Datasheet

UG-116 Evaluation Board User Guide
Rev. A | Page 6 of 12
0.01 0.1 1 10 100 1000
I
LOAD
(mA)
2.77
2.78
2.79
2.80
2.81
2.82
2.83
V
OUT
(V)
08933-008
Figure 11. Output Voltage, V
OUT
vs. Load Current, I
OUT
at V
IN
= 3.2 V,
V
OUT
= 2.8 V, T
A
= 25°C
DROPOUT VOLTAGE MEASUREMENTS
Dropout voltage can be measured using the configurations
shown in Figure 7 and Figure 8. 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 to output
voltages above 2.2 V. Dropout voltage increases with larger loads.
For more accurate measurements, a second 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 12
shows the typical curve of dropout voltage measurements with
different load currents.
0
20
40
60
80
100
120
1 10 100 1000
V
DROPOUT
(mV)
I
LOAD
(mA)
08933-009
Figure 12. Dropout Voltage vs. Load Currents (I
LOAD
)
V
OUT
= 2.8 V, T
A
= 25°C