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參數(shù)資料
| 型號： | LTC4097EDDB |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO12 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, PLASTIC, DFN-12 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 219K |
| 代理商： | LTC4097EDDB |
LTC4097
13
4097f
Manual Shutdown
The SUSP pin has a 3.4MΩ 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 20A when the charger is in shut-
down. The USBIN input draws 20A during shutdown if
no power is applied to DCIN, but draws only 10A when
VDCIN > VUSBIN.
NTC Thermistor
The battery temperature is measured by placing a nega-
tive temperature coefcient (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, RNTC, between the NTC pin and ground and a
bias resistor, RNOM, from VNTC 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 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
temperature drops, the resistance of the NTC thermistor
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.
OPERATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4097EDDB#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 1200mA 4.2V 12-Pin DFN EP |
| LTC4097EDDB#TRMPBF | 功能描述:IC CHARGER LI-ION/POLY 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
| LTC4097EDDB#TRPBF | 功能描述:IC CHARGER LI-ION/POLY 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標準包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4098 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual-Input Power Manager |
| LTC4098-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual-Input Power Manager |
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