Cxlb7271 is a PWM Buck mode dual lithium battery charging management integrated circuit, which can independently and automatically manage the lithium battery charging. It has the advantages of small package, few peripheral components and simple use. The cxlb7271 has constant current and constant voltage charging mode, which is very suitable for the charging and constant voltage charging mode of lithium battery. The cxlb7271 modulates the battery voltage at 8.4v with an accuracy of ?1%; in the constant current charging mode, the charging current is set through an external resistance. For deep discharge lithium battery, when the battery voltage is lower than 5.6v, cxlb7271 uses 15% of the set constant current charging current to trickle charge the battery. In the constant voltage charging stage, the charging current decreases gradually. When the charging current decreases to the value set by the external resistance, the charging ends. At the end of charging state, if the battery voltage drops to 4V / KT, a new charging cycle will be started automatically. When the input power supply is powered down or the input voltage is lower than the battery voltage, the cxlb7271 automatically enters the sleep mode of low power consumption
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[ CXLB7271 ]"
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CXLB7271 5A 双节锂电池充电管理集成电路, |
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产品简介 规格书下载 免费样品申请 |
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概述： |
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CXLB7271是PWM降压模式双节锂电池充电管理集成电路，独立对锂电池充电进行全面自动管理，具有封装外形小,外围元器件少和使用简单等优点。CXLB7271具有恒流和恒压充电模式，非常适合锂电池的充电恒压充电模式，CXLB7271将电池电压调制在8.4V，精度为±1%；在恒流充电模式,充电电流通过一个外部电阻设置。对于深度放电的锂电池,当电池电压低于5.6V时，CXLB7271用所设置的恒流充电电流的15%对电池进行对电池进行涓流充电。在恒压充电阶段,充电电流逐渐减小，当充电电流降低到外部电阻所设置的值时,充电结束。在充电结束状态，如果电池电压下降到4V/节时，自动开始新的充电周期。当输入电源掉电或者输入电压低于电池电压时，CXLB7271自动进入低功耗的睡眠模式。其它功能包括输入低电压锁存，电池温度监测，电池端过压保护和充电状态指示等。CXLB7271采用16管脚TSSOP封装。 |
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应用： |
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便携式DVD,对讲机 |
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笔记本电脑 |
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备用电池应用 |
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便携式工业和医疗仪器 |
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独立电池充电器 |
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特点： |
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宽输入电压范围：7.5V 到 28V |
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充电电流达5A |
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对两节锂电池完整的充电管理 |
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PWM开关频率：300KHz |
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恒压充电电压精度：±1% |
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恒流充电电流由外部电阻设置 |
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对深度放电的电池进行涓流充电 |
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电结束电流可由外部电阻设置 |
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电池温度监测功能 |
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自动再充电功能 |
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软启动功能 |
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电池端过压保护 |
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工作环境温度：－40℃到＋85℃ |
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采用16管脚TSSOP封装 |
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产品无铅，无卤素元素，满足RoHS |
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产品封装图： |
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产品原理图： |
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单节锂电池充电芯片选型指南： |
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型号 |
电池种类/串联数量 |
工作模式 |
最高输入电压 |
最大持续充电电流 |
充电结束判断 |
封装 |
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锂电池/2 |
开关模式 |
30V |
4A |
最小充电电流 |
SSOP10 |
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锂电池/多节 |
开关模式 |
4V到28V |
最大输出功率25W |
设置结束电压 |
SOT23-6 |
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锂电池/2 |
开关模式 |
+28V |
5A |
最小充电电流 可外部设置 |
TSSOP16 |
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锂电池、磷酸铁锂电池/多节 |
开关模式 |
+28V |
5A |
最小充电电流 可外部设置 |
TSSOP16 |
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锂电池、磷酸铁锂电池/多节 |
开关模式 |
+28V |
5A |
最小充电电流 可外部设置 |
TSSOP16 |
