MAX8725

PRODUCTION

Multichemistry Battery Chargers with Automatic System Power Selector

0.5% Accurate Multichemistry Battery Chargers for Single- and Dual-Battery Systems

Data Sheet (Rev. 3) Product Selection Table
Part Models
2
1ku List Price
Starting From $3.96
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Part Details

  • Precise Measurement Improves Safety and Performance
    • ±0.5% Accurate Charge Voltage (0°C to +85°C)
    • ±3% Accurate Input Current Limiting
    • ±5% Accurate Charge Current
    • Analog Inputs Control Charge Current and Charge Voltage
  • Charge Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
    • Up to 17.65V (max) Battery Voltage
    • Maximum 28V Input Voltage
    • Programmable Charge Current > 4A
  • Intelligent AC Adapter Interface Makes Design Easier
    • Automatic System Power/Source Selection
    • Analog Monitoring of Current Drawn from AC Input Source
    • Digital Output Indicates AC Adapter Presence
  • Greater than 95% Efficiency Extends Battery Life
MAX8725
Multichemistry Battery Chargers with Automatic System Power Selector
MAX1909, MAX8725: Pin Configuration
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Documentation

Data Sheet 1

Reliability Data 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Product 1
MAX1535
Highly Integrated Level 2 SMBus Battery Chargers
Switching Battery Chargers 3
MAX1908
PRODUCTION Low-Cost Multichemistry Battery Chargers
MAX1772
PRODUCTION Low-Cost, Multichemistry Battery-Charger Building Block
MAX1645B
PRODUCTION Advanced Chemistry-Independent, Level 2 Battery Charger with Input Current Limiting
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Evaluation Kits

MAX8725EVKIT

Evaluation Kit for the MAX8725

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Features and Benefits

  • Input Current Limiting
  • ±0.5% Output Voltage Accuracy Using Internal Reference
  • Automatic Selection of System Power Source
  • Analog Inputs Control Charge Current and Charge Voltage
  • Monitor Outputs for
    AC Adapter Current
    AC Adapter Presence
  • Up to 17.6V Battery Voltage
  • +8V to +25V Input Voltage
  • Up to 3A Battery-Charge Current
  • Charges Li+, NiCd, and NiMH Battery Chemistries
  • Surface-Mount Construction
  • Fully Assembled and Tested

    • Product Details

    The MAX8725 evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. The EV kit can charge three or four series Li+ cells with a current up to 3A. Charge current and input-source current are adjustable using on-board potentiometers. The output voltage is set to 4.2V • the number of series cells in the battery pack. The number of series cells is jumper selectable. The output voltage is adjustable between 4V to 4.4V (x the number of series cells) by installing two resistors. The EV kit provides outputs to monitor the AC-adapter current and the presence of an AC adapter.

    The MAX8725 automatically selects the power path for supplying power to the system by controlling two external p-channel MOSFETs. This decision is made based on the presence of an AC adapter.

    Applications

    • Handheld Data Terminals
    • Notebook and Subnotebook Computers

    MAX1909EVKIT

    Evaluation Kit for the MAX1909

    Buy Now View Details

    Features and Benefits

    • Input Current Limiting
    • ±0.5% Output Voltage Accuracy Using Internal Reference
    • Automatic Selection of System Power Source
    • Analog Inputs Control Charge Current and Charge Voltage
    • Monitor Outputs for
      • AC Adapter Current
      • AC Adapter Presence
    • Up to 17.6V Battery Voltage
    • +8V to +25V Input Voltage
    • Up to 3A Battery Charge Current
    • Charges Li+, NiCd, and NiMH Battery Chemistries
    • Surface-Mount Construction
    • Fully Assembled and Tested

    Product Details

    The MAX1909 evaluation kit (EV kit) is an accurate and efficient multichemistry battery charger. The EV kit can charge three or four series Li+ cells with a current up to 3A. Charge current and input-source current are adjustable using on-board potentiometers. The output voltage is set to 4.2V x the number of series cells in the battery pack. The number of series cells is jumper-selectable. The output voltage is adjustable between 4V to 4.4V (x number of series cells) by installing two resistors. The EV kit provides outputs to monitor the AC adapter current and the presence of an AC adapter.

    The MAX1909 automatically selects the power path for supplying power to the system by controlling two external P-channel MOSFETs. This decision is made based on the presence of an AC adapter.

    Applications

    • Handheld Data Terminals
    • Notebook and Subnotebook Computers
    MAX8725EVKIT
    Evaluation Kit for the MAX8725
    MAX1909EVKIT
    Evaluation Kit for the MAX1909

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