可编程充电电流800毫安CXLB73121软启动限制励磁涌流2.9V涓流充电阈值USB端口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自动终止充电循环

CXLB73121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。它的SOT-23封装和低外部组件数量使CXLB73121非常适合便携式应用。此外，CXLB73121专门设计为在USB电源规范内工作。同时，CXLB73121还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4.2V，充电电流可通过一个电阻器进行外部编程。当达到最终浮充电压后，充电电流降至编程值的1/10时，CXLB73121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，CXLB73121自动进入低电流阶段，将电池放电电流降至小于2uA。CXLB73121可以进入停机模式，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的状态引脚以及输入电压的存在。CXLB73121被故意设计成有轻微的负温度。这为锂电池充电提供了额外的保护。

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

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     CXLB73121 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 make CXLB73121 ideally suited for portable applications.  Furthermore, the CXLB73121 is specifically designed to work within USB power specification.  At the same time, CXLB73121 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 4.2V, and the charge current can be programmed externally with a single resistor.  The CXLB73121 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 CXLB73121 automatically enters a low current stage, dropping the battery drain current to less than 2uA.  The CXLB73121 can 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. CXLB73121 is intentionally designed to have slightly negative Tempco. This provides extra protection to Lithium battery during charging.

   产品特点 返回TOP

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Ø Programmable Charge Current Up to 800mA. 

Ø No MOSFET, Sense Resistor or Blocking Diode Required. 

Ø Constant-Current/Constant-Voltage Operation with Thermal Protection to Maximize Charge Rate without Risk of Overheating. 

Ø Charges Single Cell Li-Ion Batteries Directly from USB Port. 

Ø Preset 4.2V Charge Voltage with ±1% Accuracy. 

Ø 20uA Supply Current in Shutdown. 

Ø 2.9V Trickle Charge Threshold 

Ø Soft-Start Limits Inrush Current. 

Ø Available in PSOP-8 (Exposed Pad) Packages. 

Ø RoHS Compliant and 100% Lead (Pb)-Free

   应用范围 返回TOP

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Ø Electronic cigarette 

   技术规格书（产品PDF) 返回TOP 

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     需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

 

产品封装图 返回TOP

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电路原理图 返回TOP

 

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Battery Charger（锂电池充电）
Product	status	VccMax	Vbat	IOUT Max	Polarity Detect	OTP、OCP	Pkg
CXLB73120	Active	8V	4.35	1A	NO	Yes	SOT23-5 PSOP8
CXLB73121	Active	8V	4.22	1A	NO	Yes	SOP8 PSOP8（电子烟）
CXLB73122	Active	8V	4.22	800mA	NO(单灯)	Yes	SOT23-5
CXLB73123	Active	8V	4.22	800mA	NO(双灯）	Yes	SOT23-6 PSOP8
CXLB73124	Active	8V	4.22	1A	NO	Yes	PSOP8/DFN2*2-6
CXLB73125	Active	8V	4.22/4.35	2.5A	YES(单灯）	Yes	PSOP8
CXLB73126	Active	8V	4.22/4.35	2.5A	YES(双灯）	Yes	PSOP8