28V Linear Li+ Battery Charger with Smart Autoboot Assistant

The Simplest, Safest, and Smallest Charging Solution for Handheld Equipment

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The MAX8814 intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear charger is designed for charging a single-cell lithium-ion (Li+) battery.

The MAX8814 controls the charging sequence from the prequalification state through constant-current fast-charge and the final constant voltage charge. The IC achieves high flexibility by providing an adjustable fast-charge current through an external resistor. It also features a booting assistant circuit that distinguishes input sources and battery connection, and provides an output signal (ABO) for system booting.

The device operates over the extended temperature range (-40°C to +85°C), and is available in an 8-pin thermally enhanced 2mm x 2mm TDFN package (0.8mm max height).

MAX8814: Typical Operating Circuit MAX8814, a stand-alone, CCCV, thermally regulated linear charger, is made to charge a single-cell lithium-ion (Li+) battery | Typical Operating Circuit Enlarge+

Key Features

  • Reduces External Components and Total Cost
    • Integrated Current-Sensing Circuit, MOSFET Pass Element, and Thermally Regulation Circuitry
    • No Reverse Blocking Diode Required
  • Guarantees Safe and Accurate Battery Charging
    • Proprietary Die Temperature Regulation Control (+115°C) Allows Maximum Charging Current Without Damaging the IC
    • 4.25V to 28V Input Voltage Range with Over-Voltage Protection Above +7V to Protect Against Unqualified or Faulty AC Adapters
    • Soft-Start Limits Inrush Current
  • Integrated System Features for Compact Designs
    • Programmable Fast-Charge Current: 1ARMS Max
    • Charge-Current Monitor for Fuel Gauging (ISET)
    • Input Power-Source Detection Output (Active-Low POK) and Charge-Enable Input (Active-Low EN)
    • Output for Autobooting (ABO)
  • Reduce Power Dissipation
    • Low Dropout Voltage (300mV at 500mA)


  • Bluetooth® Equipment
  • Cellular and Cordless Phones
  • Charging Cradles and Docks
  • Digital Still Cameras
  • MP3 Players
  • Smartphones and PDAs
  • USB Appliances
Part NumberLithium Ion CellsProtected VIN
Charging VIN
Charge Rate Set byMax. ICHG
Charge TerminationCharge RegulationOper. Temp.
maxmaxSee Notes
MAX8814 1286.5
Analog Input
0.6External ControlLinear-40 to +85
$1.52 @1k
See All Battery Chargers (80)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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