Analog Devices ADP1707 Evaluation Board ADP1707-3.3-EVALZ ADP1707-3.3-EVALZ Datenbogen
Produktcode
ADP1707-3.3-EVALZ
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 6 of 8
LOAD REGULATION
For load regulation measurements, the regulator’s output 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 measure-
ment. The load current can be varied from 0 mA to 300 mA.
Figure 9 shows the typical load regulation performance of an
ADP1706 with fixed 3.3 V output for an input voltage of 3.8 V.
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 measure-
ment. The load current can be varied from 0 mA to 300 mA.
Figure 9 shows the typical load regulation performance of an
ADP1706 with fixed 3.3 V output for an input voltage of 3.8 V.
0.1
1000
I
LOAD
(mA)
V
OU
T
(V
)
1
10
100
3.270
3.275
3.280
3.285
3.290
3.295
3.300
3.305
3.310
3.315
06
93
4-
00
9
Figure 9. Output Voltage vs. Load Current
DROPOUT VOLTAGE
Dropout voltage can be measured using the configuration
shown in Figure 7. 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, 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 10
shows a typical curve of dropout voltage measurements with
different load currents.
shown in Figure 7. 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, 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 10
shows a typical curve of dropout voltage measurements with
different load currents.
400
0
10
1000
I
LOAD
(mA)
V
DRO
P
O
UT
(m
V)
100
350
300
250
200
150
100
50
06
93
4-
01
0
Figure 10. Dropout Voltage vs. Load Current