Power Management System Supervisor, Monitor and Control Power Monitors

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LTC1966 - Precision Micropower, Delta Sigma RMS-to-DC Converter

LT2940 - Power and Current Monitor

Features

  • Four-Quadrant Power Measurement
  • ±5% Power Measurement Accuracy
  • 4V to 80V High Side Sense, 100V Max
  • Current Mode Power and Current Outputs
  • Output Bandwidth Exceeds 500kHz
  • ±3% Current Measurement Accuracy
  • 6V to 80V Supply Range, 100V Max
  • Inverting and Noninverting Open-Collector Comparator Outputs
  • Available in 12-Pin DFN (3mm × 3mm) and 12-Lead MSOP Packages

Typical Application

LT2940 Typical Application
LT2940 Typical Application

Description

The LT2940 measures a high side current and a differential voltage, multiplies them and outputs a current proportional to instantaneous power. Bidirectional high side currents and bipolar voltage differences are correctly handled by the four-quadrant multiplier and push-pull output stage, which allows the LT2940 to indicate forward and reverse power flow.

An integrated comparator with inverting and noninverting open-collector outputs makes the LT2940 a complete power level monitor. In addition, an output current proportional to the sensed high side current allows current monitoring. The current mode outputs make scaling, filtering and time integration as simple as selecting external resistors and/or capacitors.

Packaging

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

DFN-12, MS-12

LT2940 Package Drawing
LT2940 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT2940CDD#PBF DFN 12 C $2.93 $2.05 View
LT2940CDD#TRPBF DFN 12 C $2.11 View
LT2940CMS#PBF MSOP 12 C $2.93 $2.05 View
LT2940CMS#TRPBF MSOP 12 C $2.11 View
LT2940IDD#PBF DFN 12 I $3.51 $2.46 View
LT2940IDD#TRPBF DFN 12 I $2.52 View
LT2940IMS#PBF MSOP 12 I $3.51 $2.46 View
LT2940IMS#TRPBF MSOP 12 I $2.52 View
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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
DC1495A LT2940| Power & Current Monitor $25.00
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Click here to view our complete list of demo boards

Applications

  • Board Level Power and Current Monitoring
  • Line Card and Server Power Monitoring
  • Power Sense Circuit Breaker
  • Power Control Loops
  • Power/Energy Meters
  • Battery Charger Metering

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LT2940

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