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Analog Devices / Maxim Integrated MAX1720x & MAX1721x ModelGauge m5 Fuel Gauges

Analog Devices MAX1720x and MAX1721x ModelGauge™ m5 Fuel Gauges are stand-alone ICs that are excellent pack-side fuel gauges. The Analog Devices MAX1720x and MAX1721x implement the Maxim ModelGauge m5 algorithm without requiring host interaction for configuration. The MAX17201 and MAX17211 monitor a single-cell packs. The MAX17205 and MAX17215 monitor and balance a 2S or 3S pack or monitor a multiple-series cell pack. The ICs integrate SHA-256 authentication with a 160-bit secret key to prevent battery pack cloning. Each IC incorporates a unique 64-bit ID.

The Analog Devices MAX1720x and MAX1721x ModelGauge m5 Fuel Gauge ICs are available in lead-free, 3.0mm x 3.0mm TDFN-14 and
1.6mm x 2.4mm WLP-15 packages

Features

  • ModelGauge m5 algorithm
    • Eliminates error when approaching empty voltage
    • Eliminates coulomb-counter drift
    • Current, temperature and age compensated
    • It does not require empty, full, or idle states
    • No characterization is required for EZ performance
    • 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

Applications

  • Smartphones and tablets
  • Portable game players
  • E-readers
  • Digital still and video cameras
  • Handheld computers and terminals
  • Portable medical equipment
  • Handheld radios

Videos

Functional Block Diagram

Block Diagram - Analog Devices / Maxim Integrated MAX1720x & MAX1721x ModelGauge m5 Fuel Gauges
Published: 2016-04-04 | Updated: 2023-04-12