Data Sheet Rev. 3
CN Rev. 0

Overview

Features and Benefits

  • Switch-Mode Charger
    • High-Efficiency
    • Low Heat
    • Fast Charge Time
  • Small and Simple
  • Precise
    • Up to ±5% Current Regulation and 0.5% Voltage Regulation
  • Safe
    • JEITA Battery Temperature Monitor
    • Over/Undervoltage Protection, Safety Timers, Temperature Regulation
    • USB Friendly
  • Flexible
    • Programmable Voltage/Current
    • Status/Interrupts Through I2C
    • Automatic Input Current Limit
  • I2C Interface
    • Input Current Limit (100mA to 1500mA)
    • Fast-Charge/Termination Current (250mA to 1550mA)
    • Charge Voltage
      • 4.1V, 4.15V, 4.2V, 4.35V (MAX8971EWP+ and MAX8971GEWP+)
      • 4.35V, 4.40V, 4.45V, 4.50V (MAX8971BEWP+)
    • Termination Enable
  • +22V Absolute Maximum Input Voltage Rating
  • Up to 7.5V Maximum Operating Input Voltage
  • 5V USB/Safeout LDO for USB PHY
  • 2.3A GSM RF Test Mode (Factory Testing)
  • Charge Current to Voltage Conversion (VICHG) for Baseband ADC
  • Reverse Battery Leakage Protection
  • Input/Output Overvoltage Protection
  • Interrupt Status Output

Product Details

The MAX8971 is a compact, high-frequency, high-efficiency switch-mode charger for a one-cell lithium-ion (Li+) battery. It delivers up to 1.55A of current to the battery from inputs up to 7.5V and withstands transient inputs up to 22V. The 4MHz switch-mode charger is ideally suited for small portable devices, such as Bluetooth® headsets, AR/VR glasses, and other lithium-ion powered accessories. It minimizes component size and heat.

Battery-protection features include: low-voltage prequalification, charge fault timer, die temperature monitoring, and battery temperature monitoring. The battery temperature monitoring adjusts the charge current and termination voltage for safe use of secondary lithium-ion batteries.

The IC accepts either a general DC input or USB. It has programmable automatic input-current limiting to protect upstream charging sources such as USB.

Charge parameters are easily adjustable through an I²C interface. Charge is terminated based on user-selectable minimum current level. Charge status is provided to the application processor through an interrupt pin.

The IC is available in a space-saving, 20-bump, 2.18mm x 1.62mm WLP package.

Applications

  • AR/VR Glasses
  • Bluetooth Headsets
  • Hearables
  • Portable Devices
  • Smartphones
  • USB Charging
  • Wearables

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Evaluation Kits (2)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
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    Tools & Simulations

    Software Development

    MAX8971 Evaluation Kit Software, 3.0.2
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    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.

    MAX8971 Material Declaration
    Quality And Reliability
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