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Linear Charger for Single-Cell Li+ Battery

Product Details

Key Features

Parametric specs for Battery Chargers
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.52
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Package/Pins UMAX/10
Budgetary
Price (See Notes)
1.52

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

    Description

    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.

    Simplified Block Diagram

    MAX1898: Typical Operating Circuit MAX1898: Typical Operating Circuit Zoom icon

    Technical Docs

    Support & Training

    Search our knowledge base for answers to your technical questions.

    Filtered Search

    Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .