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PAM3112 датащи(PDF) 8 Page - Power Analog Micoelectronics

номер детали PAM3112
подробное описание детали  300mA CMOS Linear Regulator
PDF  16 Pages
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производитель  PAM [Power Analog Micoelectronics]
домашняя страница  http://www.poweranalog.com
Logo PAM - Power Analog Micoelectronics

PAM3112 датащи(HTML) 8 Page - Power Analog Micoelectronics

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8
PAM3112
300mA CMOS Linear Regulator
Where T
is the maximum allowable junction
temperature 125°C, T is the ambient temperature
and
is the thermal resistance from the junction
to the ambient.
For example, as
is 250°C/W for the SOT-23
package based on the standard JEDEC 51-3 for a
single-layer thermal test board, the maximum
power dissipation at T =25°C can be calculated
by following formula:
P
=(125°C-25°C)/250=0.4W SOT-23
It is also useful to calculate the junction
temperature of the PAM3112 under a set of
specific condition. Suppose the input voltage
V =3.3V, the output current I =150mA and the
case temperature T =40°C measured by a
thermal couple during operation, the power
dissipation is defined as:
P =(3.3V-1.2V)*150mA+3.3V*70 A
315mW
And t he junction temperature T
can b e
calculated as follows:
T= T
T = 40°C+0.35W*250°C/W
=40°C+78.75°C
=118.75°C<T
= 125°C
For this application, T is lower than the absolute
maximum operating junction temperature
125°C, so it is safe to use the PAM3112 in this
configuration.
J(MAX)
A
JA
A
D(MAX)
IN
O
A
D
J
JA
A
J
J(MAX)
J
θ
θ
μ
+P *θ
JA
DJ
≌
10/2008 Rev 1.3
,
Power Analog Microelectronics Inc
www.poweranalog.com



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