CXLB7228 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 CXLB7228
ideally suited for portable applications. Furthermore, the CXLB7228 is specifically designed to work within
USB power specification. At the same time, CXLB7228 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 CXLB7228 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 CXLB7228 automatically enters a low
current stage, dropping the battery drain current to less than 2uA. The CXLB7228 can be put into shutdown mode,
reducing the supply current to 20uA.
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目录
1.产品概述 2.产品特点 3.应用范围 4.技术规格书下载（PDF文档）
一.产品概述
CXLB7228 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 CXLB7228
ideally suited for portable applications. Furthermore, the CXLB7228 is specifically designed to work within
USB power specification. At the same time, CXLB7228 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 CXLB7228 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 CXLB7228 automatically enters a low
current stage, dropping the battery drain current to less than 2uA. The CXLB7228 can be put into shutdown mode,
reducing the supply current to 20uA.
Other features include charge current monitor,undervoltage lockout, automatic recharge and astatus pin to indicate
charge termination and the presence of an input voltage. CXLB7228 is intentionally designed to have slightly negative
Tempco. This provides extra protection to Lithium battery during charging.
二.产品特点
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 6-Lead SOT-23 Package.
RoHS Compliant and 100% Lead (Pb)-Free
三.应用范围
Cellular Telephones, PDA’s, MP3 Players.
Charging Docks and Cradles
Bluetooth Applications
四.技术规格书（产品PDF)
需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！
五.产品封装图
六.电路原理图
七.相关芯片选择指南
| 系列名称 | 输入电压 (V) | 输出电压 (V) | 最大输出电流 (mA) | 封装 | 特点 | ||||
| 最小 | 标准 | 最大 | 最小 | 标准 | 最大 | ||||
| CXLB7225 | 4.5 | 5 | 12 | 4.2 | 1000 | ESOP8 | 12V耐压；内置MOS单节锂电充电；有电池正负极反接保护、输入电压过保护、输出短路保护这三在保护功能； | ||
| CXLB7224 | 4.5 | 5 | 12 | 4.2 | 700 | SOT23-6 | 12V耐压；内置MOS单节锂电充电；有电池正负极反接保护、输入电压过保护、输出短路保护这三在保护功能； | ||
| CXLB7236 | 4.5 | 5 | 7 | 4.35 | 1000 | ESOP8 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1A；带EN控制脚；固定充电结束电压4.35V； | ||
| CXLB7237 | 4.5 | 5 | 7 | 4.35 | 700 | SOT23-6 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1A；带EN控制脚；固定充电结束电压4.35V； | ||
| CXLB7229 | 4 | 5 | 7 | 可调 | 1000 | ESOP8 | 8V耐压；单节磷酸铁锂电池充电；4.5V电压输入充电电流可达1A；带EN控制脚；电池充电结束电压可调（3.6V-4.5V) ； | ||
| CXLB7232 | 4.5V | 5V | 12V | 可调 | 1600 | ESOP8 | 18V耐压；内置MOS管单节锂电充电；5V电压输入充电电流可达1.6A；大小电流充电切换控制，切换小电流是设定电流的65%；输出充电结束电压可调（4.2V-4.8V)； | ||
| CXLB7233 | 4.5V | 5V | 12V | 可调 | 1600 | ESOP8 | 18V耐压；内置MOS管单节锂电充电；5V电压输入充电电流可达1.6A；带EN控制脚；输出充电结束电压可调（4.2V-4.8V)； | ||
| CXLB7235S | 4.5V | 5V | 12V | 可调 | 1300 | ESOP8 | 18V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1.3A；输出充电结束电压可调（4.2V-4.8V)； | ||
| CXLB7234S | 4.5V | 5V | 12V | 可调 | MOS而定 | SOP8 | 18V耐压；外置MOS管单节锂电充电；5V电压输入充电电流可达1.3A；输出充电结束电压可调(4.2V-4.8V)； | ||
| CXLB7239 | 4.5V | 5V | 12V | 可调 | MOS而定 | SOP8/MSOP8 | 18V耐压；外置MOS单节锂电充电；外置MOS双节锂电充电；5V电压输入充电电流可达1.3A；9V电压输入充电电流可达1A；带电池温度监控；电池内阻补偿；输出充电结束电压可调（单节4.2V-4.8V)、（双节8.4V-8.8V)； | ||
| CXLB7227 | 4.5V | 5V | 7V | 可调 | 1000 | ESOP8 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1A；带EN控制脚；输出充电结束电压可调(4.2V-4.8V)； | ||
| CXLB7226 | 4.5 V | 5V | 7V | 固定 | 1000 | ESOP8 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1A；带EN控制脚；固定充电结束电压4.2V ； | ||
| CXLB7238 | 4.5V | 5V | 7V | 固定 | 600 | ESOT23-5 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达600mA；带EN控制脚；固定充电结束电压4.2V ； | ||
| CXLB7228 | 4.5V | 5V | 7V | 固定 | 700 | SOT23-6 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达600mA；带EN控制脚；固定充电结束电压4.2V ；双LED充电状态指示 | ||
| CXLB7230 | 4.5V | 5V | 7V | 可调 | 1000 | DFN8 | 8V耐压；内置MOS单节锂电充电；5V电压输入充电电流可达1A；带EN控制脚；输出充电结束电压可调(4.2V-4.8V)； | ||
| CXLB7219 | 4.5V | 5V | 7V | 固定 | 1000 | 耐压12V单节锂电充电芯片，5V输入充电电流可达1A，带芯片温度过热保护、电池正负极反接保护、VIN过压保护、BAT短路保护；BAT短路后芯片停止工作,无电池时输出电压稳定、指示灯不闪，适应电子烟和玩具上各种充电器。 | |||
| CXLB7220 | 4.5V | 5V | 7V | 固定 | 3ma~200ma | 耐压12V单节小电流锂电充电芯片，兼容3mA--200mA的可编程充电电流，带芯片温度过热保护、电池正负极反接保护、VIN过压保护、BAT短路保护；BAT短路后芯片停止工作。 | |||
| CXLB7221 | 4.5V | 5V | 7V | 固定 | 1000 | 耐压12V单节锂电充电芯片，5V输入充电电流可达1A，带芯片温度过热保护、电池正负极反接保护、VIN过压保护、BAT短路保护；BAT短路后芯片停止工作 | |||
| CXLB7222 | 4.5V | 5V | 7V | 固定 | 1000 | 小封装充电IC,耐压12V单节充电管理IC，5V输入充电电流可达1A，带电池正负极反接保护充电芯片、温度过热保护、VIN过压保护、BAT短路保护；BAT短路后芯片停止工作，输出电压可调充电IC。 | |||
| CXLB7223 | 4.5V | 5V | 7V | 固定 | 500 | 耐压12V单节充电管理IC，5V输入充电电流可达500mA，带防反接充电IC、温度过热保护、VIN过压保护、BAT短路保护；BAT短路后芯片停止工作 | |||
| CXLB7231 | 4.5V | 5V | 7V | 固定 | 1000 | 外置MOS耐压18V单节锂电池充电IC，5V输入充电电流可达1A，有BAT短路提示功能，充电双灯指示，电池温度检测、电池内阻补偿，BAT充饱电压可调 | |||
