AIC1531 ETC2 [List of Unclassifed Manufacturers], AIC1531 Datasheet - Page 8

• Manufacturer Part Number: AIC1531
• Description: 500mA Dual Linear Regulator with Internal Power Switch
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

Fig.20 The power thermal shutdown dissipation vs. ambient temperature where R
Instead, they rely on the printed-circuit board to
provide the thermal path. When the AIC1531
operates normally, the maximum power dissipation
is
At the maximum operation temperature, the thermal
resistance seen by the device, or the combination of
all
When the device is mounted on a double-sided
printed circuit board, the ground plane is the most
P
R
D
JA
(V
the
165
IN
0.85
V
85
OUT
thermal
)
94
I
OUT
C/W
paths,
.
(5
3.3)
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
should
0
0.5
Fig.19 The layout of AIC1531
0.85W
20
Ambient Temperature ( C)
be
chamber
40
60
used thermal path. To make sure the thermal
resistance small enough and the shutdown function
work normally, the thermal resistance between
GND pins to GND plane should be as small as
possible by means of adding more vias. And the
GND plane should be at least 1 square centimeters
of copper.
The layout of AIC1531 is shown in Fig.1. In Fig. 2,
the thermal resistance R
AIC1531 is mounted on the double-sided PCB and
measured under the forced-air thermal chamber.
80
100
JA
is 70.36 C/W in the forced-air thermal
JA
is 70.36 C/W where the
AIC1531
8