TS8388BVFS datasheet(45/57 Pages) ATMEL

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TS8388B

2144C–BDC–04/03

Nominal CQFP68

Thermal

Characteristics

Although the power dissipation is low for this performance, the use of a heat sink is

mandatory.

The user will find some advice on this topics below.

Thermal Resistance

from Junction to

Ambient: RTHJA

The following table lists the converter thermal performance parameters, with or without

heatsink.

For the following measurements, a 50 x 50 x 16 mm heatsink has been used (see Figure 51

on page 46).

Note:

1. Heatsink is glued to backside of package or screwed and pressed with thermal grease.

Figure 50. Thermal Resistance from Junction to Ambient: Rthja

Table 10. Thermal Resitance

Air Flow

(m/s)

ja Thermal Resistance (

°C/W)

CQFP68 on Board

Estimated – Without Heatsink

Targeted – With Heatsink(1)

050

0.5

8.9

135

7.9

1.5

7.3

230

6.8

2.5

6.5

326

6.2

424

5.8

523.5

5.6

Air flow (m/s)

Without heatsink

With heatsink

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