General Description
 
 
 
 
  
 
   
 
The SD8055 is a completeconstant-current/constantvoltage
 
linear charger for single cell lithium-ion batteries.
 
Its ThinSOT package and low external component count make the SD8055 ideally suited for portable , pecifically designed to work within USB power specifications.
 
No external sense resistor is needed, and no blocking
 
diode is required due to the internal MOSFET
 
 
current to limit the die temperature during high power
 
 
voltage is fixed at 4.2V, and the charge current can be
 
programmed  automatically terminates the charge cycle when the charge current drops to 1/10th the programmed
 
 
input supply (wall adapter or USB supply) is removed automatically ent ers a low current state dropping the battery drain current to less than 2μ can be put into shut down mode, reducing he
 
supply current to 25μ
 
current monitor, undervoltage lockout, automatic
 
recharge and a status pin to indicate charge termination and the presence of an input voltage.
 
 
  
 
 
 
 

  Features 
 

  — Programmable Charge Current Up to 600mA 
 

  — No MOSFET, Sense Resistor or Blocking Diode 
 

  Required 
 

  — Complete Linear Charger in ThinSOT 
 

  Package 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 ± 1.5% Accurac y 
 

  — Charge Current Monitor Output for Gas 
 

  Gauging 
 

  — Automatic Recharge 
 

  — Soft-Start Limits Inrush Current 
 

  — Available in 5-Lead SOT-23 Package 
 

  — 2.9V Trickle Charge Threshold 
 

  — C/10 Charge Termination 
 

  — 25uA Supply Current in Shutdown 
 

  — 2.9V Trickle Charge Threshold 
 

  Applications 
 

  — Portable Media Players/MP3 players 
 

  — Cellular and Smart mobile phone 
 

  — Charging Docks and Cradles 
 

  — Bluetooth Applications