Analog Devices ADP225 Evaluation Board ADP225CP-EVALZ ADP225CP-EVALZ Data Sheet
Product codes
ADP225CP-EVALZ
Dual, 300 mA Output, Low Noise,
High PSRR Voltage Regulators
Data Sheet
Rev. D
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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 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 V
OUT
= 1.2 V, 50 µV rms at V
OUT
= 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 (
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 (
)
Adjustable output voltage range from 0.5 V to 5.0 V
)
Quick output discharge (QOD)—
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
Portable medical devices
Post dc-to-dc regulation
Point of sale terminals
Credit card readers
Automatic meter readers
Wireless network equipment
TYPICAL APPLICATION CIRCUITS
EN1
VOUT1
VIN
EN2
GND
6
4
3
2
ADJ2
VOUT2
1
8
5
7
ADJ1
ADP223/
ADP225
R1
R4
R2
ON
OFF
ON
OFF
V
IN
= 4.2V
+ C1
1µF
+ C3
1µF
+ C2
1µF
VOUT1 = 2.8V
VOUT2 = 2.0V
09376-
001
R3
Figure 1.
EN1
VOUT1
VIN
EN2
GND
6
4
3
2
SENSE2
VOUT2
1
8
5
7
SENSE1
ADP222/
ADP224
ON
OFF
ON
OFF
V
IN
= 4.2V
+ C1
1µF
+ C3
1µF
+ C2
1µF
VOUT2 = 3.3V
VOUT1 = 1.5V
09376-
101
Figure 2.
GENERAL DESCRIPTION
The 300 mA, adjustable dual output
and
fixed dual output
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
voltage regulator that is ideally suited for wireless applications
with demanding performance and board space requirements.
The
are available with fixed outputs voltages
from 0.8V to 3.3V. The adjustable output
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
current, low dropout voltage, and wide input voltage range of
the
extend the battery life
maintain power
supply rejection greater than 60 dB for frequencies as high as
100 kHz while operating with a low headroom voltage. The
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
noise bypass capacitor. Overcurrent and thermal protection
circuitry prevent damage in adverse conditions.
The
and
are identical to the
and
, respectively, but with the addition of a quick output
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.
tiny 1 µF, ±30% ceramic output capacitors, resulting in the smallest
possible board area for a wide variety of portable power needs.