CM3004-25SF CALMIRCO [California Micro Devices Corp], CM3004-25SF Datasheet - Page 7

• Manufacturer Part Number: CM3004-25SF
• Description: 1.0 Amp Dual Mode Low-Dropout CMOS Regulator
• Manufacturer: CALMIRCO [California Micro Devices Corp]

Performance Information (cont’d)
CM3004 Typical Thermal Characteristics
The overall junction to ambient thermal resistance
(
rily of two paths in series. The first path is the junction
to the case (
style, and the second path is case to ambient (
thermal resistance which is dependent on board lay-
out. The final operating junction temperature for any
set of conditions can be estimated by the following
thermal equation:
The CM3004 uses a thermally enhanced package
where all the GND pins (5 through 8) are integral to the
leadframe. When this package is mounted on a double
sided printed circuit board with two square inches of
copper allocated for "heat spreading", the resulting
is about 50°C/W.
Based on a typical operating power dissipation of 1.0W
with an ambient of 85°C, the resulting junction temper-
ature will be:
Thermal characteristics were measured using a double
sided board with two square inches of copper area
connected to the GND pins for "heat spreading". Mea-
surement was performed under light load conditions
(5mA).
© 2005 California Micro Devices Corp. All rights reserved.
01/10/05
θ
JA
) for device power dissipation (PD) consists prima-
T
JUNC
T
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
JUNC
= T
= T
= T
θ
= 85°C + 1.0W (50°C/W)
= 85°C + 50°C = 135°C
AMB
JC
AMB
AMB
) which is defined by the package
+ P
+ P
+ P
D
D
D
(
(
θ
(
θ
θ
JA
JC
JA
)
) + P
)
D
(
θ
CA
)
●
θ
θ
CA
Tel: [phone]
JA
)
2.60
2.55
2.50
2.45
2.40
1.25
1.23
1.21
1.19
1.17
1.15
-40
Tem perature vs. Output Voltage (1.2V)
●
Temperature vs. Output Voltage ( 2.5V )
-25
Fax: [phone]
-40
0
25
Tem perature ('C)
Tem perature ('C)
50
25
75
●
PRELIMINARY
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85
100
CM3004
85
125
150
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