CMPWR160SA CALMIRCO [California Micro Devices Corp], CMPWR160SA Datasheet - Page 6

• Manufacturer Part Number: CMPWR160SA
• Description: USB peripheral Power Management
• Manufacturer: CALMIRCO [California Micro Devices Corp]

©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
6
Typical Transient Characteristics
The transient characterization test setup is shown in
Figure 6. It was the setup used for the transient tests
unless specified otherwise.
A maximum rated load current of 6.6Ω (500mA @ 3.3V)
was used during characterization along with a nominal
V
The load transient characterization was done by switch-
ing between 6.6 and 660Ω load resistors. This switched
the load between 500 and 5mA respectively.
For the V
V
and fall times for the V
controlled to be 15ms.
V
Figure 7 shows the output response during an initial V
power up with
particular threshold, the regulator turns on. The un-
charged output capacitor causes maximum inrush
current to flow. At this point the device sees the output
as a short circuit and the device enters a protective
current limiting mode. The output capacitor quickly
charges and V
below V
rises with the input. V
until it reaches 3.3V.
CC
CC
CC
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CALIFORNIA MICRO DEVICES
supply was ramped between 0 and 5V. Both the rise
supply voltage of 5V DC, unless specified otherwise.
power-up Cold Start
CC
CC
the inrush current stops flowing and the output
power-up and power-down characterizations
SD
OUT
V
CC
rises. Once this voltage rises to just
tied to V
GND
OUT
CC
+
power-up/down pulses were
continues to rise with the input
C1
10µF
CC
. When V
Figure 6. Transient Characterization Test Setup
C2
0.1µF
CC
reaches a
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V
SD
CMPWR160
CC
CC
GND
V
POR
In the line transient characterizations the V
voltage was controlled to step between 4.5 to 5.5V.
For the
tied to ground and the V
between 2.7 and 3.1V. This was done by connecting a
function generator directly to the output of the device.
These voltage values were picked because it drove V
directly across the typical
V
operate even when the V
The oscilloscope traces show the full bandwidth re-
sponse at the
the characterization.
OUT
CC
was tied to ground to show that the
Tek Run
+
POR
Figure 7. V
C3
0.1µF
1.00V
25.0kS/s
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response characterization V
SD
,
POR
Ch2 1.00V
C4
10µF
Sample
CC
, V
OUT
Power-up Cold Start
V CC
V OUT
CC
POR
CC
voltage was directly driven
supply voltage is not present.
and V
M 2.00ms
(500mA)
6.6Ω
threshold voltage of 2.9V.
OUT
(500mA Load)
pins depending on
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Ch2
GND
CMPWR160
POR
POR
V
CC
OUT
CC
and
supply
280mV
circuitry will
SD
were
OUT
12/5/2000