LT6105CDCB#TRPBF

The LT6105 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 monitoring a fuse or MOSFET switch. Gain is configured 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 typical 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.

Applications

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

Key features

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