MPC8535EBVTATH datasheet(110/126 Pages) FREESCALE

110 / 126 page

MPC8535E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 2

Thermal

Freescale Semiconductor

110

Simulations with heat sinks were done with the package mounted on the 2s2p thermal test board. The thermal interface material

was a typical thermal grease such as Dow Corning 340 or Wakefield 120 grease.For system thermal modeling, the MPC8535E

thermal model without a lid is shown in Figure 72 The substrate is modeled as a block 29 x 29 x 1.2 mm with an in-plane

conductivity of 19.8 W/m•K and a through-plane conductivity of 1.13 W/m•K. The solder balls and air are modeled as a single

block 29 x 29 x 0.5 mm with an in-plane conductivity of 0.034 W/m•K and a through plane conductivity of 12.1 W/m•K. The

die is modeled as 9.6 x 9.57 mm with a thickness of 0.75 mm. The bump/underfill layer is modeled as a collapsed thermal

resistance between the die and substrate assuming a conductivity of 7.5 W/m•K in the thickness dimension of 0.07 mm. The die

is centered on the substrate. The thermal model uses approximate dimensions to reduce grid. Please refer to the case outline for

actual dimensions.

2.24.2

Recommended Thermal Model

Junction-to-ambient (@200 ft/min)

Four layer board (2s2p)

RθJA

°C/W

1, 2

Junction-to-board thermal

—

RθJB

°C/W

Junction-to-case thermal

—

RθJC

< 0.1

°C/W

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 JEDEC JESD51-2 and JESD51-6 with the board (JESD51-9) horizontal.

3. 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.

4. Thermal resistance between the active surface of the die and the case top surface determined by the cold plate method

(MIL SPEC-883 Method 1012.1) with the calculated case temperature. Actual thermal resistance is less than 0.1 •C/W

C/W

Table 80. MPC8535E Thermal Model

Conductivity

Value

Units

Die (9.6x9.6

× 0.85 mm)

Silicon

Temperature dependent

—

Bump/Underfill (9.6 x 9.6

× 0.07 mm) Collapsed Thermal Resistance

7.5

W/m•K

Substrate (29

× 29 × 1.2 mm)

19.8

W/m•K

19.8

1.13

Solder and Air (29

× 29 × 0.5 mm)

0.034

W/m•K

0.034

12.1

Table 79. Package Thermal Characteristics (continued)

Characteristic

JEDEC Board

Symbol

Value

Unit

Notes

MPC8535EBVTATH Datasheet(PDF) 110 Page - Freescale Semiconductor, Inc

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