Datasheet

ADP1720
Rev. A | Page 9 of 16
–100
10 10M
PSRR (dB)
0
FREQUENCY (Hz)
100 1k 10k 100k 1M
V
IN
= 8V
V
OUT
= 5V
C
OUT
= 1µF
V
RIPPLE
= 50mV
–10
–20
–30
–40
–50
–60
–70
–80
–90
1mA
10mA
100µA
06111-015
Figure 15. Power Supply Rejection Ratio vs. Frequency
(5.0 V Fixed Output)
TIME (20µs/DIV)
10mV/DI
V
1
V
IN
= 12V
V
OUT
= 1.6V
C
IN
= 1µF
C
OUT
= 1µF
LOAD STEP FROM 2.5mA TO 47.5mA
06111-016
V
OUT
Figure 16. Load Transient Response
TIME (100µs/DIV)
10mV/DI
V
2
2V/DI
V
1
V
OUT
= 5V
C
IN
= 1µF
C
OUT
= 1µF
I
LOAD
= 50mA
06111-017
V
IN
STEP FROM 6V TO 7V
V
OUT
Figure 17. Line Transient Response
TIME (40µs/DIV)
2V/DI
V
2
5V/DI
V
1
V
IN
= 12V
V
OUT
= 5V
C
IN
= 1µF
C
OUT
= 1µF
I
LOAD
= 50mA
06111-018
EN
V
OUT
Figure 18. Start-Up Time