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参数资料
| 型号： | LTC4097EDDB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION/POLY 12-DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 包装： | 带卷 (TR) |
LTC4097
OPERATION
Manual Shutdown
The SUSP pin has a 3.4M Ω pulldown resistor to GND. A
logic low enables the charger and a logic high disables it
(the pulldown defaults the charger to the charging state).
The DCIN input draws 20μA when the charger is in shut-
down. The USBIN input draws 20μA during shutdown if
no power is applied to DCIN, but draws only 10μA when
V DCIN > V USBIN .
NTC Thermistor
The battery temperature is measured by placing a nega-
tive temperature coef?cient (NTC) thermistor close to
the battery pack. The NTC circuitry is shown in the Block
Diagram of Figure 4. To use this feature, connect the NTC
thermistor, R NTC , between the NTC pin and ground and a
bias resistor, R NOM , from VNTC to NTC. R NOM should be
a 1% resistor with a value equal to the value of the chosen
NTC thermistor at 25°C (R25).
The LTC4097 will pause charging when the resistance of
the 100k NTC thermistor drops to 0.54 times the value of
R25 or approximately 54k (for a Vishay “Curve 1” therm-
istor, this corresponds to approximately 40°C). As the
rises. The LTC4097 is also designed to pause charging
when the value of the NTC thermistor increases to 3.25
times the value of R25. For a Vishay “Curve 1” thermistor
this resistance, 325k, corresponds to approximately 0°C.
The hot and cold comparators each have approximately
3°C of hysteresis to prevent oscillation about the trip point.
Grounding the NTC pin disables all NTC functionality.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise
above a preset value of approximately 115°C. This feature
protects the LTC4097 from excessive temperature and
allows the user to push the limits of the power handling
capability of a given circuit board without risk of damag-
ing the device. The charge current can be set according
to typical (not worst case) ambient temperature with the
assurance that the charger will automatically reduce the
current in worst case conditions. A safety thermal shut
down circuit will turn off the charger if the die temperature
rises above a value of approximately 150°C. DFN power
considerations are discussed further in the Applications
Information section.
temperature drops, the resistance of the NTC thermistor
4097f
13
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| LTC4098 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual-Input Power Manager |
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| LTC4098EPDC#PBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC4098EPDC#TRPBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
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