MAX17055EWL+T

The MAX17055EWL+T is a low-power fuel gauge IC from Analog Devices, implementing the ModelGauge m5 EZ algorithm. This algorithm simplifies fuel gauge implementation by eliminating battery characterization requirements and reducing host software interaction. It provides robust performance against battery diversity for most lithium batteries.

The ModelGauge m5 EZ algorithm combines the accuracy of a coulomb counter with the long-term stability of a voltage-based fuel gauge, incorporating temperature compensation for industry-leading accuracy. The MAX17055 automatically compensates for cell aging, temperature, and discharge rate, delivering precise state of charge (SOC in %) and remaining capacity in milliampere-hours (mAh). It also offers three methods for reporting battery age: capacity reduction, increased battery resistance, and cycle odometer.

This IC provides precision measurements of current, voltage, and temperature, with temperature sensing via an internal sensor or an external thermistor. Communication is handled through a 2-wire I2C interface. The MAX17055 is available in a compact 9-pin WLP package (1.4mm x 1.5mm) and a 10-pin TDFN package (2mm x 2.5mm).

Key features include no characterization required for EZ performance, robustness against battery variation, and compensation for current, temperature, and age. It supports Li+ and variants including LiFePO4, and offers dynamic power estimates and time-to-empty/full estimations. The device operates at a low 7μA current and supports a wide sense resistor range from 1mΩ to 1000mΩ.