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(jié)鋰離子或者鋰-聚合物可充電電池進(jìn)行恒流/恒壓充電的充電器電路。該器件內(nèi)部包括功率晶體管，應(yīng)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(shù)規(guī)范，非常適用于便攜式應(yīng)用的領(lǐng)域。熱調(diào)制電路可以在器件的功耗比較大或者環(huán)境溫度比較高的時候?qū)⑿酒瑴囟瓤刂圃诎踩�范圍�?nèi)。調(diào)制輸出電壓為4.2V，精度達(dá)1%。充電電流的大小可以通過一個外部電阻調(diào)整。當(dāng)輸入電壓（交流適配器或者USB電源）
掉電時，CN3056自動進(jìn)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(jiān)控以及狀態(tài)指示等功能。

CN3056采用熱處理能力較強(qiáng)的10管腳QFN封裝。　

應(yīng)用：

.. 移動電話
.. 數(shù)碼相機(jī)
.. MP3播放器
.. 藍(lán)牙應(yīng)用
.. 電子詞典
.. 便攜式設(shè)備
.. 各種充電器

特點(diǎn)：

.. 可以用USB口或交流適配器對單節(jié)鋰離子或者鋰-聚合物可充電電池充電
.. 片內(nèi)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(dá)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(yù)充電模式
.. 用戶可編程的恒流充電電流可達(dá)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(jìn)入低功耗的睡眠模式
.. 狀態(tài)指示輸出可驅(qū)動LED或與單片機(jī)接口
.. C/10充電結(jié)束檢測
.. 自動再充電
.. 電池溫度監(jiān)測功能
.. 芯片使能輸入端
.. 封裝形式：10管腳QFN封裝
.. 無鉛產(chǎn)品
詳細(xì)說明及樣片申請：
hai-kl@163.com 段先生 13510249962