Fuel gauge needs no battery characterization

-April 16, 2017

The MAX17055 single-cell fuel gauge from Maxim not only eliminates battery characterization, but also keeps SOC (state-of-charge) error to within 1% in most scenarios. With its ModelGauge m5 EZ algorithm, the device provides tolerance against battery diversity for most lithium batteries and applications. It also allows system designer’s to decide when to shut down the device when the battery gets low, maximizing device runtime.

As the battery approaches the critical region near empty, the ModelGauge m5 algorithm invokes a special error correction mechanism that eliminates any error. In addition, it provides three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

The MAX17055 measures current, voltage, and temperature, while a two-wire I2C interface permits access to data and control registers. Quiescent current is just 7 µA, which prevents excessive energy loss.

Offered in 1.41×1.5 mm, 9-pin WLP and 2×2.5 mm, 10-pin TDFN packages, the MAX17055 fuel gauge can be used for wearable devices, smart watches, smart phones, health and fitness monitors, body cameras, portable medical devices, and USB Type C portable devices.

The MAX17055 costs $1.08 each in lots of 10,000 units. An evaluation kit is available for $66. Both are shipped from stock.

MAX17055 product page

Maxim Integrated Products, www.maximintegrated.com

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