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MCP73831T-2ACI/OT 参数 Datasheet PDF下载

MCP73831T-2ACI/OT图片预览
型号: MCP73831T-2ACI/OT
PDF下载: 下载PDF文件 查看货源
内容描述: 微型单细胞,完全集成的锂离子电池,锂聚合物充电管理控制器 [Miniature Single-Cell, Fully Integrated Li-Ion, Li-Polymer Charge Management Controllers]
分类和应用: 电池控制器
文件页数/大小: 24 页 / 679 K
品牌: MICROCHIP [ MICROCHIP ]
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MCP73831/2  
cells constant current followed by constant voltage.  
Figure 6-1 depicts a typical stand-alone application  
circuit, while Figures 6-2 and 6-3 depict the  
accompanying charge profile.  
6.0  
APPLICATIONS  
The MCP73831/2 are designed to operate in conjunc-  
tion with a host microcontroller or in a stand-alone  
application. The MCP73831/2 provide the preferred  
charge algorithm for Lithium-Ion and Lithium-Polymer  
Li-Ion Battery Charger  
4
3
5
2
VDD  
VBAT  
+
-
Single  
Li-Ion  
Cell  
CIN  
RLED  
LED  
COUT  
STAT PROG  
REGULATED  
WALL CUBE  
RPROG  
1
VSS  
MCP73831  
FIGURE 6-1:  
Typical Application Circuit.  
6.0  
5.0  
4.0  
3.0  
2.0  
120  
100  
80  
6.0  
5.0  
4.0  
3.0  
2.0  
1.0  
0.0  
600  
500  
400  
300  
200  
100  
0
60  
40  
MCP73831-2AC/IOT  
VDD = 5.2V  
RPROG = 10 kΩ  
MCP73831-2AC/IOT  
VDD = 5.2V  
RPROG = 2 kΩ  
1.0  
0.0  
20  
0
Time (minutes)  
Time (minutes)  
FIGURE 6-2:  
Typical Charge Profile  
FIGURE 6-3:  
Typical Charge Profile in  
(180 mAh Battery).  
Thermal Regulation (1000 mAh Battery).  
6.1  
Application Circuit Design  
Due to the low efficiency of linear charging, the most  
important factors are thermal design and cost, which  
are a direct function of the input voltage, output current  
and thermal impedance between the battery charger  
and the ambient cooling air. The worst-case situation  
is when the device has transitioned from the  
Preconditioning mode to the Constant-Current mode.  
In this situation, the battery charger has to dissipate  
the maximum power. A trade-off must be made  
between the charge current, cost and thermal  
requirements of the charger.  
6.1.1.1  
Current Programming Resistor  
(RPROG  
)
The preferred fast charge current for Lithium-Ion cells  
is at the 1C rate, with an absolute maximum current at  
the 2C rate. For example, a 500 mAh battery pack has  
a preferred fast charge current of 500 mA. Charging at  
this rate provides the shortest charge cycle times  
without degradation to the battery pack performance  
or life.  
6.1.1  
COMPONENT SELECTION  
Selection of the external components in Figure 6-1 is  
crucial to the integrity and reliability of the charging  
system. The following discussion is intended as a  
guide for the component selection process.  
© 2006 Microchip Technology Inc.  
DS21984B-page 13  
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