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| 型号： | MIC79110YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/15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.
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 ?ag ,
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 Equation 1:
MIC79110
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
temperature.
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 10μA over temperature.
Constant Output Voltage/Current Charging
The MIC79110 features constant voltage and constant
current output to correctly charge lithium-ion batteries.
The constant voltage is either 4.2V or adjustable. The
constant current is set by the R SET pin and is constant
down to around 300mV. Since R SET can be set below
I RSET = (0.2/R SET ) × 1000
Eq. 1
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
Using a 167Ω RSET 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 in Equation 2:
output current is too low, the battery will not begin
charge.
I EOC = (0.2/R EOC ) × 1000
Eq. 2
Using a 4kΩ R EOC resistor will set the end-of-charge
current at 50mA.
I EOC 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 I BAT .
? Low state indicates that the I BAT current is higher than
the programmed current set by R EOC .
? High state indicates that the I BAT current is lower than
the programmed current set by R EOC . 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
1/1000th of the output current.
Figure 1. MIC79110 Constant Output Voltage
May 21, 2013
11
052113-2.0 (while in progress)
Revision 2.0 (final document)
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