Datasheet

EVAL-ADP1754/ADP1755
Rev. 0 | Page 6 of 12
GROUND CURRENT MEASUREMENT
Figure 8 shows how the evaluation board can be connected to a
voltage source and an ammeter for ground current measure-
ments. 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 be used as an alternative. Ensure that the voltage source used
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 on the evaluation board.
2. Connect the positive terminal (+) of the ammeter to one of
the GND pads of the evaluation board.
3. Connect the negative terminal (−) of the ammeter to the
negative (−) terminal of the voltage source.
4. Connect a load between the VOUT pad of the evaluation
board and the negative (−) terminal of the voltage source.
The voltage source can now be turned on. If J1 is inserted (EN
is connected 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 needs to consume as little current as
possible. Typically, the regulator uses the maximum current
when supplying its largest load level (1.2 A). Figure 7 shows the
typical ground current consumption for various load levels at
V
IN
= 1.9 V. When the device is disabled (EN = GND), ground
current drops to less than 6 µA.
1200
1000
800
600
400
200
0
10 100 1k 10k
GROUND CURRENT (µA)
LOAD CURRENT (mA)
07740-025
Figure 7. Ground Current vs. Load Current
07740-007
VOLTAGE SOURCE
+ –
+ –
0.00112
LOAD
AMMETER
Figure 8. Ground Current Measurement