LT1787 - Precision, High Side Current Sense Amplifiers

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.

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
Applications
  • Battery Monitoring
  • Power Monitoring
  • Portable Phones
  • Cellular Phones
  • Portable Test/Measurement Systems
  • Battery-Operated Systems
Packaging
LT1787 Package Drawing
LT1787 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT1787CMS8#PBFMS-8C$2.60$2.25
LT1787CMS8#TRPBFMS-8C$2.31
LT1787CS8#PBFSO-8C$2.40$2.05
LT1787CS8#TRPBFSO-8C$2.11
LT1787HS8#PBFSO-8H$3.20$2.70
LT1787HS8#TRPBFSO-8H$2.75
LT1787HVCMS8#PBFMS-8C$3.55$3.05
LT1787HVCMS8#TRPBFMS-8C$3.11
LT1787HVCS8#PBFSO-8C$3.35$2.90
LT1787HVCS8#TRPBFSO-8C$2.96
LT1787HVHS8#PBFSO-8H$4.10$3.60
LT1787HVHS8#TRPBFSO-8H$3.65
LT1787HVIMS8#PBFMS-8I$4.45$3.85
LT1787HVIMS8#TRPBFMS-8I$3.91
LT1787HVIS8#PBFSO-8I$3.95$3.45
LT1787HVIS8#TRPBFSO-8I$3.51
LT1787IMS8#PBFMS-8I$3.15$2.75
LT1787IMS8#TRPBFMS-8I$2.81
LT1787IS8#PBFSO-8I$2.95$2.55
LT1787IS8#TRPBFSO-8I$2.61
Demo Boards
Part NumberDescriptionPrice
DC907A-BLTC6102, LT6100, LT1787, LTC2054, and LTC2439-1 (Requires DC590B) | Demo Board$150.00
Companion Boards
Part NumberDescriptionPrice
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Datasheet
Application Note
Design Note
Reliability Data
Product Selector Card
LT Journal
CAD Symbol
LTspice
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R334 Reliability Data
Precision High Side Current Sense Amplifiers
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LT1787 Footprints and Symbols
LT1787 Demo Circuit - Bidirectional Current Sense Amplifier with Offset Bipolar Output