L6234
THERMAL DATA
Symbol
Rth j-pin
Parameter
DIP16+2+2
12
PowerSO20
–
Unit
C/W
°
Thermal Resistance, Junction to Pin
Thermal Resistance, Junction to Ambient
(see Thermal Characteristics)
Rth j-amb1
40
–
C/W
°
Thermal Resistance, Junction to Ambient (see Thermal
Characteristics)
Rth j-amb2
Rth j-case
50
–
–
C/W
°
1.5
°C/W
Thermal Resistance Junction-case
ones), as well as the others, have a minimum
thermal connection with the external world (very
thin strips only) so that the dissipation takes place
through still air and through the PCB itself.
It is the same situation of point above, without any
heatsinking surface created on purpose on the
board.
THERMAL CHARACTERISTICS
Rth j-pins
DIP16+2+2
. The thermal resistance is referred to
the thermal path from the dissipating region on
the top surface of the silicon chip, to the points
along the four central pins of the package, at a
distance of 1.5 mm away from the stand-offs.
Additional data on the PowerDip and the
PowerSO20 package can be found in:
Rth j-amb1
If a dissipating surface, thick at least 35 µm, and
with a surface similar or bigger than the one
shown, is created making use of the printed cir-
cuit.
Such heatsinking surface is considered on the
bottomside of an horizontal PCB (worst case).
Application Note AN467:
Thermal Characteristics of the PowerDip
20,24 Packages Soldered on 1,2,3 oz.
Copper PCB
Application Note AN668:
A New High Power IC Surface Mount Package:
PowerSO20 Power IC Packaging from Insertion
to Surface Mounting.
Rth j-amb2
If the power dissipating pins (the four central
Figure 1: Printed Heatsink
3/10