【经验】微源半导体恒流/恒压线性充电器LP4056H应用设计经验

时间： 2023-05-20 来源：世强

技术问答

LP4056H是一款完整的恒流/恒压线性充电器，适用于单节锂离子电池充电。LP4056H专为USB电源规格设计，输入电压范围4.5V至6.5V，充电电压为4.2V（精度1%），充电电流可通过电阻编程设定，最大充电电流可达1A。当达到浮充电压，充电电流降至程序设定值的1C/10时，LP4056H自动终止充电周期。封装为ESOP8，低外部元件数量使LP4056H非常适合便携式应用，如下为其典型应用电路图：

应用设计说明：

1、第2脚ISET为充电电流设置监控引脚。推荐使用1%精度的电阻来设置，电池充电电流是ISET引脚输出电流的1000倍，可由这个公式来计算：IBAT=1000V/RISET。

2、第6、7脚STAT2、STAT1为开漏输出的充电状态指示引脚，它们之间呈互补关系。当充电时STAT2为高、STAT1为低；当充电周期完成，STAT2为低、STAT1为高。使用LED指示灯和2K的电阻连接到电源输入。

3、充电电流比较大时，需做好芯片的散热措施，芯片的功耗基本是由内部MOSFET产生的，可以参照如下公式估算芯片的功耗和环境温度。其中，PD为耗散功率，VIN为输入电源电压，VBAT为电池电压，IBAT为充电电流：

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