ADP172ACBZ-2.1-R7 datasheet(9/20 Pages) AD

Part #	ADP172ACBZ-2.1-R7

Description	300 mA, Low Quiescent Current, CMOS Linear Regulator

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ADP172

Rev. 0 | Page 9 of 20

10

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

–30

–40

–50

–60

–70

–80

–90

300mA

200mA

100mA

10mA

1mA

Figure 15. Power Supply Rejection Ratio vs. Frequency, VOUT = 3.0 V

10

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

–30

–40

–50

–60

–70

–80

–90

3V, 1mA

1.8V, 1mA

0.8V, 1mA

3V, 300mA

1.8V, 300mA

0.8V, 300mA

Figure 16. Power Supply Rejection Ratio vs. Frequency, Various Output

Voltages and Load Currents

0.01

0.1

1

10

100

1k

10k

100k

FREQUENCY (Hz)

0.8V

VIN = 3.6V

ILOAD = 10mA

COUT = 1µF

1.8V

3.0V

Figure 17. Output Noise Spectrum

0

10

20

30

40

50

60

70

0.001

0.01

0.1

1

10

100

1000

LOAD CURRENT (mA)

3V

1.8V

0.8V

Figure 18. RMS Noise vs. Load Current and Output Voltage

CH1 200mA Ω

CH2 50.0mV

B

W M40.00µs A CH1

124mA

1

2

T

160.680µs

ILOAD

VOUT

VIN = 3.6V

VOUT = 1.8V

1mA TO 300mA LOAD STEP,

2.5A/µs

Figure 19. Load Transient Response, CIN and COUT = 1 μF

CH1 200mA Ω

CH2 50.0mV

B

W M40.0µs

A CH1

204mA

1

2

T

159.800µs

ILOAD

VOUT

VIN = 3.6V

VOUT = 1.8V

1mA TO 300mA LOAD STEP,

2.5A/µs

Figure 20. Load Transient Response, CIN and COUT = 4.7 μF

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ADP172ACBZ-2.1-R7 Datasheet(PDF) 9 Page - Analog Devices

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