Linear Charger for Single-Cell Li+ Battery

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The MAX1898, with an external PNP or PMOS transistor, forms a complete charger for 1-cell lithium-ion (Li+) batteries. The MAX1898 provides accurate constant-current/constant-voltage charging. Battery regulation voltage accuracy is ±0.75% for optimum battery performance and cycle life. Charging current is user set, but is sensed internally so no external current-sense resistor is needed. The MAX1898 also provides outputs to monitor charge status, presence-of-input power source, and charge current. Additional features include shutdown, optional charge-cycle restart without input-power cycling, selectable charge termination safety timer, and low-current preconditioning for deeply discharged cells.

The MAX1898 offers the maximum integration and functionality in the smallest, most basic application circuit possible. Very few external components are required.

The MAX1898 offers two versions to safely charge all Li+ battery chemistries. The battery regulation voltage is 4.2V for the MAX1898EUB42 and 4.1V for the MAX1898EUB41. Both are available in a 10-pin ultra-thin µMAX package.
MAX1898: Typical Operating Circuit MAX1898: Typical Operating Circuit Enlarge+

Key Features

  • Simple, Safe Linear Charger
  • Uses Low-Cost PNP or PMOS Pass Element
  • 4.5V to 12V Input Range
  • Internal Current-Sense Resistor
  • ±0.75% Voltage Accuracy
  • Programmable Charging Current
  • Automatic Input Power-Source Detection
  • LED Charge Status Indicator
  • Programmable Safety Timer
  • Current-Sense Monitor Output
  • Optional/Adjustable Auto-Restart
  • Small µMAX Package
  • Applications/Uses

    • Cell Phones
    • Cradle Chargers
    • PDAs
    • Self-Charging Battery Packs
    • Single-Cell Li+ Powered Portables

    See parametric specs for Battery Chargers (73)

    Part NumberLithium Ion CellsProtected VIN
    Charging VIN
    Charge Rate Set byMax. ICHG
    Charge TerminationCharge RegulationOper. Temp.
    maxmaxSee Notes
    MAX1898 11212Resistor1.4TimerLinear-40 to +85
    $1.52 @1k

    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.

    MAX1898EVKIT: Evaluation Kit for the MAX1898
    Request Reliability Report for: MAX1898 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    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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