Battery gauges have lowest quiescent current for portable designs

August 29, 2018 // By Nick Flaherty
Battery gauges have lowest quiescent current for portable designs
Maxim Integrated has launched two highly accurate battery gauges with low quiescent power for wearables, electric bicycles, power tools and internet of things (IoT) designs.

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

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