Datasheet

EVAL-ADP130
Rev. 0 | Page 5 of 8
LOAD REGULATION
For load regulation measurements, the output of the regulator is
monitored while the load is varied. For good load regulation,
the output must change as little as possible with varying load.
The input voltage must be held constant during this measurement.
The load current can be varied from 0 mA to 350 mA. Figure 5
shows the typical load regulation performance of an ADP130
with fixed 1.8 V output for an input voltage of 3.6 V.
06965-013
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
1.795
1.797
1.799
1.801
1.803
1.805
1 10 100 1000
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, which applies only for output voltages
above 1.6 V. Dropout voltage increases with larger loads. For
more accurate measurements, a second voltage meter 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 a typical curve of dropout voltage measurements with
different load currents.
06965-016
I
LOAD
(mA)
DROPOUT VOLTAGE (mV)
10 100 1000
0
10
20
30
40
50
60
70
80
T
A
= 25°C
V
OUT
= 3.0V
V
OUT
= 1.8V
Figure 6. Dropout Voltage vs. Load Current