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| 型号： | MAX4372FESA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP GAIN +50V/V PREC 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 200kHz |
| 电流 - 输入偏压： | 2µA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 30µA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
_______________Detailed Description
The MAX4372 high-side current-sense amplifier fea-
tures a 0 to 28V input common-mode range that is inde-
pendent 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 (VCC).
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 VIN - VSENSE. A1 forces its positive terminal to
match its negative terminal; therefore, the voltage
across RG1 (VIN - V1-) equals VSENSE. This creates a
current to flow through RG1 equal to VSENSE / RG1. 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:
IM =
β VSENSE / RG1
A2’s positive terminal presents high impedance, so this
current flows through RGD, with the following result:
V2+ = RGD
β VSENSE / RG1
R1 and R2 set the closed-loop gain for A2, which ampli-
fies V2+, yielding:
VOUT = RGD
β VSENSE / RG1 (1 + R2 / R1)
The gain of the device equals:
VOUT
= RGD
β (1 + R2 / R1) / RG1
VSENSE
__________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 RSENSE
Given the gain and maximum load current, select RSENSE
such that VOUT does not exceed VCC - 0.25V or 10V. To
measure lower currents more accurately, use a high
value for RSENSE. 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
RSENSE is able to dissipate its own I
2R 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.
Low-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
MAX4372T/F/H
GND
TO
LOAD
VIN
0 TO 28V
2.7V
TO
28V
R1
RGD
RG2
100k
Ω
RS+
RS-
RG1
100k
Ω
R2
OUT
V2+
V1+
V1-
V2-
VCC
RSENSE
ILOAD
IM
VSENSE
CURRENT
MIRROR
A1
A2
Pin/Bump Description
1
3
Ground
2
4
Output Voltage. VOUT is proportional to the magnitude of VSENSE
(VRS+ - VRS-).
A2
A3
SO
FUNCTION
SOT23
UCSP
3
1
Supply Voltage. Use at least a 0.1F capacitor to decouple VCC from fast
transients.
4
8
Power Connection to the External Sense Resistor
A1
B1
5
6
Load-Side Connection to the External Sense Resistor
—
2, 5, 7
No Connection. Not internally connected.
B3
—
GND
OUT
NAME
VCC
RS+
RS-
N.C.
PIN
BUMP
Figure 1. Functional Diagram
6
Maxim Integrated
MAX4372T/F/H
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4372FESA+ | 功能描述:电流灵敏放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4372FESA+T | 功能描述:电流灵敏放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4372FESA-T | 功能描述:电流灵敏放大器 uPower High-Side Current-Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4372FEUK | 制造商:Maxim Integrated Products 功能描述:UCSP/SOT23, MICROPOWER, HIGH-SIDE CURRENT-SENSE AMP - Bulk |
| MAX4372FEUK+ | 制造商:Maxim Integrated Products 功能描述:SP AMP CURRENT SENSE AMP SGL 28V 5PIN SOT-23 - Bulk |
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