相关商品： BQ2057

SE9016概述
SE9016是恒流/恒压线性充电芯片,主要面向单节锂电池充电应用。SE9016采用SOT23的小型封装和最少的外部元件数量非常适合便携设备的应用。SE9016可通过USB对电池进行供电,同时也可以用作独立的锂电池充电器。SE9016无需外接感应电阻,同时由于内部MOSFET结构,因此无需外接反向二极管。热反馈电路使SE9016在大功率和高环境温度下可以调节充电电流以限制芯片温度。SE9016的充电电压固定为4.2V,充电电流可以通过外部电阻设定。当达到浮充电压并且充电电流下降到设定电流的1/10时,SE9016自动终止充电过程。当输入电压移开之后,SE9016自动进入低电流模式,从电池吸取少于2uA的电流。当SE9016进入待机模式时,供电电流小于25uA。SE9016还可监控充电电流,具有电压检测、自动循环充电的特性,并且具有一个指示管脚指示充电终止状态和输入电压状态。

SE9016主要特点:
· 最大800mA的可编程充电电流
· 无需外接MOSFET、感应电阻、反向二极管
· 恒流/恒压模式操作,具有热保护功能
· 可通过USB端口为单节锂电池充电
· 具有1%精度的预设充电电压
· 待机模式下消耗25uA的电流
· 2.9V涓流充电电压
· 软启动
· SOT23

SE9016 Description 
     SE9016 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 SE9016 ideally suited for portable applications.  Furthermore, the SE9016 is specifically designed to work within USB power specification.   At the same time, SE9016 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 4.2V, and the charge current can be programmed externally with a single resistor.  The SE9016 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 SE9016 automatically enters a low current stage, dropping the battery
drain current to less than 2uA.   The SE9016 can 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. SE9016 is intentionally designed to have slightly negative Tempco. This provides extra protection to Lithium battery during charging.

 

SE9016 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 4.2V Charge Voltage with ±1% Accuracy.
· 20uA Supply Current in Shutdown.
· 2.9V Trickle Charge Threshold
· Soft-Start Limits Inrush Current.
· Available in 5-Lead SOT-23 Package.
· RoHS Compliant and 100% Lead (Pb)-Free 

 
SE9016 Application
· Cellular Telephones, PDA’s, MP3 Players.
· Charging Docks and Cradles
· Bluetooth Applications

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