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参数资料
| 型号： | LTC1732EMS-8.4#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC BATTCHRG CNTRLR LI-ION 10MSOP |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子，镍镉，镍氢 |
| 电源电压： | 4.5 V ~ 12 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： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
LTC1732-8.4
APPLICATIO N S I N FOR M ATIO N
Charger Conditions
The charger is off when any of the following conditions exist:
the V CC pin is less than 8.2V, the dropout voltage (V CC –
V BAT ) is less than 54mV, or the PROG pin is floating. The
DRV pin will be pulled to V CC and the internal resistor di-
vider is disconnected to reduce the current drain on the
battery.
Undervoltage Lockout (UVLO)
An internal undervoltage lockout circuit monitors the
input voltage and keeps the charger in shutdown mode
until V CC rises above 8.2V. To prevent oscillation around
V CC = 8.2V, the UVLO circuit has built-in hysteresis.
Trickle Charge and Defective Battery Detection
At the beginning of the charging sequence, if the battery
voltage is below 4.9V, the charger goes into trickle mode.
The charge current drops to 10% of the full-scale current.
If the low voltage persists for one quarter of the total
charge time, the battery is considered defective, the charge
cycle is terminated and the CHRG pin output is forced to
a high impedance state.
Shutdown
The LTC1732-8.4 can be forced into shutdown by floating
the PROG pin and allowing the internal 2.5 μ A current
source to pull the pin above the 2.457V shutdown thresh-
old voltage. The DRV pin is pulled up to V CC turning off the
external P-channel MOSFET. The internal timer is reset in
the shutdown mode.
Programming Charge Current
The formula for the battery charge current (see Block
Diagram) is:
I BAT = (I PROG )(800 ? /R SENSE )
= (2.457V/R PROG )(800 ? /R SENSE ) or
R PROG = (2.457V/I BAT )(800 ? /R SENSE )
For example, if 0.5A charge current is needed, select a
value for R SENSE that will drop 100mV at the maximum
charge current. R SENSE = 0.1V/0.5A = 0.2 ? , then calculate:
R PROG = (2.457V/500mA)(800 ? /0.2 ? ) = 19.656k
For best stability over temperature and time, 1% resistors
are recommended. The closest 1% resistor value is 19.6k.
Programming the Timer
The programmable timer terminates the charge cycle.
Typically, when charging at a 1C rate, a discharged Li-Ion
battery will become fully charged in 3 hours. For lower
charge current rates, extend the timer accordingly.The
length of the timer is programmed by an external capaci-
tor at the TIMER pin. The total charge time is:
Time (Hours) = (3 Hours) ? (C TIMER /0.1 μ F) or
C TIMER = 0.1 μ F ? Time (Hours)/3 (Hours)
The timer starts when an input voltage greater than 8.2V
is applied and the program resistor is connected to ground.
After a time-out occurs, the CHRG output will go into a
high impedance state to indicate that charging has stopped.
Connecting the TIMER pin to V CC disables the timer and
also puts the charger into a constant-current mode. To
only disable the timer function, short the TIMER pin to
GND.
CHRG Status Output Pin
When a charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET that can drive an
LED. When the battery current drops to 10% of the full-
scale current ( C /10), the N-channel MOSFET is turned off
and a weak 35 μ A current source to ground is connected to
the CHRG pin. After a time-out occurs, the pin will go into
a high impedance state. By using two different value pull-
up resistors, a microprocessor can detect three states
from this pin (charging, C /10 and stop charging). See
Figure 1 and Table 1.
where R PROG is the total resistance from the PROG pin to
ground.
17328f
8
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| LTC1733EMSE#PBF | 功能描述:IC CHRGR BATT MONO THERML 10MSOP 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 |
| LTC1733EMSE#PBF | 制造商:Linear Technology 功能描述:Battery Management IC |
| LTC1733EMSE#TR | 功能描述:IC CTRLR BATT CHRG LI-ION 10MSOP 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 |
| LTC1733EMSE#TRPBF | 功能描述:IC CHRGR BATT MONO THERML 10MSOP 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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