Datasheet

Data Sheet ADP220/ADP221
Rev. H | Page 9 of 20
2.6
2.7 2.8
2.9 3.0 3.1
INPUT VOLTAGE (V)
180
120
140
160
100
80
60
40
20
GROUND CURRENT (µA)
0
I
LOAD
= 1mA
I
LOAD
= 5mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 200mA
07572-016
Figure 16. Ground Current vs. Input Voltage (In Dropout)
10 100 1k
10k 100k 1M
10M
FREQUENCY (Hz)
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
PSRR (dB)
–110
V
RIPPLE
= 50mV
V
IN
= 3.8V
V
OUT
= 2.8V
C
OUT
= 2.2µF
200mA
100mA
10mA
1mA
100µA
07572-017
Figure 17. Power Supply Rejection Ratio vs. Frequency, 2.8 V
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
PSRR (dB)
–100
V
RIPPLE
= 50mV
V
IN
= 4.3V
V
OUT
= 3.3V
C
OUT
= 1µF
200mA
100mA
10mA
1mA
100µA
07572-018
Figure 18. Power Supply Rejection Ratio vs. Frequency, 3.3 V
10
100
1k 10k 100k 1M 10M
FREQUENCY (Hz)
–10
–20
–30
–40
–50
–60
–70
–80
–90
PSRR (dB)
–110
–100
V
RIPPLE
= 50mV
V
IN
= 2.5V
V
OUT
= 0.8V
C
OUT
= 1µF
200mA
100mA
10mA
1mA
100µA
07572-019
Figure 19. Power Supply Rejection Ratio vs. Frequency, 0.8 V
10 100
1k
10k
100k
1M 10M
FREQUENCY (Hz)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
PSRR (dB)
–100
3.3V/200mA 0.8V/200mA
1.8V/200mA
3.3V/100µA 0.8V/100µA
1.8V/100µA
07572-020
Figure 20. Power Supply Rejection Ratio vs. Frequency, at Various Output
Voltages and Load Currents
10 100 1k 10k 100k
FREQUENCY (Hz)
10
0.1
1
OUTPUT NOISE SPECTRUM (µV/ Hz)
0.01
3.3V µV/ Hz
2.8V µV/ Hz
0.8V µV/ Hz
07572-021
Figure 21. Output Noise Spectrum, V
IN
= 5 V, I
LOAD
= 10 mA