Triple, 200 mA, Low Noise,
High PSRR Voltage Regulator
Data Sheet
ADP322/ADP323
FEATURES
TYPICAL APPLICATION CIRCUITS
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
VBIAS
ADP322
VBIAS
2.5V TO
5.5V
+
1µF
VIN1/VIN2
1.8V TO
5.5V
+
VOUT1
LDO 1
EN LD1
VBIAS
1µF
EN1
ON
ON
+
OFF
OFF
1µF
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
VOUT2
LDO 2
EN2
+
EN LD2
VBIAS
1µF
VIN3
1.8V TO
5.5V
+
VOUT3
LDO 3
1µF
EN3
ON
+
High PSRR
OFF
EN LD3
1µF
76 dB PSRR up to 1 kHz
70 dB PSRR at 10 kHz
GND
60 dB PSRR at 100 kHz
Figure 1. Typical Application Circuit for ADP322
40 dB PSRR at 1 MHz
Low output noise
VBIAS
ADP323
24 µV rms typical output noise at VOUT = 1.2 V
43 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
VBIAS
2.5V TO
5.5V
+
1µF
VIN1/VIN2
1.8V TO
5.5V
VOUT1
+
LDO 1
EN LD1
VBIAS
1µF
EN1
+
ON
ON
FB1
FB2
1µF
OFF
OFF
Guaranteed 200 mA output current per regulator
−40°C to +125°C junction temperature
VOUT2
LDO 2
+
EN2
1µF
EN LD2
VBIAS
APPLICATIONS
VIN3
Mobile phones
1.8V TO
5.5V
VOUT3
+
LDO 3
Digital cameras and audio devices
Portable and battery-powered equipment
Portable medical devices
1µF
EN3
+
ON
FB3
1µF
OFF
EN LD3
GND
Post dc-to-dc regulation
Figure 2. Typical Application Circuit for ADP323
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 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 ADP323 adjustable
triple LDO can be configured for any output voltage between
0.5 V and 5 V with two resistors for each output.
The ADP322/ADP323 PSRR is greater than 60 dB for frequencies
as high as 100 kHz 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. E
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