MC33389 datasheet(10/35 Pages) MOTOROLA

Part #	MC33389

Description	System Basis Chip with Low Speed Fault Tolerant CAN

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Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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MC33389

MOTOROLA

10

MC33389

DEVICE DESCRIPTION

Thermal Management

The MC33389 is proposed in two different packages.

HSOP20 for high power applications and SO28WB with 8 pins

to the leadframe for medium power applications.

HSOP20 Package

For such a package, the heat flow is mainly vertical and

each heat source (dissipating element) can be seen as an

independent thermal resistance to the Heatsink. The thermal

network can be roughly depicted as:

Figure 2. HSOP20 Simplified Thermal Model

Example

Assuming IV1=100mA at Vbat=16V,

IV2=150mA at Vbat=16V (Excluding CAN consumption).

ICAN=50mA at Vbat=16V, we have :

PV1=1.1W, PV2=1.65W, Pcan=0.55W

System assumptions:

If Tamb=85°C and Rthc/a=18°C/W, this gives:

Tcase=Tamb+Rth c/a x 3.3W = 85+18 x 3.3=145°C

and TjV1=TjV2=Tjcan=155°C.

This example represents the limit for the maximum power

dissipations with a HSOP20.

Tambient

Tcase(heatsink)

V1 power

V2 power

Can power

Tj (max 155°C)

Rthj/c=18°C/W

6.5°C/W

9°C/W

Rthc/a (ECU supplier dependent)

SO28WB Package

The case(pin) to junction Rth is here represented by only

one thermal resistance for the total power since the 3 power

sources strongly interact on the silicon for such a package.

Figure 3. SO28WB Simplified Thermal Model

Example

Assuming IV1=45mA at Vbat=16V,

IV2=45mA at Vbat=16V (Excluding CAN consumption).

ICAN=50mA at Vbat=16V, we have :

PV1=0.5W, PV2=0.5W, Pcan=0.55W thus Ptotal=1.55W

System assumptions:

If Tamb=85°C and Rthc/a=25°C/W, this gives:

Tcase=Tamb+Rthc/a x 1.55W=85+25x1.55 =124°C

and TjV1=124 + 20 x 1.55= 155°C.

This example represents the limit for the maximum power

dissipations with a SO28WB.

Tcase(pin)

Tj (max 155°C)

Total power

Rthc/a

Tambient

Rthj/c=20°C/W

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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