CN3052B—小功率充電方案

General Description:

The CN3051B/CN3052B 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
CN3051B/CN3052B is specifically designed to work within USB power specifications. Its low external component count makes CN3051B/CN3052B 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 4.1V(CN3051B) or 4.2V(CN3052B) 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 CN3051B/CN3052B 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 CN3051B/CN3052B is available in 8-pin MSOP package(MSOP8).


Applications:

.. MP3 Players
.. Bluetooth Applications
.. Toys
.. USB Bus-Powered 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 4.1V or 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 150mA
.. 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 MSOP8 Package
.. Pb-free Available

(中文)
150毫安USB接口兼容的線性鋰離子電池充電器電路---CN3051B/CN3052B
特點：
CN3051B/CN3052B:
　-可以用USB口或交流適配器對單節鋰離子或者鋰-聚合物電池充電
　-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4.1V或4.2V，精度可達1%
　-在電池電壓較低時采用小電流的預充電模式充電
　-用戶可編程的恒流充電電流可達150mA
　-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
　-封裝形式MSOP8
　-應用：
　　　1. MP3播放器
　　　2. 藍牙應用
　　　3. 玩具
　　　4. 鋰電池充電器

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