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Analog Devices Semiconductor Electronic Components Datasheet

ADP224 Datasheet

High PSRR Voltage Regulators

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ADP224 pdf
Data Sheet
Dual, 300 mA Output, Low Noise,
High PSRR Voltage Regulators
ADP222/ADP223/ADP224/ADP225
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
VIN = 4.2V
+ C1
1µF
R2
ON
OFF
ON
OFF
1 EN1
ADJ1 8
ADP223/
ADP225
2 EN2
VOUT1 7
3 GND
VIN 6
R1
VOUT2 = 2.0V
+ C2
1µF
4 ADJ2
VOUT2 5
VOUT1 = 2.8V
R3 + C3
1µF
R4
VIN = 4.2V
+ C1
1µF
ON
OFF
ON
OFF
Figure 1. ADP223/ADP225
1 EN1
SENSE1 8
ADP222/
ADP224
2 EN2
VOUT1 7
3 GND
VIN 6
4 SENSE2 VOUT2 5
VOUT1 = 1.5V
+ C2
1µF
VOUT2 = 3.3V
+ C3
1µF
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
Figure 2. ADP222/ADP224
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.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. 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.


Analog Devices Semiconductor Electronic Components Datasheet

ADP224 Datasheet

High PSRR Voltage Regulators

No Preview Available !

ADP224 pdf
ADP222/ADP223/ADP224/ADP225
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuits............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Input and Output Capacitor, Recommended Specifications.. 4
Absolute Maximum Ratings............................................................ 5
Thermal Data ................................................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
REVISION HISTORY
8/11—Rev. A to Rev. B
Changes to Features and General Descriptions Sections ............ 1
Added Figure 64; Renumbered Sequentially .............................. 17
Changes to Theory of Operation Section.................................... 17
Changes to Output Capacitor Section ......................................... 18
Changes to Paralleling Outputs to Increase Output
Current Section............................................................................... 19
Updated Outline Dimensions ....................................................... 23
Data Sheet
Typical Performance Characteristics ..............................................7
Theory of Operation ...................................................................... 17
Applications Information .............................................................. 18
Capacitor Selection .................................................................... 18
Enable Feature ............................................................................ 19
Paralleling Outputs to Increase Output Current.................... 19
Quick Output Discharge (QOD) Function ............................ 19
Current Limit and Thermal Overload Protection ................. 20
Thermal Considerations............................................................ 20
Printed Circuit Board Layout Considerations........................ 22
Outline Dimensions ....................................................................... 23
Ordering Guide .......................................................................... 23
7/11—Rev. 0 to Rev. A
Added ADP222, ADP224, and ADP225 .........................Universal
Changes to Features Section, Applications Section,
General Description Section, and Figure 2....................................1
Changes to Table 1.............................................................................3
Added Figure 4; Renumbered Sequentially ...................................6
Changes to Table 5.............................................................................6
Changes to Typical Performance Characteristics Section ...........7
Changes to Theory of Operation Section and Figure 62 .......... 17
Added Figure 63 ............................................................................. 17
Added Quick Output Discharge (QOD) Function Section
Added Figure 70 ............................................................................. 20
2/11—Revision 0: Initial Version
Rev. B | Page 2 of 24


Part Number ADP224
Description High PSRR Voltage Regulators
Maker Analog Devices
Total Page 24 Pages
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