欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第6页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第7页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第8页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第9页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第11页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第12页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第13页浏览型号MCP73831T-2ACI/OT的Datasheet PDF文件第14页  
MCP73831/2  
4.0  
DEVICE OVERVIEW  
The MCP73831/2 are highly advanced linear charge  
management controllers. Figure 4-1 depicts the  
operational flow algorithm from charge initiation to  
completion and automatic recharge.  
The UVLO circuit places the device in Shutdown mode  
if the input supply falls to within +50 mV of the battery  
voltage. Again, the input supply must rise to a level  
150 mV above the battery voltage before the  
MCP73831/2 become operational.  
The UVLO circuit is always active. At any time the  
input supply is below the UVLO threshold or within  
+50 mV of the voltage at the VBAT pin, the  
MCP73831/2 are placed in a Shutdown mode.  
SHUTDOWN MODE  
V
< V  
DD  
UVLO  
V
< V  
or  
DD  
BAT  
PROG > 200 kΩ  
STAT = Hi-Z  
During any UVLO condition, the battery reverse  
discharge current shall be less than 2 μA.  
V
< V  
PTH  
BAT  
4.2  
Charge Qualification  
PRECONDITIONING  
MODE  
For a charge cycle to begin, all UVLO conditions must  
be met and a battery or output load must be present. A  
charge current programming resistor must be  
connected from PROG to VSS. If the PROG pin is  
open or floating, the MCP73831/2 are disabled and  
the battery reverse discharge current is less than 2 μA.  
In this manner, the PROG pin acts as a charge enable  
and can be used as a manual shutdown.  
Charge Current = I  
PREG  
STAT = LOW  
V
> V  
PTH  
BAT  
V
> V  
< V  
BAT  
PTH  
RTH  
FAST CHARGE  
MODE  
V
Charge Current = I  
BAT  
REG  
STAT = LOW  
4.3  
Preconditioning  
If the voltage at the VBAT pin is less than the precondi-  
tioning threshold, the MCP73831/2 enter a precondi-  
tioning or Trickle Charge mode. The preconditioning  
threshold is factory set. Refer to Section 1.0 “Electri-  
cal Characteristics” for preconditioning threshold  
options and the Product Identification System for  
standard options.  
V
= V  
REG  
BAT  
CONSTANT VOLTAGE  
MODE  
Charge Voltage = V  
REG  
STAT = LOW  
I
< I  
TERM  
In this mode, the MCP73831/2 supply a percentage of  
the charge current (established with the value of the  
resistor connected to the PROG pin) to the battery.  
The percentage or ratio of the current is factory set.  
Refer to Section 1.0 “Electrical Characteristics” for  
preconditioning current options and the Product  
Identification System for standard options.  
BAT  
CHARGE COMPLETE  
MODE  
No Charge Current  
STAT = HIGH (MCP73831)  
STAT = Hi-Z (MCP73832)  
When the voltage at the VBAT pin rises above the  
preconditioning threshold, the MCP73831/2 enter the  
Constant-Current or Fast Charge mode.  
FIGURE 4-1:  
Flowchart.  
4.1 Under Voltage Lockout (UVLO)  
4.4  
Fast Charge Constant-Current  
Mode  
An internal UVLO circuit monitors the input voltage  
and keeps the charger in Shutdown mode until the  
input supply rises above the UVLO threshold. The  
UVLO circuitry has a built in hysteresis of 100 mV.  
During the Constant-Current mode, the programmed  
charge current is supplied to the battery or load. The  
charge current is established using a single resistor  
from PROG to VSS  
maintained until the voltage at the VBAT pin reaches  
the regulation voltage, VREG  
In the event a battery is present when the input power  
is applied, the input supply must rise 150 mV above  
the battery voltage before the MCP73831/2 becomes  
operational.  
. Constant-Current mode is  
.
DS21984B-page 10  
© 2006 Microchip Technology Inc.  
 复制成功!