Linear launches current monitor for 4-80V systems
Linear Technology
LT2940 power/current monitor
Linear Technology has introduced the LT2940, a power and current monitor for 4 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.
It uses a true four-quadrant analogue multiplier that results in five per cent power-measurement accuracy and three per cent 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 variety of metering applications.
It 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.
The LT2940 is offered in commercial and industrial versions, supporting operating temperature ranges from 0 to 70C and -40 to 85C, respectively.
It is available in RoHS-compliant, 12-pin 3 x 3mm DFN and 12-lead MSOP packages.
Related images
Request more information
More stories
Data sheet: LTC3617 monolithic synchronous buck regulator from Linear Technologydownload
The LTC3617 from Linear Technology is a high-efficiency monolithic synchronous buck regulator that utilises a current-mode, constant-frequency architecture.
Linear Technology offers DC/DC controller suitable for sectors such as automotiveweblink
The LT3759 DC/DC controller from Linear Technology — which can generate negative or positive output voltages — is suitable for boost, SEPIC and inverting supply applications within sectors such as industrial, automotive, medical and telecom.
Data sheet: LT3759 current-mode DC/DC controller from Linear Technologydownload
The LT3759 from Linear Technology is a current-mode DC/DC controller that is capable of regulating either positive or negative output voltages from a single feedback pin. It can be configured as a boost, SEPIC or inverting converter.
Linear Technology offers frequency synthesiser for applications such as avionicsweblink
The LTC6946 frequency synthesiser from Linear Technology is suitable for improving the performance of multiband basestations that support LTE, W-CDMA, UMTS, CDMA, GSM and WiMAX standards — as well as point-to-point broadband wireless access, military, avionics, and high-performance test and measurement applications.
Data sheet: LTC6946 integer-N synthesiser with integrated VCO from Linear Technologydownload
The LTC6946 from Linear Technology is a low-noise 5.7GHz phase-locked loop (PLL) with a fully integrated VCO, including a reference divider, a phase-frequency detector with phase-lock indicator, an ultra-low-noise charge pump, an integer feedback divider and a VCO output divider. The charge pump contains selectable high- and low-voltage clamps that are useful for VCO monitoring.
