CXLB7391电流模式PWM降压交换式架构恒定电流恒定电压锂离子电池充电器固定500kHz开关频率充电电流终止指示输出电池低电压涓流充电自动电池重置低功耗休眠模式电池温度检测

CXLB7391是一款使用电流模式PWM操作降压交换式架构的恒定电流，恒定电压的锂离子电池充电器，其工作频率为恒定的500kHz。可提供单节(4.2V)或双节(8.4AV)锂离子电池充电。它设定包含涓流，恒流与恒压三个阶段充电，使用外部侦测电阻进行±10%精度的充电电流调节，其内部使用分压电路与精准的参考电压进行每节电池4.2V±1%精度的充电终止电压控制。 内部比较电路进行充电终止条件检测，当充电电流小于EOC(end-of-charge)或者内部定时器计时终止都将停止充电循环。CXLB7391将检测单节电池电压是否小于4.05V来判断是否自动重置充电循环。当直流输入电源移除时，CXLB7391自动进入休眠模式以减少电池端的供电电流。

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）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

 

CXLB7391是一款使用电流模式PWM操作降压交换式架构的恒定电流，恒定电压的锂离子电池充电器，其工作频率为恒定的500kHz。可提供单节(4.2V)或双节(8.4AV)锂离子电池充电。它设定包含涓流，恒流与恒压三个阶段充电，使用外部侦测电阻进行±10%精度的充电电流调节，其内部使用分压电路与精准的参考电压进行每节电池4.2V±1%精度的充电终止电压控制。 内部比较电路进行充电终止条件检测，当充电电流小于EOC(end-of-charge)或者内部定时器计时终止都将停止充电循环。CXLB7391将检测单节电池电压是否小于4.05V来判断是否自动重置充电循环。当直流输入电源移除时，CXLB7391自动进入休眠模式以减少电池端的供电电流。CXLB7391提供SOP-8与TDFN-10封装。

The CXLB7391 is a constant current, constant voltage Li-Ion battery charger controller that uses a current mode PWM step-down (buck) switching architecture. With a 500kHz switching frequency, the CXLB7391 provides a small, simple and efficient solution to fast charge one (4.2V) or two (8.4V) cell lithium-ion batteries. The CXLB7391 charges the battery in three phases: conditioning, constant current, and constant voltage. An external sense resistor sets the charge current with ±10% accuracy. An internal resistor divider and precision reference set the final float voltage to 4.2V per cell with ± 1% accuracy. An internal comparator detects the near end-of-charge condition while an internal timer sets the total charge time and terminates the charge cycle. The CXLB7391 automatically re-starts the charge if the battery voltage falls below an internal threshold, 4.05V per cell. The ECXLB7391also automatically enters sleep mode when DC supplies are removed. The ECXLB7391is available in the 8-lead SOP and 10-lead TDFN packages.   

产品特点 返回TOP

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   • 宽输入电压范围：

4.8V to 20V–4.2 Version

8.9V to 20V–8.4 Version

8.9V to 20V–8.4A Version

• 固定500kHz开关频率

• 充电电流终止指示输出

• 七小时的安全充电止计时

• ±1%恒压充电精度

• ±10%恒流充电精度

• 低于10uA的电池反相供电电流

• 电池低电压涓流充电

• 自动电池重置充电

• 低功耗休眠模式

• 电池温度检测

• 提供SOP-8与TDFN-10封装

• 符合RoHS规范及Pb-Free

Wide Input Supply Voltage Range: 

4.8V to 20V – 4.2 Version 

8.9V to 20V – 8.4 Version 

8.9V to 20V – 8.4A Version
 

500kHz Switching Frequency

 
End-of-Charge Current Detection Output

 
7 Hour Charge Termination Timer

 
±1% Charge Voltage Accuracy

 
±10% Charge Current Accuracy

 
Low 10μA Reverse Battery Drain Current

 
Automatic Battery Recharge

 
Automatic Trickle Charging of Low Voltage Batteries

 
Automatic Sleep Mode for Low Power Consumption

 
Battery Temperature Sensing

 
Stable with Ceramic Output Capacitor

 
8-Lead SOP and 10-Lead TDFN Packages

 
RoHS Compliant and 100% Lead (Pb)-Free

   应用范围 返回TOP

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• • 小型笔记型计算机

• • 可携式DVD播放器

• • 掌上型设备

   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

 

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Standalone Linear Li-Ion Battery Charger With Thermal Regulation in ThinSOT
Part Number	remark	Packs	Vin (V)	Charge  Current (A)	Charge   Termination	Control   Topology	Temperature Monitoring
CXLB7386	XStandalone Linear   Li-Ion Battery Charger With Thermal Regulation in ThinSOT	1 Cells, Li-Ion	4.35   ~ 6.5	800mA	Minimum   current	Linear   W/FET	No
CXLB7387	Linear   Li-Ion/Polymer Charger IC with Integrated FET and Charger Timer	1 Cells, Li-Ion	4.35   ~ 6	1	Minimum   current & Safety timer	Linear   W/FET	Yes
CXLB7388	Dual Source AC/USB   Li-Ion/Polymer Charger IC for Portable Applications	1 Cells, Li-Ion	4.35   ~ 6 USB	1	Minimum   current & Safety timer	Linear   W/FET	Yes
CXLB7389	Li-ion/Li Polymer   Battery Charger	1 Cells, Li-Ion	4.3   ~ 6.5	2	Minimum   current & Safety timer	Linear   W/FET	Yes
CXLB7390	witch Mode   Li-Ion/Polymer Battery Charger	1/2 Cells, Li-Ion	4.7~20	1~3	Minimum   current & Safety timer	Switching	Yes
CXLB7391	Switch Mode   Li-Ion/Polymer Battery Charger	1/2 Cells, Li-Ion	4.7~20	1~3	Minimum   current & Safety timer	Switching	Yes
CXLB7392	Switch Mode   Li-Ion/Polymer Battery Charger	1 cells, Li-Ion	4.7~20	1~3	Minimum   current & Safety timer	Switching	Yes