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SC420AIMLTRT 参数 Datasheet PDF下载

SC420AIMLTRT图片预览
型号: SC420AIMLTRT
PDF下载: 下载PDF文件 查看货源
内容描述: 高速,组合式SenseTM ,为移动应用程序同步功率MOSFET驱动器 [High Speed, Combi-SenseTM, Synchronous Power MOSFET Driver for Mobile Applications]
分类和应用: 驱动器
文件页数/大小: 16 页 / 744 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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SC420A  
POWER MANAGEMENT  
Applications Information (Cont.)  
Start-up Sequencing  
Manufacturing Guidlines  
Proper sequencing of the Combi-SenseTM controller and  
SC420A driver during both start-up and shut-down is very  
important. In general, the design must ensure that the  
driver powers up (during start-up) before the controller does,  
and that the driver powers down last during shut-down.  
This ensures that the driver will never issue gate drive  
pulses that are not well-controlled.  
Detailed information on manufacturing and rework  
of PCBs using the MLP package can be found in the  
MLP application note “Comprehensive User’s Guide  
- Micro Lead Frame Package”. Please contact your  
local Semtech representative to obtain a copy of this  
application note.  
In general it is recommended that the Vcc’s for the Combi-  
Sense Controller and SC420A be connected to the same  
(5V) supply. If the EN controls are not used (tied high)  
then the UVLO settings for the controller and driver will  
guarantee the proper sequencing (the SC420A maximum  
UVLO value is guaranteed to be lower than the Combi-  
SenseTM Controller minimum UVLO value).  
For absolute guarantee of proper sequencing it is recom-  
mended that the EN controls be used as shown in the  
following block diagram. With this arrangement the de-  
layed PWRGD signal from the VccVID regulator is used to  
enable both ICs. The Soft-Start time established for the  
controller ensures it will come up well after the SC420A.  
During power-down de-assertion of VID_PWRGD will en-  
sure simultaneous disabling of the Combi-SenseTM Control-  
ler and SC420A.  
V5  
SYS_PWRGD  
SC1403  
V3  
VR_ON  
Vcc-CORE  
Combi-  
CO  
SenseTM  
Controller  
EN  
SC420A  
EN  
VccVID Regulator  
VID_PWRGD  
VccPWRGD  
10  
2004 Semtech Corp.  
United States Patent No. 6,441,597  
www.semtech.com