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Analog Devices - (ADP322 / ADP323) High PSRR Voltage Regulator

Numéro de référence ADP322
Description (ADP322 / ADP323) High PSRR Voltage Regulator
Fabricant Analog Devices 
Logo Analog Devices 





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ADP322 fiche technique
FEATURES
Fixed (ADP322) and adjustable output (ADP323) options
Bias voltage range (VBIAS): 2.5 V to 5.5 V
LDO input voltage range (VIN1/VIN2, VIN3): 1.8 V to 5.5 V
Three 200 mA low dropout voltage regulators (LDOs)
16-lead, 3 mm × 3 mm LFCSP
Initial accuracy: ±1%
Stable with 1 µF ceramic output capacitors
No noise bypass capacitor required
3 independent logic controlled enables
Overcurrent and thermal protection
Key specifications
High PSRR
76 dB PSRR up to 1 kHz
70 dB PSRR at 10 kHz
60 dB PSRR at 100 kHz
40 dB PSRR at 1 MHz
Low output noise
29 µV rms typical output noise at VOUT = 1.2 V
55 µV rms typical output noise at VOUT = 2.8 V
Excellent transient response
Low dropout voltage: 110 mV at 200 mA load
85 µA typical ground current at no load, all LDOs enabled
100 µs fast turn-on circuit
Guaranteed 200 mA output current per regulator
−40°C to +125°C junction temperature
APPLICATIONS
Mobile phones
Digital cameras and audio devices
Portable and battery-powered equipment
Portable medical devices
Post dc-to-dc regulation
GENERAL DESCRIPTION
The ADP322/ADP323 200 mA triple output LDOs combine high
PSRR, low noise, low quiescent current, and low dropout voltage
to extend the battery life of portable devices and are ideally
suited for wireless applications with demanding performance
and board space requirements.
The ADP322/ADP323 PSRR is greater than 60 dB for frequencies
www.DasahtaigShheaest140U0.ckoHmz while operating with a low headroom voltage.
The ADP322/ADP323 offer much lower noise performance
than competing LDOs without the need for a noise bypass
capacitor.
Rev. 0
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.
Triple, 200 mA, Low Noise,
High PSRR Voltage Regulator
ADP322/ADP323
TYPICAL APPLICATION CIRCUITS
2.5V TO VBIAS
5.5V
+
1µF
ADP322 VBIAS
1.8V TO VIN1/VIN2
5.5V
+
1µF ON
EN1
OFF
LDO 1
EN LD1
VBIAS
VOUT1
+
1µF
1.8V TO VIN3
5.5V
ON
EN2
OFF
+
1µF ON
EN3
OFF
LDO 2
EN LD2
VBIAS
LDO 3
EN LD3
VOUT2
+
1µF
VOUT3
+
1µF
GND
Figure 1. Typical Application Circuit for ADP322
2.5V TO VBIAS
5.5V
+
1µF
ADP323 VBIAS
1.8V TO VIN1/VIN2
5.5V
+
1µF ON
EN1
OFF
LDO 1
EN LD1
VBIAS
1.8V TO VIN3
5.5V
ON
EN2
OFF
+
1µF ON
EN3
OFF
LDO 2
EN LD2
VBIAS
LDO 3
EN LD3
VOUT1
FB1
+
1µF
VOUT2
FB2
+
1µF
VOUT3
FB3
+
1µF
GND
Figure 2. Typical Application Circuit for ADP323
The ADP322/ADP323 are available in a miniature 16-lead,
3 mm × 3 mm LFCSP package and are stable with tiny 1 µF
±30% ceramic output capacitors providing the smallest possible
board area for a wide variety of portable power needs.
The ADP322 is available in output voltage combinations ranging
from 0.8 V to 3.3 V and offers overcurrent and thermal protection
to prevent damage in adverse conditions. The APDP323
adjustable triple LDO can be configured for any output voltage
between 0.5 V and 5 V with two resistors for each output.
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
©2010 Analog Devices, Inc. All rights reserved.

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