CXLB7251B 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 applications.

   产品概述 返回TOPRR0嘉泰姆

CXLB7251B 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 applications. Furthermore, the CXLB7251B is specifically designed to work within USB power specification. At the same time, CXLB7251B can also be used in the standalone lithium-ion and Lithium-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 4.35V, and the charge current can be programmed externally with a single resistor. The CXLB7251B 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 CXLB7251B automatically enters a low current stage, dropping the battery drain current to less than 2uA. The CXLB7251Bcan be put into shutdown mode, reducing the supply current to 20uA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. CXLB7251Bis intentionally designed to have slightly negative Tempco. This provides extra protection to Lithium battery during charging.

   产品特点 返回TOPRR0嘉泰姆

¾ Programmable Charge Current Up to 700mA. RR0嘉泰姆

¾ No MOSFET, Sense Resistor or Blocking Diode Required. RR0嘉泰姆

¾ Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating. RR0嘉泰姆

¾ Charges Single Cell Li-Ion Batteries Directly from USB Port. RR0嘉泰姆

¾ Preset 4.35V Charge Voltage with ±1% Accuracy. RR0嘉泰姆

¾ 20uA Supply Current in Shutdown. RR0嘉泰姆

¾ 2.9V Trickle Charge ThresholdRR0嘉泰姆

¾ Soft-Start Limits Inrush Current. RR0嘉泰姆

¾ Available in 6-Lead SOT-23 Package. RR0嘉泰姆

¾ RoHS Compliant and 100% Lead (Pb)-FreeRR0嘉泰姆

   应用范围 返回TOPRR0嘉泰姆

¾ Cellular Telephones, PDA‘s, MP3 Players. RR0嘉泰姆

¾ Charging Docks and Cradles RR0嘉泰姆

¾ Bluetooth ApplicationsRR0嘉泰姆

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