1安培USB接口兼容的線性鋰離子電池充電器電路 (CN3056)

General Description:

The CN3056 is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer rechargeable batteries. The device contains an on-chip power MOSFET and eliminates the need for the external sense resistor and blocking diode. Furthermore, the CN3056 is specifically designed to work within USB power specifications. Its low external component count makes CN3056 ideally suited for portable applications.

Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The regulation voltage is fixed at 4.2V with 1% accuracy. The charge current can be programmed externally with a single resistor. When the input supply (wall
adapter or USB supply) is removed, the CN3056 automatically enters a low power sleep mode , dropping the battery drain current to less than 3uA.
Other features include undervoltage lockout, automatic recharge, chip enable function, battery temperature sensing and a pin to indicate
charge status.
The CN3056 is available in 10 pin QFN package.

Applications:

.. Cellular Telephones
.. Digital Still Cameras
.. MP3 Players
.. Bluetooth Applications
.. Portable Devices
.. USB Bus-Powered Chargers
.. Chargers

Features:

.. Charges Single Cell Li-Ion Batteries Directly from USB Port or AC Adaptor
.. On-chip Power MOSFET
.. No external Blocking Diode or Current Sense Resistors Required
.. Preset 4.2V Regulation Voltage with 1% Accuracy
.. Precharge Conditioning for Reviving Deeply Discharged Cells and Minimizing Heat Dissipation During Initial Stage of Charge
.. Programmable Charge Current Up to 1A
.. Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
.. Automatic Low-Power Sleep Mode When Input Supply Voltage is Removed
.. Status Indication for LEDs or uP Interface
.. C/10 Charge Termination
.. Automatic Recharge
.. Battery Temperature Sensing
.. Chip Enable Input
.. Available in 10 pin QFN Package
.. Pb-free Available

概述：

CN3056是可以對單節鋰離子或者鋰-聚合物可充電電池進行恒流/恒壓充電的充電器電路。該器件內部包括功率晶體管，應用時不需要外部的電流
檢測電阻和阻流二極管。CN3056只需要極少的外圍元器件，并且符合USB總線技術規范，非常適用于便攜式應用的領域。熱調制電路可以在器件的功耗比較大或者環境溫度比較高的時候將芯片溫度控制在安全范圍內。調制輸出電壓為4.2V，精度達1%。充電電流的大小可以通過一個外部電阻調整。當輸入電壓（交流適配器或者USB電源）
掉電時，CN3056自動進入低功耗的睡眠模式，此時電池的電流消耗小于3微安。其它功能包括輸入電壓過低檢測，自動再充電，芯片使能輸入端，電池溫度監控以及狀態指示等功能。

CN3056采用熱處理能力較強的10管腳QFN封裝。　

應用：

.. 移動電話
.. 數碼相機
.. MP3播放器
.. 藍牙應用
.. 電子詞典
.. 便攜式設備
.. 各種充電器

特點：

.. 可以用USB口或交流適配器對單節鋰離子或者鋰-聚合物可充電電池充電
.. 片內功率晶體管
.. 不需要外部阻流二極管和電流檢測電阻
.. 輸出電壓4.2V，精度可達1%
.. 為了激活深度放電的電池和減小功耗，在電池電壓較低時采用小電流的預充電模式
.. 用戶可編程的恒流充電電流可達1A
.. 采用恒流/恒壓/恒溫模式充電，既可以使充電電流最大化，又可以防止芯片過熱
.. 電源電壓掉電時自動進入低功耗的睡眠模式
.. 狀態指示輸出可驅動LED或與單片機接口
.. C/10充電結束檢測
.. 自動再充電
.. 電池溫度監測功能
.. 芯片使能輸入端
.. 封裝形式：10管腳QFN封裝
.. 無鉛產品
詳細說明及樣片申請：
hai-kl@163.com 段先生 13510249962