LTC2945

RECOMMENDED FOR NEW DESIGNS

Wide Range I²C Power Monitor

Data Sheet (Rev. D) Product Selection Table

Part Models: 26
1ku List Price: Starting From $4.27

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Part Details

Rail-to-Rail Input Range: 0V to 80V
Wide Input Supply Range: 2.7V to 80V
Shunt Regulator for Supplies >80V
ΔΣ ADC with less than ±0.75% Total Unadjusted Error
12-Bit Resolution for Current and Voltages
Internal Multiplier Calculates 24-Bit Power Value
Stores Minimum and Maximum Values

Alerts When Limits Exceeded
Additional ADC Input Monitors an External Voltage
Continuous Scan and Snapshot Modes
Shutdown Mode with I_Q < 80μA
Split SDA for Opto-Isolation
Available in 12-Lead 3mm × 3mm QFN and MSOP Packages
AEC-Q100 Qualified for Automotive Applications

Part Models: 26
1ku List Price: Starting From $4.27

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
LTC2945CMS#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CMS#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CMS-1#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CMS-1#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CUD#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CUD#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CUD-1#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945CUD-1#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HMS#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HMS#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HMS-1#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HMS-1#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD#WPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD#WTRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD-1#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945HUD-1#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IMS#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IMS#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IMS-1#PBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IMS-1#TRPBF	12-Lead MSOP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IUD#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IUD#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IUD-1#PBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC2945IUD-1#TRPBF	12-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC2945CMS#PBF	PRODUCTION
LTC2945CMS#TRPBF	PRODUCTION
LTC2945CMS-1#PBF	PRODUCTION
LTC2945CMS-1#TRPBF	PRODUCTION
LTC2945CUD#PBF	PRODUCTION
LTC2945CUD#TRPBF	PRODUCTION
LTC2945CUD-1#PBF	PRODUCTION
LTC2945CUD-1#TRPBF	PRODUCTION
LTC2945HMS-1#PBF	PRODUCTION
LTC2945HMS-1#TRPBF	PRODUCTION
LTC2945HUD-1#PBF	PRODUCTION
LTC2945HUD-1#TRPBF	PRODUCTION
LTC2945IMS-1#PBF	PRODUCTION
LTC2945IMS-1#TRPBF	PRODUCTION
LTC2945IUD-1#PBF	PRODUCTION
LTC2945IUD-1#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
		PCN24_0004_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC2945CMS#PBF	PRODUCTION
LTC2945CMS#TRPBF	PRODUCTION
LTC2945CMS-1#PBF	PRODUCTION
LTC2945CMS-1#TRPBF	PRODUCTION
LTC2945HMS#PBF	PRODUCTION
LTC2945HMS#TRPBF	PRODUCTION
LTC2945IMS#PBF	PRODUCTION
LTC2945IMS#TRPBF	PRODUCTION
LTC2945IMS-1#PBF	PRODUCTION
LTC2945IMS-1#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
LTC2945CMS#PBF	PRODUCTION
LTC2945CMS#TRPBF	PRODUCTION
LTC2945CMS-1#PBF	PRODUCTION
LTC2945CMS-1#TRPBF	PRODUCTION
LTC2945HMS#PBF	PRODUCTION
LTC2945HMS#TRPBF	PRODUCTION
LTC2945HMS-1#PBF	PRODUCTION
LTC2945HMS-1#TRPBF	PRODUCTION
LTC2945IMS#PBF	PRODUCTION
LTC2945IMS#TRPBF	PRODUCTION
LTC2945IMS-1#PBF	PRODUCTION
LTC2945IMS-1#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC2945HMS#PBF	PRODUCTION
LTC2945HMS#TRPBF	PRODUCTION
LTC2945HUD#WPBF	PRODUCTION
LTC2945HUD#WTRPBF	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
LTC2945HMS-1#PBF	PRODUCTION
LTC2945HMS-1#TRPBF	PRODUCTION
Apr 17, 2025 - 25_0043 Change of Gold to Copper Wire and BOM (Automotive)
		PCN25_0043_Form Material_Report Delta Qualification Matrix Qualification Results Summary
LTC2945HUD#WPBF	PRODUCTION
LTC2945HUD#WTRPBF	PRODUCTION

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

Software Resources

Device Drivers 1

LTC2945 GitHub Linux Driver Source Code

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Current Sense Amplifiers 1
LTC2946	RECOMMENDED FOR NEW DESIGNS	Wide Range I²C Power, Charge and Energy Monitor
High Voltage Hot Swap Controllers 1
LTC4260	RECOMMENDED FOR NEW DESIGNS	Positive High Voltage Hot Swap Controller with I²C Compatible Monitoring
I²C Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
Serial Bus Buffers, Extenders, and Accelerators 1
LTC4317	PRODUCTION	Dual I²C/SMBus Address Translator

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC2945

Linduino 3

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.

Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.

Linduino code repository on GitHub and instructions on how to use the code.

Purchase Linduino

Evaluation Kits

LTC2945 Demo Board | Wide Range I2C Power Monitor (requires DC2026)

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Product Details

Demonstration circuit 1697A features the LTC2945. The LTC2945 is a rail-to-rail system monitor that measures current, voltage, and power. It features an operating range of 2.7V to 80V and includes a shunt regulator for supplies above 80V to allow flexibility in the selection of input supply. The current common mode measurement range of 0V to 80V is independent of the input supply. An onboard 0.75% accurate 12-bit ADC measures load current, input voltage and an auxiliary external voltage. A 24-bit power value is generated by digitally multiplying the measured 12-bit load current and input voltage data. Minimum and maximum values are stored and an overrange alert with programmable thresholds minimizes the need for software polling. Data is reported via a standard I²C interface. The demo board is populated for a 5A application. This can be changed by populating R1 accordingly.

Resources

DC1697A - Schematic
2/14/2013

DC1697A - Design Files
6/16/2016

DC1697A - Demo Manual
6/13/2016

Reference Designs

View Detailed Reference Design

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications