EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX17262 5.2A 1-Cell Fuel Gauge with ModelGauge m5 EZ and Internal Current Sensing General Description Benefits and Features The MAX17262 is an ultra-low power fuel-gauge IC which ModelGauge m5 EZ implements the Maxim ModelGauge m5 algorithm. The No Characterization Required for EZ IC monitors a single-cell battery pack and supports inter- Performance nal current sensing for up to 3.1A pulse current. The IC Robust Against Battery Variation provides best performance for batteries with 100mAhr to Eliminates Error Near Empty Voltage 6Ahr capacity. Eliminates Coulomb-Counter Drift The ModelGauge m5 EZ makes fuel-gauge implementa- Compensates for Age, Current, Temperature tion easy by eliminating battery characterization require- Does Not Require Empty, Full, or Idle States ments and simplifying host software interaction. The Low 5.2A Operating Current ModelGauge m5 EZ robust algorithm provides tolerance Integrated Internal Current Sensing against battery diversity for most lithium batteries and 7m Typical, up to 3.1A Pulse Currents applications. Supports Li+ and Variants Including LiFePO 4 The ModelGauge m5 EZ algorithm combines the short- Thermistor or 1C Internal Temperature term accuracy and linearity of a coulomb counter with the Dynamic Power Estimates Power Capability During long-term stability of a voltage-based fuel gauge, along Discharge with temperature compensation to provide industry-lead- Time-to-Empty and Time-to-Full Estimation ing fuel-gauge accuracy. The IC automatically compen- Constant Power or Constant Current sates for cell-aging, temperature, and discharge rate, Predicts Remaining Capacity Under Theoretical and provides accurate state-of-charge (SOC) in percent- age (%) and remaining capacity in milliampere-hours Load (mAh) over a wide range of operating conditions. As No Calibration Required the battery approaches the critical region near emp- Alert Indicator for Voltage, SOC, Temperature, ty, the ModelGauge m5 algorithm invokes a special cor- Current, and 1% SOC Change rection mechanism that eliminates any error. The IC pro- Ordering Information appears at end of data sheet. vides accurate estimation of time-to-empty and time-to- full and provides three methods for reporting the age of the battery: reduction in capacity, increase in battery re- Simple Fuel-Gauge Circuit Diagram sistance, and cycle odometer. The IC provides precision measurements of current, volt- BATT SYS SYSPWR age, and temperature. The temperature of the battery 0.1F pack is measured using an internal temperature sensor or 2 ALRT external thermistor. A 2-wire I C interface provides access to data and control registers. The IC is available in a tiny SDA lead-free 0.4mm pitch, 1.5mm x 1.5mm, 9-pin wafer-level SCL PROTECTION package (WLP). CIRCUIT REG TH MAX17262 0.47F Applications 10k Wearables and Smartwatches NTC GND Bluetooth Headset Cases SYSGND Health and Fitness Monitors Medical Devices Handheld Computers and Terminals Home and Building Automation, Sensors Toys ModelGauge is a trademark of Maxim Integrated Products, Inc. 19-100308 Rev 0 7/18MAX17262 5.2A 1-Cell Fuel Gauge with ModelGauge m5 EZ and Internal Current Sensing TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simple Fuel-Gauge Circuit Diagram . 1 Absolute Maximum Ratings 6 Package Information . 6 WLP . 6 Electrical Characteristics . 7 Typical Operating Characteristics 10 Pin Configuration(s) . 12 Pin Descriptions . 12 Functional Diagram . 13 Detailed Description 14 ModelGauge m5 EZ Performance . 14 Application Notes 15 Standard Register Formats . 15 ModelGauge m5 EZ Configuration Registers . 16 DesignCap Register (18h) . 16 VEmpty Register (3Ah) 16 ModelCfg Register (DBh) 17 IChgTerm Register (1Eh) 17 Config Register (1Dh) and Config2 Register (BBh) 17 ModelGauge m5 Algorithm . 19 ModelGauge m5 Algorithm Output Registers . 20 RepCap Register (05h) . 20 RepSOC Register (06h) . 21 FullCapRep Register (10h) . 21 TTE Register (11h) . 21 TTF Register (20h) . 21 Cycles Register (17h) . 21 Status Register (00h) . 21 Analog Measurements 22 Voltage Measurement 22 VCell Register (09h) 22 AvgVCell Register (19h) 22 MaxMinVolt Register (1Bh) 22 Current Measurement 23 www.maximintegrated.com Maxim Integrated 2