LT6109 - High Side Current Sense Amplifier with Reference and Comparators

Features

  • Current Sense Amplifier
    – Fast Step Response: 500ns
    – Low Offset Voltage: 125μV Maximum
    – Low Gain Error: 0.2% Maximum
  • Internal 400mV Precision Reference
  • Internal Latching Comparators with Reset
    – Fast Response Time: 500ns
    – Total Threshold Error: ±1.25% Maximum
    – Two Comparator Polarity Options
  • Wide Supply Range: 2.7V to 60V
  • Supply Current: 550μA
  • Low Shutdown Current: 5μA Maximum
  • Specified for –40°C to 125°C Temperature Range
  • Available in 10-Lead MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT6109 Typical Application
LT6109 Typical Application

Description

The LT®6109 is a complete high side current sense device that incorporates a precision current sense amplifier, an integrated voltage reference and two comparators. Two versions of the LT6109 are available. The LT6109-1 has the comparators connected in opposing polarity and the LT6109-2 has the comparators connected in the same polarity. In addition, the current sense amplifier and comparator inputs and outputs are directly accessible. The amplifier gain and comparator trip points are configured by external resistors. The open-drain comparator outputs allows for easy interface to other system components.

The overall propagation delay of the LT6109 is typically only 1.4μs, allowing for quick reaction to overcurrent and undercurrent conditions. The 1MHz bandwidth allows the LT6109 to be used for error detection in critical applications such as motor control. The high threshold accuracy of the comparators, combined with the ability to latch both comparators, ensures the LT6109 can capture high speed events.

The LT6109 is fully specified for operation from –40°C to 125°C, making it suitable for industrial and automotive applications. The LT6109 is available in a small 10-lead MSOP.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LT6109AHMS-1#PBF MS-10 MS H 05-08-1661 Yes
LT6109AHMS-1#TRPBF MS-10 MS H 05-08-1661 Yes
LT6109AHMS-2#PBF MS-10 MS H 05-08-1661 Yes
LT6109AHMS-2#TRPBF MS-10 MS H 05-08-1661 Yes
LT6109AIMS-1#PBF MS-10 MS I 05-08-1661 Yes
LT6109AIMS-1#TRPBF MS-10 MS I 05-08-1661 Yes
LT6109AIMS-2#PBF MS-10 MS I 05-08-1661 Yes
LT6109AIMS-2#TRPBF MS-10 MS I 05-08-1661 Yes
LT6109HMS-1#PBF MS-10 MS H 05-08-1661 Yes
LT6109HMS-1#TRPBF MS-10 MS H 05-08-1661 Yes
LT6109HMS-2#PBF MS-10 MS H 05-08-1661 Yes
LT6109HMS-2#TRPBF MS-10 MS H 05-08-1661 Yes
LT6109IMS-1#PBF MS-10 MS I 05-08-1661 Yes
LT6109IMS-1#TRPBF MS-10 MS I 05-08-1661 Yes
LT6109IMS-2#PBF MS-10 MS I 05-08-1661 Yes
LT6109IMS-2#TRPBF MS-10 MS I 05-08-1661 Yes


LT6109 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
LT6109AHMS-1#PBF MS-10 H $3.25 $2.34 Yes
LT6109AHMS-1#TRPBF MS-10 H $2.40 Yes
LT6109AHMS-2#PBF MS-10 H $3.25 $2.34 Yes
LT6109AHMS-2#TRPBF MS-10 H $2.40 Yes
LT6109AIMS-1#PBF MS-10 I $2.91 $2.09 Yes
LT6109AIMS-1#TRPBF MS-10 I $2.15 Yes
LT6109AIMS-2#PBF MS-10 I $2.91 $2.09 Yes
LT6109AIMS-2#TRPBF MS-10 I $2.15 Yes
LT6109HMS-1#PBF MS-10 H $2.91 $2.07 Yes
LT6109HMS-1#TRPBF MS-10 H $2.13 Yes
LT6109HMS-2#PBF MS-10 H $2.91 $2.07 Yes
LT6109HMS-2#TRPBF MS-10 H $2.13 Yes
LT6109IMS-1#PBF MS-10 I $2.59 $1.84 Yes
LT6109IMS-1#TRPBF MS-10 I $1.90 Yes
LT6109IMS-2#PBF MS-10 I $2.59 $1.84 Yes
LT6109IMS-2#TRPBF MS-10 I $1.90 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
DC1659A-A LT6109-1 | High Side Current Sense with Reference and Comparators $50.00
DC1659A-B LT6109-2 | High Side Current Sense with Reference and Comparators $50.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports 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
LT6109AHMS-1#PBF MS-10 H $3.25 $2.34 Yes
LT6109AHMS-1#TRPBF MS-10 H $2.40 Yes
LT6109AHMS-2#PBF MS-10 H $3.25 $2.34 Yes
LT6109AHMS-2#TRPBF MS-10 H $2.40 Yes
LT6109AIMS-1#PBF MS-10 I $2.91 $2.09 Yes
LT6109AIMS-1#TRPBF MS-10 I $2.15 Yes
LT6109AIMS-2#PBF MS-10 I $2.91 $2.09 Yes
LT6109AIMS-2#TRPBF MS-10 I $2.15 Yes
LT6109HMS-1#PBF MS-10 H $2.91 $2.07 Yes
LT6109HMS-1#TRPBF MS-10 H $2.13 Yes
LT6109HMS-2#PBF MS-10 H $2.91 $2.07 Yes
LT6109HMS-2#TRPBF MS-10 H $2.13 Yes
LT6109IMS-1#PBF MS-10 I $2.59 $1.84 Yes
LT6109IMS-1#TRPBF MS-10 I $1.90 Yes
LT6109IMS-2#PBF MS-10 I $2.59 $1.84 Yes
LT6109IMS-2#TRPBF MS-10 I $1.90 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

  • Overcurrent, Undercurrent and Fault Detection
  • Current Shunt Measurement
  • Battery Monitoring
  • Motor Control
  • Automotive Monitoring and Control
  • Remote Sensing
  • Industrial Control

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Design Tools

LTspiceIV

LTspice® IV 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 IV

Models for the following parts are available in LTspice IV:
LT6109-1
LT6109-2

Technical Support