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芯片型号 输入(V) 输出(V) 电流(A) 效率 MOS 应用/保护功能 封装 包装(盘) 规格书 状态 样品
QT3300 4v-28v adj 2A 90%以上 外挂 磷酸铁锂/锂电充电管理 SOT23-6 3000 量产 申请

* 上方QT3300芯片参数仅供参考,详细技术参数请以QT3300技术规格书为准

QT3300一款工作于4V到28V的PFM升压型电池充电控制集成电路。QT3300内部集成有基准电压源,+5V电压调制单元,电感电流检测单元,电池电压检测电路和片外N沟道MOSFET驱动电路等,非常适合锂电池,磷酸铁锂电池和铅酸电池的充电控制,具有外部元件少,电路简单等优点。当接通输入电源后,QT3300进入充电状态,
QT3300-5v升压8.4v充电管理芯片
控制片外N沟道MOSFET导通,电感电流上升,输出电容中的能量转移到电池中。当电感电流上升到外部电流检测电阻设置的上限时,片外N沟道MOSFET截止,电感电流下降,电感中的能量转移到输出电容和电池中。当电感电流下降到外部电流检测电阻设置的下限时,片外N沟道MOSFET再次导通,如此循环。电池电压经过电阻分压网络反馈到FB管脚,当FB管脚电压达到1.205V(典型值)时,充电过程结束,片外N沟道MOSFET截止,进入充电结束状态。在充电结束状态,没有电流从输入端流向电池。当FB管脚电压下降到再充电阈值1.155V(典型值)时,QT3300再次进入充电状态。QT3300最高工作频率可达1MHz。

QT3300 is a PFM boost battery charging control integrated circuit that operates from 4V to 28V. The QT3300 integrates a reference voltage source, +5V voltage modulation unit, inductor current detection unit, battery voltage detection circuit and off-chip N-channel MOSFET drive circuit, etc., which are very suitable
The charging control of lithium batteries, lithium iron phosphate batteries and lead-acid batteries has the advantages of fewer external components and simple circuits. When the input power is turned on, QT3300 enters the charging state, controls the off-chip N-channel MOSFET to turn on, the inductor current rises, and the energy in the output capacitor is transferred to the battery. When the inductor current rises to the upper limit set by the external current detection resistor, the off-chip N-channel MOSFET is turned off, the inductor current decreases, and the energy in the inductor is transferred to the output capacitor and battery. When the inductor current drops to the lower limit set by the external current detection resistor, the off-chip N-channel MOSFET turns on again, and so on. The battery voltage is fed back to the FB pin through the resistor divider network. When the FB pin voltage reaches 1.205V (typical value), the charging process ends, the off-chip N-channel MOSFET is turned off, and the charging end state is entered. In the end-of-charge state, no current flows from the input to the battery. When the FB pin voltage drops to the recharge threshold 1.155V (typical value), QT3300 enters the charging state again. The maximum operating frequency of QT3300 can reach 1MHz.



QT3300常用应用:

5v升压充电8.4v 
 
5v升压充电12.6v
 
5v升压充电16.8v


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