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.
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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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| 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 |
