Linear LT6105放大器应用方案

44V，而失调电压则只有300uV。广泛应用在高边或低边电流检测，电池监视，汽车电子，功率管理以及手提测试测量系统。本文介绍了LT6105的主要性能，方框图以各种典型的应用。

LT6105: High Side Current Sense Amplifier Features Input Range from –0.3V to 44V & 300uV Offset
The LT®6105 is a micropower, precision current sense amplifier with a very wide input common mode range. The LT6105 monitors unidirectional current via the voltage across an external sense resistor. The input common mode range extends from –0.3V to 44V, with respect to the negative supply voltage (V–). This allows the LT6105 to operate as a high side current sense monitor or a low side current sense monitor. It also allows the LT6105 to monitor current on a negative supply voltage, as well as continuously monitor a battery from full charge to depletion. The inputs of LT6105 can withstand differential voltages up to ±44V, which makes it ideal for  onitoring a fuse or MOSFET switch.
Gain is confi gured with external resistors from 1V/V to 100V/V. The input common mode rejection and power supply rejection are in excess of 100dB and the input offset voltage is less than 300μV. A minimum slew rate of 2V/μs
ensures fast response to unexpected current changes.
The LT6105 can operate from an independent power supply of 2.85V to 36V and draws only 150μA. When V+ is powered down, the sense pins are biased off. This prevents loading of the monitored circuit, irrespective of the sense voltage. The LT6105 is available in a 6-lead DFN and 8-lead MSOP package.

主要特性：
n Very Wide, Over-the-Top®, Input Common Mode Range
- Extends 44V Above V– (Independent of V+)
- Extends –0.3V Below V–
n Wide Power Supply Range: 2.85V to 36V
n Input Offset Voltage: 300μV Maximum
n Gain Accuracy: 1% Max
n Gain Confi gurable with External Resistors
n Operating Current: 150μA
n Slew Rate: 2V/μs
n Sense Input Current When Powered Down: 1nA
n Full-Scale Output Current: 1mA Minimum
n Operating Temperature Range –40°C to 125°C
n Available in 2mm 3mm DFN and 8-Lead MSOP
Packages

应用：
n High Side or Low Side Current Sensing
n Current Monitoring on Positive or Negative Supply Voltages
n Battery Monitoring
n Fuse/MOSFET Monitoring
n Automotive
n Power Management
n Portable Test/Measurement Systems



图1。LT6105方框图



图2。LT6105典型应用电路图



图3。最简化的电磁螺线管驱动器



图4。和图3 相似的电路，但电磁螺线管接地