Evaluation Board User Guide
UG-054
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
Setting Up the Evaluation Board for the ADP150
FEATURES
Input voltage range: 2.2 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
Simple device measurements such as line and load regulation,
dropout voltage, and ground current can be demonstrated with
only a single voltage supply, a voltage meter, a current meter,
and load resistors.
For more information about the ADP150 linear regulator, see
the ADP150 data sheet.
GENERAL DESCRIPTION
The
ADP150
evaluation board is used to demonstrate
the functionality of the ADP150 linear regulator.
EVALUATION BOARDS
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Figure 1. TSOT PCB Layout
Figure 2. WLCSP PCB Layout
Please see the last page for an important warning and disclaimers.
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TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Evaluation Boards ............................................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware ............................................................ 3
Evaluation Board Configurations .............................................. 3
Output Voltage Measurements ....................................................... 4
Line Regulation Measurements .................................................. 5
Evaluation Board User Guide
Load Regulation Measurements ..................................................5
Dropout Voltage Measurements..................................................5
Ground Current Measurements ......................................................6
Ground Current Consumption ...................................................7
Ordering Information .......................................................................8
Bill of Materials ..............................................................................8
ESD Caution...................................................................................8
REVISION HISTORY
1/10—Revision 0: Initial Version
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Evaluation Board User Guide
EVALUATION BOARD HARDWARE
EVALUATION BOARD CONFIGURATIONS
The
ADP150
evaluation board is supplied with different com-
ponents, depending on the version that is ordered. Components
common to both versions are C2, C4, and J1. Figure 3 and Figure 4
show the schematics of these evaluation board configurations.
Table 1 describes the components.
V
IN
1
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Table 1. Evaluation Board Hardware Components
Component
U1
1
C1
2
C2
C3
2
C4
J1
1
V
OUT
VIN
GND
EN
NC
4
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VOUT
5
C2
C1
J1
2
3
U1
C3
C4
Description
ADP150 low dropout linear regulator
Input bypass capacitor, 1 μF, 0402 size (not
populated)
Input bypass capacitor, 1 μF, 0603 size
Output capacitor, 1 μF, 0402 size (not populated)
Output capacitor, 1 μF, 0603 size
Jumper (connects EN to VIN for automatic
startup)
Figure 3. Evaluation Board Schematic, TSOT
The evaluation board with the WLCSP package is the ADP150CB-3.3-EVALZ.
The evaluation board with the TSOT package is the ADP150UJ-3.3-EVALZ.
2
C1 and C3 are not populated. The ADP150 evaluation board requires only
one input bypass capacitor and one output capacitor for stable operation.
V
IN
VIN
C2
C1
J1
EN
U1
GND
VOUT
C3
C4
V
OUT
Figure 4. Evaluation Board Schematic, WLCSP
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OUTPUT VOLTAGE MEASUREMENTS
Evaluation Board User Guide
VOLTMETER
VOLTAGE SOURCE
LOAD
Figure 5. Output Voltage Measurement Setup, TSOT
VOLTAGE SOURCE
VOLTMETER
LOAD
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Figure 6. Output Voltage Measurement Setup, WLCSP
Figure 5 and Figure 6 show how the evaluation board can be
connected to a voltage source and a voltage meter for basic out-
put voltage accuracy 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
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.
2.
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.
3.
4.
5.
Connect a load between the VOUT pad and one of the
GND pads.
Connect the negative terminal (−) of the voltage meter to
one of the GND pads.
Connect the positive terminal (+) of the voltage meter to
the VOUT pad.
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.
If the load current is large, the user must connect the voltage
meter as close as possible to the output capacitor to reduce the
effects of IR drops.
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Evaluation Board User Guide
LINE REGULATION MEASUREMENTS
For line regulation measurements, the output of the regulator
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, V
IN
must be varied between V
OUTNOM
+ 0.4 V
(or 2.2 V, whichever is greater) and V
INMAX
.
For example, for an
ADP150
with a fixed 3.3 V output, V
IN
must be varied between 3.7 V and 5.5 V. This measurement
can be repeated under different load conditions. Figure 7
shows the typical line regulation performance of an ADP150
with a fixed 3.3 V output.
3.300
I
OUT
= 0.1mA
DROPOUT VOLTAGE (mV)
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DROPOUT VOLTAGE MEASUREMENTS
Dropout voltage can be measured using the configurations
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 to output
voltages above 2.2 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 9
shows the typical curve of dropout voltage measurements with
different load currents.
80
70
60
50
40
30
20
10
3.298
I
OUT
= 1mA
3.296
I
OUT
= 10mA
V
OUT
(V)
3.294
I
OUT
= 50mA
3.292
3.290
I
OUT
= 100mA
I
OUT
= 150mA
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3.7
3.9
4.1
4.3
4.5
4.7
4.9
5.1
5.3
5.5
1
10
I
OUT
(mA)
100
1000
V
IN
(V)
Figure 7. Output Voltage (V
OUT
) vs. Input Voltage (V
IN
) at T
A
= 25°C
Figure 9. Dropout Voltage vs. Load Current (I
OUT
) at V
OUT
= 3.3 V, T
A
= 25°C
LOAD REGULATION MEASUREMENTS
For load regulation measurements, the output of the regulator
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 150 mA.
Figure 8 shows the typical load regulation performance of an
ADP150 with a fixed 3.3 V output for an input voltage of 3.7 V.
3.298
3.297
3.296
3.295
V
OUT
(V)
3.294
3.293
3.292
3.291
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3.290
0.01
0.1
1
I
OUT
(mA)
10
100
1000
Figure 8. Output Voltage (V
OUT
) vs. Load Current (I
OUT
) at V
IN
= 3.7 V,
V
OUT
= 3.3 V, T
A
= 25°C
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3.5
0
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