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Power and current monitor copes with supply voltage uncertainty

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Linear Technology
: 15 December, 2009  (New Product)
The LT2940 power and current monitor from Linear Technology enables accurate measurement in difficult conditions with uncertain voltage and current levels
Power and current monitor copes with supply voltage uncertainty
Linear Technology Corporation introduces the LT2940, a power and current monitor for 4V to 80V systems. The LT2940 provides the necessary circuits to accurately measure, monitor and control power in situations where both the current and voltage may vary due to supply voltage uncertainty, component parametric changes, transient conditions or time-varying signals. Unlike traditional power monitors that rely on data converters and multiplying registers to calculate power, the LT2940 uses a true four-quadrant analogue multiplier that results in 5% power measurement accuracy and 3% current measurement accuracy, ensuring that boards and systems achieve optimum power efficiency and reliability. The LT2940 is suitable for use in line cards and servers, power-sense circuit breakers, power control loops and a wide variety of metering applications.

The LT2940 measures a high-side current and differential voltage, and calculates the instantaneous power at a bandwidth exceeding 500kHz. Bidirectional high-side currents and bipolar voltage differences are correctly handled by a four-quadrant multiplier and push-pull output stage, which allow the device to indicate forward and reverse power flow. After current and voltage measurements are taken, current and power levels can be scaled, filtered and monitored separately via their respective proportional-to-current and proportional-to-power current outputs. Meanwhile, an integrated comparator with complementary open-collector outputs can be used to create PWM control loops, or provide simple logic of, for example, an over-power pin, an LED indicator alarm, a MOSFET load cutoff switch, an external fan, or a binary counter for metering applications. Together, the wide supply range, wide bandwidth and uncompromised accuracy make the LT2940 a complete versatile power monitoring solution.

The LT2940 is offered in commercial and industrial versions, supporting operating temperature ranges from 0C to 70C and -40C to 85C, respectively. The LT2940 is available today in RoHS compliant, 12-pin 3mm x 3mm DFN and 12-lead MSOP packages. Pricing starts at $2.05 each in 1,000 piece quantities.
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