LINEAR 2PB_2940a True Analog Power and Current Monitoring User's Manual
Summary
A high-precision power and current monitor engineered for complex electronics in 4V to 80V systems. This module utilizes a true 4-quadrant analog multiplier to accurately measure bidirectional voltages and currents up to 500kHz bandwidth, excelling where traditional digital conditioners fail. The documentation details its use in board-level monitoring, server power supplies, battery charging circuits, circuit breaking, and sophisticated motor control loops demanding high accuracy (±3% to ±5%). It is essential for designers building robust, energy-conscious power systems.
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True Analog Power and Current Monitoring
ON (µ A)
4-Quadrant Multiplication Handles Bidirectional Currents and Bipolar Voltages The LT®2940 is a power and current monitor for 4V to 80V systems that brings together the necessary circuits to accurately measure, monitor and control power. Unlike traditional power monitors that rely on data converters and multiplying registers to calculate power, the LT2940 uses a true 4-quadrant analog multiplier for continuous results with 500k Hz bandwidth, ideal for use in many pulsed, chopped AC and control applications.
Features PMON Output Current
n 4-Quadrant Power Measurement vs Sense Input Voltages
n ±5% Power Measurement Accuracy
n 4V to 80V High-Side Sense, 100V Max VV = VV+ – VV– VCC ≥ 11V VI = VI+ – VI– VPMON = 0.5V
n Current Mode Power and Current Outputs
n 500k Hz Bandwidth
n ±3% Current Measurement Accuracy VV = –8V
n 6V to 80V Supply Range, 100V Max
n Inverting and Noninverting Open-Collector
Comparator Outputs n Available in 12-Pin 3mm × 3mm DFN and
12-Lead MSOP Packages
Applications
n Board Level Power and Current Monitoring 8V4V
n Line Card and Server Power Monitoring
n Power Sense Circuit Breaker –200
n MOSFET Power Monitoring VI (m V)
n Power/Energy Meters
n Battery Charger Metering
n Power Control Loops
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Page Summary Contents For LINEAR 2PB_2940a True Analog Power and Current Monitoring User's Manual
Manual Details
| Brand | Current |
|---|---|
| Pages | 2 |
| File Size | 487.09 KB |
| Published | May 18, 2026 |
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Frequently Asked Questions
What types of power and current monitoring can the LT2940 perform?
It monitors a wide range, from 4V to 80V systems, handling both single point (CC) and full board-level power/current tasks.
Does the LT2940 support pulsed or chopped AC applications?
Yes, it uses a true 4-quadrant analog multiplier with a 500kHz bandwidth, making it ideal for many pulsed, chopped AC, and control applications.
What are the accuracy specifications for power measurements?
The device provides ±5% overall Power Measurement Accuracy and ±3% Current Measurement Accuracy at 500kHz bandwidth.
In what packages is the LT2940 available?
It is available in 12-Pin 3mm × 3mm DFN, 0V space, or 12-Lead MSOP packages.