Single/Multi-Cell Fuel Gauge with ModelGauge m5 EZ and Integrated LED Control

The MAX17263 is an ultra-low power fuel gauge which implements Maxim ModelGauge™ m5 EZ algorithm. The MAX17263 monitors either a single cell battery pack or multiple-series cell battery pack with an external resistor divider. The IC drives 3 to 12 automatically-counted LEDs to indicate battery state-of-charge on a push-button press, or any other system status using I2C commands.

ModelGauge m5 EZ makes fuel gauge implementation easy by eliminating battery characterization requirements and simplifying host software interaction. The ModelGauge m5 EZ robust algorithm provides tolerance against battery diversity for most lithium batteries and applications.

The algorithm combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge, along with temperature compensation to provide industry-leading fuel-gauge accuracy. The IC automatically compensates for cell-aging, temperature, and discharge rate, and provides accurate state-of-charge (SOC) in percentage (%) and remaining capacity in milliampere-hours (mAh) over a wide range of operating conditions. As the battery approaches the critical region near empty, the algorithm invokes a special correction mechanism that eliminates any error. The IC provides 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 resistance, and cycle odometer.

The IC provides precision measurements of current, voltage, and temperature. The temperature of the battery pack is measured using an internal temperature sensor or external thermistor. A 2-wire I2C interface provides access to data and control registers. The IC is available in a 3mm x 3mm 14-pin TDFN package.

Applications

* Battery Backup

* Drones

* E-Bikes

* Headlamps and Torches

* Home and Building Automation, Sensors

* Medical Devices

* Power Tools

* Toys

* Wireless Speakers

* ModelGauge m5 EZ

* No Characterization Required for EZ Performance

* Robust Against Battery Variation

* Eliminates Error Near Empty Voltage

* Eliminates Coulomb Counter Drift

* Current, Temperature, and Age Compensated

* Does Not Require Empty, Full, or Idle States

* Monitors Single Cell or Multiple-Series Cell Battery Pack

* Integrated LED Control with Push-Button Input

* Drives 3 to 12 LEDs, Automatically Counted

* Custom Pattern LED Control Using I2C Commands

* Accurate Current Sensing

* High-Side or Low-Side Sensing Options

* Wide Sense Resistor Range: 1mΩ to 1000mΩ

* PCB Metal Sensing + Temperature Compensation

* Supports Li+ and Variants Including LiFePO4

* Thermistor or ±1°C Internal Temperature

* Dynamic Power Estimates Power Capability During Discharge

* Time-to-Empty and Time-to-Full Estimation

* Predicts Remaining Capacity Under Theoretical Load

* No Calibration Required

* Alert Indicator for Voltage, SOC, Temperature, Current, and 1% SOC Change