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ADP222ACPZ-1827-R7 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części ADP222ACPZ-1827-R7
Szczegółowy opis  Dual, 300 mA Output, Low Noise
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Strona internetowa  http://www.analog.com
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Dual, 300 mA Output, Low Noise,
High PSRR Voltage Regulators
Data Sheet
ADP222/ADP223/ADP224/ADP225
Rev. B
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
©2011 Analog Devices, Inc. All rights reserved.
FEATURES
Input voltage range: 2.5 V to 5.5 V
Small, 8-lead, 2 mm × 2 mm LFCSP package
Initial accuracy: ±1%
High PSRR: 70 dB at 10 kHz, 60 dB at 100 kHz, 40 dB at 1 MHz
Low noise: 27 µV rms at VOUT = 1.2 V, 50 µV rms at VOUT = 2.8 V
Excellent transient response
Low dropout voltage: 170 mV at 300 mA load
65 µA typical ground current at no load, both LDOs enabled
Fixed output voltage from 0.8 V to 3.3 V (ADP222/ADP224)
Adjustable output voltage range from 0.5 V to 5.0 V
(ADP223/ADP225)
Quick output discharge (QOD)—ADP224/ADP225
Overcurrent and thermal protection
APPLICATIONS
Portable and battery-powered equipment
Portable medical devices
Post dc-to-dc regulation
Point of sale terminals
Credit card readers
Automatic meter readers
Wireless network equipment
TYPICAL APPLICATION CIRCUITS
EN1
VOUT1
VIN
EN2
GND
6
4
3
2
ADJ2
VOUT2
1
8
5
7
ADJ1
ADP223/
ADP225
R1
R4
R2
ON
OFF
ON
OFF
VIN = 4.2V
+ C1
1µF
+ C3
1µF
+ C2
1µF
VOUT1 = 2.8V
VOUT2 = 2.0V
R3
Figure 1. ADP223/ADP225
EN1
VOUT1
VIN
EN2
GND
6
4
3
2
SENSE2
VOUT2
1
8
5
7
SENSE1
ADP222/
ADP224
ON
OFF
ON
OFF
VIN = 4.2V
+ C1
1µF
+ C3
1µF
+ C2
1µF
VOUT2 = 3.3V
VOUT1 = 1.5V
Figure 2. ADP222/ADP224
GENERAL DESCRIPTION
The 300 mA, adjustable dual output ADP223/ADP225 and
fixed dual output ADP222/ADP224 combine high PSRR, low
noise, low quiescent current, and low dropout voltage in a
voltage regulator that is ideally suited for wireless applications
with demanding performance and board space requirements.
The ADP222/ADP224 are available with fixed outputs voltages
from 0.8V to 3.3V. The adjustable output ADP223/ADP225 may
be set to output voltages from 0.5 V to 5.0 V. The low quiescent
current, low dropout voltage, and wide input voltage range of
the ADP222/ADP223/ADP224/ADP225 extend the battery life
of portable devices.
The ADP222/ADP223/ADP224/ADP225 maintain power
supply rejection greater than 60 dB for frequencies as high as
100 kHz while operating with a low headroom voltage. The
ADP222/ADP223/ADP224/ADP225 offer much lower noise
performance than competing LDOs without the need for a
noise bypass capacitor. Overcurrent and thermal protection
circuitry prevent damage in adverse conditions.
The ADP224 and ADP225 are identical to the ADP222 and
ADP223, respectively, but with the addition of a quick output
discharge (QOD) feature.
The ADP222/ADP223/ADP224/ADP225 are available in a
small 8-lead, 2 mm × 2 mm LFCSP package and are stable with
tiny 1 µF, ±30% ceramic output capacitors, resulting in the smallest
possible board area for a wide variety of portable power needs.


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