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ADP122AUJZ-3.3-R7 View Datasheet(PDF) - Analog Devices

Part NameADP122AUJZ-3.3-R7 ADI
Analog Devices ADI
Description5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
ADP122AUJZ-3.3-R7 Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
–10
–20
–30
IOUT = 100µA
IOUT = 1mA
IOUT = 10mA
–40
IOUT = 100mA
IOUT = 200mA
–50
IOUT = 300mA
–60
–70
–80
VIN = VOUT + 0.5V
–90
VRIPPLE = 50mV
CIN = COUT 1µF
–100
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 17. Power Supply Rejection Ratio vs. Frequency, VOUT = 4.2 V, VIN = 4.7 V
–10
–20
VOUT = 2.8V, IOUT = 1mA
–30
VOUT = 3.3V, IOUT = 1mA
VOUT = 4.2V, IOUT = 1mA
–40
VOUT = 2.8V, IOUT = 300mA
VOUT = 3.3V, IOUT = 300mA
–50
VOUT = 4.2V, IOUT = 300mA
–60
–70
–80
VIN = VOUT + 0.5V
VRIPPLE = 50mV
–90
CIN = COUT 1µF
–100
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 18. Power Supply Rejection Ratio vs. Frequency, Various Output
Voltages and Load Currents
–10
VIN = 3.1V, IOUT = 1mA
–20
VIN = 3.3V, IOUT = 1mA
VIN = 3.8V, IOUT = 1mA
VIN = 4.8V, IOUT = 1mA
–30
VIN = 3.1V, IOUT = 300mA
VIN = 3.3V, IOUT = 300mA
–40
VIN = 3.8V, IOUT = 300mA
VIN = 4.8V, IOUT = 300mA
–50
–60
–70
–80
VRIPPLE = 50mV
CIN = COUT 1µF
–90
–100
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
Figure 19. Power Supply Rejection Ratio vs. Headroom Voltage (VIN − VOUT)
ADP122/ADP123
5
VOUT = 4.2V
4
VOUT = 3.3V
3
2
1
VOUT = 2.8V
0
10
100
1k
10k
FREQUENCY (Hz)
Figure 20. Output Noise Spectrum
100k
70
65
VOUT = 4.2V
60
VOUT = 3.3V
55
50
45
VOUT = 2.8V
40
35
30
0.001
0.01
0.1
1
10
IOUT (mA)
100
1000
Figure 21 Output Noise vs. Load Current and Output Voltage
IOUT
1mA TO 300mA LOAD STEP
1
2
VOUT
VIN = 3.7V
VOUT = 3.3V
CH1
200mA
B
W
CH2
50.0mV
B
W
M 40.0µs
A CH1
196mA
T 10.20%
Figure 22. Load Transient Response, COUT = 1 μF
Rev. 0 | Page 9 of 20
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GENERAL DESCRIPTION
The ADP122/ADP123 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 300 mA of output current. The low 85 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range.
The low 170 μA of quiescent current at full load makes the ADP122 ideal for battery-operated portable equipment.

FEATURES
Input voltage supply range: 2.3 V to 5.5 V
300 mA maximum output current
Fixed and adjustable output voltage versions
Very low dropout voltage: 85 mV at 300 mA load
Low quiescent current: 45 μA at no load
Low shutdown current: <1 μA
Initial accuracy: ±1% accuracy
Up to 31 fixed-output voltage options available from 1.75 V to 3.3 V
Adjustable-output voltage range 0.8 V to 5.0 V (ADP123)
Excellent PSRR performance: 60 dB at 100 kHz
Excellent load/line transient response
Optimized for small 1.0 μF ceramic capacitors
Current limit and thermal overload protection
Logic controlled enable
Compact, 5-lead TSOT package

APPLICATIONS
Digital camera and audio devices
Portable and battery-powered equipment
Automatic meter reading (AMR) meters
GPS and location management units
Medical instrumentation
Point-of-sale equipment

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