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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
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
VIN 1
5 VOUT
ADP122
GND 2 TOP VIEW
(Not to Scale)
EN 3
4 NC
NC = NO CONNECT
Figure 3. ADP122 Fixed Output Pin Configuration
VIN 1
5 VOUT
ADP123
GND 2 TOP VIEW
(Not to Scale)
EN 3
4 ADJ
Figure 4. ADP123 Adjustable Output Pin Configuration
Table 5. Pin Function Descriptions
Pin No.
ADP122 ADP123 Mnemonic Description
1
1
VIN
Regulator Input Supply. Bypass VIN to GND with a capacitor of at least 1 μF.
2
2
GND
Ground.
3
3
EN
Enable Input. Drive EN high to turn on the regulator; drive EN low to turn off the regulator. For
automatic startup, connect EN to VIN.
N/A
4
ADJ
Output Voltage Adjust Input. Connect the midpoint of an external divider from VOUT to GND to this
pin to set the output voltage.
4
N/A
NC
Not Connected Internally.
5
5
VOUT
Regulated Output Voltage. Bypass VOUT to GND with a capacitor of at least 1 μF.
Rev. 0 | Page 6 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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