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CMPWR150TOT Datasheet(PDF) 7 Page - California Micro Devices Corp

Part # CMPWR150TOT
Description  500mA/3.3V SMARTOR Power Regulator
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CMPWR150TOT Datasheet(HTML) 7 Page - California Micro Devices Corp

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© 1999 California Micro Devices Corp. All rights reserved.
9/99
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
7
CMPWR150
CALIFORNIA MICRO DEVICES
VCC Power-down (VAUX = 0V). Figure 9 shows the
output response of the regulator during a complete
power-down situation under full load conditions.
Once VCC falls below an acceptable logic supply level
(2V), a disturbance on the Drive pin can be observed.
Drive offset = 5.0V
Load Step Response. Figure 10 shows the output
response of the regulator during a step load change from
5mA to 500mA (represented on Ch1). An initial transient
overshoot of 50mV occurs and the output settles to its
final voltage within a few microseconds. The dc voltage
disturbance on the output is approximately 75mV, which
demonstrates the regulator output impedance of 0.15Ω.
VOUT offset = 3.3V
Typical Transient Characteristics (continued)
Figure 9. VCC Power-down (VAUX = 0V).
Figure 10. Load Step Response.
Typical Thermal Characteristics
Thermal dissipation of junction heat consists primarily of
two paths in series. The first path is the junction to the case
JC) thermal resistance, which is defined by the package
style, and the second path is the case to ambient (θCA) thermal
resistance, which is dependent on board layout.
For a given package style and board layout, the operating
junction temperature is a function of junction power
dissipation PJUNC and the ambient temperature, resulting in
the following thermal equation:
TJUNC = TAMB + PJUNC JC ) + PJUNC CA)
The TO-263 style package has θJC of 3°C/W and when
mounted, using minimum pad layout with tab soldered
down, produces a θCA of 48°C/W. Based on maximum power
dissipation of 1.0W (2Vx500mA) with an ambient of 70°C
the resulting junction temperature will be:
TJUNC = TAMB + PJUNC JC ) + PJUNC CA)
= 70°C + 1.0W (3°C/W) + 1.0W (48°C/W)
= 70°C + 3.0°C + 48°C
= 121°C
Figure 11. Line Step Response.
Line Step Response. Figure 11 shows the output response
of the regulator to a VCC line voltage transient between 4.5V
and 5.5V (1Vpp as shown on Ch1). The load condition during
this test is 5mA. The output response produces less than
10mV of disturbance on both edges indicating a line rejection
of better than 40dB at high frequencies.
VOUT offset = 3.3V


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