參數(shù)資料
型號: STPCC0166BTI3
廠商: STMICROELECTRONICS
元件分類: 外設及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA388
封裝: PLASTIC, BGA-388
文件頁數(shù): 60/71頁
文件大?。?/td> 1238K
代理商: STPCC0166BTI3
Obsolete
Product(s)
- Obsolete
Product(s)
DESIGN GUIDELINES
Issue 2.4 - November 8, 2001
63/71
When considering thermal dissipation, one of the
most important parts of the layout is the connec-
tion between the ground balls and the ground lay-
er.
A 1-wire connection is shown in Figure 6-9. The
use of a 8-mil wire results in a thermal resistance
of 105°C/W assuming copper is used (418 W/
m.°K). This high value is due to the thickness (34
m) of the copper on the external side of the PCB.
Considering only the central matrix of 36 thermal
balls and one via for each ball, the global thermal
resistance is 2.9°C/W. This can be easily im-
proved using four 12.5 mil wires to connect to the
four vias around the ground pad link as in Figure
6-10. This gives a total of 49 vias and a global re-
sistance for the 36 thermal balls of 0.5°C/W.
The use of a ground plane like in Figure 6-11 is
even better.
Figure 6-9. Recommended 1-wire Power/Ground Pad Layout
Solder Mask (4 mil)
Pad for ground ball (diameter = 25 mil)
Hole to ground layer (diameter = 12 mil)
Connection Wire (width = 12.5 mil)
Via (diameter = 24 mil)
34.
5 mi
l
1 mil = 0.0254 mm
Figure 6-10. Recommended 4-wire Ground Pad Layout
4 via pads for each ground ball
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