CMPWR160SA CALMIRCO [California Micro Devices Corp], CMPWR160SA Datasheet - Page 8

• 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.
8
Typical Transient Characteristics
Load Step response
Figure 11 shows the output voltage (Ch1) response of
the regulator during a step load change between 5mA
and 500mA (represented on Ch2). For the 5mA to
500mA transition an initial transient overshoot of 60mV
occurs and then the output settles to its final voltage
within 20µs. For the 500mA to 5mA transition there is
also an initial overshoot of 60mV however it takes
approximately 250µs to settle to its final voltage.
The overall DC voltage disturbance on the output is
approximately 25mV, which demonstrates the regulator
output impedance of 50mΩ.
V
Line Step Response
Figure 12 shows the output response of the regulator to
a V
(1Vpp as shown on Ch2). 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.
V
Reset response time with overdrive
Figure 13 shows the time it takes for the
reset when the output voltage is driven below the
trigger threshold by varying amounts. The amount the
voltage is driven below the POR trigger threshold is the
overdrive voltage.
OUT
OUT
215 Topaz Street, Milpitas, California 95035 
CC
CALIFORNIA MICRO DEVICES
offset = 3.3V
offset = 3.3V
line voltage transient between 4.5V and 5.5V
continued
POR
signal to
Tel: [phone]
POR
Figure 13. Reset Response Time with Overdrive
Tek Run
1
Tek
2
1000
Ch1
100
10
1
Load
4.5V
V CC
0
Figure 11. Load Step Response
5mA
Figure 12. Line Step Response
50.0mV
250kS/s
20.0mV Ch2
Fax: [phone]
250kS/s
50
VOUT (offset = 3.3V)
V OUT(offset = 3.3V)
5.5V
Sample
500mA
100
2.00V
500mV
(5mA Load)
Overdrive (mV)
2 Acqs
150
M 200µs
M 200µs
200
www.calmicro.com
Ch2
Ch2
CMPWR160
250
1.60V
5.00V
300
12/5/2000