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EC49016-Standalone Linear Lithium Battery Charger

General description

EC49016  is  a  complete  constant-current  &  constant voltage  linear  charger  for  single  cell  lithium-ion  and  Lithium-polymer batteries. Its SOT-23 package and low  external component count make EC49016 ideally suited for portable applications. Furthermore, the EC49016 is specifically   designed   to   work   within   USB   power specification.  At the same  time, EC49016 can also be used in the standalone lithium-ion and Lithium-olymer
battery chargers.No  external  sense  resistor  is  needed,  and  no blocking diode is required due to the internal MOSFET architecture.  Thermal  feedback  regulates  the  charger current  to  limit  the  die  temperature  during  high  power operation  or  high  ambient  temperature.  The  charge voltage is fixed at 4.22V, and the charge current can be programmed  externally   with  a  single  resistor.  The EC49016  automatically  terminates  the  charge  cycle when    the    charge    current    drops    to    1/10 th the programmed   alue   after   the   final   float   voltage   is reached.When the input supply (wall adapter or USB supply) is  removed,  the  EC49016  automatically  enters  a  low current stage,dropping the battery drain current to less than  2μ A.  The  EC49016  can  be  put  into  shutdown mode, reducing the supply current to 20μ A.Other features include charge current monitor, under-voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. EC49016 is interntionally designed to have  slightly   negative Tempco.  This  provides  extra protection  to  Lithium battery during charging.

Features

 

l   Programmable Charge Current Up to 800mA

l   No MOSFET, Sense Resistor or Blocking Diode Required

l   Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating

l   Charges Single Cell Li-ion Batteries Directly from USB Port

l   Preset 4.22V Charge Voltage with +-1% Accuracy

l   20μA Supply Current in Shutdown

l   2.9V Trickle Charge Threshold

l   Soft-Start Limits Inrush Current

l   Available in 5-Lead SOT-23 Package

Applications

l   Cellular Telephones, PDA, MP3 Players

l   Charging Docks and Cradles

l   Bluetooth Applications

Pin Configurations

Ordering info

Typical Applications circuit

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