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ADP223CP-EVALZ

P1-P3P4-P6P7-P8
UG-227 ADP223/ADP225 User Guide
Rev. C | Page 4 of 8
OUTPUT VOLTAGE MEASUREMENTS
Figure 3. Output Voltage Measurement Setup
Figure 3 shows the ADP223/ADP225 evaluation board
connected to a voltage source and voltmeters for basic output
voltage accuracy measurements. Resistors can be used as the load
for the regulator. Ensure that the resistors have a power rating
adequate to handle the power expected to be dissipated across
them. An electronic load can also be used as an alternative. In
addition, ensure that the voltage source can supply enough
current for the expected load levels.
Follow these steps to connect to a voltage source and voltmeters:
1. Connect the negative terminal (−) of the voltage source to
one of the GND pads on the evaluation board.
2. Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
3. Connect a load between the VOUT1 pad and GND pad
and the VOUT2 pad and GND pad.
4. Connect the negative terminals (−) of the voltmeters to one
of the GND pads.
5. Connect the positive terminals (+) of the voltmeters to TB5
(VOUT1) and TB6 (VOUT2).
The voltage source can now be turned on. If J1 or J2 is inserted
(connecting EN1 or EN2 to VIN for automatic startup), the
regulator powers up.
LINE REGULATION
For line regulation measurements, the outputs of the regulator are
monitored while the input of the regulator is varied. For good
line regulation, the outputs must change as little as possible with
varying input levels. To ensure that the device is not in dropout
mode during this measurement, V
IN
must be varied between
V
OUTNOM
+ 0.5 V (or 2.5 V, whichever is greater) and V
INMAX
.
For example, for an ADP223/ADP225 with 1.8 V outputs, V
IN
must be varied between 2.5 V and 5.5 V. This measurement can be
repeated under different load conditions. Figure 4 shows the
typical line regulation performance of a single 1.8 V output of an
ADP223/ADP225.
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
2.3
2.7
3.1
3.5
3.9
4.3
4.7
5.1 5.5
V
OUT
(V)
V
IN
(V)
LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 50mA
LOAD = 100mA
LOAD = 300mA
09376-004
Figure 4. Output Voltage (V
OUT
) vs. Input Voltage (V
IN
)
ADP223/ADP225 User Guide UG-227
Rev. C | Page 5 of 8
LOAD REGULATION
For load regulation measurements, the outputs of the regulator
are monitored while the loads are varied. For good load regulation,
the outputs must change as little as possible with varying load.
The input voltage must be held constant during this measurement.
The load currents can be varied from 0 mA to 300 mA per output.
Figure 5 shows the typical load regulation performance of a single
1.8 V output of the ADP223/ADP225 for an input voltage of 2.5 V
over the load current range of 100 µA to 300 mA.
1.780
1.785
1.790
1.795
1.800
1.805
1.810
1.815
1.820
0.1
1
10
100
1000
V
OUT
(V)
LOAD CURRENT (mA)
09376-005
Figure 5. Output Voltage vs. Load Current
DROPOUT VOLTAGE
Dropout voltage can be measured using the configuration shown
in Figure 3. Dropout voltage is defined as the input-to-output
voltage differential when the input voltage is set to the nominal
output voltage. This applies only for output voltages above 2.5 V.
Dropout voltage increases with larger loads. For more accurate
measurements, an additional voltmeter can be used to monitor
the input voltage across the input capacitor. The input supply
voltage may need to be adjusted to account for IR drops, especially
if large load currents are used. Figure 6 shows the typical curve
of the dropout voltage measurement with different load currents.
0
20
40
60
80
100
120
140
160
1 10 100
1000
DROPOUT VOLT
AGE (mV)
LOAD CURRENT (mA)
3.3V
2.8V
09376-006
Figure 6. Dropout Voltage vs. Load Current, V
OUT
= 2.8 V and V
OUT
= 3.3 V
UG-227 ADP223/ADP225 User Guide
Rev. C | Page 6 of 8
GROUND CURRENT MEASUREMENTS
VOLTAGE SOURCE
LOAD
AMMETER
0.00049
LOAD
09376-007
Figure 7. Ground Current Measurement Setup
Figure 7 shows how the ADP223/ADP225 evaluation board can
be connected to a voltage source and an ammeter for ground
current measurements. Resistors can be used as the load for the
regulator. Ensure that the resistors have a power rating adequate
to handle the power expected to be dissipated across them. An
electronic load can be used as an alternative. Ensure that the
voltage source can supply enough current for the expected
load levels.
Follow these steps to connect to a voltage source and ammeter:
1. Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
2. Connect the negative terminal (−) of the ammeter to one of
the GND pads of the evaluation board.
3. Connect the positive terminal (+) of the ammeter to the
negative (−) terminal of the voltage source.
4. Connect a load between the VOUT1 pad and/or the
VOUT2 pad of the evaluation board and the negative (−)
terminal of the voltage source.
The voltage source can now be turned on. If J1 or J2 is inserted
(connecting EN1 or EN2 to VIN for automatic startup), the
regulator powers up.
GROUND CURRENT CONSUMPTION
Ground current measurements can determine how much current
the internal circuits of the regulator are consuming while the
circuits perform the regulation function. To be efficient, the
regulator must consume as little current as possible. Typically, the
regulator uses the maximum current when supplying its largest
load level (300 mA per output). Figure 8 shows the typical ground
current consumption for various load levels at an input voltage of
2.5 V for the single and dual output configurations. The current
shown in Figure 8 does not include the current due to the output
voltage setting dividers.
0
50
100
150
200
250
0.1 1 10 100
GROUND CURRENT (µA)
LOAD CURRENT (mA)
SINGLE OUTPUT
DUAL
OUTPUT
09376-008
Figure 8. Ground Current vs. Load Current
When the device is disabled (EN1 and EN2 = GND), ground
current drops to less than 1 µA.
P1-P3P4-P6P7-P8

ADP223CP-EVALZ

Mfr. #:
Buy ADP223CP-EVALZ
Manufacturer:
Analog Devices Inc.
Description:
ADP223ACPZ-R7 Linear Regulator Evaluation Board
Lifecycle:
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