MAX1925

Switch-Mode 1-Cell Li+ Chargers

Smallest, Simplest Switch-Mode Li+ Charger in 4mm x 4mm QFN Package


Please check latest availability status for a specific part variant.

Description

The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time.

Additional features include automatic input power detection (active-low ACON output), logic-controlled enable, and temperature monitoring with an external thermistor. The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25V and 12V.

The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells. The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).

The MAX1925/MAX1926 are available in a 12-pin 4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.
MAX1925, MAX1926: Typical Operating Circuit MAX1925, MAX1926: Typical Operating Circuit Enlarge+

Key Features

  • Small (4mm x 4mm) Package
  • 4.25V to 12V Input Range (MAX1926)
  • Overvoltage Lockout at 6.1V (MAX1925)
  • ±0.75% Battery Regulation Voltage
  • Set Charge Current with One Resistor
  • Automatic Input Power Sense
  • LED (or Logic-Out) Charge Status and Fault Indicator
  • Programmable Safety Timer
  • Autorestart at Cell = 4V
  • Thermistor Monitor Input
  • Applications/Uses

    • Cradle Chargers
    • Digital Still Cameras
    • PDAs
    • Self-Charging Battery Packs
    Part NumberLithium Ion CellsProtected VIN
    (V)
    Charging VIN
    (V)
    Charge Rate Set byMax. ICHG
    (A)
    Charge TerminationCharge RegulationOper. Temp.
    (°C)
    Package/PinsBudgetary
    Price
    maxmaxSee Notes
    MAX1925 11212Resistor2TimerSwitchmode-40 to +85
    TQFN/12
    $1.71 @1k
    MAX1926 6.1
    TQFN/12
    See All Battery Chargers (74)
    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.


    MAX1926EVKIT: Evaluation Kit for the MAX1925, MAX1926

    Quality and Environmental Data

    Request Reliability Report for: MAX1925 
    Lead-Free Package Tin (Sn) Whisker Reports

    CAD Symbols and Footprints

  • MAX1925ETC+
  • MAX1925ETC+T
  • 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.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

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