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參數(shù)資料
| 型號： | MIC79110 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Simple 1.2A Linear Li-Ion Battery Charger |
| 中文描述： | 簡單1.2A的線性鋰離子電池充電器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 156K |
| 代理商： | MIC79110 |
MIC79110
Application Information
Detailed Description
The MIC79110 forms a complete charger for 1-cell Lithium-
ion batteries. It includes precision voltage control (0.75%
over temperature) to optimize both cell performance and
cycle life. All are compatible with common 4.2V Lithium-ion
chemistries. Voltages other than 4.2V can be obtained with
the adjustable version. Other features include current limit,
end-of-charge flag and end-of-charge current limit using an
external resistor. The shutdown pin enables low quiescent
current when not charging.
Current Limit Mode
MIC79110 features an internal current limit that is set by the
Rset pin with a resistor-to-ground. The maximum current is
calculated by the following equation:
IR
set
= (0.2/R
set
)
×
1000
Using a 167
R
set
resistor will achieve the maximum current
limit for the MIC79110 at 1.2 amperes.
End of Charge
REOC pin is connected to a resistor-to-ground. This resistor
is used to set the end of charge current for the lithium ion
battery as follows:
IR
EOC
= (0.2/R
EOC
)
×
1000
Using a 4k
R
EOC
resistor will set the end-of-charge
current at 50mA.
IReoc should be set at 10% of the battery’s rated current.
Digital End-of Charge Output
This pin is the output of an open drain. When tied high to the
supply using a resistor, the output will toggle high or low
depending on the output current of Ibat.
- Low state indicates that the Ibat current is higher
than the programmed current set by REOC.
- High state indicates that the Ibat current is lower
than the programmed current set by REOC. The
output goes high impedance indicating end-of-
charge.
Analog-End-Of-Charge Output
The ACHG pin provides a small current that is proportional to
the charge current. The ratio is set at 1/1000
th
of the output
current.
Shutdown
The SD pin serves as a logic input (active low) to enable the
charger.
Built-in hysteresis for the shutdown pin is 50mV over tem-
perature.
Reverse Polarity Protection
In the event that V
BAT
> V
IN
and the shutdown pin is active
low, there is reverse battery current protection built in. The
current is limited to less than 10
μ
A over temperature.
Micrel
M9999-072004
8
July 2004
Constant Output Voltage/Current Charging
The MIC79110 features constant voltage and constant cur-
rent output to correctly charge lithium-ion batteries. The
constant voltage is either 4.2V or adjustable. The constant
current is set by the Rset pin and is constant down to around
300mV. Since Rset can be set below 500mA, the minimum
output current is set at 500mA for output voltages below
100mV. This minimum voltage starts the charging process in
lithium-ion batteries. If the output current is too low, the
battery will not begin charge.
I Current
I Current
500mA
0.7V
I
MAX
= (0.2/R
SET
)
×
1000
Standard V-I Curve
MIC79110 V-I Curve
S
M
Lithium Ion Batteries
Lithium-ion batteries are charged in two stages to reach full
capacity. The first stage charges the battery with maximum
charge current until 90% of the battery cell’s voltage limit is
reached. The second stage tops off the charge with constant
voltage charge as the charge current slowly decreases. End
of charge is reached when the current is less than 3% of the
rated current. A third stage will occasionally top off with
charge with constant voltage charge if the battery voltage
drops below a certain threshold.
1.25/5
Charge Current
Voltage/Cell
1.00/4
0.75/3
0.50/2
0.25/1
1
2
TIME (hrs)
is applied until the
cell reached
as full charge is approached
topabout 1 per
500h
C
3
curated current
....
....
All lithium-ion batteries take approximately 3 hours to charge
with the second stage taking twice as long as the first stage.
Some chargers claim to be fast chargers by skipping the
second stage and just charges the battery until the cell
voltage is reached. This only charges the battery to 70%
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| MIC79110BML | Simple 1.2A Linear Li-Ion Battery Charger |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MIC79110_07 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Simple 1.2A Linear Li-Ion Battery Charger |
| MIC79110-4.2BML | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Simple 1.2A Linear Li-Ion Battery Charger |
| MIC79110-4.2BML TR | 功能描述:IC BATTERY CHARGER LI-ION 10-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:1 系列:- 功能:充電管理 電池化學:鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| MIC79110-4.2YML TR | 功能描述:電池管理 1.2A Li-Ion Linear Battery Charger(Lead Free) 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 |
| MIC79110-4.2YML-TR | 功能描述:IC BATTERY CHARGER LI-ION 10-MLF 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 電池化學:鋰離子 電池數(shù):1 Current Charging:- 可編程特性:- 故障保護:過流，超溫，反向電流 充電電流 - 最大值:1.2A Battery Pack Voltage:4.2V 電壓 -?供電（最高）:16V 接口:- 工作溫度:-40°C ~ 125°C （TJ） 封裝/外殼:10-VFDFN 裸露焊盤，10-MLF? 供應商器件封裝:10-MLF?（3x3） 標準包裝:1 |
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