ADP172 Analog Devices, Inc., ADP172 Datasheet - Page 9

• Manufacturer Part Number: ADP172
• Description: 300 Ma, Low Quiescent Current, Cmos Linear Regulator
• Manufacturer: Analog Devices, Inc.

Figure 16. Power Supply Rejection Ratio vs. Frequency, Various Output
Figure 15. Power Supply Rejection Ratio vs. Frequency, V
0.01
0.1
10
–30
–40
–50
–60
–70
–80
–90
–30
–40
–50
–60
–70
–80
–90
1
10
10
10
V
I
C
LOAD
3V, 1mA
1.8V, 1mA
0.8V, 1mA
3V, 300mA
1.8V, 300mA
0.8V, 300mA
IN
OUT
300mA
200mA
100mA
10mA
1mA
0.8V
1.8V
3.0V
= 3.6V
100
100
= 1µF
= 10mA
Figure 17. Output Noise Spectrum
100
Voltages and Load Currents
1k
1k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
1k
10k
10k
100k
100k
10k
1M
1M
OUT
= 3.0 V
100k
10M
10M
Rev. A | Page 9 of 20
1
2
70
60
50
40
30
20
10
1
2
0.001
0
Figure 18. RMS Noise vs. Load Current and Output Voltage
CH1
Figure 20. Load Transient Response, C
CH1
Figure 19. Load Transient Response, C
200mA Ω
200mA Ω
0.01
1mA TO 300mA LOAD STEP,
CH2 50.0mV
1mA TO 300mA LOAD STEP,
CH2 50.0mV
0.1
LOAD CURRENT (mA)
2.5A/µs
2.5A/µs
I
LOAD
I
LOAD
V
V
OUT
OUT
B
B
1
W
W
1.8V
0.8V
3V
M40.00µs A CH1
M40.0µs
T
T
159.800µs
160.680µs
10
IN
IN
and C
and C
A CH1
V
V
V
V
IN
OUT
IN
OUT
OUT
OUT
100
= 3.6V
= 3.6V
= 1.8V
= 4.7 μF
= 1.8V
= 1 μF
204mA
124mA
ADP172
1000