CM3004-25SF datasheet(7/9 Pages) CALMIRCO

Part #	CM3004-25SF

Description	1.0 Amp Dual Mode Low-Dropout CMOS Regulator

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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7 / 9 page

01/10/05

430 N. McCarthy Blvd., Milpitas, CA 95035-5112

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Tel: 408.263.3214

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Fax: 408.263.7846

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www.calmicro.com

7

CM3004

PRELIMINARY

Performance Information (cont’d)

CM3004 Typical Thermal Characteristics

The overall junction to ambient thermal resistance

(

θJA) for device power dissipation (PD) consists prima-

rily of two paths in series. The first path is the junction

to the case (

θJC) which is defined by the package

style, and the second path is case to ambient (

θCA)

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:

TJUNC = TAMB + PD (θJC) + PD (θCA)

= TAMB + PD (

θJA)

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

θJA

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:

TJUNC = TAMB + PD (θJA)

= 85°C + 1.0W (50°C/W)

= 85°C + 50°C = 135°C

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).

Temperature vs. Output Voltage (1.2V)

1.15

1.17

1.19

1.21

1.23

1.25

-40

25

85

Temperature ('C)

Temperature vs. Output Voltage ( 2.5V )

2.40

2.45

2.50

2.55

2.60

-40

-25

0

25

50

75

85

100 125 150

Temperature ('C)

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CM3004-25SF Datasheet(PDF) 7 Page - California Micro Devices Corp

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