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參數(shù)資料
| 型號： | LTC4098EUDC-3.6#PBF |
| 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)： | 11/32頁 |
| 文件大?。?/td> | 1915K |
| 代理商： | LTC4098EUDC-3.6#PBF |
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LTC4098-3.6
409836f
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, RNTC,
between the NTC pin and ground and a bias resistor, RNOM,
from NTCBIAS to NTC. RNOM should be a 1% resistor with
a value equal to the value of the chosen NTC thermistor
at 25°C (R25).
The LTC4098-3.6 will pause charging when the resistance
of the NTC thermistor drops to 0.25 times the value of R25
or approximately 25k (for a Vishay curve 1 thermistor, this
correspondstoapproximately60°C).Ifthebatterycharger
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
theNTCthermistorrises.TheLTC4098-3.6isalsodesigned
to pause charging when the value of the NTC thermistor
increases to 3.26 times the value of R25. For a Vishay
curve 1 thermistor, this resistance, 326k, corresponds to
approximately 0°C. The hot and cold comparators each
have approximately 3°C of hysteresis to prevent oscilla-
tion about the trip point. Grounding the NTC pin disables
all NTC functionality.
Figure6isaflowchartrepresentationofthebatterycharger
algorithm employed by the LTC4098-3.6.
Thermal Regulation
To prevent thermal damage to the LTC4098-3.6 or sur-
rounding components, an internal thermal feedback loop
willautomaticallydecreasetheprogrammedchargecurrent
if the die temperature rises to approximately 110°C. Ther-
mal regulation protects the LTC4098-3.6 from excessive
temperature due to high power operation or high ambi-
ent 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 LTC4098-3.6
or external components. The benefit of the LTC4098-3.6
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 VBUS is
above the UVLO voltage and the LTC4098-3.6 is not in one
of the two USB suspend modes (500A 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.
operaTion
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| 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: |
| LTC4099EPDC#TRPBF | 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-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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