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参数资料
| 型号： | LTC4098EPDC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/32页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER USB COMP 20-UTQFN |
| 标准包装： | 2,500 |
| 系列： | Bat-Track™, PowerPath™ |
| 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： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-UTQFN-EP（3x4） |
| 包装： | 带卷 (TR) |
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LTC4098/LTC4098-1
OPERATION
NTC Thermistor
The battery temperature is measured by placing a nega-
tive temperature coefficient (NTC) thermistor close to
the battery pack. The NTC circuitry is shown in the Block
Diagram.
To use this feature, connect the NTC thermistor, R NTC ,
between the NTC pin and ground and a bias resistor, R NOM ,
from NTCBIAS 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 LTC4098/LTC4098-1 will pause charging when the
resistance of the NTC thermistor drops to 0.54 times the
value of R25 or approximately 54k (for a Vishay curve 1
thermistor, this corresponds to approximately 40°C). If
the battery charger is in constant-voltage (float) mode,
the safety timer also pauses until the thermistor indicates
a return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4098/
LTC4098-1 are 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.
Figure 6 is a flow chart representation of the battery charger
Thermal Regulation
To prevent thermal damage to the LTC4098/LTC4098-1 or
surrounding components, an internal thermal feedback
loop will automatically decrease the programmed charge
current if the die temperature rises to approximately 110°C.
Thermal regulation protects the LTC4098/LTC4098-1 from
excessive temperature due to high power operation or
high ambient thermal conditions, and allows the user to
push the limits of the power handling capability with a
given circuit board design without risk of damaging the
LTC4098/LTC4098-1 or external components. The benefit
of the LTC4098/LTC4098-1 thermal regulation loop is that
charge current can be set according to actual conditions
rather than worst-case conditions for a given application
with the assurance that the charger will automatically
reduce the current in worst-case conditions.
Shutdown Mode
The USB switching regulator is enabled whenever V BUS
is above the UVLO voltage and the LTC4098/LTC4098-1
are not in one of the two USB suspend modes (500μA or
2.5mA). When power is available from both the USB and
high voltage inputs, the high voltage regulator is prioritized
and the USB switching regulator is disabled.
The ideal diode is enabled at all times and cannot be
disabled.
algorithm employed by the LTC4098/LTC4098-1.
40981fc
20
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相关代理商/技术参数 |
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| LTC4098EUDC#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™ 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 |
| LTC4098EUDC#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: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 |
| LTC4098EUDC-1#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: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 |
| LTC4098EUDC-1#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: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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