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CMPWR160SA Datasheet(PDF) 7 Page - California Micro Devices Corp

Part # CMPWR160SA
Description  USB peripheral Power Management
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Manufacturer  CALMIRCO [California Micro Devices Corp]
Direct Link  http://www.calmicro.com
Logo CALMIRCO - California Micro Devices Corp

CMPWR160SA Datasheet(HTML) 7 Page - California Micro Devices Corp

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CALIFORNIA MICRO DEVICES
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
12/5/2000
7
215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
CMPWR160
Typical Transient Characteristics continued
V
CC Power down
Figure 8 shows the output response of the regulator
during a complete power down situation under full load
conditions with SD tied to V
CC.
Figure 8. V
CC Power Down
Shutdown Transient Response
The transient response of the output voltage to the SD
pin is shown in Figure 9. The graph shows that a rising
edge on the SD pin enables the regulator and a falling
edge disables the regulator.
The rise and fall time for the output voltages are 100µs
and 200µs respectively.
Figure 9. Shutdown Transient Response
3.50V
(500mA Load)
VCC
VOUT
M 2.00ms
1.00V
Ch2 1.00V
25.0kS/s
Tek Run
Sample
Ch2
3.0V
(500mA Load)
SD
M 200µs
1.00V
Ch2
2
5.00V
25.0kS/s
Tek
3 Acqs
Ch2
VOUT
POR
Response
The transient response of the active low POR pin to V
OUT
is shown in Figure 10. When V
OUT rises above the
POR threshold voltage (typically 2.9V), the pin is forced
to logic low (0V). The pin remains at logic low for 30ms
then it is forced to logic high (3.3V). If V
OUT falls below the
POR threshold voltage during this 30ms interval POR
will remain logic low. If it falls below the voltage threshold
and then recovers the 30ms time will reset.
When V
OUT falls below the
POR threshold voltage POR is
immediately forced to logic low.
V
CC is tied to ground to show that the POR circuitry will
work without V
CC present.
2.90V
POR
M 10.0ms
1.00V
Ch2
2
200mV
5.0kS/s
Tek Run
Sample
Ch2
VOUT
2.7V
3.1V
Figure 10. POR Response


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