EVAL-ADP1712 [ADI]
evaluation boards; 评估板
ADI 
Evaluation Board for the
ADP1712/ADP1713/ADP1714
EVAL-ADP1712/ADP1713/ADP1714
FEATURES
GENERAL DESCRIPTION
Input voltage range: 2.5 V to 5.5 V
Output current range: 0 mA to 300 mA
Output voltage accuracy: 1ꢀ
Operating temperature range: −40°C to +125°C
External soft start (ADP1712 fixed)
Adjustable output voltages (ADP1712 adjustable)
Reference bypass to reduce noise (ADP1713)
Track mode (ADP1714)
The ADP1712/ADP1713/ADP1714 evaluation boards are used
to demonstrate the functionality of the ADP1712, ADP1713,
and ADP1714 series of linear regulators. Depending on what
component combinations are used, the evaluation board can
be used for ADP1712 fixed output voltage devices with soft
start, ADP1712 adjustable output voltage devices, ADP1713
fixed output voltage devices with a bypass capacitor, and ADP1714
fixed output voltage devices with tracking.
Simple device measurements such as line and load regulation,
dropout, and ground current can be demonstrated with just a
single voltage supply, a voltage meter, a current meter, and load
resistors.
For more details about the ADP1712/ADP1713/ADP1714
linear regulators, visit www.analog.com.
EVALUATION BOARD
EVAL-ADP1712/ADP1713/ADP1714
GND
GND
C1
C2
U1
C3
R1
J1
R2
VIN
VOUT
GND
EN
SS/ADJ/BYP/TRK
GND
Figure 1.
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards as supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
EVAL-ADP1712/ADP1713/ADP1714
TABLE OF CONTENTS
Line Regulation..............................................................................5
Load Regulation ............................................................................6
Dropout Voltage ............................................................................6
Ground Current Measurements ......................................................7
Ground Current Consumption ...................................................7
Ordering Information.......................................................................8
Bill of Materials..............................................................................8
Ordering Guide .............................................................................8
ESD Caution...................................................................................8
Features .............................................................................................. 1
General Description......................................................................... 1
Evaluation Board .............................................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware and Schematic ................................. 3
Evaluation Board Configurations................................................... 4
ADP1712 Fixed Output with Soft Start..................................... 4
ADP1712 Adjustable Output ...................................................... 4
ADP1713 Fixed Output with Bypass ......................................... 4
ADP1714 Fixed Output with Tracking...................................... 4
Output Voltage Measurements ....................................................... 5
REVISION HISTORY
3/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 8
EVAL-ADP1712/ADP1713/ADP1714
EVALUATION BOARD HARDWARE AND SCHEMATIC
U1
V
V
IN
OUT
C2
1
2
3
5
4
IN
OUT
GND
EN
C1
J1
R1
SS/ADJ/
BYP/TRK
C3 R2
Figure 2. Evaluation Board Schematic
Table 1. Evaluation Board Hardware Components
Component
Function
Description
U11
Linear regulator
Input capacitor
ADP1712/ADP1713/ADP1714 Low Dropout Linear Regulator.
2.2 μF Input Bypass Capacitor.
C1
C2
C32
Output capacitor
Soft start/bypass capacitor
2.2 μF Output Capacitor. Required for stability and transient performance.
10 nF Soft Start Capacitor (ADP1712 Fixed Version) or 10 nF Bypass Capacitor
(ADP1713). Soft start capacitor determines VOUT ramp-up time during startup.
Bypass capacitor reduces output noise and improves PSRR.
R1, R23
J1
Output voltage adjust resistors
Jumper
External Resistors. Used to set VOUT with the ADP1712 adjustable version.
Jumper. Connects EN to IN for automatic startup.
1 Component varies depending on the evaluation board type ordered.
2 Present only on boards with ADP1712 fixed output devices and ADP1713.
3 Present only on boards with ADP1712 adjustable output devices.
Rev. 0 | Page 3 of 8
EVAL-ADP1712/ADP1713/ADP1714
EVALUATION BOARD CONFIGURATIONS
ADP1713 FIXED OUTPUT WITH BYPASS
The ADP1712/ADP1713/ADP1714 evaluation boards come
supplied with different components depending on which
version is ordered. Components common to all versions are
C1, C2, and J1.
Evaluation boards that come supplied with ADP1713 fixed
output voltage option devices has the additional C3 bypass
capacitor to reduce the output noise and improve PSRR. Figure 5
shows the schematic of this evaluation board configuration.
ADP1712 FIXED OUTPUT WITH SOFT START
ADP1713
Evaluation boards that come supplied with the ADP1712 fixed
output voltage option devices has the additional C3 soft start
capacitor. This capacitor controls the rise time when the output
voltage starts up. Figure 3 shows the schematic of this evalua-
tion board configuration.
V
V
IN
OUT
1
2
3
5
IN
OUT
C2
GND
EN
C1
J1
4
BYP
C3
ADP1712
U1
Figure 5. ADP1713 Fixed Output with Bypass
V
V
IN
OUT
1
2
3
5
IN
OUT
C2
GND
EN
C1
J1
ADP1714 FIXED OUTPUT WITH TRACKING
Evaluation boards that come supplied with ADP1714 fixed
output voltage option devices with tracking do not have C3,
R1, or R2 populated. The user can instead connect an external
voltage to the SS/ADJ/BYP/TRK pad of the evaluation board
to use the track function. Figure 6 shows the schematic of this
evaluation board configuration.
4
SS
C3
U1
Figure 3. ADP1712 Fixed Output with Soft Start
ADP1712 ADJUSTABLE OUTPUT
Evaluation boards that come supplied with ADP1712 adjustable
output voltage option devices have the additional R1 and R2
resistors to set the output voltage. Figure 4 shows the schematic
of this evaluation board configuration.
ADP1714
V
V
OUT
IN
1
2
3
5
IN
OUT
C2
GND
EN
C1
J1
ADP1712
ADJUSTABLE
4
TRK
V
V
IN
OUT
V
TRK
1
2
3
5
IN
OUT
U1
Figure 6. ADP1714 Fixed Output with Tracking
C2
GND
EN
C1
J1
R1
R2
4
ADJ
U1
Figure 4. ADP1712 Adjustable Output
The output voltage is set based on the following equation:
R1
R2
VOUT = 0.8 V(1+
)
For example, if R1 = 10 kΩ and R2 = 4.99 kΩ, then VOUT
is 2.403 V.
Rev. 0 | Page 4 of 8
EVAL-ADP1712/ADP1713/ADP1714
OUTPUT VOLTAGE MEASUREMENTS
VOLTMETER
V
VOLTAGE SOURCE
EVAL-ADP1712/
ADP1713/ADP1714
_
+
_
+
GND
GND
C1
C2
U1
C3
R1
J1
R2
VIN
VOUT
LOAD
GND
EN SS/ADJ/BYP/TRK
GND
Figure 7. Output Voltage Measurement
Figure 7 shows how the evaluation board can be connected to
a voltage source and a voltage meter for basic output voltage
accuracy 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 also be used as an alternative. Ensure
that the voltage source can supply enough current for the
expected load levels.
LINE REGULATION
For line regulation measurements, the regulator’s output is
monitored while its input is varied. For good line regulation,
the output must change as little as possible with varying input
levels. To ensure the device is not in dropout during this
measurement, VIN must be varied between VOUTNOM + 0.5 V
(or 2.5 V, whichever is greater) and VINMAX. For example, for
an ADP1712 with fixed 3.3 V output, VIN needs to be varied
between 3.8 V and 5.5 V. This measurement can be repeated
under different load conditions. Figure 8 shows the typical line
regulation performance of an ADP1712 with fixed 3.3 V output.
3.305
Follow these steps to connect to a voltage source and voltage meter:
1. Connect the negative terminal (−) of the voltage source to
one of the GND pads on the evaluation board.
2. Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
3. Connect a load between the VOUT pad and one of the
GND pads.
4. Connect the negative terminal (−) of the voltage meter to
one of the GND pads, and the positive terminal (+) of the
voltage meter to the VOUT pad.
5. The voltage source can now be turned on. If J1 is inserted
(this connects EN to VIN for automatic startup), then the
regulator powers up.
3.300
3.295
3.290
I
I
I
I
I
I
= 100µA
= 1mA
= 10mA
= 100mA
= 200mA
= 300mA
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
3.285
If the load current is large, the user needs to connect the voltage
meter as close as possible to the output capacitor to reduce the
effects of IR drops.
3.280
3.3
3.8
4.3
4.8
5.3
V
(V)
IN
Figure 8. Output Voltage vs. Input Voltage
Rev. 0 | Page 5 of 8
EVAL-ADP1712/ADP1713/ADP1714
LOAD REGULATION
DROPOUT VOLTAGE
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
ADP1712 with fixed 3.3 V output for an input voltage of 3.8 V.
3.304
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.
3.302
3.300
3.298
3.296
3.294
3.292
3.290
180
160
140
120
100
80
60
0.1
1
10
(mA)
100
1000
40
I
LOAD
Figure 9. Output Voltage vs. Load Current
20
0
0.1
1
10
(mA)
100
1000
I
LOAD
Figure 10. Dropout Voltage vs. Load Current
Rev. 0 | Page 6 of 8
EVAL-ADP1712/ADP1713/ADP1714
GROUND CURRENT MEASUREMENTS
VOLTAGE
SOURCE
AMMETER
μA
_
+
_
+
LOAD
EVAL-ADP1712/
ADP1713/ADP1714
GND
GND
C1
C2
U1
C3
R1
J1
R2
VIN
VOUT
GND
GND
EN SS/ADJ/BYP/TRK
Figure 11. Ground Current Measurement
Figure 11 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.
supplying its largest load level (300 mA). Figure 12 shows the
typical ground current consumption for various load levels.
400
350
300
250
200
150
100
50
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.
5. The voltage source can now be turned on. If J1 is inserted
(this connects EN to VIN for automatic startup), then the
regulator powers up.
0
0.1
1
10
(mA)
100
1000
I
LOAD
Figure 12. Ground Current vs. Load Current
When the device is disabled (EN = GND), ground current
drops to less than 1 μA.
Note: Larger ground current levels occur when using an
evaluation board with R1 and R2 present.
GROUND CURRENT CONSUMPTION
Ground current measurements are a way of determining how
much current the regulator’s internal circuits 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
Rev. 0 | Page 7 of 8
EVAL-ADP1712/ADP1713/ADP1714
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Qty Reference Designator Description
Manufacturer/Vendor
Murata or equivalent
Murata or equivalent
Vishay Dale or equivalent
Digi-Key, Corp.
Vendor Part No.
2
1
2
1
4
C1, C2
C3
R1, R2
J1
Capacitor, MLCC, 2.2 μF, 16 V, 0805, X5R
Capacitor, MLCC, 10 nF, 16 V, 0805, X5R
Resistor, 10 kΩ, 1%, 0805
Header, single, STR, 2 pins
IC, LDO regulator
GRM21BR61C225KA88
GRM21BR72A103KA01
CRCW080510K0FKEA
S1012E-36-ND
ADP1712AUJZ-3.3-R7
ADP1712AUJZ-R7
U1
Analog Devices, Inc.
ADP1713AUJZ-3.3-R7
ADP1714AUJZ-3.3-R7
ORDERING GUIDE
Model
Output Voltage
Description
ADP1712-3.3-EVALZ1
ADP1712-EVALZ1
ADP1713-3.3-EVALZ1
ADP1714-3.3-EVALZ1
3.3 V
ADP1712 Fixed 3.3 V Output with Soft Start Evaluation Board
ADP1712 Adjustable Output Evaluation Board
ADP1713 Fixed 3.3 V Output with Bypass Evaluation Board
ADP1714 Fixed 3.3 V Output with Track Mode Evaluation Board
Adjustable, but set to 1.6 V
3.3 V
3.3 V
1 Z = RoHS Compliant Part.
ESD CAUTION
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB06491-0-3/07(0)
Rev. 0 | Page 8 of 8
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