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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  
4.5  
Constant-Voltage Mode  
4.8  
Thermal Regulation  
When the voltage at the VBAT pin reaches the regula-  
tion voltage, VREG, constant voltage regulation begins.  
The regulation voltage is factory set to 4.2V, 4.35V,  
4.40V, or 4.50V with a tolerance of 0.75%.  
The MCP73831/2 limit the charge current based on  
the die temperature. The thermal regulation optimizes  
the charge cycle time while maintaining device  
reliability. Figure 4-2 depicts the thermal regulation for  
the MCP73831/2.  
4.6  
Charge Termination  
525  
The charge cycle is terminated when, during Constant-  
Voltage mode, the average charge current diminishes  
below a percentage of the programmed charge current  
(established with the value of the resistor connected to  
the PROG pin). A 1 ms filter time on the termination  
comparator ensures that transient load conditions do  
not result in premature charge cycle termination. The  
percentage or ratio of the current is factory set. Refer  
to Section 1.0 “Electrical Characteristics” for  
charge termination current options and the “Product  
Identification System” for standard options.  
Ω
RPROG = 2 k  
450  
375  
300  
225  
150  
75  
0
Junction Temperature (°C)  
The charge current is latched off and the MCP73831/2  
enter a Charge Complete mode.  
FIGURE 4-2:  
Thermal Regulation.  
4.7  
Automatic Recharge  
4.9  
Thermal Shutdown  
The MCP73831/2 continuously monitor the voltage at  
the VBAT pin in the Charge Complete mode. If the volt-  
age drops below the recharge threshold, another  
charge cycle begins and current is once again  
supplied to the battery or load. The recharge threshold  
is factory set. Refer to Section 1.0 “Electrical Char-  
acteristics” for recharge threshold options and the  
Product Identification System for standard options.  
The MCP73831/2 suspend charge if the die tempera-  
ture exceeds 150°C. Charging will resume when the  
die temperature has cooled by approximately 10°C.  
© 2006 Microchip Technology Inc.  
DS21984B-page 11  
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