ADP121评估板(EVAL-ADP121) PDF

Evaluation Board for the ADP121
EVAL-ADP121
FEATURES
Input voltage range: 2.3 V to 5.5 V
Output current range: 0 mA to 150 mA
Output voltage accuracy: ±1%
Operating temperature range: −40°C to +125°C
EVALUATION BOARD BLOCK DIAGRAMS
GND
GND
ANALOG DEVICES
ADP121-xx-EVALZ
C1
GENERAL DESCRIPTION
C2
U1
The ADP121 evaluation boards are used to demonstrate the
functionality of the ADP121 linear regulators.
Simple device measurements such as line and load regulation,
dropout, and ground current can be demonstrated with just a
single voltage supply, a voltmeter, a current meter, and load
resistors.
J1
VIN
VOUT
GND
EN
GND
NOTES
1. xx = 28 (2.8V), 30 (3.0V), 33 (3.3V).
07140-001
For more details about the ADP121 linear regulators, see the
ADP121 data sheet.
07140-014
Figure 1. TSOT
Figure 2. WLCSP
Rev. A
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.
www.analog.com
Tel: 781.329.4700
Fax: 781.461.3113 ©2008–2009 Analog Devices, Inc. All rights reserved.
EVAL-ADP121
TABLE OF CONTENTS
Features .............................................................................................. 1
Load Regulation ............................................................................5
General Description ......................................................................... 1
Dropout Voltage ............................................................................5
Evaluation Board Block Diagrams ................................................. 1
Measuring Ground Current .............................................................6
Revision History ............................................................................... 2
Ground Current Consumption ...................................................7
Evaluation Board Hardware ............................................................ 3
Ordering Information .......................................................................8
Evaluation Board Configurations .............................................. 3
Bill of Materials ..............................................................................8
Measuring Output Voltage .............................................................. 4
Ordering Guide .............................................................................8
Line Regulation ............................................................................. 5
ESD Caution...................................................................................8
REVISION HISTORY
4/09—Rev. 0 to Rev. A
Changes to Figure 2 .......................................................................... 1
Changes to Figure 5 and Figure 6 ................................................... 4
Changes to Figure 12 ........................................................................ 6
Changes to Ordering Guide ............................................................ 8
7/08—Revision 0: Initial Version
Rev. A | Page 2 of 8
EVAL-ADP121
EVALUATION BOARD HARDWARE
EVALUATION BOARD CONFIGURATIONS
Table 1. Evaluation Board Hardware Components
The EVAL-ADP121 is supplied with different components
depending on which version is ordered. Components common
to all versions are C1, C2, and J1 or J2. Figure 3 and Figure 4
show schematics for these evaluation board configurations.
Component
U1 1
VIN
VOUT
VIN
C1
C2
U1
J1
2
GND
3
EN
C2
VOUT 5
J1 or J2
07140-002
1
C1
NC 4
Figure 3. Evaluation Board Circuit Diagram, TSOT
VIN
1
VOUT
C2
J2
U1
EN
GND
07140-010
C1
Description
ADP121 low dropout linear
regulator.
1 μF input bypass capacitor.
1 μF output capacitor. Required for
stability and transient performance.
Jumper. Connects EN to IN for
automatic startup.
This component varies depending on the evaluation board type ordered.
VOUT
VIN
Function
Linear
regulator
Input
capacitor
Output
capacitor
Jumper
Figure 4. Evaluation Board Circuit Diagram, WLCSP
Rev. A | Page 3 of 8
EVAL-ADP121
MEASURING OUTPUT VOLTAGE
VOLTAGE SOURCE
+
GND
GND
VOLTMETER
ANALOG DEVICES
ADP121-xx-EVALZ
+
–
C1
–
C2
U1
J1
LOAD
VOUT
GND
EN
07140-003
VIN
GND
Figure 5. Output Voltage Measurement, TSOT
VOLTAGE SOURCE
–
VOLTMETER
+
+
–
07140-015
LOAD
Figure 6. Output Voltage Measurement, WLCSP
Figure 5 and Figure 6 show how the evaluation board can be
connected to a voltage source and a voltmeter 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.
2.
3.
5.
Connect the negative terminal (−) of the voltmeter to one
of the GND pads.
Connect the positive terminal (+) of the voltmeter to the
VOUT pad.
The voltage source can now be turned on. If J1 or J2 is inserted
(connecting EN to VIN for automatic startup), the regulator
powers up.
If the load current is large, the user needs to connect the
voltmeter as close as possible to the output capacitor to
reduce the effects of IR drops.
Use the following steps to connect to a voltage source and
voltmeter:
1.
4.
Connect the negative terminal (−) of the voltage source to
one of the GND pads on the evaluation board.
Connect the positive terminal (+) of the voltage source to
the VIN pad of the evaluation board.
Connect a load between the VOUT pad and one of the
GND pads.
Rev. A | Page 4 of 8
EVAL-ADP121
LINE REGULATION
DROPOUT VOLTAGE
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 mode during
this measurement, VIN must be varied between VOUT nominal
+ 0.5 V (or 2.3 V, whichever is greater) and VIN maximum. For
example, an ADP121 with a fixed 1.8 V output needs VIN to be
varied between 2.3 V and 5.5 V. This measurement can be
repeated under different load conditions. Figure 7 shows the
typical line regulation performance of the ADP121 with fixed
1.8 V output.
Dropout voltage can be measured using the configuration
shown in Figure 5 and Figure 6. 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 2.3 V. Dropout voltage increases with larger loads.
For more accurate measurements, a second voltmeter 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 9 and
Figure 10 show the typical curves of dropout voltage measurements with different load currents for different output voltages.
180
TA = 25°C
1.806
1.802
160
140
VDROPOUT (mV)
1.804
VOUT (V)
VOUT = 1.8V
TA = 25°C
LOAD = 10µA
LOAD = 100µA
LOAD = 1mA
LOAD = 10mA
LOAD = 50mA
LOAD = 100mA
1.800
120
100
80
VOUT = 2.5V
60
VOUT = 3.3V
1.798
40
1.796
0
3.1
3.5
3.9
VIN (V)
4.3
4.7
5.1
5.5
1
140
1.806
VOUT = 1.8V
VIN = 2.3V
TA = 25°C
TA = 25°C
120
100
VDROPOUT (mV)
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 loads.
The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 150 mA.
Figure 8 shows the typical load regulation performance of the
ADP121 with fixed 1.8 V output for an input voltage of 2.3 V.
80
60
VOUT = 2.5V
40
VOUT = 3.3V
20
1.802
0
1
10
100
ILOAD (mA)
1.800
Figure 10. WLCSP Dropout Voltage vs. Load Current
1.798
0.1
1
10
ILOAD (mA)
100
1000
07140-005
1.796
1.794
0.01
1000
Figure 9. TSOT Dropout Voltage vs. Load Current
LOAD REGULATION
VOUT (V)
100
ILOAD (mA)
Figure 7. Output Voltage vs. Input Voltage
1.804
10
Figure 8. Output Voltage vs. Load Current
Rev. A | Page 5 of 8
1000
07140-013
2.7
07140-004
1.794
2.3
07140-006
20
EVAL-ADP121
MEASURING GROUND CURRENT
AMMETER
VOLTAGE SOURCE
+
–
–
+
GND
GND
ANALOG DEVICES
ADP121-xx-EVALZ
LOAD
C1
C2
U1
J1
VOUT
GND
EN
GND
07140-007
VIN
Figure 11. Ground Current Measurement, TSOT
VOLTAGE SOURCE
–
+
AMMETER
+
07140-016
–
LOAD
Figure 12. Ground Current Measurement, WLCSP
Figure 11 and Figure 12 show the evaluation board 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 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.
Use the following steps to connect to a voltage source and
ammeter:
1.
2.
3.
4.
Connect the positive terminal (+) of the ammeter to one of
the GND pads of the evaluation board.
Connect the negative terminal (−) of the ammeter to the
negative (−) terminal of the voltage source.
Connect a load between the negative (−) terminal of the
voltage source and the VOUT pad of the evaluation board.
The voltage source can now be turned on. If J1 or J2 is inserted
(connecting EN to VIN for automatic startup), the regulator
powers up.
Connect the positive terminal (+) of the voltage source to
the VIN pad on the evaluation board.
Rev. A | Page 6 of 8
EVAL-ADP121
35
Ground current measurements can determine how much current
the regulator’s internal circuits consume while the circuits
perform 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 (150 mA). Figure 13 shows the typical ground current
consumption for various load levels at an input voltage of 2.3 V.
30
VOUT = 1.8V
VIN = 2.3V
TA = 25°C
25
20
15
10
5
0
0.01
0.1
1
10
ILOAD (mA)
100
Figure 13. Ground Current vs. Load Current
Rev. A | Page 7 of 8
1000
07140-008
When the device is disabled (EN = GND), the ground current
drops to less than 1 μA.
GROUND CURRENT (µA)
GROUND CURRENT CONSUMPTION
EVAL-ADP121
ORDERING INFORMATION
BILL OF MATERIALS
Table 2.
Qty
2
1
1
Reference Designator
C1, C2
J1 or J2
U1
Description
Capacitor, MLCC, 1 μF, 10 V, 0402, X5R
Header, single, STR, 2 pins
IC, LDO regulator
Manufacturer/Vendor
Murata or equivalent
Digi-Key Corp.
Analog Devices, Inc.
Vendor Part No.
GRM155R61A105KE15
S1012E-36-ND
ADP121-AUJZ33R7
ADP121-AUJZ30R7
ADP121-AUJZ28R7
ADP121-ACBZ33R7
ADP121-ACBZ30R7
ADP121-ACBZ28R7
ADP121-ACBZ20R7
ADP121-ACBZ18R7
ORDERING GUIDE
Model
ADP121-3.3-EVALZ1
ADP121-3.0-EVALZ1
ADP121-2.8-EVALZ1
ADP121-1.8-EVALZ1
ADP121-1.5-EVALZ1
ADP121-1.2-EVALZ1
ADP121CB-3.3-EVALZ1
ADP121CB-3.0-EVALZ1
ADP121CB-2.8-EVALZ1
ADP121CB-2.0-EVALZ1
ADP121CB-1.8-EVALZ1
ADP121CB-1.5-EVALZ1
ADP121CB-1.2-EVALZ1
ADP121-BL1-EVZ1
1
Output Voltage
3.3
3.0
2.8
1.8
1.5
1.2
3.3
3.0
2.8
2.0
1.8
1.5
1.2
Description
ADP121 3.3 V Output Evaluation Board [TSOT]
ADP121 3.0 V Output Evaluation Board [TSOT]
ADP121 2.8 V Output Evaluation Board [TSOT]
ADP121 1.8 V Output Evaluation Board [TSOT]
ADP121 1.5 V Output Evaluation Board [TSOT]
ADP121 1.2 V Output Evaluation Board [TSOT]
ADP121-1 3.3 V Output Evaluation Board [WLCSP]
ADP121-1 3.0 V Output Evaluation Board [WLCSP]
ADP121-1 2.8 V Output Evaluation Board [WLCSP]
ADP121-1 2.0 V Output Evaluation Board [WLCSP]
ADP121-1 1.8 V Output Evaluation Board [WLCSP]
ADP121 1.5 V Output Evaluation Board [WLCSP]
ADP121 1.2 V Output Evaluation Board [WLCSP]
Blank Evaluation Board
Z = RoHS Compliant Part.
ESD CAUTION
©2008–2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB07140-0-4/09(A)
Rev. A | Page 8 of 8
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