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Tel: 751 329.4700
Fix:78IA6I.31 I3 mow AnilogD
Evaluation Board for the
ADP1706/ADP1707/ADP1708
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are 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 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
FEATURES
Input voltage range: 2.5 V to 5.5 V
Output current range: 0 mA to 1 A
Output voltage accuracy: ±1%
Operating temperature range: −40°C to +125°C
External soft start (ADP1706)
Track mode (ADP1707)
Adjustable output voltages (ADP1708)
GENERAL DESCRIPTION
The ADP1706/ADP1707/ADP1708 evaluation board is used
to demonstrate the functionality of the ADP1706, ADP1707,
and ADP1708 series of linear regulators. Depending on what
component combinations are used, the evaluation board can
be used for ADP1706 fixed output voltage devices with soft
start, ADP1707 fixed output voltage devices with tracking, or
ADP1708 adjustable output voltage devices.
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 ADP1706/ADP1707/ADP1708
linear regulators, visit www.analog.com.
EVALUATION BOARDS
GND GND
GNDGND SS/ADJ/TRK
VIN VOUT
EN
C1 C2
R2
R1
C3
U1
ANALOG
DEVICES
ADP1706/ADP1707/ADP1708
LFCSP
J1
06934-001
Figure 1. Evaluation Board Layout, LFCSP Package
GND
GND GNDEN
GND
SS/ADJ/TRK
VIN VOUT
J1
R2
R1
U1
C1 C2
C3
ANALOG
DEVICES
ADP1706/ADP1707/ADP1708
SOIC 8
06934-002
Figure 2. Evaluation Board Layout, SOIC Package
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 2 of 8
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description......................................................................... 1
Evaluation Boards............................................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware and Schematic ................................. 3
Evaluation Board Configurations................................................... 4
ADP1706 Fixed Output with Soft Start..................................... 4
ADP1707 Fixed Output with Tracking...................................... 4
ADP1708 Adjustable Output ...................................................... 4
Output Voltage Measurements ....................................................... 5
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
REVISION HISTORY
7/07—Revision 0: Initial Version
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EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 3 of 8
EVALUATION BOARD HARDWARE AND SCHEMATIC
SS/ADJ/
TRK
SENSE
OUT
OUT
EN
GND
IN
IN
U1
J1
C1
V
IN
V
OUT
R2
C3
C2
R1
1
2
3
4
8
7
6
5
06934-003
Figure 3. Evaluation Board Schematic
Table 1. Evaluation Board Hardware Components
Component Function Description
U11Linear regulator ADP1706/ADP1707/ADP1708 Low Dropout Linear Regulator.
C1 Input capacitor 4.7 μF Input Bypass Capacitor.
C2 Output capacitor 4.7 μF Output Capacitor. Required for stability and transient performance.
C32Soft start capacitor 10 nF Soft Start Capacitor for the ADP1706. Soft start capacitor determines
VOUT ramp-up time during startup.
R1, R23Output voltage adjust resistors External Resistors. Used to set VOUT with the ADP1708.
J1 Jumper Jumper. Connects EN to IN for automatic startup.
1 Component varies depending on the evaluation board type ordered.
2 Present only on boards with the ADP1706.
3 Present only on boards with the ADP1708.
The evaluation board supplied with me ADP1706 has the
addiiiunal c3 son slari capacitor. This capanlor controls [he
use time when [he ouipm voltage starts up. Figure 4 shows the
schematic of iI-us evaluation board configuration.
ADP1706
EN 55
GND 5:st
m cm
m cm
m
Figure 4. ADP I 706 Fixed Output with So/r Stan
ADP1 707 FIXED OUTPUT WITH TRACKING
The evaluauun board supplied wiih the ADP1707 dues noi have
(:3, R1, or R2 puplllaied. The user can instead connect an
exiemal voltage to the SS/ADJ/TRK pad of ihe evaluation board
m use ihe track function. Figure 5 shows ihe schcmaiic of this
evaluation board configuration,
ADP1 m1
. me
an m #—
GND SENSE 1
IN OUT 3
5 Vain
in our ,
-- (:2
m ;
Figure 5. ADP m7; Fixed Output with Tmzking
Raw | PaqE4 of!
A
EN Am
GND sense
in out
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 4 of 8
EVALUATION BOARD CONFIGURATIONS
The ADP1706/ADP1707/ADP1708 evaluation boards come
supplied with different components depending on which
version is ordered. Components common to all versions are
C1, C2, and J1.
ADP1706 FIXED OUTPUT WITH SOFT START
The evaluation board supplied with the ADP1706 has the
additional C3 soft start capacitor. This capacitor controls the
rise time when the output voltage starts up. Figure 4 shows the
schematic of this evaluation board configuration.
SS
SENSE
OUT
OUT
EN
GND
IN
IN
U1
ADP1706
J1
C1
V
IN
V
OUT
C3
C2
1
2
3
4
8
7
6
5
06934-004
Figure 4. ADP1706 Fixed Output with Soft Start
ADP1707 FIXED OUTPUT WITH TRACKING
The evaluation board supplied with the ADP1707 does not have
C3, R1, or R2 populated. The user can instead connect an
external voltage to the SS/ADJ/TRK pad of the evaluation board
to use the track function. Figure 5 shows the schematic of this
evaluation board configuration.
TRK
SENSE
OUT
OUT
EN
GND
IN
IN
U1
ADP1707
J1
C1
V
IN
V
OUT
V
TRK
C2
1
2
3
4
8
7
6
5
06934-005
Figure 5. ADP1707 Fixed Output with Tracking
ADP1708 ADJUSTABLE OUTPUT
The evaluation board supplied with the ADP1708 has addi-
tional R1 and R2 resistors to set the output voltage. Figure 6
shows the schematic of this evaluation board configuration.
U1
A
DP1708
ADJ
SENSE
OUT
OUT
EN
GND
IN
IN
J1
C1
V
IN
V
OUT
R2
C2
R1
1
2
3
4
8
7
6
5
06934-006
Figure 6. ADP1708 Adjustable Output
The output voltage is set based on the following equation:
⎟
⎠
⎞
⎜
⎝
⎛+= 2
18.0 R
R1
VVOUT
For example, if R1 = 10 kΩ and R2 = 4.99 kΩ, then VOUT
is 2.403 V.
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 5 of 8
OUTPUT VOLTAGE MEASUREMENTS
GND
GND GNDEN
GND
SS/ADJ/TRK
VIN VOUT
J1
R2
R1
U1
C1 C2
C3
ANALOG
DEVICES
ADP1706/ADP1707/ADP1708
SOIC 8
+_
VOLTAGE SOURCE
+
_
VOLTMETER
V
LOAD
06934-007
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.
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.
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.
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 that the device is not in dropout during this
measurement, VIN must be varied between VOUTNOM + 0.6 V
(or 2.5 V, whichever is greater) and VINMAX. For example, for
an ADP1706 with fixed 3.3 V output, VIN needs to be varied
between 3.9 V and 5.5 V. This measurement can be repeated
under different load conditions. Figure 8 shows the typical line
regulation performance of an ADP1706 with fixed 3.3 V output.
3.8 4.2 4.6 5.0 5.4
V
IN
(V)
V
OUT
(V)
3.25
3.26
3.27
3.28
3.29
3.30
3.31
3.32
I
LOAD
= 300mA
I
LOAD
= 100mA
I
LOAD
= 10mA
I
LOAD
= 100µA
I
LOAD
= 1A
I
LOAD
= 500mA
06934-008
Figure 8. Output Voltage vs. Input Voltage
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 6 of 8
LOAD REGULATION
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
ADP1706 with fixed 3.3 V output for an input voltage of 3.8 V.
0.1 1000
I
LOAD
(mA)
V
OUT
(V)
1 10 100
3.270
3.275
3.280
3.285
3.290
3.295
3.300
3.305
3.310
3.315
06934-009
Figure 9. Output Voltage vs. Load Current
DROPOUT VOLTAGE
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.
400
0
10 1000
I
LOAD
(mA)
V
DROPOUT
(mV)
100
350
300
250
200
150
100
50
06934-010
Figure 10. Dropout Voltage vs. Load Current
88
88
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 7 of 8
GROUND CURRENT MEASUREMENTS
GND
GND GNDEN
GND
SS/ADJ/TRK
VIN VOUT
J1
R2
R1
U1
C1 C2
C3
ANALOG
DEVICES
ADP1706/ADP1707/ADP1708
SOIC 8
+_
VOLTAGE
SOURCE
AMMETER
LOAD
_+
μA
06934-011
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.
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.
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
supplying its largest load level (1 A). Figure 12 shows the
typical ground current consumption for various load levels
at VIN = 3.8 V.
0.1 1000
I
LOAD
(mA)
1 10 100
I
GND
(µA)
0
1400
1200
1000
800
600
400
200
06934-012
Figure 12. Ground Current vs. Load Current
When the device is disabled (EN = GND), ground current
drops to less than 1 μA.
Note that larger ground current levels occur when using an
evaluation board with R1 and R2 present.
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ANALOG
DEVICES
www.ana|ng.nnm
EVAL-ADP1706/ADP1707/ADP1708
Rev. 0 | Page 8 of 8
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Qty Reference Designator Description Manufacturer/Vendor Vendor Part No.
2 C1, C2 Capacitor, MLCC, 2.2 μF, 16 V, 0805, X5R Murata or equivalent GRM21BR61C225KA88
1 C3 Capacitor, MLCC, 10 nF, 16 V, 0805, X5R Murata or equivalent GRM21BR72A103KA01
2 R1, R2 Resistor, 10 kΩ, 1%, 0805 Vishay Dale or equivalent CRCW080510K0FKEA
1 J1 Header, single, STR, 2 pins Digi-Key Corp. S1012E-36-ND
1 U1 IC, LDO regulator Analog Devices, Inc. ADP1706ACPZ-3.3-R7 or
ADP1707ACPZ-3.3-R7 or
ADP1708ACPZ-R7
ORDERING GUIDE
Model Output Voltage Description
ADP1706-3.3-EVALZ13.3 V ADP1706 Fixed 3.3 V Output with Soft Start Evaluation Board
ADP1707-3.3-EVALZ13.3 V ADP1707 Fixed 3.3 V Output with Track Mode Evaluation Board
ADP1708-EVALZ1Adjustable, but set to 1.6 V ADP1708 Adjustable Output Evaluation Board
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.
EB06934-0-7/07(0)
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