Stand-Alone ModelGauge m5 Fuel Gauge with SHA-256 Authentication

Industry's First Stand-Alone ModelGauge m5 Fuel Gauge with SHA-256 Authentication

Please check latest availability status for a specific part variant.


The MAX1720x/MAX1721x are ultra-low power stand-alone fuel gauge ICs that implement the Maxim ModelGauge m5 algorithm without requiring host interaction for configuration. This feature makes the MAX1720x/MAX1721x excellent pack-side fuel gauges. The MAX17201/MAX17211 monitor a single cell pack. The MAX17205/MAX17215 monitor and balance a 2S or 3S pack or monitor a multiple-series cell pack.

To prevent battery pack cloning, the ICs integrate SHA-256 authentication with a 160-bit secret key. Each IC incorporates a unique 64-bit ID.

The ModelGauge™ m5 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 milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions. As the battery approaches the critical region near empty, the ModelGauge m5 algorithm invokes a special error correction mechanism that eliminates any error. The ICs provide accurate estimation of time-to-empty and time-to-full, Cycle+ age forecast, and three methods for reporting the age of the battery: reduction in capacity, increase in battery resistance, and cycle odometer.

The ICs provide precision measurements of current, voltage, and temperature. Temperature of the battery pack is measured using an internal temperature measurement and up to two external thermistors supported by ratiometric measurements on auxiliary inputs. A Maxim 1-Wire® (MAX17211/MAX17215) or 2-wire I2C (MAX17201/MAX17205) interface provides access to data and control registers. The ICs are available in lead-free, 3mm × 3mm, 14-pin TDFN and 1.6mm × 2.4mm 15-bump WLP packages.

Design Solution: Advanced Battery Management for the Rest of Us ›

How to Prevent Battery Cloning Using the MAX17211EVKIT

MAX17201, MAX17205, MAX17211, MAX17215: Functional Diagram Ultra-low power stand-alone fuel gauge ICs that implement the Maxim ModelGauge™ m5 algorithm | Functional Diagram Enlarge+

Key Features

  • ModelGauge m5 Algorithm
    • Eliminates Error when Approaching Empty Voltage
    • Eliminates Coulomb-Counter Drift
    • Current, Temperature, and Age Compensated
    • Does Not Require Empty, Full, or Idle States
    • No Characterization Required for EZ Performance (See the ModelGauge m5 EZ Performance Section)
    • Cycle+ Age Forecasting Observes Lifespan
  • Nonvolatile Memory for Stand-Alone Operation
    • Learned Parameters and History Logging
    • Up to 75 Words Available for User Data
  • Precision Measurement System
    • No Calibration Required
  • Time-to-Empty and Time-to-Full Estimation
  • Temperature Measurement
    • Die Temperature
    • Up to Two External Thermistors
  • Multiple Series Cell Pack Operation
  • Low Quiescent Current
    • MAX172x1: 18µA Active, 9µA Hibernate
    • MAX172x5: 25µA Active, 12µA Hibernate
  • Alert Indicator for Voltage, SOC, Temperature, Current, and 1% SOC Change
  • High-Speed Overcurrent Comparators
  • Predicts Remaining Capacity Under Theoretical Load
  • SHA-256 Authentication
  • Maxim 1-Wire or 2-Wire (I2C) Interface
  • SBS 1.1 Compatible Register Set


  • Digital Still and Video Cameras
  • e-Readers
  • Handheld Computers and Terminals
  • Handheld Radios
  • Portable Game Players
  • Portable Medical Equipment
  • Smartphones and Tablets
Part NumberFunctionsBattery TypeInterfaceUser Data Storage
Parameters MeasuredFuel Gauge AlgorithmApplicationsVSUPPLY
Package/PinsOper. Temp.
minmaxSee Notes
Fuel Gauge
SHA-256 Authentication
Status Monitor
1 Cell Li-Ion2-Wire156 NVM
State of Charge
ModelGauge m5
-40 to +85$1.38 @1k
MAX17205 Multi-Cell Li-Ion2-Wire4.220
$1.68 @1k
MAX17211 1 Cell Li-Ion1-Wire2.34.9
$1.38 @1k
MAX17215 Multi-Cell Li-Ion1-Wire420
$1.68 @1k
See All Battery Monitors, Protectors, and Selectors (45)
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.

Part NumberFunctionsInterfaceUser Data Storage
Package/PinsOper. Temp.
See Notes
Fuel Gauge
SHA-256 Authentication
Status Monitor
2-Wire1248 NVM2.3 to 4.9
-40 to +85$1.38 @1k
MAX17205 2-Wire4.2 to 20
$1.68 @1k
MAX17211 1-Wire2.3 to 4.9
$1.38 @1k
MAX17215 1-Wire4.2 to 20
$1.68 @1k
See All Battery ID and Authentication (6)

MAX17201GEVKIT: Evaluation Kit for the MAX17201/MAX17211
MAX17201XEVKIT: Evaluation Kit for the MAX17201/MAX17211
MAX17211GEVKIT: Evaluation Kit for the MAX17201/MAX17211
MAX17211XEVKIT: Evaluation Kit for the MAX17201/MAX17211
MAX17205GEVKIT: Evaluation Kit for the MAX17205/MAX17215
MAX17205XEVKIT: Evaluation Kit for the MAX17205/MAX17215
MAX17215GEVKIT: Evaluation Kit for the MAX17205/MAX17215
MAX17215XEVKIT: Evaluation Kit for the MAX17205/MAX17215
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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.

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