminals in excess of the absolute
maximum ratings.
M
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
6
_______________________________________________________________________________________
MAX4372T/F/H
GND
TO
LOAD
V
0 TO +28V
+2.7V
TO
+28V
R1
RGD
R
G2
RS+
RS-
RG1
R2
OUT
V2+
V1+
V1-
V2-
V
CC
R
SENSE
I
LOAD
I
M
V
SENSE
CURRENT
MIRROR
A1
A2
Pin Description
1
2
3
4
5
—
3
4
1
8
6
Ground
Output Voltage. V
OUT
is proportional to the magnitude of V
SENSE
(V
RS+
- V
RS-
).
Supply Voltage
Power Connection to the External Sense Resistor
Load-Side Connection to the External Sense Resistor
No Connection. Not internally connected.
PIN
GND
OUT
V
CC
RS+
RS-
N.C.
SO
FUNCTION
SOT23-5
NAME
2, 5, 7
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4372TEBT | 制造商:Maxim Integrated Products 功能描述:UCSP/SOT23, MICROPOWER, HIGH-SIDE CURRENT-SENSE AMP - Rail/Tube |
| MAX4372TEBT+ | 制造商:Maxim Integrated Products 功能描述:SP AMP CURRENT SENSE AMP SGL 28V 6UCSP - Rail/Tube |
| MAX4372TEBT+T | 功能描述:電流靈敏放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4372TEBT+TG45 | 功能描述:電流靈敏放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補(bǔ)償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel |
| MAX4372TEBT-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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
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