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  2. Power Management
  3. Battery Management
  4. Battery Fuel Gauge and Coulomb Counter
  5. MAX1924


Features and Benefits

  • Protect Against Cell Overvoltage Factory Programmable Limits from 4V to 4.4V Accurate to ±0.5%
  • Protect Against Cell Undervoltage Factory Programmable Limits from 2V to 3.2V Accurate to ±2.0%
  • Protect Against Charge, Discharge, and Pack- Short Current Faults
  • Automatically Trickle Charges Deeply Discharged Cells
  • Fully Integrated MOSFET Drivers Do Not Require Pullup Resistors
  • 0.8µA (typ) Shutdown Supply Current Prevents Deep Discharge of Cells
  • 30µA (typ) Operating Supply Current
  • 28V (max) Input Voltage
  • Available in Small 16-Pin QSOP Package
  • Product Details

    The MAX1894/MAX1924 are lithium-ion/lithium-polymer (Li+) battery-pack protector ICs for 3- or 4-series Li+ battery packs. The MAX1894/MAX1924 enhance the useful operating life of Li+ batteries by monitoring individual cell voltages and preventing over/undervoltage conditions. The MAX1894/MAX1924 also protect the battery pack against charge current, discharge current, and pack-short fault conditions.

    In case of a fault condition, on-board drivers control external P-channel MOSFETs, which disconnect the cells from the pack external terminals. The external protection MOSFETs are connected in a common-source configuration that does not require external pullup resistors. The MAX1894/MAX1924 use only one current-sense resistor to achieve the protection features. All protection thresholds and delays do not require any external components and are trimmed at the factory.

    If any cell voltage drops below the undervoltage threshold, the MAX1894/MAX1924 disconnect the pack from the load and power down to prevent deep discharge of the pack. The MAX1894/MAX1924 offer a trickle-charge feature, which provides a low-current path to safely charge a deeply discharged pack. The MAX1894/ MAX1924 also have two logic-level inputs, which can be used by a microcontroller to disable the protection MOSFETs and to put the device in shutdown. The MAX1894/MAX1924 have low quiescent current (30µA typ) and ultra-low shutdown current (0.8µA typ) to prevent deep-cell discharge.

    The MAX1894X is designed for 4-series battery packs, without hysteresis on the protection thresholds. The MAX1924V and MAX1924X include hysteresis for the 3- and 4-series packs, respectively.


    • 3- or 4-Series Li+ Battery Packs

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    MAX1924VEEE+ Material Declaration Reliability Data 16-QSOP-150_MIL
    MAX1924VEEE+T Material Declaration Reliability Data 16-QSOP-150_MIL
    MAX1924XEEE+ Material Declaration Reliability Data 16-QSOP-150_MIL
    MAX1924XEEE+T Material Declaration Reliability Data 16-QSOP-150_MIL
    Wafer Fabrication Data

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