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SC801 参数 Datasheet PDF下载

SC801图片预览
型号: SC801
PDF下载: 下载PDF文件 查看货源
内容描述: 完全集成的高Currnet锂离子电池充电器系统 [Fully Integrated High Currnet Lithium-Ion Battery Charger System]
分类和应用: 电池
文件页数/大小: 17 页 / 361 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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SC801  
POWER MANAGEMENT  
Applications Information (Cont.)  
Layout Guidelines  
Try to keep the traces from the adaptor input to the VCC  
pins as wide as possible, to eliminate any voltage drop  
across the device input traces. You want to make sure  
the input-to-output voltage differential of the device does  
not approach the dropout voltage. A curve of the drop-  
out voltage vs. output current is shown on page 15. Any  
voltage dropped over the input traces from the adaptor  
will reduce the dropout voltage margin.  
Make the high current output trace from the VOUT pins  
as wide as possible. The BSEN line should be used prop-  
erly to compensate for any voltage drops from the out-  
put trace to the battery. Make a Kelvin connection with  
the BSEN trace to where VOUT connects the battery ter-  
minals. This is done by taking the BSEN trace and tying it  
to the VOUT trace as close to the battery terminals as  
possible. This way, any voltage drop across the trace re-  
sistance to the battery will be compensated for because  
BSEN will regulate the device output voltage (VOUT) at  
the point it connects to the VOUT trace. If you tie the  
BSEN line to the VOUT pin at the device you will eliminate  
the benefit of its purpose and the trace resistance drop  
will not be compensated. Therefore, it is best to have  
the BSEN trace follow in parallel the VOUT trace and tie  
them together at the contact point of the battery termi-  
nal for the best result.  
The bottom of the SC801 package has a heat slug and  
this slug should be tied to a ground plane of the PCB  
through one large via or a series of smaller vias. If there  
is no ground plane, an area should be dedicated on the  
bottom of the PCB to act as a heat sink. The evaluation  
board has 1 square inch of copper and allows an output  
current of greater that 1A. The more copper tied to this  
slug the greater the output current available before ther-  
mal limitations dominate. The two pins that are labeled  
NC are not connected to the die. Therefore, tying these  
pins to the ground plane offers no aide in heat removal  
and has no electrical benefit.  
2002 Semtech Corp.  
9
www.semtech.com