CM3001 Datasheet, PDF (6/7 Pages) California Micro Devices Corp – Micropower 500mA Low Voltage CMOS Regulator

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T_JUNC = T_AMB + P_D ∗ (θ_JC) + P_D ∗ (θ_CA)
= T_AMB + P_D ∗ (θ_JA)
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UHVXOWLQJ θ_JA LV DERXW 0°C/W
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:
T_JUNC = T_AMB + P_D ∗ (θ_JA)
= 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 θ_JA 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.
6
215 Topaz Street, Milpitas, California 95035 L Tel: [phone] L Fax: [phone] L www.calmicro.com 01/24/02