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参数资料
| 型号： | MCP73838-CNI/MF |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 3 MM, 0.90 MM HEIGHT, PLASTIC, DFN-10 |
| 文件页数： | 13/30页 |
| 文件大小： | 816K |
| 代理商： | MCP73838-CNI/MF |
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MCP73837/8
DS22071A-page 20
2007 Microchip Technology Inc.
6.0
APPLICATIONS
The MCP73837/8 devices are designed to operate in
conjunction with a host microcontroller or in stand-
alone applications. The MCP73837/8 devices provide
the preferred charge algorithm for Lithium-Ion and
Lithium-Polymer cells Constant-current followed by
Constant-voltage. Figure 6-1 depicts a typical stand-
alone MCP73837 application circuit, while Figure 6-2
and Figure 6-3 depict the accompanying charge
profile.
FIGURE 6-1:
MCP73837 Typical Stand-Alone Application Circuit.
FIGURE 6-2:
Typical Charge Profile
(1200 mAh Li-Ion Battery).
FIGURE 6-3:
Typical Charge Profile in
Thermal Regulation (1200 mAh Li-Ion Battery).
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
Preconditioning mode to the Constant Current mode. 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
COMPONENT SELECTION
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.
6.1.1.1
Charge Current
The preferred fast charge current for Lithium-Ion cells
should always follow references and guidance from
battery manufacturers. For example, programming
700 mA fast charge current for a 1000 mAh Li-Ion
battery pack if its preferred fast charge rate is 0.7C.
This will result the shortest charge cycle time without
degradation a battery's life and performance.
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 mode to the Constant-current mode. In
this case, the power dissipation is:
STAT1
V
AC
V
SS
/PG
V
BAT
Single
Li-Ion
Cell
4
MCP73837
5
3
1
2
STAT2
THERM
V
USB
PROG1
PROG2
USB Port
6
7
Hi
Low
Thermsitor
R
PROG
8
9
10
1
ΚΩ
1
ΚΩ
1
ΚΩ
REGULATED
WALL CUBE
C
IN1
C
IN2
C
OUT
0.0
1.0
2.0
3.0
4.0
5.0
0
10
20
30
40
50
60
70
80
90
10
0
11
0
12
0
13
0
14
0
15
0
Time (Minutes)
Ba
tt
ery
Volt
age
(V
)
0
0.2
0.4
0.6
0.8
1
1.2
Charge
Current
(A)
VDD = 5.2V
RPROG = 1 k
1200 mAh Li-Ion Battery
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0123456789
10
Time (Minutes)
Ba
tt
e
ry
Vo
lt
ag
e(V
)
0
0.3
0.6
0.9
1.2
Charge
C
u
rrent
(
A
)
VDD = 5.2V
RPROG = 1 k
1200 mAh Li-Ion Battery
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP73838CNIUN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Management Controller with Autonomous AC-Adapter or USB-Port Source Selection |
| MCP73838-FCI/MF | 功能描述:电池管理 1A USB/DC Auto Swtch Li-Ion Chrgr TE Otpt RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MCP73838-FCI/UN | 功能描述:电池管理 1A USB/DC input auto-swich RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MCP73838-FCI/UN | 制造商:Microchip Technology Inc 功能描述:IC BATT CHRG LI-ION/LI-POLYMER 1A MS |
| MCP73838FCIMF | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Advanced Stand-Alone Li-Ion / Li-Polymer Battery Charge Management Controller with Autonomous AC-Adapter or USB-Port Source Selection |
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