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參數(shù)資料
| 型號(hào)： | SC805 |
| 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)： | 15/15頁(yè) |
| 文件大?。?/td> | 294K |
| 代理商： | SC805 |
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9
2005 Semtech Corp.
www.semtech.com
SC805
POWER MANAGEMENT
Applications Information (Cont.)
The CHRGB indicator operates the same way in both
charge and LDO mode.
The CHRGB output can be used for a VCC indicator. When
the SC805 is enabled the CHRGB output is either high
or low providing the VCC input is above UVLO. Alternately
an LED connected to VCCIL can be used for a VCC indi-
cator as shown in the typical application schematic on
the front page of the datasheet.
There are five fault modes detected by the SC805; (In-
put under voltage, input over voltage, NTC temperature,
Max die temperature or OT and pre-charge timeout). The
LED states for these fault modes are shown below.
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Overcurrent and Max Temperature Protection
Overcurrent protection is inherent in all modes of opera-
tion. When the device is in charge-mode the output is
current 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
SC805. This feature allows the SC805 to operate with
maximum power dissipation by disabling the output cur-
rent when the die temperature reaches OT. The result is
that the SC805 will operate as a pulse charger in ex-
treme power dissipation applications delivering the maxi-
mum allowable output current while regulating the inter-
nal 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
SC805, then from the Vout pin of the SC805 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 charg-
ing current. The trace from Vout of the SC805 is most
critical and should be made as wide as possible to mini-
mize IR drops between the regulated voltage at the
SC805 vout pin and the battery terminal. Keep the
Adapter+ to SC805 VCC input trace wide to minimize
voltage drops that will add to the dropout voltage of the
SC805. The GND pin of the SC805 should be connected
in a kelvin fashion at the Battery-terminal to eliminate
voltage drops in the return path which reduce the regu-
lated battery voltage.
The thermal performance of the SC805 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 1
square inch of copper on the bottom of the pcb and is
capable of 1A charging current.
The input and output bulk decoupling capacitors for the
SC805 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/out-
put hot-plugging of the charger. To minimize these cur-
rent spikes the value of the decoupling capacitor should
be minimized. A typical application requires a 0.1F in-
put/output capacitor. If the distance from the external
terminals to the SC805 is greater than 1”, 0.1 local
decoupling capacitors at the SC805 may be required.
相關(guān)PDF資料 |
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| SC806 | Miniature High Current Lithium-Ion Battery Charger |
| SCD25-590-318-15 | 50 CONTACT(S), MALE, STRAIGHT BOARD STACKING CONNECTOR, SOLDER |
| SCDS1014R-220M-S | 1 ELEMENT, 22 uH, GENERAL PURPOSE INDUCTOR, SMD |
| SCDS105R-820T-N | 1 ELEMENT, 82 uH, GENERAL PURPOSE INDUCTOR, SMD |
| SCDS2D11T-220T-N | 1 ELEMENT, 22 uH, FERRITE-CORE, GENERAL PURPOSE INDUCTOR, SMD |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC805A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805A_08 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805AEVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
| SC805AMLTRT | 制造商:Semtech Corporation 功能描述:Current/Constant Voltage Li-Ion/NiCD/NiMH 1000mA 4.2V 10-Pin MLP EP T/R |
| SC805EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Miniature Integrated High Current Lithium-Ion Battery Charger |
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