LT6105 - Precision, Rail-to-Rail Input Current Sense Amplifier

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
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT6105 Typical Application
LT6105 Typical Application

Description

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 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT6105CDCB#PBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LT6105CDCB#TRMPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LT6105CDCB#TRPBF 2x3 DFN-6 DCB C 05-08-1715 Yes
LT6105CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT6105CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT6105HDCB#PBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT6105HDCB#TRMPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT6105HDCB#TRPBF 2x3 DFN-6 DCB H 05-08-1715 Yes
LT6105HMS8#PBF MS-8 MS8 H 05-08-1660 Yes
LT6105HMS8#TRPBF MS-8 MS8 H 05-08-1660 Yes
LT6105IDCB#PBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT6105IDCB#TRMPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT6105IDCB#TRPBF 2x3 DFN-6 DCB I 05-08-1715 Yes
LT6105IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LT6105IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes


LT6105 Package Drawing
LT6105 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT6105CDCB#PBF 2x3 DFN-6 C $1.38 Yes
LT6105CDCB#TRMPBF 2x3 DFN-6 C $1.38 $1.04 Yes
LT6105CDCB#TRPBF 2x3 DFN-6 C $1.38 $0.99 Yes
LT6105CMS8#PBF MS-8 C $1.38 $0.99 Yes
LT6105CMS8#TRPBF MS-8 C $1.44 $1.05 Yes
LT6105HDCB#PBF 2x3 DFN-6 H $1.86 Yes
LT6105HDCB#TRMPBF 2x3 DFN-6 H $1.86 $1.39 Yes
LT6105HDCB#TRPBF 2x3 DFN-6 H $1.86 $1.34 Yes
LT6105HMS8#PBF MS-8 H $1.86 $1.34 Yes
LT6105HMS8#TRPBF MS-8 H $1.92 $1.40 Yes
LT6105IDCB#PBF 2x3 DFN-6 I $1.59 Yes
LT6105IDCB#TRMPBF 2x3 DFN-6 I $1.59 $1.19 Yes
LT6105IDCB#TRPBF 2x3 DFN-6 I $1.59 $1.14 Yes
LT6105IMS8#PBF MS-8 I $1.59 $1.14 Yes
LT6105IMS8#TRPBF MS-8 I $1.65 $1.20 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1192A LT6105 Current Sense Demo Board $50.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT6105HDCB#PBF 2x3 DFN-6 H $1.86 Yes
LT6105HDCB#TRMPBF 2x3 DFN-6 H $1.86 $1.39 Yes
LT6105HDCB#TRPBF 2x3 DFN-6 H $1.86 $1.34 Yes
LT6105HMS8#PBF MS-8 H $1.86 $1.34 Yes
LT6105HMS8#TRPBF MS-8 H $1.92 $1.40 Yes
LT6105IDCB#PBF 2x3 DFN-6 I $1.59 Yes
LT6105IDCB#TRMPBF 2x3 DFN-6 I $1.59 $1.19 Yes
LT6105IDCB#TRPBF 2x3 DFN-6 I $1.59 $1.14 Yes
LT6105IMS8#PBF MS-8 I $1.59 $1.14 Yes
LT6105IMS8#TRPBF MS-8 I $1.65 $1.20 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT6105

Technical Support