Datasheet

EVAL-ADP130
Rev. 0 | Page 6 of 8
06965-011
+–
VOLTAGE SOURCE
+–
AMMETER
+–
VOLTAGE SOURCE
C1 C2
C3
J1
U1
GND
GND GND
GNDEN
VOUTVIN
VBIAS
LOAD
0.00112
+–
AMMETER
V
IN IIN
VBIAS
IBIAS
0.00112
ANALOG DEVICES
ADP130-x.x-EVALZ
Figure 7. Ground and Bias Current Measurement
GROUND AND BIAS CURRENT MEASUREMENT
Figure 7 shows how the evaluation board can be connected
to voltage sources and ammeters for ground and bias current
measurements. 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.
To connect to voltage sources and ammeters, do the following:
1. Connect the positive terminal (+) of the VIN voltage
source to one of the VIN pads on the evaluation board.
2. Connect the negative terminal (−) of the VIN voltage
source to the negative terminal (−) of the IIN ammeter.
3. Connect the positive terminal (+) of the IIN ammeter to
one of the GND pads on the evaluation board.
4. Connect the positive terminal (+) of the VBIAS voltage
source to the positive terminal (+) of the IBIAS ammeter.
5. Connect the negative terminal (−) of the IBIAS ammeter to
the VBIAS pad on the evaluation board.
6. Connect the negative terminal (−) of the VBIAS voltage
source to one of the GND pads on the evaluation board.
7. Connect a load between the VOUT pad of the evaluation
board and the negative terminal (−) of the VIN voltage source.
8. The voltage sources can now be turned on. If J1 is inserted
(this connects EN to VBIAS for automatic startup), the
regulator powers up.
GROUND AND BIAS CURRENT CONSUMPTION
Ground and bias current measurements are a way of determining
how much current the internal circuits of the regulator are
consuming, while performing 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 (350 mA). Figure 8 shows
the typical ground current consumption for various load levels
at V
IN
= 3.6 V.
06965-014
LOAD CURRENT (mA)
GROUND CURRENT (µA)
0
20
40
60
80
100
120
140
160
180
200
1 10 100 1000
Figure 8. Ground Current vs. Load Current