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参数资料
| 型号： | LTC4071IMS8E#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC LI-ION/POLY BATT CHRGR 8-MSOP |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 8-MSOP-EP |
| 包装： | 管件 |
LTC4071
APPLICATIONS INFORMATION
P DISS = ( V WALL ? V BAT _ MIN ) 2 = ( 12V ? 3.2V ) 2 = 0.48W
I SHUNT _ MAX = ( V WALL ? V FLOAT ) = ( 12V ? 4.1V ) = 49mA
GeneralChargingConsiderations
The LTC4071 uses a different charging methodology from
previous chargers. Most Li-Ion chargers terminate the
charging after a period of time. The LTC4071 does not have
a discrete charge termination. Extensive measurements
on Li-Ion cells show that the cell charge current drops
to very low levels with the shunt charge control circuit
effectively terminating the charge. For improved battery
lifetime choose 4.0V or 4.1V float voltage.
The battery disconnect function requires some care in se-
lecting the input supply compliance for charging a battery
while powering a load at V CC . The internal battery discon-
nect switch remains off while charging the battery through
the body diode of the internal switch until V CC exceeds
V LBC_VCC . If the source voltage compliance is not greater
than V LBC_VCC , then the battery will never re-connect to
V CC and the system load will not be able to run on battery
power. Users may detect that the battery is connected by
monitoring the NTCBIAS pin as it will periodically pulse
high once V CC has risen above V LBC_VCC , and stops pulsing
once V CC falls below V LBD .
The simplest application of the LTC4071 is shown in Fig-
ure 2. This application requires only an external resistor
to program the charge/shunt current. Assume the wall
R IN = 162?, 0.5W
WALL
ADAPTER V CC BAT
Care must be taken in selecting the input resistor. Power
dissipated in R IN under full charge current is given by the
following equation:
R IN 162 ?
The charge current decreases as the battery voltage
increases. If the battery voltage is 40mV less than the
programmed float voltage the LTC4071 consumes only
550nA of current, and all of the excess input current flows
into the battery. As the battery voltage reaches the float
voltage, the LTC4071 shunts current from the wall adapter
and regulates the battery voltage to V FLOAT = V CC . The
more shunt current the LTC4071 sinks, the less charge
current the battery gets. Eventually, the LTC4071 shunts
all the current flowing through R IN ; up to the maximum
shunt current. The maximum shunt current in this case,
with no NTC adjustment is determined by the input resistor
and is calculated as:
R IN 162 ?
At this point the power dissipated in the input resistor is
388mW.
The LTC4071 can also be used to regulate series-connected
battery stacks as illustrated in Figure 3. Here two LTC4071
devices are used to charge two batteries in series. A
single resistor sets the maximum charge/shunt current.
1μF
LTC4071
GND
+ Li-Ion
BATTERY
WALL
ADAPTER
R IN
V CC
BAT
LTC4071
4071 F02
Figure 2. Single-Cell Battery Charger
1μF
GND
+ Li-Ion
BATTERY
( V WALL ? V BAT _ MIN )
I MAX _ CHARGE =
( 12V ? 3.2V )
162 ?
+ Li-Ion
adaptervoltage(V WALL )is12Vandthemaximumcharge
current is calculated as:
R IN
= = 54mA
V CC BAT
LTC4071
1μF
GND
Figure 3. 2-Cell Battery Charger
BATTERY
4071 F03
4071fc
10
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| LTC4075EDD#TRPBF | 功能描述:IC CHARG BATT LI-ON USB 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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