Datasheet
EVAL-ADP130
Rev. 0 | Page 4 of 8
06965-004
VBIAS
J1
ANALOG DEVICES
ADP130-x.x-EVALZ
VIN VOUT
GND
EN
GND
C1 C2
GND
GND
U1
C3
+–
VOLTMETER
LOAD
1.99711
+–
VOLTAGE SOURCE
+–
VOLTAGE SOURCE
V
OUT
VBIAS
VIN
Figure 3. Output Voltage Measurement
CONFIGURATION OF THE EVALUATION BOARDS
The ADP130 evaluation boards come supplied with different
components depending on which version is ordered. Components
common to all versions are C1, C2, C3, and J1.
OUTPUT VOLTAGE MEASUREMENT
Figure 3 shows how the evaluation board can be connected to a
voltage source and a voltage meter for basic output voltage accuracy
measurements. A resistor can be used as the load for the regulator.
Ensure that the resistor has a power rating adequate to handle
the power expected to be dissipated across it. An electronic load
can also be used as an alternative. Ensure that the voltage source
can supply enough current for the expected load levels.
To connect to the voltage sources and voltage meter, do the
following:
1. Connect the negative terminal (−) of the voltage sources to
one of the GND pads on the evaluation board.
2. Connect the positive terminal (+) of the VIN voltage source to
the VIN pad of the evaluation board.
3. Connect the positive terminal (+) of the VBIAS voltage source
to the VBIAS pad of the evaluation board.
4. Connect a load between the VOUT pad and one of the
GND pads.
5. Connect the negative terminal (−) of the voltmeter to
one of the GND pads, and the positive terminal (+) of the
voltmeter to the VOUT pad.
6. The voltage sources can now be turned on. If J1 is inserted
(this connects EN to VBIAS for automatic startup), the
regulator powers up.
If the load current is large, the user needs to connect the voltage
meter as close as possible to the output capacitor to reduce the
effects of IR drops.
LINE REGULATION
For line regulation measurements, the output of the regulator
is monitored while its input is varied. For good line regulation,
the output must change as little as possible with varying input
levels. To ensure the device is not in dropout during this
measurement, V
IN
must be varied between V
OUT
nominal + 0.5 V
(or 2.3 V, whichever is greater) and V
IN
maximum. For example, for
an ADP130 with fixed 1.8 V output, V
IN
needs to be varied
between 2.3 V and 5.5 V. This measurement can be repeated
under different load conditions. Figure 4 shows the typical line
regulation performance of an ADP130 with fixed 1.8 V output.
0
6965-012
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
1.795
1.796
1.797
1.798
1.799
1.800
1.801
1.802
1.803
1.804
1.805
2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
1mA
10mA
50mA
100mA
200mA
350mA
Figure 4. Output Voltage vs. Input Voltage