MPC8349VVALF View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
MFG CO.
MPC8349VVALF
Freescale Semiconductor
'MPC8349VVALF' PDF : 88 Pages View PDF
20 Thermal
This section describes the thermal specifications of the MPC8349E.
Thermal
20.1 Thermal Characteristics
Table 59 provides the package thermal characteristics for the 672 35 × 35 mm TBGA of the MPC8349E.
Table 59. Package Thermal Characteristics for TBGA
Characteristic
Symbol
Value
Unit Notes
Junction-to-ambient natural convection on single-layer board (1s)
RθJA
14
°C/W
1, 2
Junction-to-ambient natural convection on four-layer board (2s2p)
RθJMA
11
°C/W
1, 3
Junction-to-ambient (@ 200 ft/min) on single-layer board (1s)
RθJMA
11
°C/W
1, 3
Junction-to-ambient (@ 200 ft/min) on four-layer board (2s2p)
RθJMA
8
°C/W
1, 3
Junction-to-ambient (@ 2 m/s) on single-layer board (1s)
RθJMA
9
°C/W
1, 3
Junction-to-ambient (@ 2 m/s) on four-layer board (2s2p)
RθJMA
7
°C/W
1, 3
Junction-to-board thermal
RθJB
3.8
°C/W
4
Junction-to-case thermal
RθJC
1.7
°C/W
5
Junction-to-package natural convection on top
ψJT
1
°C/W
6
Notes:
1. Junction temperature is a function of die size, on-chip power dissipation, package thermal resistance, mounting site (board)
temperature, ambient temperature, air flow, power dissipation of other components on the board, and board thermal
resistance.
2. Per SEMI G38-87 and JEDEC JESD51-2 with the single-layer board horizontal.
3. Per JEDEC JESD51-6 with the board horizontal, 1 m/s is approximately equal to 200 linear feet per minute (LFM).
4. Thermal resistance between the die and the printed-circuit board per JEDEC JESD51-8. Board temperature is measured on
the top surface of the board near the package.
5. Thermal resistance between the die and the case top surface as measured by the cold plate method (MIL SPEC-883 Method
1012.1).
6. Thermal characterization parameter indicating the temperature difference between package top and the junction temperature
per JEDEC JESD51-2. When Greek letters are not available, the thermal characterization parameter is written as Psi-JT.
20.2 Thermal Management Information
For the following sections, PD = (VDD × IDD) + PI/O where PI/O is the power dissipation of the I/O drivers.
See Table 5 for I/O power dissipation values.
20.2.1 Estimation of Junction Temperature with Junction-to-Ambient
Thermal Resistance
An estimation of the chip junction temperature, TJ, can be obtained from the equation:
TJ = TA + (RθJA × PD)
MPC8349E PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10
Freescale Semiconductor
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