LT2940

PRODUCTION

Power and Current Monitor

Part Models: 8
1ku List Price: Starting From $2.48

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Overview

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

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.

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

Part Models: 8
1ku List Price: Starting From $2.48

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT2940CDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940CDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940CMS#PBF	12-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940CMS#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940IDD#PBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940IDD#TRPBF	12-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940IMS#PBF	12-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT2940IMS#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT2940CMS#PBF	PRODUCTION
LT2940CMS#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0129_Form Material_Report
LT2940CMS#PBF	PRODUCTION
LT2940CMS#TRPBF	PRODUCTION
LT2940IMS#PBF	PRODUCTION
LT2940IMS#TRPBF	PRODUCTION
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package
		PCN22_0244_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT2940IMS#PBF	PRODUCTION
LT2940IMS#TRPBF	PRODUCTION
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT2940IMS#PBF	PRODUCTION
LT2940IMS#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2945	RECOMMENDED FOR NEW DESIGNS	Wide Range I²C Power Monitor
Matched Resistors & Transistors 1
LT5400	RECOMMENDED FOR NEW DESIGNS	Quad Matched Resistor Network
Protection Switches & Controllers 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
RMS to DC Converters 1
LTC1966	PRODUCTION	Precision Micropower ΔΣ RMS-to-DC Converter

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT2940

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.