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| 型号： | MAX4073TAXK+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURRENT SENSE SC70-5 |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 放大器类型： | 电流检测 |
| 电路数： | 1 |
| -3db带宽： | 1.8MHz |
| 电流 - 输入偏压： | 40µA |
| 电压 - 输入偏移： | 1000µV |
| 电流 - 电源： | 500µA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP（5 引线），SC-88A，SOT-353 |
| 供应商设备封装： | SC-70-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1387 (CN2011-ZH PDF) |
| 其它名称： | MAX4073TAXK+TDKR |
Detailed Description
The MAX4073 high-side current-sense amplifier fea-
tures a +2V to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current out of a battery as low as +2V and
also enables high-side current sensing at voltages
greater than the supply voltage (VCC).
The MAX4073 operates as follows: current from the
source flows through RSENSE to the load (Figure 1). Since
the internal-sense amplifier’s inverting input has high
impedance, negligible current flows through RG2
(neglecting the input bias current). Therefore, the
sense amplifier’s inverting-input voltage equals
VSOURCE - (ILOAD)(RSENSE). The amplifier’s open-loop
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
equals (ILOAD)(RSENSE). Since IRG1 flows through RG1,
IRG1 = (ILOAD)(RSENSE) / RG1. The internal current mirror
multiplies IRG1 by a current gain factor, β, to give
IRGD = β IRG1. Solving IRGD = β (ILOAD)(RSENSE)/
RG1. Assuming infinite output impedance, VOUT = (IRGD)
(RGD). Substituting in for IRGD and rearranging, VOUT =
β (RGD/RG1)(RSENSE ILOAD). The parts gain equals
β RGD/RG1. Therefore, VOUT = (GAIN) (RSENSE)
(ILOAD), where GAIN = 20V/V for MAX4073T, GAIN =
50V/V for MAX4073F, and GAIN = 100V/V for MAX4073H.
Set the full-scale output range by selecting RSENSE and
the appropriate gain version of the MAX4073.
Applications Information
Recommended Component Values
The MAX4073 senses a wide variety of currents with
different sense resistor values. Table 1 lists common
resistor values for typical operation of the MAX4073.
Choosing RSENSE
To measure lower currents more accurately, use a
large value for RSENSE. The larger value develops a
higher-sense voltage that reduces offset voltage errors
of the internal op amp. Typical sense voltages range
between 10mV and 150mV.
In applications monitoring very high currents, RSENSE
must be able to dissipate the I2R 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 maxi-
mum ratings (±5V).
If ISENSE has a large high-frequency component, mini-
mize the inductance of RSENSE. Wire-wound resistors
have the highest inductance, metal-film resistors are
MAX4073T/F/H
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
7
Maxim Integrated
Pin Description
PIN
SOT23
SC70
NAME
FUNCTION
1, 2
2
GND
Ground
33
VCC
Supply Voltage Input. Bypass to GND with a 0.1F capacitor.
4
RS+
Power-Side Connection to the External Sense Resistor
5
RS-
Load-Side Connection to the External Sense Resistor
6
1
OUT
Voltage Output. VOUT is proportional to VSENSE. Output impedance is approximately
12k.
RSENSE
VSOURCE
+2V TO +28V
+3V TO +28V
RGD = 12k
VOUT
IRG1
IRGD
ILOAD
RG1
RG2
RS-
RS+
OUT
GND
TO LOAD/BATTERY
VCC
CURRENT
MIRROR
A1
MAX4073T/F/H
Figure 1. Functional Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4074 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps |
| MAX4074__ESA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps |
| MAX4074__EUK- | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps |
| MAX4074ABESA | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4074ABEUK-T | 功能描述:运算放大器 - 运放 RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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