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发布者:微桥PT6112 发布时间:2010-11-26 阅读:6289次    关键字: PT6112 PT6102 PT6102 PT6160 微桥 锂电池充电
PT6112-Standalone Linear Li-Ion Battery Charger


 
概述
    PT6112是一款高度集成的单节锂离子电池充电器,较少的外部元件数目使得它非常适合于便携式应用。内部集成功率管,不需要外部检测电阻和防倒灌二极管。充电电流通过外部电阻进行设置,充电结束电压固定在4.2V。热反馈可以自动调节充电电流,可以在大功率或高环境温度下对芯片加以保护。

    PT6112 分三个阶段对电流进行充电:当电池电压低于2.9V时是涓流充电,当电池电压大于2.9V时是恒流充电,并且涓流充电电流是恒流充电电流的1/10,当电池电压到4.2V时进行恒压充电,在恒压充电过程中,充电电流逐渐减少,当减少到恒流充电电流的1/10时,结束充电过程。

关键特性
  • 可以用USB端口直接对单节电池进行充电
  • 充电电流最大可以到800mA
  • 无需外部功率管,检测电阻和防倒灌二极管
  • 涓流、恒流、恒压三阶段,并有热调节功能,可以在无过热的情况下最大化充电电流
  • 精度达±1%的4.2V充电电压
  • SOT23-5和ESOP8封装
典型应用电路

GENERAL DESCRIPTION

    The PT6112 is a highly integrated Li-ion battery linear charging management device targeted at space limited portable applications. The PT6112 offers an integrated MOSFET and current sensor, reverse blocking protection, high accuracy current and voltage regulation, charge status indication, and charge termination in a SOT23 or ESOP8 package. The PT6112 has low external component count. The PT6112 charges a battery in three phases: trickle charging, constant current, and constant voltage. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. The thermal feedback regulates the charging current to limit the chip temperature during high power operation or high ambient temperature to maximize the charge rate without risk of overheating . The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The PT6112 automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. The PT6112 automatically re-starts the charge if the battery voltage falls below an internal threshold.
 
 FEATURES
 

l         Charges Single Cell Li-Ion Batteries Directly from USB Port

l         Programmable Charge Current Up to 800mA

l         No MOSFET, Sense Resistor or Blocking Diode Required

l         Complete Linear Charger in SOT23-5 or ESOP8 Package for Single Cell Lithium-Ion Batteries

l         Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating

l         Preset 4.2V Charge Voltage with ±1% Accuracy
 
 APPLICATIONS
 

l        Cellular Telephones, PDAs, MP3 Players

l        Bluetooth Applications

l        Digital Cameras

l        Charging Docks and Cradles
 
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  • 上篇文章SS54(5A/40V),SS56(5A/60V),肖特基二极管
  • 下篇文章PT6102-单节线性锂电池充电管理IC
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