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单节充电管理

CST4084

CST4084是一款完整的恒流/恒压线性充电器,适用于单节锂离子电池。其SOT封装和低外部元件数量使CST4084非常适合便携式应用。充电电压固定在4.2V,充电电流可通过单个电阻器在外部编程。当达到最终浮子电压后,充电电流下降到程序设定值的1/10时,CST4084自动终止充电周期。
CST4084可置于关断模式,将电源电流降低至35μA。
    CST4084 General Description:
        The CST4084 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. 
        Its SOT package and low external component count make the CST4084 ideally suited for portable applications. Furthermore, the CST4084 is specifically designed to work within USB power specifications.No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor.
        The CST4084 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the CST4084 automatically enters a low current state, dropping the battery drain current to less than 1μA.
        The CST4084 can be put into shutdown mode, reducing the supply current to 35μA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.

    CST4084 Features:
    Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating 
    No MOSFET, Sense Resistor or Blocking Diode Required 
    Complete Linear Charger in SOT Package for Single Cell Lithium-Ion Batteries 
    Charges Single Cell Li-Ion Batteries Directly from USB Port 
    Charge Current Monitor Output for Gas Gauging
    Programmable Charge Current Up to 800mA 
    Charge Status Output Pin 
    C/10 Charge Termination 
    Automatic Recharge 
    Preset 4.2V Charge Voltage with ±1% Accuracy 
    35µA Supply Current in Shutdown 
    2.9V Trickle Charge Threshold 
    Soft-Start Limits Inrush Current 
    Available in 5-Lead SOT-23 Package 
    RoHS Compliant and Lead (Pb) Free

    CST4084 Applications:
    Cellular Telephones 
    Charging Docks and Cradles
    Bluetooth Application 
    Wearable Application

    CST4084Typical Application Circuit:

    CST4084
    Pin Configuration:

    CST4084
    Pin Description:

    CST4084 Order Information:
    Marking
    Part No.
    Model
    Description
    Package
    T/R Qty
    C84AS
     
    cst4084

    cst4084 Linear Li-Ion Battery Charger, 800mA, Preset 4.2V, 1 Charge Status, SOT23-5

    SOT23-5
    3000 PCS
    CST4084Functional Block Diagram:

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