Fuel-gauge ICs set new standard for Li-ion battery charge accuracy - Embedded.com

Fuel-gauge ICs set new standard for Li-ion battery charge accuracy


The challenge of measuring the state of charge (SOC) of lithium-ion batteries is an issue for manufacturers of everything from smartphones and wearables to power tools and electric bikes. Accurately determining the amount of battery charge left in lithium-ion (Li-ion) batteries can go a long way toward improving their overall lifespan, reliability, and runtime. Maxim Integrated Products, Inc. recently announced a pair of new fuel-gauge ICs designed to provide market-leading accuracy of SOC measurements while decreasing time-to-market issues for manufacturers.

The MAX17262 single-cell and MAX17263 multi-cell fuel-gauge ICs both use the ModelGauge m5 EZ algorithm and standard coulomb counting to produce high-accuracy SOC measurements without the need for battery characterization, a costly and time-consuming process.

Key features:

  • Provide accurate time-to-empty (1%) and time-to-full state-of-charge data across a wide range of load conditions and temperatures
  • The ModelGauge m5 EZ algorithm eliminates the battery-characterization and calibration process
  • Quiescent current of 5.2 µA for the MAX17262 and 8.2 µA for MAX17263 extends runtime
  • Integrated Rsense current resistor (voltage and coulomb counting hybrid) reduces overall footprint and BOM cost and simplifies board layout
  • At 1.5 × 1.5 mm, the MAX17262 is 30% smaller compared to using a discrete sense resistor with an alternate fuel gauge, and at 3 × 3 mm, the MAX17263 is the smallest in its class for lithium-ion-powered devices
  • The single-/multi-cell MAX17263 also drives LEDs to indicate battery status on a pushbutton press or system status on system microcontroller commands