凌特公司（Linear）推出的IEEE802.3af以太网供电（PoE）控制器LTC4267,采用3mm×5mmDFN封装,具有一个集成开关稳压器,并具有25kW的片上特征电阻和分级电流源。其内部100V功率MOSFET可对来自长电缆的感应电压尖峰提供防护,同时低泄漏的特性可防止25kW特征电阻出现故障。适用于数字VoIP电话、网络无线接入点、监控摄像机或要求功率低于13W的以太网小型设备。 

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

  凌特公司（Linear）推出的IEEE 802.3af 以太网供电（PoE）控制器 LTC4267,采用3mm × 5mm DFN 封装,具有一个集成开关稳压器,并具有 25kW的片上特征电阻和分级电流源。其内部 100V 功率 MOSFET 可对来自长电缆的感应电压尖峰提供防护,同时低泄漏的特性可防止 25kW特征电阻出现故障。适用于数字VoIP电话、网络无线接入点、监控摄像机或要求功率低于 13W 的以太网小型设备。