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參數(shù)資料
| 型號： | MCP73861 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Advanced Single Cell, Fully Integrated Li-Ion /Li-Polymer Charge Management Controllers(增強(qiáng)型單節(jié)高度集成的鋰離子/鋰聚合物充電管理控制器) |
| 中文描述： | 先進(jìn)的單細(xì)胞，完全集成的鋰離子/鋰聚合物充電管理控制器（增強(qiáng)型單節(jié)高度集成的鋰離子/鋰聚合物充電管理控制器） |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 402K |
| 代理商： | MCP73861 |
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MCP73861/2
DS21893A-page 18
2004 Microchip Technology Inc.
FIGURE 6-3:
Typical Charge Profile in Thermal Regulation.
6.1
Application Circuit Design
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 the precondi-
tioning phase to the constant current phase. In this
situation, the battery charger has to dissipate the
maximum power. A trade-off must be made between
the charge current, cost and thermal requirements of
the charger.
6.1.1
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.
COMPONENT SELECTION
6.1.1.1
Current Programming Resistor
(R
PROG
)
The preferred fast charge current for Lithium-Ion cells
is at the 1C rate, with an absolute maximum current at
the 2C rate. For example, a 500 mAh battery pack has
a preferred fast charge current of 500 mA. Charging at
this rate provides the shortest charge cycle times with-
out degradation to the battery pack performance or life.
1200 mA is the maximum charge current obtainable
from the MCP7386X. For this situation, the PROG input
should be connected directly to V
SS
.
6.1.1.2
Thermal Considerations
The worst-case power dissipation in the battery
charger occurs when the input voltage is at the
maximum and the device has transitioned from the
preconditioning phase to the constant current phase. In
this case, the power dissipation is:
Regulation
Voltage
(V
REG
)
Regulation
Current
(I
REG
)
Transition
Threshold
(V
PTH
)
Precondition
Safety Timer
Fast Charge
Safety Timer
Elapsed Time
Termination Timer
Charge
Voltage
Preconditioning
Mode
Constant Current
Mode
Constant Voltage
Mode
Charge
Current
Precondition
Current
(I
PREG
)
Termination
Current
(I
TERM
)
PowerDissipation
VDDMAX
VPTHMIN
–
(
)
IREGMAX
×
=
Where:
V
DDMAX
is the maximum input voltage
I
REGMAX
is the maximum fast charge current
V
PTHMIN
is the minimum transition threshold
voltage.
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參數(shù)描述 |
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| MCP73861_05 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Advanced Single or Dual Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers |
| MCP73861_08 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Advanced Single or Dual Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers |
| MCP73861_11 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Advanced Single or Dual Cell, Fully Integrated Li-Ion/Li-Polymer Charge Management |
| MCP73861_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Advanced Single or Dual Cell, Fully Integrated Li-Ion/Li-Polymer Charge Management Controllers |
| MCP73861-I/ML | 功能描述:電池管理 Sgl High Integrated RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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