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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  
5.2  
Digital Circuitry  
5.0  
DETAILED DESCRIPTION  
5.2.1  
STATUS INDICATOR (STAT)  
5.1  
Analog Circuitry  
The charge status output of the MCP73831 has three  
different states: High (H), Low (L), and High-Imped-  
ance (Hi-Z). The charge status output of the  
MCP73832 is open-drain, and, as such, has two differ-  
ent states: Low (L), and High-Impedance (Hi-Z). The  
charge charge status output can be used to illuminate  
1, 2, or tri-color LEDs. Optionally, the charge status  
output can be used as an interface to a host  
microcontroller.  
5.1.1  
BATTERY MANAGEMENT INPUT  
SUPPLY (VDD  
)
The VDD input is the input supply to the MCP73831/2.  
The MCP73831/2 automatically enter a Power-Down  
mode if the voltage on the VDD input falls below the  
UVLO voltage (VSTOP). This feature prevents draining  
the battery pack when the VDD supply is not present.  
5.1.2  
CURRENT REGULATION SET  
(PROG)  
Table 5-1 summarize the state of the status output  
during a charge cycle..  
Fast charge current regulation can be scaled by plac-  
ing a programming resistor (RPROG) from the PROG  
input to VSS. The program resistor and the charge  
current are calculated using the following equation:  
TABLE 5-1:  
STATUS OUTPUT  
STAT1  
MCP73831 MCP73832  
Charge Cycle State  
Shutdown  
Hi-Z  
Hi-Z  
L
Hi-Z  
Hi-Z  
L
1000V  
RPROG  
----------------  
=
IREG  
No Battery Present  
Preconditioning  
Where:  
Constant-Current Fast  
Charge  
L
L
RPROG  
IREG  
=
=
kOhms  
milliampere  
Constant Voltage  
L
L
Charge Complete –  
Standby  
H
Hi-Z  
The preconditioning trickle charge current and the  
charge termination current are ratiometric to the fast  
charge current based on the selected device options.  
5.2.2  
DEVICE DISABLE (PROG)  
The current regulation set input pin (PROG) can be  
used to terminate a charge at any time during the  
charge cycle, as well as to initiate a charge cycle or  
initiate a recharge cycle.  
5.1.3  
BATTERY CHARGE CONTROL  
OUTPUT (VBAT  
)
The battery charge control output is the drain terminal  
of an internal P-channel MOSFET. The MCP73831/2  
provide constant current and voltage regulation to the  
battery pack by controlling this MOSFET in the linear  
region. The battery charge control output should be  
connected to the positive terminal of the battery pack.  
Placing a programming resistor from the PROG input  
to VSS enables the device. Allowing the PROG input to  
float or by applying a logic-high input signal, disables  
the device and terminates a charge cycle. When  
disabled, the device’s supply current is reduced to  
25 μA, typically.  
DS21984B-page 12  
© 2006 Microchip Technology Inc.  
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