CM3014-18ST Ver la hoja de datos (PDF) - California Micro Devices Corp

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CM3014-18ST

Micropower, 150mA Low Dropout CMOS Regulator

California Micro Devices Corp 

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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 layout. The

final operating junction temperature for any set of con-

ditions can be estimated by the following thermal equa-

tion:

TJUNC = TAMB + PD ∗ (θJC) + PD ∗ (θCA)

= TAMB + PD ∗ (θJA)

The CM3014 uses a SOT23-5 package. 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 175°C/W.

Based on a maximum power dissipation of 320mW

(Load x Vin-Vout = 150mA x 2.2V) with an ambient of

70°C the resulting junction temperature will be:

TJUNC = TAMB + PD ∗ (θJA)

= 70°C + 315mW ∗ (175°C/W)

= 70°C + 57.75°C = 127.75°C

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Measurements showing performance up to a junction

temperature of 125°C were performed under light load

conditions (1mA). This allows the ambient temperature

to be representative of the internal junction tempera-

ture.

Note: The use of multi-layer board construction with

separate ground and power planes will further enhance

the overall thermal performance. In the event of no

copper area being dedicated for heat spreading, a

multi-layer board construction using only the minimum

size pad layout will typically provide the CM3014 with

an overall θJA of 175°C/W, which allows up to 450mW

to be dissipated safely.

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Output Voltage Change vs. Temperature (1mA Load)

50

40

30

20

10

0

-10

-20

-30

-40

-50

-50 -25 0 25 50 75 100 125

TEMPERATURE [oC]

Ground Current vs. Temperature

100

80

60

40

20

0

0

25

50 75 100 125

JUNCTION TEMPERATURE [oC]

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‹ 2002 California Micro Devices Corp. All rights reserved.

8 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 L Tel: 408.263.3214

L Fax: 408.263.7846 L www.calmicro.com

12/13/02

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