Battery gauges have lowest quiescent current for portable designs

Battery gauges have lowest quiescent current for portable designs

New Products |
By Christoph Hammerschmidt

The MAX17262 single-cell gauge with internal current sensing has a quiescent current of 5.2µA while the MAX17263 single-/multi-cell device with a quiescent current of 8.2µA handles 3-to-12 LEDs to indicate battery or system status in rugged applications that do not feature a display. The ICs provide accurate time-to-empty, time-to-full, state of charge (SOC) to one percent and mAhr data across a wide range of load conditions and temperatures.

The MAX17262 and MAX17263 combine traditional coulomb counting with Maxim’s ModelGauge m5 EZ algorithm for high-accuracy battery SOC that does not require battery characterisation, speeding up development time. The low quiescent current means both devices minimise current consumption during long periods of device standby time, extending battery life in the process. Both also have a dynamic power feature that enables the highest possible system performance without draining the battery.

In the MAX17262, an integrated RSENSE current resistor eliminates the need to use a larger discrete part, simplifying and reducing the board design. It measures up to 3.1A and is suitable for batteries of 100mAhr to 6Ah. In the MAX17263, the integrated, pushbutton LED controller further minimizes battery drain and alleviates the microcontroller from having to manage this function and can be used for applications using higher currents or battery capacity outside this range with an external current sense resistor of any size

At 1.5mm × 1.5mm IC size, the MAX17262 implementation is 30 percent smaller in size compared to using a discrete sense resistor with an alternate fuel gauge; at 3mm × 3mm, MAX17263 is the smallest in its class for lithium-ion-powered devices.

“In a push to make their products more user friendly, consumer IoT device manufacturers look for solutions that are highly integrated to reduce design size,” said Raghu Raj Singh, lead semiconductor equipment analyst for Technavio. “Anything that extends the operating time of the device by minimizing battery drain will be viewed as a boon for these developers. Maxim’s fuel-gauge ICs are ideally suited to address both needs.”

“With these industry-leading ICs, Maxim solves many of the conflicting and difficult battery-management challenges faced by designers of portable products,” said Bakul Damle, director of business management, Mobile Solutions at Maxim Integrated. “Maxim fuel-gauge ICs empower design innovation that leads to longer run-times for mobile and portable devices through industry-leading features and functionality.” 

The MAX17262 is available for $0.95 (1000 pieces, FOB USA); the MAX17263 is also on the site for $1.49 (1,000 pieces). The MAX17262XEVKIT evaluation kit is available for $60; the MAX17263GEVKIT is available for $60. Support includes the MAX1726x ModelGauge m5 EZ User Guide and Software Implementation Guide, as well as Linux drivers.

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