相关商品： BQ2057

OCP8020 Description
 OCP8020 is a complete constant-current and constant-voltage linear charger for single cell lithium-ion and Lithium-Polymer batteries. Its SOT23-5L Package and low external component count make OCP8020 ideally suited for portable applications. Furthermore, the OCP8020 is specifically designed to work within USB power specification. At the same time, OCP8020 can also be used in the standalone lithium-ion and Lithium-polymer battery charger.
      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 4.2V, and the charge current can be programmed externally with a single resistor. The OCP8020 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached.
      When the input supply (wall adapter or USB supply) is removed, the OCP8020 automatically enters a low current stage, dropping the battery drain current to less than 2μA. The OCP8020 can be put into shutdown mode, reducing the supply current to 25μA.
      Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate termination and the presence of an input voltage.
 

OCP8020 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
·Press 4.2V Charge Voltage with ± 1% Accuracy
·25μA. Supply Current in Shutdown
·2.9V Trickle Charge Threshold
·Available Without Trickle Charge
·Soft-Start Limits Inrush Current
·Available in 5-pin SOT23 Package 

 
OCP8020 Applications
·Cellular Telephones, PDA’s, MP3 Players
·Charging Docks and Cradles
·Bluetooth Applications

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