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| 型号： | MIC79110YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER BATT LI-ON ADJ 10MLF |
| 标准包装： | 1 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.5 V ~ 16 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1081 (CN2011-ZH PDF) |
| 其它名称： | 576-1320-6 |
Micrel, Inc.
Lithium-ion Batteries
Lithium-ion batteries are charged in two stages to reach
full capacity. The ?rst stage charges the bat tery 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.
MIC79110
The specifications of these safety circuits are dictated by
the cell manufacturer and may include the following:
? Reverse polarity protection.
? Charge temperature must not be charged when
temperature is lower than 0°C or above 45°C.
? Charge current must not be too high, typically below
0.7°C.
? Discharge current protection to prevent damage due to
short circuits.
? Protection circuitry for over voltage applied to the
battery terminals.
? Overcharge protection circuitry to stop charge when
the voltage per cell rises above 4.3V.
? Over discharge protection circuitry to stop discharge
when the battery voltage falls below 2.3V (varies with
manufacturer).
? Thermal shutdown protection for the battery if the
ambient temperature is above 100°C.
Auto Top-Off Charger Application Circuit
Figure 2. Typical Two-Stage Lithium Charge Profile
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% capacity.
An increase in the charge current during stage 1 does not
shorten the total charge time. It will only shorten the time
for stage 1 to complete and lengthen the time in stage 2.
The lithium-ion loses charge due to aging whether it is
used or not. Do not store the batteries at full charge and
high heat because it will accelerate the aging process.
Try and store with 40% charge and in a cool
environment.
Lithium-ion Safety Precautions
Every lithium-ion battery pack should have a safety circuit
which monitors the charge and discharge of the pack and
prevents dangerous occurrences.
Figure 3. Auto Top-Off Charger ? Application Circuit
Lithium-ion batteries will begin to lose their charge over
time. The MIC79110 can be configured to automatically
recharge the battery when the voltage drops below the
minimum battery voltage. This minimum voltage is set by
a resistor divider at the battery and is connected to the
SD pin. For instance, if V BAT is 4.2V and the battery
voltage falls to 3.72V, SD pin gets divided down by R1
and R2 to 0.93V and starts the normal charging process.
While charging the DEOC indictor is turned on, pulling
the SD pin to GND, keeping the MIC79110 on. When the
end of charge is reached, the DEOC pin opens. The
divided down BAT voltage is now 1.05V at the SD pin,
ending the charging process.
May 21, 2013
12
052113-2.0 (while in progress)
Revision 2.0 (final document)
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