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ADP123-EVALZ

P1-P3P4-P6P7-P9P10-P12
Evaluation Board User Guide UG-055
Rev. A | Page 7 of 12
Figure 10 and Figure 11 show how the evaluation boards can be
connected to a voltage source and an ammeter for ground current
measurements. A resistor can be used as the load for the regulator.
Ensure that the resistor has a power rating that is adequate to
handle the power that is expected to dissipate across it. An
electronic load can be used as an alternative. Ensure that the
voltage source 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 of the evaluation board.
2. Connect the positive terminal (+) of the ammeter to one
of the GND pads on 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.
When these steps are completed, the voltage source can be
turned on. If J1 is inserted (connecting EN to VIN for auto-
matic startup), the regulator powers up.
GROUND CURRENT CONSUMPTION
Ground current measurements can determine how much current
the internal circuits of the regulator consume while the circuits
perform the regulation function. To be efficient, the regulator
must consume as little current as possible. Typically, the regulator
uses the maximum current when supplying its largest load level
(300 mA). Figure 12 shows the typical ground current consumption
for various load levels at V
OUT
= 3.3 V and T
A
= 25°C.
When the device is disabled (EN = GND), the ground current
drops to less than 1 μA.
0
20
40
60
80
100
120
140
160
180
200
3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4
V
IN
(V)
GROUND CURRENT (µA)
I
OUT
= 100µA
I
OUT
= 1mA
I
OUT
= 10mA
I
OUT
= 100mA
I
OUT
= 200mA
I
OUT
= 300mA
08524-012
Figure 12. Ground Current vs. Input Voltage (V
IN
) at V
OUT
= 3.3 V, T
A
= 25°C
UG-055 Evaluation Board User Guide
Rev. A | Page 8 of 12
ORDERING INFORMATION
To e valuate t he ADP123, use the ADP123-EVALZ and change
the feedback resistors on the board to meet the output voltage
requirement. To evaluate the ADP122, use the ADP122-3.3-
EVALZ with a 3.3 V fixed output or the ADP122UJZ-REDYKIT.
The ADP122UJZ-REDYKIT allows simplified prototyping and
evaluation and is available for every standard fixed output voltage
option in the ADP122 product family. The kit allows the user to
evaluate the different voltage options with one easy-to-order kit.
RedyKit is a trademark of Analog Devices, Inc.
The ADP122UJZ-REDYKIT contains two evaluation boards
and additional surface-mount ADP122 parts with different
output voltages. The ADP122 parts come sorted and stored in
the kit with the Analog Devices, Inc., part number and fixed
output voltage clearly printed on each zip-top bag. A different
part from the kit can be easily soldered onto one of the
evaluation boards supplied with the kit.
08524-013
Figure 13. ADP122UJZ-REDYKIT
BILL OF MATERIALS FOR THE EVALUATION BOARD
Table 2.
Reference Designator Description Manufacturer Part No.
C1, C2 Capacitor, MLCC, 1 μF, 16 V, 0603, X5R Murata (or equivalent) GRM188R61C105KA93
R1, R2 (ADP123 only) 100 kΩ, 0603 size resistors Vishay CRCW06031003F
J1 Jumper, single, STR, two pins Sullins Connector Solutions PEC02SAAN
U1 IC, LDO regulator Analog Devices, Inc. ADP122AUJZ-3.3-R7
ADP123AUJZ-R7
BILL OF MATERIALS FOR THE ADP122UJZ-REDYKIT
Table 3.
Model Output Voltage (V) Package Description
ADP122AUJZ-2.5-R7 2.5 5-Lead TSOT
ADP122AUJZ-2.7-R7 2.7 5-Lead TSOT
ADP122AUJZ-2.8-R7 2.8 5-Lead TSOT
ADP122AUJZ-2.85-R7 2.85 5-Lead TSOT
ADP122AUJZ-2.9-R7 2.9 5-Lead TSOT
ADP122AUJZ-3.0-R7 3.0 5-Lead TSOT
ADP122AUJZ-3.3-R7 3.3 5-Lead TSOT
ADP122-BL1-EVZ 2.5 Evaluation Board
ADP122-3.3-EVALZ 3.3 Evaluation Board
Evaluation Board User Guide UG-055
Rev. A | Page 9 of 12
NOTES
P1-P3P4-P6P7-P9P10-P12

ADP123-EVALZ

Mfr. #:
Buy ADP123-EVALZ
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management IC Development Tools ADP123 Eval Brd
Lifecycle:
New from this manufacturer.
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