參數(shù)資料
型號： LTC4098EUDC-3.6#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： BATTERY CHARGE CONTROLLER, PQCC20
封裝： 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁數(shù)： 18/32頁
文件大?。?/td> 1915K
代理商： LTC4098EUDC-3.6#TRPBF
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4099 制造商:LINER 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
LTC4099EPDC#TRMPBF 制造商:Linear Technology 功能描述:
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LTC4099EPDC-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:I2C Controlled USB Power Manager/Charger with Overvoltage Protection
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