Dual, 300 mA Output, Low Noise,
High PSRR Voltage Regulators
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
Quick output discharge (QOD)—ADP224/ADP225
Overcurrent and thermal protection
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
VOUT2 = 2.0V
VOUT1 = 2.8V
R3 + C3
VIN = 4.2V
Figure 1. ADP223/ADP225
4 SENSE2 VOUT2 5
VOUT1 = 1.5V
VOUT2 = 3.3V
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.
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