LT1787 - Precision, High Side Current Sense Amplifiers

Features

  • Input Offset Voltage: 75µV (Max)
  • 60V Supply Operation (LT1787HV)
  • 12-Bit Dynamic Range
  • Operating Current: 60µA
  • User-Selectable External Sense Resistor
  • Bidirectional High Side Current Sensing
  • Unidirectional or Bidirectional Output
  • Input Noise Filtering
  • Available in 8-Lead SO and MSOP Packages
  • –40°C to 125°C Operating Temperature Range

Typical Application

LT1787 Typical Application
LT1787 Typical Application

Description

The LT1787 is a complete micropower precision high side current sense amplifier. The LT1787 monitors bidirectional currents via the voltage across an external sense resistor. A current or voltage output indicates the direction and magnitude of the sense current. The LT1787 delivers greater than a 12-bit dynamic range with ultralow 40µV input offset voltage compared to a typical 250mV full-scale input voltage. A fixed gain of 8 is set by onboard precision resistors. Input signal filtering is easily implemented with a capacitor between the FIL– and FIL+ pins. The LT1787HV operates from 2.5V to 60V total supply voltage and the LT1787 operates from 2.5V to 36V total supply voltage. Both versions have a PSRR in excess of 120dB. The LT1787/LT1787HV draw only 60µA and are available in 8-lead SO and MSOP packages.

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
LT1787CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1787CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1787CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1787CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1787HS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1787HS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1787HVCMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1787HVCMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1787HVCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1787HVCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1787HVHS8#PBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1787HVHS8#TRPBF SO-8 S8 H 05-08-1610 (S8) Yes
LT1787HVIMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LT1787HVIMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LT1787HVIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1787HVIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1787IMS8#PBF MS-8 MS8 I 05-08-1660 Yes
LT1787IMS8#TRPBF MS-8 MS8 I 05-08-1660 Yes
LT1787IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1787IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1787 Package Drawing
LT1787 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
LT1787CMS8#PBF MS-8 C $2.60 $2.25 Yes
LT1787CMS8#TRPBF MS-8 C $2.31 Yes
LT1787CS8#PBF SO-8 C $2.40 $2.05 Yes
LT1787CS8#TRPBF SO-8 C $2.11 Yes
LT1787HS8#PBF SO-8 H $3.20 $2.70 Yes
LT1787HS8#TRPBF SO-8 H $2.75 Yes
LT1787HVCMS8#PBF MS-8 C $3.55 $3.05 Yes
LT1787HVCMS8#TRPBF MS-8 C $3.11 Yes
LT1787HVCS8#PBF SO-8 C $3.35 $2.90 Yes
LT1787HVCS8#TRPBF SO-8 C $2.96 Yes
LT1787HVHS8#PBF SO-8 H $4.10 $3.60 Yes
LT1787HVHS8#TRPBF SO-8 H $3.65 Yes
LT1787HVIMS8#PBF MS-8 I $4.45 $3.85 Yes
LT1787HVIMS8#TRPBF MS-8 I $3.91 Yes
LT1787HVIS8#PBF SO-8 I $3.95 $3.45 Yes
LT1787HVIS8#TRPBF SO-8 I $3.51 Yes
LT1787IMS8#PBF MS-8 I $3.15 $2.75 Yes
LT1787IMS8#TRPBF MS-8 I $2.81 Yes
LT1787IS8#PBF SO-8 I $2.95 $2.55 Yes
LT1787IS8#TRPBF SO-8 I $2.61 Yes
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* 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
DC907A-B LTC6102, LT6100, LT1787, LTC2054, and LTC2439-1 (Requires DC590B) | Demo Board $150.00
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Companion Boards

Part Number Description Price Documentation
DC590B Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards $50.00
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Click here to view our complete list of demo boards

Applications

  • Battery Monitoring
  • Power Monitoring
  • Portable Phones
  • Cellular Phones
  • Portable Test/Measurement Systems
  • Battery-Operated Systems

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Design Tools

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LT1787

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