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参数资料
| 型号： | LTC4050EMS-4.2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRG CNTRL LI-ION 10MSOP |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.5 V ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
LTC4050
OPERATIO
The LTC4050 is a linear battery charger controller. The
charge current is programmed by the combination of a
program resistor (R PROG ) from the PROG pin to ground
and a sense resistor (R SENSE ) between the V CC and SENSE
pins. R PROG sets a program current through an internal
trimmed 800 ? resistor setting up a voltage drop from V CC
to the input of the current amplifier (CA). The current
amplifier servos the gate of the external P-channel MOSFET
to force the same voltage drop across R SENSE which sets
the charge current. When the voltage at the BAT pin
approaches the preset float voltage, the voltage amplifier
(VA) will start sinking current which reduces the voltage
drop across R SENSE , thus reducing the charge current.
A charge cycle begins when the voltage at V CC pin rises
above the UVLO level, a program resistor is connected
from the PROG pin to ground, and the NTC thermistor
temperature is between 0 ° C and 50 ° C. At the beginning of
the charge cycle, if the battery voltage is below 2.49V, the
charger goes into trickle charge mode. The trickle charge
current is 10% of the full-scale current. If the cell voltage
stays low for one quarter of the total charge time, the
charge sequence will terminate.
The charger goes into the fast charge constant-current
mode after the voltage on the BAT pin rises above 2.49V.
In constant-current mode, the charge current is set by the
combination of R SENSE and R PROG .
When the battery approaches the final float voltage, the
charge current will begin to decrease. When the current
drops to 10% of the full-scale charge current, an internal
at the CHRG pin and connect a weak current source to
ground, indicating that the battery is nearly fully charged
( C /10 occurs at approximately 94% charge).
An external capacitor on the TIMER pin sets the total
charge time. After a time-out occurs, the charge cycle is
terminated and the CHRG pin is forced high impedance. To
restart the charge cycle, remove the input voltage and
reapply it, or momentarily float the PROG pin.
Replacing the battery when charging will cause the timer
to be reset if the cell voltage of the new battery is below
3.88V (for 4.1V cells) or 3.98V (for 4.2V cells). If the
voltage is above 3.88V(for 4.1V cells) or 3.98V (for 4.2V
cells) the timer will continue for the remaining charge
time. In the case when a time out has occurred, a new
battery with a cell voltage of less than 3.88V or 3.98V can
be inserted and charged automatically with the full pro-
grammed charge time.
For batteries like lithium-ion that require accurate final
float voltage, the internal 2.47V reference, voltage ampli-
fier and the resistor divider provide regulation with ± 1%
(max) accuracy.
The charger can be shut down by floating the PROG pin.
An internal current source will pull it high and clamp at
3.5V.
When the input voltage is not present, the charger goes
into a sleep mode, dropping I CC to 5 μ A. This greatly
reduces the current drain on the battery and increases the
standby time.
comparator will turn off the pull-down N-channel MOSFET
4050f
7
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相关代理商/技术参数 |
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| LTC4052 | 制造商:LINER 制造商全称:Linear Technology 功能描述:150mA Standalone Linear Li-Ion Battery Charger in ThinSOT |
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| LTC4052EMS8E-4.2 | 功能描述:IC CHARGER PULSE LI-ION 8-MSOP RoHS:否 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 |
| LTC4052EMS8E-4.2#PBF | 功能描述:IC CHARGER PULSE LI-ION 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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