Maxim’s MAX17261METD+ is an ultra-low power fuel gauge IC which implements the Maxim ModelGauge™ m5 algorithm. The IC monitors multiple-series cell battery packs with an external resistor divider. The fuel gauge 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 two-wire I2C interface provides access to data and to control registers.The ModelGauge m5 EZ algorithm makes fuel gauge implementation easy by eliminating battery characterization requirements and simplifying host software interaction. The 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 MAX17261METD+ automatically compensates for cell-aging, temperature, 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.This is also available in a one-cell fuel gauge option, the MAX17260.
Feature
- ModelGauge m5 EZ
- No Characterization Required for EZ Performance
- Robust Against Battery Variation
- Eliminates Error Near Empty Voltage
- Eliminates Coulomb-Counter Drift
- Compensates for Age, Current, and Temperature
- Does Not Require Empty, Full, or Idle States
- Low 5.1μA Operating Current
- Monitors Multiple-Cell Battery Pack
- 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
Applications
- Tablets, 2-in-1 Laptops
- Digital Still, Video, and Action Cameras
- Medical Devices
- Handheld Computers and Terminals
- Financial Terminals
- Mobile Printers
- Augmented/Virtual Reality Devices
- Robots
- E-Bikes
- Battery Backups
- Wireless Speakers
