440EPX datasheet(72/94 Pages) AMCC

72 / 94 page

Thermal resistance values for the TE-PBGA package in a convection environment at 6.3W are as follows:

Parameter

Symbol

Airflow

ft/min

(m/sec)

Unit

Notes

(0)

100

(0.51)

200

(1.02)

300

(1.53

400

(2.04)

500

(2.55)

Junction-to-ambient thermal resistance

without heat sink

13.1

11.7

10.9

10.5

10.3

°C/W

Junction-to-ambient thermal resistance

with heat sink

11.1

8.2

7.2

6.8

6.6

6.3

°C/W

5, 6

Resistance Value

Junction-to-case thermal resistance

3.5

°C/W

Junction-to-board thermal resistance

7.3

°C/W

Notes:

1. Case temperature, TC, is measured at top center of case surface with device soldered to circuit board.

2. TA = TC − P×θCA, where TA is ambient temperature and P is power consumption.

3. TCMax = TJMax − P×θJC, where TJMax is maximum junction temperature (+125°C) and P is power consumption.

4. The preceding equations assume that the chip is mounted on a board with at least one signal and two power planes.

5. Values in the table were achieved using a JEDEC standard board with the following characteristics: 114.5mm x 101.6mm x 1.6mm, 4

layers. The board has 100 thermal vias (same as the number of thermal balls on the TE-PBGA package).

6. Values for an attached heat sink were achieved with a 35mm x 35mm x 15mm unit (see Thermal Management below), attached with a

0.1mm thickness of adhesive having a thermal conductivity of 1.3W/mK.

440EPx – PPC440EPx Embedded Processor

Preliminary Data Sheet

AMCC Proprietary

Revision 1.26 – October 15, 2007

Thermal Management

The following heat sink was used in the above thermal analysis:

ALPHA LPD35-15B (35mm x 35mm x15mm)

The heat sink is manufactured by:

Alpha Novatech, Inc. (www.alphanovatech.com)

473 Sapena Court, #12

Santa Clara, CA 95054

Phone: 408-567-8082

Table 17. Package Thermal Specifications

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