ADP123 Analog Devices, ADP123 Datasheet - Page 9

• Manufacturer Part Number: ADP123
• Description: 5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator, Adjustable Output Voltage
• Manufacturer: Analog Devices

Figure 23. Power Supply Rejection Ratio vs. Headroom Voltage (V
Figure 21. Power Supply Rejection Ratio vs. Frequency, V
Figure 22. Power Supply Rejection Ratio vs. Frequency, Various Output
–100
–100
–100
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
–10
–20
–30
–40
–50
–60
–70
–80
–90
10
10
10
V
V
V
V
V
V
V
V
I
I
I
I
I
I
V
V
V
V
V
V
IN
IN
IN
IN
IN
IN
IN
IN
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
V
V
C
= 3.1V, I
= 3.3V, I
= 3.8V, I
= 4.8V, I
= 3.1V, I
= 3.3V, I
= 3.8V, I
= 4.8V, I
V
V
C
V
C
IN
RIPPLE
IN
IN
RIPPLE
IN
100
100
100
RIPPLE
= 100µA
= 1mA
= 10mA
= 100mA
= 200mA
= 300mA
IN
= V
= 2.8V, I
= 3.3V, I
= 4.2V, I
= 2.8V, I
= 3.3V, I
= 4.2V, I
= C
= V
= C
= C
Voltages and Load Currents
OUT
OUT
OUT
OUT
= 50mV
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
= 50mV
= 50mV
+ 0.5V
1µF
OUT
OUT
OUT
OUT
OUT
OUT
+ 0.5V
1µF
= 1mA
= 1mA
= 1mA
= 1mA
= 300mA
= 300mA
= 300mA
= 300mA
1µF
1k
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
= 1mA
= 1mA
= 1mA
= 300mA
= 300mA
= 300mA
10k
10k
10k
100k
100k
100k
OUT
= 4.2 V, V
1M
1M
1M
IN
IN
10M
= 4.7 V
10M
10M
− V
OUT
Rev. A | Page 9 of 24
)
1
2
Figure 25 Output Noise vs. Load Current and Output Voltage
70
65
60
55
50
45
40
35
30
5
4
3
2
1
0
0.001
10
CH1
200mA Ω
V
Figure 26. Load Transient Response, C
OUT
0.01
= 2.8V
1mA TO 300mA LOAD STEP
Figure 24. Output Noise Spectrum
V
B
100
OUT
W
V
CH2 50.0mV
OUT
= 4.2V
0.1
= 3.3V
FREQUENCY (Hz)
V
V
V
OUT
OUT
OUT
V
I
OUT
OUT
I
OUT
= 4.2V
= 3.3V
= 2.8V
1k
B
1
(mA)
W
M 40.0µs A CH1
T
ADP122/ADP123
10.20%
10
10k
OUT
V
V
IN
OUT
= 1 μF
= 3.7V
100
= 3.3V
196mA
1000
100k