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| 型号： | ADM00313 |
| 厂商： | Microchip Technology |
| 文件页数： | 17/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL LI-ION CHRG MCP73830L |
| 设计资源： | MCP73830L Eval Bd Gerber |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电池充电器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MCP73830L |
| 主要属性： | 1 芯锂离子电池 |
| 次要属性： | LED 状态指示器 |
| 已供物品： | 板 |
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MCP73830/L
6.0
APPLICATIONS
algorithm for dual Lithium-Ion or Lithium-Polymer cell’s
constant current, followed by constant voltage.
The MCP73830 is designed to operate in conjunction
with a host microcontroller or in stand-alone applica-
tions. The MCP73830/L provides the preferred charge
circuit, while Figure 6-2 depicts the accompanying
charge profile.
4
V DD
V BAT
3
+
4.7μF
4.7 μF
Regulated
wall cube
1 k ?
2
STAT
PROG
6
2 k ?
-
1-Cell
Li-Ion
Battery
L o Hi
5
CE
V SS
1
MCP73830/L
FIGURE 6-1:
Typical Application Circuit.
6.1.1.1
Charge Current
The preferred fast charge current for Li-Ion/Li-Poly cells
is below the 1C rate, with an absolute maximum current
at the 2C rate. The recommended fast charge
current should be obtained from the battery
manufacturer. For example, a 500 mAh battery pack
with 0.7C preferred fast charge current has a charge
current of 350 mA. Charging at this rate provides the
shortest charge cycle times without degradation to the
battery pack performance or life.
Note:
Please consult with your battery supplier,
or refer to the battery data sheet, for the
FIGURE 6-2:
(Li-Ion Battery).
Typical Charge Profile
6.1.1.2
preferred charge rate.
Thermal Considerations
6.1
Application Circuit Design
The worst-case power dissipation in the battery char-
ger occurs when the input voltage is at the maximum
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 Preconditioning
mode to Constant Current mode. In this situation, the
battery charger has to dissipate the maximum power. A
and the device has transitioned from Preconditioning
mode to constant current mode. In this case, the power
dissipation is:
EQUATION 6-1:
PowerDissipation = ? V DDMAX – V PTHMIN ? ? I REGMAX
Where:
trade-off must be made between the charge current,
cost and thermal requirements of the charger.
V DDMAX
=
the maximum input voltage
6.1.1
COMPONENT SELECTION
I REGMAX
V PTHMIN
=
=
the maximum fast charge current
the minimum transition threshold
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.
? 2011 Microchip Technology Inc.
voltage
DS25049B-page 17
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