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Power monitor delivers accurate dynamic measurement

Posted: 27 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:IC power monitor? DC/DC converters? IR IR3721?

International Rectifier (IR) offers the IR3721 output power monitor IC for low-voltage DC/DC converters used in notebook computers, desktop computers, and energy-efficient server applications. The IR3721 uses the company's patent-pending TruePower technology to capture accurately highly dynamic power information with 2.5 percent accuracy at 65C.

The IR3721 measures dynamic power at the output/load side of voltage regulators to deliver a significant improvement in dynamic power measurement accuracy compared to competing power monitor ICs, said IR. TruePower technology addresses dynamic errors, which can account for more than a 30 percent error in competing solutions that monitor voltage and current separately in dynamic conditions with independent A/D conversion.

The IR3721 IC monitors the output filter inductor current in buck or multiphase converters from 0.5-1.8 V and provides the options of using resistive sensing or inductor DCR current sensing with an internal thermal compensation feature to achieve one percent higher efficiency compared to existing solutions while reducing bill of materials and board size requirements. The devices are RoHS compliant.

Price starts at $0.95 each in quantities of 10,000 for the IR3721MTRPBF (10-pin DFN lead-free package). Production orders are available immediately.

IR is one of the exhibitors in the upcoming IIC-China 2008.

- Gina Roos

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