Triple, 200 mA, Low Noise,
High PSRR Voltage Regulator
Data Sheet
ADP320
FEATURES
TYPICAL APPLICATION CIRCUITS
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
16-lead, 3 mm × 3 mm LFCSP
VBIAS
ADP320
VBIAS
2.5V TO
5.5V
+
+
1µF
1µF
VIN1/VIN2
1.8V TO
5.5V
Initial accuracy: 1%
VOUT1
LDO 1
EN LD1
VBIAS
ON
ON
Stable with 1 µF ceramic output capacitors
No noise bypass capacitor required
3 independent logic controlled enables
Over current and thermal protection
Key specifications
High PSRR
76 dB PSRR up to 1 kHz
70 dB PSRR 10 kHz
60 dB PSRR at 100 kHz
+
EN1
OFF
OFF
1µF
VOUT2
LDO 2
EN2
+
EN LD2
VBIAS
1µF
VIN3
1.8V TO
5.5V
+
VOUT3
LDO 3
1µF
EN3
ON
+
OFF
EN LD3
1µF
40 dB PSRR at 1 MHz
GND
Low output noise
Figure 1. Typical Application Circuit
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 @ 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 ADP320 200 mA triple output LDO combines high PSRR, low
noise, low quiescent current, and low dropout voltage in a voltage
regulator ideally suited for wireless applications with demanding
performance and board space requirements.
LDO offers much lower noise performance than competing LDOs
without the need for a noise bypass capacitor.
The ADP320 triple LDO is available in a miniature 16-lead 3 mm ×
3 mm LFCSP package and is stable with tiny 1 µF 30% ceramic output
capacitors, resulting in the smallest possible board area for a wide
variety of portable power needs.
The low quiescent current, low dropout voltage, and wide input
voltage range of the ADP320 triple LDO extend the battery life of
portable devices. The ADP320 triple LDO maintains power supply
rejection greater than 60 dB for frequencies as high as 100 kHz
while operating with a low headroom voltage. The ADP320 triple
The ADP320 triple LDO is available in output voltage combin-
ations ranging from 0.8 V to 3.3 V and offers over current and
thermal protection to prevent damage in adverse conditions.
Rev. C
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