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参数资料
| 型号： | LTC4098EUDC-3.6#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, PQCC20 |
| 封装： | 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 18/32页 |
| 文件大小： | 1915K |
| 代理商： | LTC4098EUDC-3.6#PBF |
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LTC4098-3.6
409836f
are linked. Therefore, only one of the two trip points can
be chosen, the other is determined by the default ratios
designed in the IC. Consider an example where a 70°C
hot trip point is desired.
FromtheVishaycurve1R-Tcharacteristics,
aHOTis0.1753
at 70°C. Using the previous equation, RNOM should be set
to 70.4k. With this value of RNOM,thecoldtrippointis7°C.
Notice that the span is now 63°C rather than the previous
60°C. This is due to the decrease in temperature gain of
the thermistor as absolute temperature increases.
The upper and lower temperature trip points can be inde-
pendentlyprogrammedbyusinganadditionalbiasresistor
as shown in Figure 9b. The following formulas can be used
to compute the values of RNOM and R1:
R
NOM
cOLD
HOT
NOM
HOT
=
a
–
.
.
–
3 01
25
1 0 25
255
For example, to set the trip points to 0°C and 70°C with
a Vishay curve 1 thermistor choose:
R
k
NOM =
=
3 26 0 1753
3 01
100
102 5
. – .
.
.
the nearest 1% value is 102k:
R1 = 0.25 102k – 0.1753 100k = 7.97k
the nearest 1% value is 8.06k. The final circuit is shown
in Figure 9b and results in an upper trip point of 70°C and
a lower trip point of 0°C.
USB Inrush Limiting
The USB specification allows at most 10F of downstream
capacitance to be hot-plugged into a USB hub. In most
LTC4098-3.6 applications, 10F should be enough to
provide adequate filtering on VBUS.
Ifmorecapacitanceisrequired,theOVPcircuitwillprovide
adequate soft-connect time to prevent excessive inrush
currents. An additional 22F on the VBUS pin will gener-
ally contribute less than 100mA to the hot-plug inrush
current.
Voltage overshoot on VBUS may sometimes be observed
when connecting the LTC4098-3.6 to a lab power supply.
This overshoot is caused by long leads from the power
supply to VBUS. Twisting the wires together from the sup-
ply to VBUS can greatly reduce the parasitic inductance
of these long leads, and keep the voltage at VBUS to safe
levels. USB cables are generally manufactured with the
powerleadsincloseproximity,andthusfairlylowparasitic
inductance.
applicaTions inFormaTion
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相关代理商/技术参数 |
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| LTC4099 | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
| LTC4099EPDC#PBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列: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 |
| LTC4099EPDC#TRMPBF | 制造商:Linear Technology 功能描述: |
| LTC4099EPDC#TRPBF | 功能描述:IC USB PWR MANAGER/CHRGR 20UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列: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 |
| LTC4099EPDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection |
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