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ADP122AUJZ-2.8-R7 Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer ADP122AUJZ-2.8-R7
Bauteilbeschribung  5.5 V Input, 300 mA, Low Quiescent Current, CMOS Linear Regulator
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Direct Link  http://www.analog.com
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ADP122AUJZ-2.8-R7 Datenblatt(HTML) 1 Page - Analog Devices

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5.5 V Input, 300 mA, Low Quiescent
Current, CMOS Linear Regulator
Data Sheet
ADP122/ADP123
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2009–2012 Analog Devices, Inc. All rights reserved.
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 packages: 5-lead TSOT and 6-lead 2 mm × 2 mm LFCSP
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
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.
The ADP122 is capable of 31 fixed output voltages from 1.75 V
to 3.3 V. The ADP123 is the adjustable version of the device and
allows the output voltage to be set between 0.8 V and 5.0 V by
an external voltage divider.
The ADP122/ADP123 are specifically designed for stable operation
with tiny 1 µF ceramic input and output capacitors to meet the
requirements of high performance, space constrained applications.
TYPICAL APPLICATION CIRCUITS
2
3
1
4
5
VIN = 2.3V TO 5.5V
VOUT = 1.8V
VIN
GND
EN
VOUT
NC
CIN
1µF
COUT
1µF
ADP122
OFF
ON
Figure 1. ADP122 with Fixed Output Voltage (TSOT Version)
VIN = 2.3V TO 5.5V
VOUT = 0.5V(1 + R1/R2)
R1
R2
CIN
1µF
COUT
1µF
2
3
1
4
5
VIN
GND
EN
VOUT
ADJ
ADP123
OFF
ON
Figure 2. ADP123 with Adjustable Output Voltage (TSOT Version)
NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
OR CONNECTED TO GROUND.
TOP VIEW
(Not to Scale)
ADP122
3
GND
1
VOUT
2
NC
4
EN
6 VIN = 2.3V TO 5.5V
VOUT = 1.8V
C1
1µF
GND
ON
OFF
VIN
5
NC
C2
1µF
GND
GND
Figure 3. ADP122 with Fixed Output Voltage (LFCSP Version)
NC = NOT CONNECT. THIS PIN CAN BE LEFT FLOATING
OR CONNECTED TO GROUND.
TOP VIEW
(Not to Scale)
ADP123
3
GND
1
VOUT
2
ADJ
4
EN
6 VIN = 2.3V TO 5.5V
VOUT = 0.5V (1 + R1/R2)
C1
1µF
GND
ON
OFF
VIN
5
NC
C2
1µF
R1
R2
GND
GND
GND
Figure 4. ADP123 with Adjustable Output Voltage (LFCSP Version)
The ADP122/ADP123 have an internal soft start that gives a
constant start-up time of 350 µs. Short-circuit protection and
thermal overload protection circuits prevent damage in adverse
conditions. The ADP122/ADP123 are available in a tiny, 5-lead
TSOT package and 6-lead LFCSP package for the smallest
footprint solution to meet a variety of portable applications.


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