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参数资料
| 型号： | PowerPC 750 |
| 厂商： | IBM Microeletronics |
| 英文描述： | 32-Bit Embedded Microprocessor(32位精简指令集嵌入式微处理器) |
| 中文描述： | 32位嵌入式微处理器（32位精简指令集嵌入式微处理器） |
| 文件页数： | 40/46页 |
| 文件大小： | 610K |
| 代理商： | POWERPC 750 |
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Page 36
Version 2.0
Datasheet
9/30/99
PowerPC 750 SCM RISC Microprocessor
PID8p-750
Preliminary Copy
Internal Package Conduction Resistance
For the exposed-die packaging technology, shown in Table “Package Thermal Characteristics,” on page 7,
the intrinsic conduction thermal resistance paths are as follows.
Die junction-to-case thermal resistance
Die junction-to-lead thermal resistance
Figure 19 depicts the primary heat transfer path for a package with an attached heat sink mounted to a
printed-circuit board.
Heat generated on the active side (ball) of the chip is conducted through the silicon, then through the heat
sink attach material (or thermal interface material), and finally to the heat sink; where it is removed by forced-
air convection. Since the silicon thermal resistance is quite small, for a first-order analysis, the temperature
drop in the silicon may be neglected. Thus, the heat sink attach material and the heat sink conduction/con-
vective thermal resistances are the dominant terms.
Adhesives and Thermal Interface Materials
A thermal interface material is recommended at the package lid-to-heat sink interface to minimize the thermal
contact resistance. For those applications where the heat sink is attached by a spring clip mechanism,
Figure 20 shows the thermal performance of three thin-sheet thermal-interface materials (silicon, graphite/oil,
floroether oil), a bare joint, and a joint with thermal grease, as a function of contact pressure. As shown, the
performance of these thermal interface materials improves with increasing contact pressure. The use of ther-
mal grease significantly reduces the interface thermal resistance. That is, the bare joint results in a thermal
resistance approximately 7 times greater than the thermal grease joint.
Figure 19. C4 Package with Heat Sink Mounted to a Printed-Circuit Board
External Resistance
External Resistance
Internal Resistance
(Note the internal versus external package resistance.)
Radiation
Convection
Radiation
Convection
Heat Sink
Die/Package
Chip Junction
Printed-Circuit Board
Thermal Interface Material
Package/Leads
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