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EVAL-ADP1720
GROUND CURRENT MEASUREMENTS
CURRENT
METER
_
μ A
+
EVAL-ADP1720
U1
GND
C1
C2
GND
VOLTAGE SOURCE
+
_
VIN
J1
R1
R2
J2
VOUT
LOAD
GND
EN
GND/ADJ
GND
Figure 9.
Figure 9 shows how the evaluation board can be connected
to a voltage source and a current meter for ground current
measurements. A resistor can be used as the load for the
regulator. Ensure 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 the voltage source
used can supply adequate current for the expected load levels.
Follow these steps to connect to a voltage source and current meter:
largest load level (50 mA). Figure 10 shows the typical ground
current consumption for various load levels.
1200
1000
800
600
1.
Connect the positive terminal (+) of the voltage source to
the VIN pad on the evaluation board.
400
2.
Connect the positive terminal (+) of the current meter to
one of the GND pads of the evaluation board.
200
3.
Connect the negative terminal (?) of the current meter to
4.
the negative (?) terminal of the voltage source.
Connect a load between the VOUT pad of the evaluation
board and the negative (?) terminal of the voltage source.
0
0.01
0.1
1
I LOAD (mA)
10
100
5.
The voltage source can now be turned on. If J1 is inserted
Figure 10. Ground Current vs. Load Current
(this connects EN to VIN for automatic startup), then the
regulator powers up.
GROUND CURRENT CONSUMPTION
Ground current measurements are a way of determining how
When the device is disabled (EN = 0 V), ground current is
reduced to less than 1 μA.
Note that larger ground current levels are observed when using
an evaluation board with R1 and R2 present.
much current the regulator’s internal circuits are consuming,
while performing the regulation function. To be efficient, the
regulator must consume as little current as possible. Typically,
the regulator consumes maximum current when supplying its
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