CXLB7251B是一款适用于单电池锂离子和锂聚合物电池的完整恒流恒压线性充电器。其SOT-23封装和低外部组件计数应用。此外，CXLB7251B是专门为在USB电源规范下工作而设计的。同时，CXLB7251B也可用于独立锂离子和锂聚合物电池充电器。由于内部MOSFET结构，不需要外部感测电阻，也不需要阻塞二极管。热反馈调节充电电流，以在高功率运行或高环境温度下限制模具温度。充电电压固定在4.35V，充电电流可通过一个电阻在外部编程。当达到最终浮充电压后，充电电流降至编程值的1/10时，CXLB7251B自动终止充电循环。当卸下输入电源（墙壁适配器或USB电源）时，CXLB7251B会自动进入低电流阶段，使电池放电电流降至小于2uA。CXLB7251BC可以进入关机模式，将电源电流降低到20uA。其他功能包括充电电流监视器、欠压锁定、自动充电和指示充电终止和输入电压存在的状态引脚。CXLB7251Bis故意设计为温度略为负。这为锂电池充电提供了额外的保护
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产品概述 返回TOP
CXLB7251B 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 applications. Furthermore, the CXLB7251B is specifically designed to work within USB power specification. At the same time, CXLB7251B 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 4.35V, and the charge current can be programmed externally with a single resistor. The CXLB7251B 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 CXLB7251B automatically enters a low current stage, dropping the battery drain current to less than 2uA. The CXLB7251Bcan be put into shutdown mode, reducing the supply current to 20uA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. CXLB7251Bis intentionally designed to have slightly negative Tempco. This provides extra protection to Lithium battery during charging.
产品特点 返回TOP
¾ Programmable Charge Current Up to 700mA.
¾ No MOSFET, Sense Resistor or Blocking Diode Required.
¾ Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating.
¾ Charges Single Cell Li-Ion Batteries Directly from USB Port.
¾ Preset 4.35V Charge Voltage with ±1% Accuracy.
¾ 20uA Supply Current in Shutdown.
¾ 2.9V Trickle Charge Threshold
¾ Soft-Start Limits Inrush Current.
¾ Available in 6-Lead SOT-23 Package.
¾ RoHS Compliant and 100% Lead (Pb)-Free
应用范围 返回TOP
¾ Cellular Telephones, PDA‘s, MP3 Players.
¾ Charging Docks and Cradles
¾ Bluetooth Applications
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产品封装图 返回TOP
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| 线性单节锂电充电IC | ||||||||
| 产品型号 | 输出电压 | 输入电压 | 最大充电电流 | 充电截止电压 | 精度 | 涓流充电截止电压 | 功耗 | 封装形式 |
| CXLB7244 | 4.2V | 4.5-12V | 200mA | 4.2V | ±1% | 2.9V | 55uA | SOT23-6 |
| CXLB7245DR | 4.2V | 4.5-6.0V | 300mA | 4.2V | ±1% | 2.9V | 350uA | DFN2*3-8 |
| CXLB7246DR | 4.2V | 4.25-6.5V | 200mA | 4.2V | ±1% | 2.9V | 350uA | DFN2*3-8 |
| CXLB7246MR | 4.2V | 4.25-6.5V | 200mA | 4.2V | ±1% | 2.9V | 150uA | SOT-25 |
| CXLB7247 | 4.2V | 4.25-6.5V | 1.2A | 4.2V | ±1% | 2.9V | 25uA | ESOP8 |
| CXLB7247ADR | 4.2V | 4.5-12V | 1A | 4.2V | ±1% | 2.9V | 55uA | DFN3*3-8 |
| CXLB7247B | 3.6V/4.2V | 4.25-6.5V | 1.2A | 3.6V-4.2V | ±1% | 2.9V | 25uA | ESOP8 |
| CXLB7247DR | 4.2V | 4.5V-8V | 1A | 4.2V | ±1% | 2.9V | 55uA | DFN3*3-8 |
| CXLB7248 | 4.2V | 4.25-6.5V | 800mA | 4.2V | ±1% | 2.9V | 25uA | SOT23-5 |
| CXLB7248B | 4.2V | 4.25-6.5V | 800mA | 4.2V | ±1% | 2.9V | 25uA | SOT23-5 |
| CXLB7248C | 4.2V | 4.25-6.5V | 500mA | 4.2V | ±1% | 2.9V | 25uA | SOT23-5 |
| CXLB7248D | 4.35V | 4.25-6V | 800mA | 4.35V | ±1% | 2.9V | 25uA | SOT23-5 |
| CXLB7249 | 4.2V | 4.25-6.5V | 800mA | 4.2V | ±1% | 2.9V | 85uA | SOT23-5 |
| CXLB7249B | 3.7V | 4-7V | 500mA | 3.7V | ±1% | 2.5V | 250uA | SOT23-5 |
| CXLB7249C | 2.8V | 4-7V | 500mA | 2.8V | ±1% | 2.0V | 250uA | SOT23-5 |
| CXLB7249D | 4.35V | 4.25-6.5V | 800mA | 4.35V | ±1% | 2.9V | 85uA | SOT23-5 |
| CXLB7250 | 4.2V | 4.0-8.0V | 1200mA | 4.2V | ±1% | 2.9V | 55uA | ESOP8 |
| CXLB7250A | 4.2V | 4.0-8.0V | 1200mA | 4.2V | ±1% | 2.9V | 55uA | ESOP8 |
| CXLB7250B | 4.35V | 4.0-8.0V | 1200mA | 4.35V | ±1% | 2.9V | 55uA | ESOP8 |
| CXLB7250C | 4.2V | 4.25-7.0V | 1000mA | 4.2V | ±1% | 2.9V | 55uA | ESOP8 |
| CXLB7250DR | 4.2V | 4.25-7.0V | 1000mA | 4.2V | ±1% | 2.9V | 50uA | DFN2X2-6L |
| CXLB7251 | 4.2V | 4.25-6.0V | 750mA | 4.2V | ±1% | 2.9V | 25uA | SOT23-6 |
| CXLB7251A | 4.2V | 4.25-6.0V | 800mA | 4.2V | ±1% | 2.9V | 25uA | SOT23-6 |
| CXLB7251B | 4.35V | 4.5-6.5V | 700mA | 4.35V | ±1% | 2.9V | 80uA | SOT-26 |
| CXLB7251C | 4.2V | 4.25-6.5V | 500mA | 4.2V | ±1% | 2.9V | 25uA | SOT-26 |
| CXLB7251D | 4.2V | 4.5-18V | 800mA | 4.2V | ±1% | 2.9V | 70uA | SOT-26 |
| CXLB7252 | 4.2V | 3.8-6.5V | 1A/0.5A | 4.2V | ±1% | 2.9V | 450uA | ESOP8/SOP8 |
| CXLB7253 | 4.2V | 4.5-7V | 扩流3A | 4.2V | ±1% | 2.9V | 1mA | SOP-8 |
| CXLB7366 | 4.2V | 4.5-12V | 700mA | 4.2V | ±1% | 2.9V | 55uA | SOT23-5 |
| CXLB7367 | 4.2V | 4.5-12V | 700mA | 4.2V | ±1% | 2.9V | 55uA | SOT23-6 |
| CXLB7254 | 4.2V | 4.25-6.5V | 1000mA | 4.2V | ±1% | 2.9V | 50uA | ESOP8 |
| CXLB7368 | 4.2V | 4.5-12V | 1000mA | 4.2V | ±1% | 2.9V | 55uA | ESOP8 |
| CXLB7255 | 4.2V | 4.5-5.5V | 800mA | 4.2V | ±1% | 2.9V | 48uA | DFN3*3-10 |
| CXLB7256 | 4.2V | 4.5V-18V | 1.3A | 4.2V | ±1% | 2.9V | 48uA | SOP8 |
| CXLB7256A | 4.2V | 4.5-18V | 1.6A | 4.2V | ±1% | 2.9V | 7uA | SOP-8 |
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