EC49017-Standalone Linear Lithium Battery Charger

EC49017-Standalone Linear Lithium Battery Charger
General description
EC49017 is a complete constant-current & constant voltage linear charger for single cell lithium-ion and Lithium-Polymer batteries. Its SOT23 package and low external component count make EC49017 ideally suited for portable applications. thermore, the EC49017 is specifically designed to work within USB power specification. At the same time, EC49017 can also be used in the standalone lithium-ion and ithium-polymer battery chargers.No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET 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 4.22V, and the charge current can be programmed externally with a single resistor.The EC49017 automatically inates the charge cycle when the charge current drops to 1/10 th the programmed value after the final float voltage is reached.When the input supply (wall adapter or USB supply) is removed, the EC49017 automatically enters a low current stage, opping the battery drain current to less than 2uA. The EC49017 can be put into hutdown mode, reducing the supply current to 20uA. Other features include charge current onitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. EC49017 is intentionally 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 6-Lead SOT23 and SOP-8(Exposed PAD) Packages
RoHS Compliant and 100% Lead Pb free
Applications
Cellular Telephones, PDA, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
Pin Configurations

Ordering info

Typical Applications circuit


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