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Battery monitor packs current-sense resistor

Posted: 17 Apr 2009 ?? ?Print Version ?Bookmark and Share

Keywords:battery monitor? resistor current sense? Li-ion battery?

DS2741 battery monitor

Maxim Integrated Products has launched the DS2741 current monitor/accumulator for cost-sensitive, Li-ion applications.

Claimed to be the first battery-monitoring IC to incorporate a high-side, current-sense resistor, the 3mm x 3mm device saves valuable real estate in space-constrained applications. Its topology allows users to connect the DS2741 directly to the power source to detect downstream failures and trigger appropriate corrective action. Additionally, it avoids the ground disturbance associated with low-side, current-sense designs. The DS2741 provides a complete current-sensing, measuring, and accumulation solution tailored for battery-charge-control and remaining-capacity-estimation applications. The device is designed for handheld wireless products such as multimedia players, mobile phones, PDAs and digital cameras. It is also well suited for automotive/telematics applications.

In order to support adjustments to battery-capacity estimates based on temperature, the DS2741 integrates a temperature sensor that measures temperatures over the entire -20sC to +70C operating range with a resolution of 1C.

The device consumes 60?A (typ) during active operation and only 1?A (typ) in low-power sleep mode, which increases battery runtime by minimizing drain on the battery.

The DS2741 is offered in a space-saving, 3mm x 3mm, 14-pin TDFN package. Prices start at $1.45 (1,000-up, FOB USA).

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