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A battery fuel gauge, also known as a battery gas gauge, determines battery state-of-charge (SOC) and state-of-health. A battery fuel gauge IC can predict how much longer, under specific operating conditions, the battery can continue to provide power. Inadequate battery life and unreliable battery SOC reporting are some of the most common complaints about any battery-powered device. Highly accurate battery fuel gauges are needed to avoid surprise shutdowns and are critical for a positive user experience.

Our battery fuel gauges have been successfully used in over one billion devices. Time-to-empty, time-to-full, battery age forecasting, and dynamic power features extend run-time of transient loads. Industry-leading features include:

Our patented ModelGauge algorithm provides the industry's best accuracy for reporting battery SOC. By eliminating the current-sense resistor and other external components, our ModelGauge battery fuel gauge ICs also save cost and space.

ModelGauge m5 Battery Fuel Gauges

Our patented ModelGauge m5 algorithm combines the excellent short-term accuracy and linearity of a coulomb counter, the long-term stability of a voltage-based ModelGauge battery fuel gauge, and temperature compensation to provide industry-leading fuel-gauge accuracy. In addition, as the battery approaches the critical region near empty, the ModelGauge m5 algorithm invokes a special error correction mechanism that eliminates any error. These battery gauge ICs provide accurate estimation of time-to-empty and time-to-full while charging, and three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

Dynamic battery power technology enables the system to operate at peak performance by providing real-time information on the maximum power that the battery can deliver without violating the minimum system voltage requirement. At the same time, the algorithm enables the battery gas gauge to operate at very low quiescent current, which extends the operating life for small battery applications. Some versions include Cycle+™ age forecast and SHA-256 authentication to prevent the use of counterfeit batteries.

ModelGauge m5 EZ Algorithm

The ModelGauge m5 EZ algorithm makes battery fuel gauge implementation easier by eliminating battery characterization requirements. The m5 EZ algorithm delivers highly accurate battery SOC, for most use cases, without requiring the usual lengthy battery characterization process, resulting in shorter design cycles. The robust algorithm also provides tolerance of battery diversity for most lithium batteries and applications.

Battery Fuel Gauges with Authentication and Protection

We also offer battery fuel gauge ICs with authentication and protection. Some devices integrate a battery gauge with a lithium-ion protector and a Secure Hash Algorithm-1 (SHA-1) or Secure Hash Algorithm-2 (SHA-2) based on the challenge-response authentication system.

Battery Gauge Analog Front-Ends (AFEs)

Our battery gauge AFEs are precision analog front-end ICs for measuring current, voltage, and temperature. On-chip temperature measurements eliminate the need for a thermistor in the battery pack. Our battery gauge AFEs can also use temperature data to enable gain and temperature-coefficient compensation in the current measurement, thereby allowing the use of a low-cost current-sense resistor.

  • Highest accuracy SOC reporting, even in difficult conditions like very low temperatures and very high loads
  • Low quiescent current for low-power applications such as wearables
  • Strong SHA-256 authentication to prevent counterfeit battery packs

Featured Videos


Better Battery Safety and User Experience with Accurate Fuel Gauges
32:15 April 02, 2021


Getting Started with the Basics of Maxim’s ModelGauge m5 Technology
11:05 November 30, 2020


Faster Battery Fuel Gauging Using the MAX17260 Fuel Gauge with ModelGauge M5 EZ
6:37 March 26, 2019

Application Notes

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Get Accurate Battery SOC and Long Runtime for Your Portable Designs

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Featured Blogs

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Videos


Better Battery Safety and User Experience with Accurate Fuel Gauges
32:15 April 02, 2021


Fundamentals of Battery Fuel Gauges
27:37 August 01, 2018


Getting Started Estimating the State-of-Charge for Li-Ion Batteries
4:34 May 12, 2020


EZ Setup of MAX17055 ModelGauge m5 Low IQ Stand-Alone Fuel Gauge
8:16 March 29, 2017


EZ Setup of MAX17201/MAX17211 ModelGauge m5 Stand-Alone Fuel Gauges
11:50 February 03, 2017


Introduction to the MAX17301 and MAX17311: 1-Cell ModelGauge m5 EZ Fuel Gauge with 2-Level Protector and SHA-256 Authentication
10:50 August 21, 2019


Faster Battery Fuel Gauging Using the MAX17260 Fuel Gauge with ModelGauge M5 EZ
6:37 March 26, 2019


Introduction to the MAX17301 and MAX17311: 1-Cell ModelGauge m5 EZ Fuel Gauge with 2-Level Protector and SHA-256 Authentication
10:50 August 21, 2019


How to Select and Configure a Battery Fuel Gauge for Your Portable System
5:21 March 14, 2019

Featured Products

Pack-Side Fuel Gauges

Product Number of Li-Ion Cells Special Features Quiescent Current Typical Applications Buy Sample EV Kit
MAX17301 Single-Cell (1S) Protector, SHA-256 authentication, life-logging 9µA Smartphones, Tablets, AR/VR Glasses, mPOS Buy Sample Buy
MAX17303 Single-Cell (1S) Protector, life-logging 9µA Smartphones, Tablets, AR/VR Glasses, mPOS Buy Sample Buy
MAX17201 Single-Cell (1S) SHA-256 authentication, life-logging 9µA Smartphones, Tablets, AR/VR Glasses, mPOS Buy Sample Buy
MAX17205 Multicell (2S+) SHA-256 authentication, life-logging 12µA Ultrabooks, 2-Way Radios, Robotics, Drones, Power Tools Buy Sample Buy

Host-Side Fuel Gauges

Product Number of Li-Ion Cells Special Features Quiescent Current Typical Applications Buy Sample EV Kit
MAX17260 Single-Cell (1S) High-side or low-side current sensing 5.1µA Smartwatch, True Wireless Stereo Headset, Smartphones, Tablets, AR/VR Glasses, mPOS, Health and Fitness Monitors, Portable Game Players Buy   Buy
MAX17261 Multi-Cell (2S and higher) Host-side 5.1µA Ultrabooks, Medical Devices, Mobile Printers, Drones, Wireless Speakers Buy   Buy
MAX17262 Single-Cell (1S) Integrated sense resistor 5.2µA Trackers, Medical Devices, Health and Fitness Monitors Buy   Buy
MAX17263 Single-Cell, (1S), Multi-Cell (2S+) LED drivers 5.1µA Battery Backup, Drones, E-Bikes, Headlamps and Torches, Power Tools, Wireless Speakers, Toys Buy   Buy

Featured Designs

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MAX17205XEVKIT

The MAX17205X evaluation kits (EV kits) are fully assembled and tested.
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MAX17320X2EVKIT

The MAX17320X/MAX17320G evaluation kits (EV kits) are fully assembled and tested.
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MAX17048EVKIT

Smallest, lowest power fuel gauge with proven, voltage-only ModelGauge algorithm.
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MAX17261XEVKIT

Monitors a multiple-series cell battery pack with an external resistor divider.
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MAX17260XEVKIT

Evaluates the stand-alone ModelGauge™ m5 host-side fuel-gauge ICs for lithium-ion (Li+) batterie...
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MAX17301XEVKIT

Evaluates 1-cell ModelGauge m5 EZ pack-side fuel gauges with protector and SHA-256 authenticatio...