MAX17055 7A 1-Cell Fuel Gauge with ModelGauge m5 EZ General Description Benefits and Features The MAX17055 is a low 7A operating current fuel gauge ModelGauge m5 EZ that implements Maxim ModelGauge m5 EZ algorithm. No Characterization Required for EZ Performance ModelGauge m5 EZ makes fuel gauge implementation Robust Against Battery Variation Eliminates Error Near Empty Voltage easy by eliminating battery characterization requirements and simplifying host software interaction. The ModelGauge Eliminates Coulomb Counter Drift Current, Temperature, and Age Compensated m5 EZ robust algorithm provides tolerance against battery diversity for most lithium batteries and applications. Does Not Require Empty, Full, or Idle States ModelGauge m5 EZ algorithm combines the short-term Low 7A Operating Current accuracy and linearity of a coulomb counter with the long- Wide Sense Resistor Range term stability of a voltage-based fuel gauge, along with 1m to 1000m temperature compensation to provide industry-leading PCB Metal Sensing + Temperature Compensation fuel gauge accuracy. The MAX17055 automatically com- Supports Li+ and Variants Including LiFePO 4 pensates for cell aging, temperature, and discharge rate, 1C Internal Temperature or Thermistor and provides accurate state of charge (SOC in %) and remaining capacity in milliampere-hours (mAh). As the Dynamic Power Estimates Power Capability During battery approaches the critical region near empty, the Discharge ModelGauge m5 algorithm invokes a special compensa- Time-to-Empty and Time-to-Full Estimation tion that eliminates any error. It also provides three meth- Constant Power or Constant Current ods for reporting the age of the battery: reduction in capac- Predicts Remaining Capacity Under Theoretical Load ity, increase in battery resistance, and cycle odometer. Precision Measurement System The MAX17055 provides precision measurements of cur- No Calibration Required rent, voltage, and temperature. Temperature of the battery pack is measured using an internal temperature mea- Alert Indicator for Voltage, SOC, Temperature, 2 surement or external thermistor. A 2-wire I C interface Current and 1% SOC Change provides access to data and control registers. Applications The MAX17055 is available in a tiny, lead-free 0.4mm Wearables, Smartwatches pitch 1.4mm x 1.5mm, 9-pin WLP package, and a 2mm x Smartphones 2.5mm, 10-pin TDFN package. Tablets, 2-in-1 Laptops Bluetooth Headsets Health and Fitness Monitors Digital Still, Video, and Action Cameras Medical Devices Handheld Computers and Terminals Wireless Speakers Home and Building Automation, Sensors Portable Game Players Toys Ordering Information appears at end of data sheet. ModelGauge is a trademark of Maxim Integrated Products, Inc. 19-8726 Rev 0 1/17MAX17055 7A 1-Cell Fuel Gauge with ModelGauge m5 EZ Simple Fuel Gauge Circuit Diagram SYSTEM BATTERY PACK PK+ 0.1F BATT ALRT HOST SDA P SCL MAX17055 REG 0.47F CSP CSN 10m PK- Maxim Integrated 2 www.maximintegrated.com PROTECTION