ME4064A  is  a  complete  constant-current/constant voltage  linear  charger  for  single  cell  lithium-ion batteries.  Furthermore  the  ME4064A  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 PMOSFET  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  ME4064A  automatically terminates  the charge cycle when  the charge current drops to 1/10th the programmed value after the final float voltage is reached.

● Preset 4.2V charge voltage with ± 1% accuracy
● Automatic Recharge
●Charges  Single  Cell  Li-Ion  Batteries  Directly  from USB Port
●C/10 charge termination
● 55μA supply current in shutdown
● 2.9V trickle current charge threshold
● Soft-Start limits inrush current
●Charge Status Output Pin
●Available in SOT23-5 Package