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Maxim Integrated MAX1720x/MAX1721x stand-alone ModelGauge m5

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

Maxim MAX1720x- MAX1721x diagram

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.


Key features

  • Fuel Gauge IC
  • SHA-256 authentication
  • automatical compensation for cell aging
  • accurate estimation of time-to-empty and time-to-full


Additional 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


  • Handheld devices

Maxim Integrated MAX1720x/MAX1721x ModelGauge m5 | EBV Elektronik

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