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參數(shù)資料
| 型號(hào)： | SC805A |
| 廠商： | Semtech Corporation |
| 英文描述： | Miniature Integrated High Current Lithium-Ion Battery Charger |
| 中文描述： | 微型集成高電流鋰離子電池充電器 |
| 文件頁(yè)數(shù)： | 11/17頁(yè) |
| 文件大?。?/td> | 566K |
| 代理商： | SC805A |
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2007 Semtech Corp.
www.semtech.com
SC805A
POWER MANAGEMENT
Applications Information (Cont.)
Over-Current and Max Temperature Protection
Over-current protection is inherent in all modes of opera-
tion. When the device is in charge-mode the output is cur-
rent-limited to either the pre-charge current limit value or
the fast-charge current limit value depending on the voltage
at the output. When the device is in LDO mode, the output
current is limited to the fast-charge current limit. Max die
temperature protection is included on the SC805A. This
feature allows the SC805A to operate with maximum power
dissipation by disabling the output current when the die
temperature reaches OT. The result is that the SC805A
will operate as a pulse charger in extreme power dissipa-
tion applications delivering the maximum allowable output
current while regulating the internal die temperature to a
safe level.
Layout Guidelines
The two most critical aspects of the PCB layout are the
power path and thermal layout. The power path starts
at the Adapter + input and runs to the VCC input of the
SC805A, then from the VOUT pin of the SC805A to the Bat-
tery + terminal, and completes with the return trace from
the battery - terminal to the adapter - input. All of these
traces need to be designed to handle the required charging
current. The trace from VOUT of the SC805A is most critical
and should be made as wide as possible to minimize I×R
drops between the regulated voltage at the SC805A VOUT
pin and the battery terminal. Keep the Adapter+ to SC805A
VCC input trace wide to minimize voltage drops that will
add to the dropout voltage of the SC805A. The GND pin
of the SC805A should be connected in a Kelvin fashion at
the battery-terminal to eliminate voltage drops in the return
path which reduce the regulated battery voltage.
The thermal performance of the SC805A package requires
a low impedance connection from the heat slug on the
bottom of the package to an external ground plane. This
is best accomplished by using a single large via under the
device connected to a ground plane on the bottom exposed
side of the PCB. The evaluation board uses square inch
of copper on the bottom of the PCB and is capable of A
charging current.
The input and output bulk decoupling capacitors for the
SC805A should be placed near the external terminals for
the adapter and battery. This short low impedance loop
is for the high current spikes that result from input/output
hot-plugging of the charger. To minimize these current
spikes the value of the decoupling capacitor should be mini-
mized. A typical application requires a 0.μF input/output
capacitor. If the distance from the external terminals to
the SC805A is greater than inch, 0.μF local decoupling
capacitors at the SC805A may be required.
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相關(guān)代理商/技術(shù)參數(shù) |
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| SC805A_08 | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805AEVB | 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
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| SC805IMLTRT | 功能描述:IC LI-ION BATT CHARGER 10-MLP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測(cè)計(jì)/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱(chēng):497-10526-2 |
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