丝印 UN8HX 首鼎 SD8054 恒流/恒压线性充电IC
 
 
 
 
  

    Description 
  
 
  

    The SD8054 is a complete constant-current/ constant voltage linear charger for single cell 
  
 
  

 xternal component count make the SD8054 i  rmore, the SD8054 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 
  
 
  


  
 
  

    regulates the charge current to limit the die 
  
 
  

    temperature during high power operation or 
  
 
  


  
 
  

    is fixed at 4.2V, and the charge current can be 
  
 
  

    programmed externally with a single resistor. 
  
 
  

    The SD8054 automatically terminates the 
  
 
  
 
   

     charge cycle when the charge current drops to 
   
 
   

     1/10th the programmed value after the final float 
   
 
   

     voltage is reached. 
   
 
  
 
  
 
   

     Features 
   
 
   

     
 
   
 
   

     Programmable Charge Current Up to 
   
 
   

     800mA 
   
 
   

     
 
   
 
   

     No MOSFET, Sense Resistor or Blocking 
   
 
   

     Diode Required 
   
 
   

     
 
   
 
   

     Complete Linear Charger for Single Cell 
   
 
   

     Lithium-Ion Batteries 
   
 
   

     
 
   
 
   

     Constant-Current/Constant-Voltage 
   
 
   

     Operation with Thermal Regulation* to 
   
 
   

     Maximize Charge Rate 
   
 
   

     
 
   
 
   

     Without Risk of Overheating 
   
 
   

     
 
   
 
   

     Charges Single Cell Li-Ion Batteries 
   
 
   

     Directly from USB Port 
   
 
   

     
 
   
 
   

     Preset 4.2V Charge Voltage with 1% 
   
 
   

      Accuracy 
   
 
   

     
 
   
 
   

     Automatic Recharge 
   
 
   

     
 
   
 
   

     65uA Supply Current in Shutdown 
   
 
   

     
 
   
 
   

     2.9V Trickle Charge Threshold 
   
 
   

     
 
   
 
   

     Available in 5-Lead SOT-23 Package 
   
 
   

     Applications 
   
 
   

     
 
   
 
   

     Charger for Li-Ion Coin Cell Batteries 
   
 
   

     
 
   
 
   

     Portable MP3 Players, Wireless Headsets 
   
 
   

     
 
   
 
   

     Bluetooth Applications 
   
 
   

     
 
   
 
   

     Multifunction Wristwatches