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| 型号： | MAX34406HETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP CURR SENSE QUAD 24TQFN |
| 标准包装： | 2,500 |
| 放大器类型： | 电流检测 |
| 电路数： | 4 |
| 输出类型： | 开路漏极 |
| -3db带宽： | 30kHz |
| 电流 - 输入偏压： | 200nA |
| 电压 - 输入偏移： | 100µV |
| 电流 - 电源： | 200µA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Maxim Integrated Products 9
MAX34406
Quad Current-Sense Amplifier
with Overcurrent Threshold Comparators
Efficiency and Power Dissipation
At high current levels, the I2R losses in RSENSE can be
significant. Take this into consideration when choosing
the resistor value and its power dissipation (wattage)
rating. Also, the sense resistor’s value might drift if it is
allowed to heat up excessively. The precision VOS of the
device allows the use of small sense resistors to reduce
power dissipation and reduce hot spots.
Kelvin Connections
Because of the high currents that flow through RSENSE,
take care to eliminate parasitic trace resistance from
causing errors in the sense voltage. Either use a four-
terminal current-sense resistor or use Kelvin (force and
sense) PCB layout techniques.
Minimizing Trace Resistance
PCB trace resistance from RSENSE to the INx+ inputs
contributes to gain error in the current-sense amplifiers.
Care should be taken to minimize this resistance (shown
trace resistance can be calculated as follows:
OUTx
TRC
R
G
R1 R
=
+
For example, assume a gain of 100V/V, as in the
Then every 10mI of PCB trace resistance adds -0.01%
gain error.
Optional Output Filter Capacitor
When designing a system that uses a sample-and-hold
stage in the ADC, the sampling capacitor momentarily
loads OUTx and causes a drop in the output voltage. If
sampling time is very short (less than a microsecond),
consider using a ceramic capacitor across OUTx and
GND to hold VOUTx constant during sampling. This also
decreases the small-signal bandwidth of the current-
sense amplifier and reduces noise at OUTx.
Input Filters
Some applications of current-sense amplifiers need to
measure currents accurately even in the presence of
both differential and common-mode ripple, as well as a
wide variety of input transient conditions. For example,
high-frequency ripple at the output of a switching buck or
boost regulator results in a common-mode voltage at the
device’s inputs. Alternatively, the fast load-current tran-
sients, when measuring at the input of a switching buck
or boost regulator, can cause high-frequency differential
sense voltages to occur at the device’s inputs, although
the signal of interest is the average DC value. Such high-
frequency differential sense voltages can result in a volt-
age offset at the device output.
The device allows a method of filtering to help improve
performance in the presence of input common-mode
voltage and input differential voltage transients. Figure 2
shows a differential input filter.
The capacitor CIN between INx+ and INx- along with the
resistor RIN between the sense resistor and INx- helps
filter against input differential voltages and prevents them
from reaching the device.
The corner frequency of this filter is determined by the
choice of RIN, CIN, and the value of the input resistance
at INx- (R1). See Table 1 for R1 values at the different
gain options.
The value of RIN should be chosen to minimize its effect
on the input offset voltage due to the bias current at INx-.
Figure 1. Input Trace Resistance
Figure 2. Differential Input Filter
RSENSE
INx+
GND
INx-
OUTx
RTRC
MAX34406
LOAD
RSENSE
CIN
INx+
GND
INx-
OUTx
RIN
MAX34406
LOAD
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX34406TETG+ | 功能描述:电流灵敏放大器 QUAD CURRENT-SENSE MONITOR 24L 25V 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 |
| MAX34406TETG+T | 制造商:Maxim Integrated Products 功能描述:QUAD CURRENT SENSE MONITOR 24L 25V TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:QUAD CURRENT SENSE MONITOR 24L 25V - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC OPAMP CURR SENSE 60KHZ 24TQFN |
| MAX34406WETG+ | 功能描述:电流灵敏放大器 QUAD CURRENT-SENSE MONITOR 24L 200V 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 |
| MAX34406WETG+T | 制造商:Maxim Integrated Products 功能描述:QUAD CURRENT SENSE MONITOR 24L 200V TRL - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC OPAMP CURR SENSE 60KHZ 24TQFN 制造商:Maxim Integrated Products 功能描述:Current Sense Amplifiers QUAD CURRENT-SENSE MONITOR 24L 200V |
| MAX34408ETE+ | 制造商:Maxim Integrated Products 功能描述:SMBUS DUAL CURRENT MONITOR - Bulk 制造商:Maxim Integrated Products 功能描述:IC TXRX |
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