CMPWR160SAR 데이터 시트보기 (PDF) - California Micro Devices Corp
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CMPWR160SAR Datasheet PDF : 10 Pages
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CALIFORNIA MICRO DEVICES
CMPWR160
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
VCC supply voltage of 5V DC, unless specified otherwise.
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 VCC power-up and power-down characterizations
VCC supply was ramped between 0 and 5V. Both the rise
and fall times for the VCC power-up/down pulses were
controlled to be 15ms.
In the line transient characterizations the VCC supply
voltage was controlled to step between 4.5 to 5.5V.
For the POR response characterization VCC and SD were
tied to ground and the VOUT voltage was directly driven
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 VOUT
directly across the typical POR threshold voltage of 2.9V.
VCC was tied to ground to show that the POR circuitry will
operate even when the VCC supply voltage is not present.
The oscilloscope traces show the full bandwidth re-
sponse at the SD , POR, VCC and VOUT pins depending on
the characterization.
VCC + C1
10µF
C2
0.1µF
GND
CMPWR160
VCC
POR
SD
VOUT
GND
+ C3
0.1µF
C4
10µF
POR
VOUT
(500mA)
6.6Ω
GND
Figure 6. Transient Characterization Test Setup
VCC power-up Cold Start
Figure 7 shows the output response during an initial V
CC
power up with SD tied to VCC. When VCC reaches a
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 VOUT rises. Once this voltage rises to just
below VCC the inrush current stops flowing and the output
rises with the input. VOUT continues to rise with the input
until it reaches 3.3V.
Tek Run 25.0kS/s Sample
VCC
VOUT
(500mA Load)
1.00V Ch2 1.00V M 2.00ms Ch2 280mV
Figure 7. VCC Power-up Cold Start
©2000 California Micro Devices Corp. All rights reserved. SmartOR™ is a trademark of California Micro Devices Corporation.
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
6
12/5/2000
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