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LT2940: Power and Current Monitor Data Sheet11/30/2009PDF342K
Overview
Features and Benefits
- 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
Product Details
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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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R553 Reliability Data3/23/2018PDF28 K
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DC1495A - Demo Manual2/22/2010PDF117K
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Precision High Side Current Sense Amplifiers7/13/2017PDF1M
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Power and Thermal Monitoring1/9/2017PDF1M
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LT2940 - True Analog Power and Current Monitoring6/29/2010PDF487K
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LT2940 Video Product Brief10/15/2018
Tools & Simulations
LTspice
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Models for the following parts are available in LTspice:
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
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LT2940CDD#PBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
LT2940CDD#TRPBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
LT2940CMS#PBF | Material Declaration | Reliability Data | 12-Lead MSOP | |
LT2940CMS#TRPBF | Material Declaration | Reliability Data | 12-Lead MSOP | |
LT2940IDD#PBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
LT2940IDD#TRPBF | Material Declaration | Reliability Data | 12-Lead DFN (3mm x 3mm w/ EP) | |
LT2940IMS#PBF | Material Declaration | Reliability Data | 12-Lead MSOP | |
LT2940IMS#TRPBF | Material Declaration | Reliability Data | 12-Lead MSOP | |
Wafer Fabrication Data | R553 Reliability Data |
PCN-PDN Information
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Support & Discussions
LT2940 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.