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MCP73862-I/ML 参数 Datasheet PDF下载

MCP73862-I/ML图片预览
型号: MCP73862-I/ML
PDF下载: 下载PDF文件 查看货源
内容描述: 先进的单或双电池,完全集成的锂离子/锂聚合物充电管理控制器 [Advanced Single or Dual Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers]
分类和应用: 电源电路电池电源管理电路控制器
文件页数/大小: 28 页 / 444 K
品牌: MICROCHIP [ MICROCHIP ]
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MCP73861/2/3/4  
4.0  
DEVICE OVERVIEW  
The MCP7386X family of devices are highly advanced  
linear charge management controllers. Refer to the  
functional block diagram. Figure 4-2 depicts the  
operational flow algorithm from charge initiation to  
completion and automatic recharge.  
MCP73862/4 regulate to 4.1V and 8.2V, respectively.  
With VSET tied to VDD  
, the MCP73861/3 and  
MCP73862/4 regulate to 4.2V and 8.4V, respectively.  
4.4  
Charge Cycle Completion and  
Automatic Re-Charge  
4.1  
Charge Qualification and  
Preconditioning  
The MCP7386X monitors the charging current during  
the Constant-voltage regulation mode. The charge  
cycle is considered complete when the charge current  
has diminished below approximately 8% of the  
regulation current (IREG), or the elapsed timer has  
expired.  
Upon insertion of a battery, or application of an external  
supply, the MCP7386X family of devices automatically  
performs a series of safety checks to qualify the  
charge. The input source voltage must be above the  
Undervoltage Lockout (UVLO) threshold, the enable  
pin must be above the logic-high level and the cell  
temperature must be within the upper and lower  
thresholds. The qualification parameters are  
continuously monitored. Deviation beyond the limits  
automatically suspends or terminates the charge cycle.  
The input voltage must deviate below the UVLO stop  
threshold for at least one clock period to be considered  
valid.  
The MCP7386X automatically begins a new charge  
cycle when the battery voltage falls below the recharge  
threshold (VRTH), assuming all the qualification  
parameters are met.  
4.5  
Thermal Regulation  
The MCP7386X family limits the charge current based  
on the die temperature. Thermal regulation optimizes  
the charge cycle time while maintaining device reliabil-  
ity. If thermal regulation is entered, the timer is automat-  
ically slowed down to ensure that a charge cycle will  
not terminate prematurely. Figure 4-1 depicts the  
thermal regulation profile.  
Once the qualification parameters have been met, the  
MCP7386X initiates a charge cycle. The charge status  
output is pulled low throughout the charge cycle (see  
Table 5-1 for charge status outputs). If the battery  
voltage is below the preconditioning threshold (VPTH),  
the MCP7386X preconditions the battery with a trickle-  
charge. The preconditioning current is set to approxi-  
mately 10% of the fast charge regulation current. The  
preconditioning trickle-charge safely replenishes  
deeply depleted cells and minimizes heat dissipation  
during the initial charge cycle. If the battery voltage has  
not exceeded the preconditioning threshold before the  
preconditioning timer has expired, a fault is indicated  
and the charge cycle is terminated.  
1400  
1200  
1000  
800  
Maximum  
Minimum  
600  
400  
200  
0
4.2  
Constant Current Regulation –  
Fast Charge  
0
20  
40  
60  
80  
100  
120  
140  
Die Temperature (° C)  
Preconditioning ends, and fast charging begins, when  
the battery voltage exceeds the preconditioning thresh-  
old. Fast charge regulates to a constant current (IREG),  
which is set via an external resistor connected to the  
PROG pin. Fast charge continues until the battery  
voltage reaches the regulation voltage (VREG), or the  
fast charge timer expires; in which case, a fault is  
indicated and the charge cycle is terminated.  
FIGURE 4-1:  
Current vs. Die Temperature.  
Typical Maximum Charge  
4.6  
Thermal Shutdown  
The MCP7386X family suspends charge if the die  
temperature exceeds 155°C. Charging will resume  
when the die temperature has cooled by approximately  
10°C. The thermal shutdown is a secondary safety  
feature in the event that there is a failure within the  
thermal regulation circuitry.  
4.3  
Constant Voltage Regulation  
When the battery voltage reaches the regulation  
voltage (VREG), constant voltage regulation begins.  
The MCP7386X monitors the battery voltage at the  
VBAT pin. This input is tied directly to the positive  
terminal of the battery. The MCP7386X selects the  
voltage regulation value based on the state of VSET  
.
With VSET tied to VSS the MCP73861/3 and  
,
© 2005 Microchip Technology Inc.  
DS21893C-page 13