EC49016-Standalone Linear Lithium Battery Charger

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
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode Required
Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating
Charges Single Cell Li-ion Batteries Directly from USB Port
Preset 4.22V Charge Voltage with +-1% Accuracy
20μA Supply Current in Shutdown
9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
Applications
Cellular Telephones, PDA, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
Pin Configurations

Ordering info

Typical Applications circuit


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