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ADP122 View Datasheet(PDF) - Analog Devices

Part NameADP122 ADI
Analog Devices ADI
Description5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator


ADP122 Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
ADP122/ADP123
0.50
0.45
0.40
0.35
0.30
0.25
0.20
VIN = 3.6V
VIN = 3.8V
VIN = 4.2V
VIN = 4.4V
VIN = 5.0V
VIN = 5.2V
VIN = 5.4V
VIN = 5.5V
0.15
0.10
–50 –25
0
25
50
75
TEMPERATURE (°C)
100 125
Figure 11. Shutdown Current vs. Temperature at Various Input Voltages
70
60
50
40
30
20
10
0
1
10
100
1000
IOUT (mA)
Figure 12. Dropout Voltage vs. Load Current
450
400
350
300
250
200
150
100
IOUT = 10mA
IOUT = 100mA
50
IOUT = 150mA
IOUT = 300mA
0
3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45
VIN (V)
Figure 13. Ground Current vs. Input Voltage (in Dropout)
3.35
3.30
3.25
3.20
IOUT = 10mA
IOUT = 100mA
IOUT = 150mA
IOUT = 300mA
3.15
3.10
3.05
3.00
3.05 3.10 3.15 3.20 3.25 3.30
VIN (V)
3.35 3.40
Figure 14. Output Voltage vs. Input Voltage (in Dropout)
–10
–20
IOUT = 100µA
–30
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 15. Power Supply Rejection Ratio vs. Frequency, VOUT = 2.8 V, VIN = 3.3 V
–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
FREQUENCY (Hz)
10M
Figure 16. Power Supply Rejection Ratio vs. Frequency, VOUT = 3.3 V, VIN = 3.8 V
Rev. 0 | Page 8 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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