3µA 1-Cell/2-Cell Fuel Gauge with ModelGauge

Maximize Battery Run Time with Industry's Smallest Size, Lowest Power Fuel Gauges that Eliminate a Current-Sense Resistor

Please check latest availability status for a specific part variant.


The MAX17048/MAX17049 ICs are tiny, micropower current fuel gauges for lithium-ion (Li+) batteries in handheld and portable equipment. The MAX17048 operates with a single lithium cell and the MAX17049 with two lithium cells in series.

The ICs use the sophisticated Li+ battery-modeling algorithm ModelGauge to track the battery relative state-of-charge (SOC) continuously over widely varying charge and discharge conditions. The ModelGauge algorithm eliminates current-sense resistor and battery-learn cycles required in traditional fuel gauges. Temperature compensation is implemented using the system microcontroller.

The ICs automatically detect when the battery enters a low-current state and switches into a low-power 3µA hibernate mode, while still providing accurate fuel gauging. The ICs automatically exit hibernate mode when the system returns to active state.

On battery insertion, the ICs debounce initial voltage measurements to improve the initial SOC estimate, thus allowing them to be located on system side. SOC, voltage, and rate information is accessed using the I2C interface. The ICs are available in a tiny 0.9mm × 1.7mm, 8-bump wafer-level package (WLP), or a 2mm × 2mm, 8-pin TDFN package.

Simple Fuel-Gauge Circuit Diagram Tiny, micropower current fuel gauges for lithium-ion (Li+) batteries in handheld and portable equipment | Simple Fuel-Gauge Circuit Diagram Enlarge+

Key Features

  • MAX17048: 1 Cell, MAX17049: 2 Cells
  • Precision ±7.5m­V/Cell Voltage Measurement
  • ModelGauge Algorithm
    • Provides Accurate State-of-Charge
    • Compensates for Temperature/Load Variation
    • Does Not Accumulate Errors, Unlike Coulomb Counters
    • Eliminates Learning
    • Eliminates Current-Sense Resistor
  • Ultra-Low Quiescent Current
    • 3µA Hibernate, 23µA Active
    • Fuel Gauges in Hibernate Mode
    • Automatically Enters and Exits Hibernate Mode
  • Reports Charge and Discharge Rate
  • Battery-Insertion Debounce
    • Best of 16 Samples to Estimate Initial SOC
  • Programmable Reset for Battery Swap
    • 2.28V to 3.48V Range
  • Configurable Alert Indicator
    • Low SOC
    • 1% Change in SOC
    • Battery Undervoltage/Overvoltage
    • VRESET Alert
  • I2C Interface
  • 8-Bit OTP ID Register (Contact Factory)


  • Bluetooth Headsets
  • Digital Still, Video, and Action Cameras
  • Handheld Computers and Terminals
  • Health and Fitness Monitors
  • Home and Building Automation, Sensors
  • Medical Devices
  • Smartphones, Tablets
  • Smartwatches, Wearables
  • Wireless Speakers

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX17048EVKIT: Evaluation Kits for the MAX17048 and MAX17049
MAX17049EVKIT: Evaluation Kits for the MAX17048 and MAX17049
MAX17048XEVKIT: Evaluation Kits for the MAX17048X and MAX17049X
MAX17049XEVKIT: Evaluation Kits for the MAX17048X and MAX17049X

Technical Documents

App Note 5037 Battery Fuel Gauge

Additional Resources

BlogsKeeping an Eye on Battery SOC in Wearables and Hearables

Product Reliability Reports: MAX17048.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


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Type ID Title
App Note 5037 Battery Fuel Gauge