CM3001 查看數據表（PDF） - California Micro Devices Corp

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CM3001

Micropower 500mA Low Voltage CMOS Regulator

California Micro Devices Corp 

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

= TAMB + PD ∗ (θJA)

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Based on a power dissipation of .8W (Load x Vin-Vout =

.4A x [3.3V-1.3V]) with an ambient of 70°C, the result-

ing junction temperature will be:

TJUNC = TAMB + PD ∗ (θJA)

= 70°C + .8W ∗ (70°C/W)

= 70°C + 55°C = 125°C

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Measurements showing performance up to a junction

temperature of 125°C are presented in )LJXUH  They

were performed under light load conditions (5mA); this

allows the ambient temperature to be representative of

the internal junction temperature.

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 cop-

per area being dedicated for heat spreading, a multi-

layer board construction using only the minimum size

pad layout will typically provide the CM3001 with an

overall θJA of 70°C/W, which allows up to 0.8W to be

dissipated safely.

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Output Voltage with temperature (5mA Load)

1.38

1.36

1.34

1.32

1.30

1.28

1.26

1.24

1.22

-50

0

50

100

150

Temperature [oC]

Output Voltage with temperature (500mA Load)

1.35

1.34

1.33

1.32

1.31

1.30

1.29

1.28

1.27

1.26

1.25

-50 -25

0

25 50 75

Temperature [oC]

Ground Current with Temperature (No Load)

700

600

500

400

300

200

100

0

-50

0

50

100

150

Temperature [oC]

)LJXUH  

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‹ 2002 California Micro Devices Corp. All rights reserved.

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215 Topaz Street, Milpitas, California 95035 L Tel: (408) 263-3214 L Fax: (408) 263-7846 L www.calmicro.com 01/24/02

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