UG-271: Evaluation Board for the ADP5023/ADP5024/ADP5034/ADP5037 Micro Power Management Unit (PMU) PDF

ADP5023CP-EVALZ/ADP5024CP-EVALZ/
ADP5034-1-EVALZ/ADP5037CP-EVALZ User Guide
UG-271
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
Evaluation Board for the ADP5023/ADP5024/ADP5034/ADP5037
Micro Power Management Unit (PMU)
FEATURES
GENERAL DESCRIPTION
Full-featured evaluation board for the ADP5023/ADP5024/
ADP5034/ADP5037
Standalone capability
Simple device measurements, including line and load
regulation, demonstrable with
A single voltage supply
A voltmeter
An ammeter
Load resistors
Easy access to external components
Cascading options to supply the low dropout (LDO) from
either buck
Dedicated enable option for each channel
Mode option to change bucks from PFM to PWM operation
This user guide describes the hardware for the evaluation of
the ADP5023/ADP5024/ADP5034/ADP5037 and includes
detailed schematics and PCB layouts. The ADP5023/ADP5024/
ADP5034/ADP5037 are available in a 24-lead 4 mm × 4 mm
LFCSP package. The ADP5023/ADP5024 are three-channel
devices that share a common PCB evaluation board. The
ADP5034/ADP5037 are four-channel devices and share a
common evaluation board. The ADP5023/ADP5024/ADP5034
and ADP5037 all operate in the same manner. Note that this
user guide covers all of these boards, but refers to the ADP5034
for simplicity.
The ADP5034 LFCSP evaluation board has two step-down
regulators with two LDOs that enable evaluation of the
ADP5034. The evaluation board is available in an adjustable
voltage option.
Full details on the parts are provided in the appropriate product
data sheet available from Analog Devices, Inc., which should be
consulted in conjunction with this evaluation board user guide.
09808-101
DIGITAL PICTURE OF THE ADP5034 EVALUATION BOARD
Figure 1.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. B | Page 1 of 16
UG-271
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
Measuring Output Voltage ...............................................................8
General Description ......................................................................... 1
Measuring Ground Current .............................................................9
Digital Picture of the ADP5034 Evaluation Board....................... 1
Evaluation Board Schematics and Artwork ................................ 10
Revision History ............................................................................... 2
Ordering Information .................................................................... 14
Using the Evaluation Board............................................................. 3
Bill of Materials ........................................................................... 14
Powering Up the Evaluation Board ............................................ 3
Related Links ................................................................................... 14
Measuring Evaluation Board Performance .................................. 4
REVISION HISTORY
6/14—Rev. A to Rev. B
Changes to Figure 16 ...................................................................... 10
Changes to Figure 20 ...................................................................... 12
Changes to Table 4 .......................................................................... 14
7/12—Rev. 0 to Rev. A
Added ADP5023, ADP5024, and ADP5037
Throughout ......................................................................... Universal
Replaced all Figures Throughout ..................................... Universal
Changes to General Description Section ...................................... 1
Replaced Powering Up the Evaluation Board Section ................. 3
Replaced Evaluation Board Schematics and Artwork
Section .............................................................................................. 10
Changes to Bill of Materials and added Related Links
Section .............................................................................................. 14
8/11—Revision 0: Initial Version
Rev. B | Page 2 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
USING THE EVALUATION BOARD
The ADP5034 evaluation board is supplied fully assembled and
tested. Before applying power to the evaluation board, follow the
procedures in this section.
Enable
Each channel has its own enable pin, which must be pulled high
to enable that channel (see Table 1).
Table 1. Channels of the Enable Pins
Channel
1
2
3
4
Enable Pin
ADP5034/ADP5037
JP4
JP5
JP6
JP7
ADP5023/ADP5024
JP4
JP5
JP6
N/A
Jumper J3 (MODE)
The Jumper JP3 as shown in Figure 1 is used to connect the
MODE pin of the device to either ground or VIN1. To force
Buck 1 and Buck 2 into forced PWM operation, shunt the
center contact of Jumper JP3 (MODE) to the left pin header
to pull the MODE pin high to J1 (VIN1). To allow Buck 1 and
Buck 2 to operate in automatic PWM/PSM operation, shunt
the center contact of JP3 (MODE) to the right pin header to
pull the MODE pin low to J12 (GND1).
Input Power Source
If the input power source includes a current meter, use that meter
to monitor the input current. Connect J1 (VIN1) to J2 (VIN2) with
a short wire. Connect the positive terminal of the power source to
J1 (VIN1) on the evaluation board and the negative terminal of the
power source to J12 (GND).
If the power source does not include a current meter, connect a
current meter in series with the input source voltage. Connect
the positive lead (+) of the power source to the ammeter
positive (+) connection, the negative lead (−) of the power
source to J12 (GND) on the evaluation board, and the negative
lead (−) of the ammeter to J1 (VIN1) on the board. Be aware
that the current meters add resistance to the input source, and
this voltage reduces with high output currents.
positive (+) load terminal, and the negative (−) load terminal to
the evaluation board at J8 (GND).
Input and Output Voltmeters
Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate evaluation
board terminals and not to the load or power sources themselves.
If the voltmeters are not connected directly to the evaluation
board, the measured voltages will be incorrect due to the voltage
drop across the leads and/or connections between the evaluation
board, the power source, and/or the load.
Connect the input voltage measuring voltmeter positive terminal
(+) to the evaluation board at J1 (VIN1), and input voltage
measuring voltmeter negative (−) terminal to the evaluation
board at J12 (GND1).
Connect the output voltage measuring voltmeter positive (+)
terminal to the evaluation board at J5 (VOUT1) for measuring
the output voltage of Buck 1, and the output voltage measuring
voltmeter negative (−) terminal to the evaluation board at
J8 (PGND).
Turning On the Evaluation Board
When the power source and load are connected to the evaluation
board, the board can be powered for operation. Ensure that:
The power source voltage for the Bucks (VIN1, VIN2) is
>2.3 V to <5.5 V. The power source voltage for the LDOs
(VIN3, VIN4) is from VOUT LDO + 0.5 V or 1.7 V (whichever
is greater) to 5.5 V.
The desired channel is enabled and monitors the output voltage.
If the load is not enabled, enable the load; check that it is drawing
the proper current and that the output voltage maintains voltage
regulation.
Setting the Output Voltage of the Bucks
The buck output voltage is set through external resistor
dividers, shown in Figure 2 for Buck 1. The output voltage can
optionally be factory programmed to default values as indicated
in the data sheet. In this event, R1 and R2 are not needed, and
FB1 can be left unconnected. In all cases, VOUT1 must be
connected to the output capacitor. FB1 is 0.5 V.
Output Load
Connect an electronic load or resistor to set the load current. If
the load includes an ammeter, or if the current is not measured,
connect the load directly to the evaluation board, with the positive
(+) load connected to one of the channels. For example, connect
Buck 1, J5 (VOUT1) and the negative (−) load connection to
J8 (GND).
If an ammeter is used, connect it in series with the load. Connect
the positive (+) ammeter terminal to the evaluation board for
Buck 1, J5 (VOUT1), the negative (−) ammeter terminal to the
Rev. B | Page 3 of 16
VOUT1
VIN1
SW1
L1
1µH
VOUT1
BUCK
FB1
AGND
R1
R2
C5
10µF
R1
VOUT1 = VFB1
+1
R2
Figure 2. Buck 1 External Output Voltage Setting
09808-002
POWERING UP THE EVALUATION BOARD
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
Setting the Output Voltage of the LDOs
Each LDO output voltage is set through external resistor dividers
as well as shown in Figure 3 for LDO1. The output voltage can
optionally be factory programmed to default values as indicated in
the data sheet. In this event, FB3 must be connected to the top of
the capacitor on VOUT3 by placing a 0 Ω resistor on RTOP, and
leaving RBOT unpopulated. Refer to Table 2 for the corresponding
0 Ω resistor placements on RTOP per channel.
VOUT3
VIN3
LDO1
FB3
RTOP
VOUT3
C7
1µF
09808-003
VOUT3 = VFB3
09808-001
RBOT
RTOP
+1
RBOT
Figure 4. Demo Board with Trimmer Resistors
Figure 3. LDO1 External Output Voltage Setting
MEASURING EVALUATION BOARD PERFORMANCE
External Resistor Divider Setting for Bucks and LDOs
The ADP5023/ADP5024/ADP5034/ADP5037 demo boards
are supplied with fixed resistors with values chosen for a target
output voltage. Varying the resistor values of the resistor divider
networks varies the output voltage accordingly.
Table 2. External Resistor Dividers (Fixed)
Resistor Divider
RTOP
RBOT
Buck 1
R1
R2
Buck 2
R7
R8
LDO1
R15
R16
LDO2
R11
R12
Aside from the fixed resistors shown in Table 2, the demo
boards also have footprints for trimmer resistors as listed in
Table 3. The trimmer resistors make for easier adjustments
of the output voltage by turning the adjustment slots on top of
the resistors as shown in Figure 4.
Measuring Output Voltage Ripple of the Buck Regulator
To observe the output voltage ripple of Buck 1, place an oscilloscope probe across the output capacitor (COUT_1) with the probe
ground lead at the negative (−) capacitor terminal and the probe
tip at the positive (+) capacitor terminal.
Set the oscilloscope to ac, 10 mV/division, and 2 μs/division
time base, with BW set to 20 MHz to avoid noise to interfere
with the measurements. It is recommended to shorten the
ground loop of the oscilloscope probe to minimize coupling.
A good way of measuring the output voltage ripple is to solder
a wire to the negative (−) capacitor terminal and wrap it around
the barrel of the probe, while the tip directly connects to the
positive (+) capacitor terminal as shown in Figure 5.
09808-005
Turning the adjustment slot clockwise increases the resistance
and vice versa; adjust accordingly to get the desired output
voltage. The footprints are designed for 3214W-1-204E parts,
which are 200 kΩ trimmer resistors. The trimmers are for
quick evaluation purposes and are not recommended for final
application; this is because of the possible mechanical issues and
complex impedance. Once the desired output voltage is found,
replace the trimmers with fixed value resistors.
Table 3. External Resistor Dividers (Trimmer Resistors)
Resistor Divider
RTOP
RBOT
Buck 1
R3
R4
Buck 2
R5
R6
LDO1
R13
R14
LDO2
R9
R10
Rev. B | Page 4 of 16
Figure 5. Measuring Output Voltage Ripple
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
Measuring the Switching Waveform of Buck
Measuring Load Regulation of Buck
To observe the switching waveform with an oscilloscope, place
the oscilloscope probe tip at the end of the inductor with the
probe ground at GND. Set the oscilloscope to dc, 2 V/division,
and 200 ns/division time base.
Test the load regulation by increasing the load at the output and
looking at the change in output voltage. The input voltage must be
held constant during this measurement. To minimize voltage drop,
use short low resistance wires, especially for loads approaching
maximum current.
T
1.7985
1.7980
VIN = 5.5V
1.7975
VOUT (V)
When the MODE pin is set to high, the buck regulators operate in
forced PWM mode. When the MODE pin is set to low, the buck
regulators operate in PWM mode when the load is above a predefined threshold. When the load current falls below a predefined
threshold, the regulator operates in power save mode (PSM),
improving the light load efficiency. Typical PWM and PSM
switching waveforms are shown in Figure 6 and Figure 7.
1.7970
VIN = 3.6V
1.7965
VOUT
1.7960
1
1.7950
2
0
100 200 300 400 500 600 700 800 900 1000 1100 1200
ILOAD (mA)
SW
09808-108
VIN = 2.3V
1.7955
ISW
Figure 8. Buck Load Regulation
Measuring Line Regulation
CH1 50.0mV
CH2 500mA Ω
CH4 2.00V
M 4.00µs
A CH2
240mA
T 28.40%
09808-051
4
Vary the input voltage and examine the change in the output
voltage.
1.7990
1.7985
Figure 6. Typical Waveforms, VOUT1 = 3.3 V, IOUT1 = 30 mA, PSM Mode
T
1.7980
ILOAD = 0mA
1.7975
VOUT (V)
VOUT
1
ISW
ILOAD = 800mA
1.7970
ILOAD = 200mA
1.7965
2
1.7960
ILOAD = 1200mA
SW
1.7950
2.0
2.5
3.0
3.5
4.0
4.5
VIN (V)
4
BW
CH2 500mA Ω
M 400ns A CH2
BW
CH4 2.00V
T 28.40%
220mA
Figure 9. Buck Line Regulation
09808-053
CH1 50mV
Figure 7. Typical Waveforms, VOUT1 = 3.3 V, IOUT1 = 30 mA, PWM Mode
Rev. B | Page 5 of 16
5.0
5.5
09808-109
1.7955
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
Measuring Efficiency of Buck
3.317
Measure the efficiency, η, by comparing the input power with
the output power.
VOUT  I OUT
VIN  I IN
ILOAD = 10mA
3.315
Measure the input and output voltages as close as possible to the
input and output capacitors to reduce the effect of IR drops.
VOUT (V)
η
ILOAD = 1mA
3.316
ILOAD = 100mA
3.314
100
3.313
80
3.311
3.6
60
4.1
4.6
50
40
5.6
Figure 11. LDO Line Regulation
30
Measuring Load Regulation of LDO
20
1
10
100
1k
ILOAD (mA)
10k
09808-110
10
0
5.1
VIN (V)
Figure 10. Buck Efficiency, VIN = 3.6 V, VOUT = 1.8 V
Measuring Inductor Current
For load regulation measurements, the regulator 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 300 mA. Figure 12
shows the typical load regulation performance of the LDO with
a 3.3 V output for different input voltages.
Measure the inductor current by removing one end of the inductor
from its pad and connecting a current loop in series. A current
probe can be connected to this wire.
3.3160
Measuring Line Regulation of LDOs
3.3145
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, VIN must be varied between VOUT nominal + 0.5 V
(or 2.3 V, whichever is greater) and VIN maximum. For example,
a fixed 3.3 V output needs VIN to be varied between 3.8 V and
5.5 V. This measurement can be repeated under different load
conditions. Figure 11 shows the typical line regulation performance
of the LDO with a fixed 3.3 V output.
3.3140
3.3155
VOUT (V)
3.3150
Rev. B | Page 6 of 16
VIN = 5.5V
VIN = 4.2V
3.3135
3.3130
3.3125
VIN = 3.6V
3.3120
3.3115
3.3110
0
50
100
150
200
ILOAD (mA)
Figure 12. LDO Load Regulation
250
300
09808-012
EFFICIENCY (%)
3.312
PWM
70
ILOAD = 300mA
ILOAD = 200mA
09808-111
PSM
90
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
Measuring Dropout Voltage of LDO
Dropout voltage is defined as the input-to-output voltage
differential when the input voltage is set to the nominal output
voltage. One way to measure dropout voltage is to get the
output voltage (VOUT nominal) with VIN initially set to VOUT
nominal + 0.5 V; output load can be set to 100 μA. Then, force
the input voltage equal to VOUT nominal, and measure the output
voltage accordingly (VOUT dropout). Dropout voltage is then
calculated as VOUT nominal − VOUT dropout. This applies only
for output voltages greater than 1.7 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.
Measuring Ground Current Consumption of LDO
Ground current measurements can determine how much current
the internal circuits of the regulator consume while the circuits
UG-271
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 (300 mA). When the device is disabled, the ground
current drops to less than 1 μA. Refer to Figure 14 for a detailed
instruction on how to perform ground current measurements.
Cascading an LDO from the Buck Regulator
For certain applications such as analog circuit supplies, the
LDOs are preferred over the bucks because of better noise
performance. Where not all the buck outputs are being used,
the input supply of the LDO can be taken from these outputs.
An example demo board connection is shown in Figure 13
wherein VOUT1 is tied to VIN3, which is the supply of LDO1.
In this configuration, the output voltage of the buck regulator
should have enough headroom with the desired output voltage
of the LDO to guarantee the LDO to operate within
specifications.
VOLTAGE SOURCE
VOLTMETER
1.99711
+
–
–
09808-113
+
Figure 13. Cascading LDO from Buck
Rev. B | Page 7 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
MEASURING OUTPUT VOLTAGE
VOUT4, make sure that the respective channels are enabled, and
the voltmeters are connected to the respective outputs.
Figure 14 shows how the evaluation board can be connected
to a voltage source and a voltmeter for basic output voltage
accuracy measurements.
Figure 14 shows a voltage source connected to VIN1 and a
voltmeter connected to VOUT1, which is the output of Buck 1.
EN1 is connected to VIN1 via a shunt, which enables Buck 1,
and EN2, EN3, EN4 are connected to ground, disabling the other
channels. When measuring the voltages on VOUT2, VOUT3, and
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.
VOLTAGE SOURCE
–
VOLTMETER
1.99711
+
–
09808-114
+
Figure 14. Ground Current Measurement
Rev. B | Page 8 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
MEASURING GROUND CURRENT
Figure 15 shows 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
VOLTAGE SOURCE
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.
AMMETER
0.00112
–
–
+
09808-115
+
Figure 15. Ground Current Measurement
Rev. B | Page 9 of 16
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ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
09808-009
EVALUATION BOARD SCHEMATICS AND ARTWORK
09808-017
Figure 16. Evaluation Board Schematic of the ADP5023/ADP5024
Figure 17. Evaluation Board Schematic of the ADP5023/ADP5024
Rev. B | Page 10 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
09808-013
UG-271
09808-014
Figure 18. Top Layer, Recommended Layout for ADP5023/ADP5024
Figure 19. Bottom Layer, Recommended Layout for ADP5023/ADP5024
Rev. B | Page 11 of 16
09808-015
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
Figure 20. Evaluation Board Schematic of the ADP5034/ADP5037
09808-021
UG-271
Figure 21. Evaluation Board Schematic of the ADP5034/ADP5037
Rev. B | Page 12 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
09808-010
UG-271
09808-011
Figure 22. Top Layer, Recommended Layout for ADP5034/ADP5037
Figure 23. Bottom Layer, Recommended Layout for ADP5034/ADP5037
Rev. B | Page 13 of 16
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
UG-271
ORDERING INFORMATION
BILL OF MATERIALS
Table 4.
Qty.
1
Reference Designator
U1
Description
Micro PMU
Manufacturer
Analog Devices
2
5
2
2
8
8
4
C1, C6, C7
C41, C3, COUT_3, COUT_41
COUT_2, COUT_1
L1, L2
R3, R4, R5, R6, R91, R101, R13, R14
R8, R7, R1, R2, R15, R16, R111, R121
COUT_1C, COUT_2C, COUT2C21, COUT_2C3
Capacitor, MLCC, 4.7 μF
Capacitor, MLCC, 1.0 μF
Capacitor, MLCC, 10.0 μF
Inductor, 1.0 μH
Trimmer resistors, 200 kΩ
Resistor, 0402, 49.9 K2
Not fitted
Murata
Murata
Murata
Murata
Bournes, Inc.
Vishay Draloric
Not fitted
1
2
With ADP5034/ADP5037 only.
Subject to change depending on the output voltage chosen.
RELATED LINKS
Resource
ADP5023
ADP5024
ADP5034
ADP5037
Description
Dual 3 MHz, 800 mA Buck Regulator with One 300 mA LDO
Dual 3 MHz, 1200 mA Buck Regulators with One 300 mA LDO
Dual 3 MHz, 1200 mA Buck Regulator with Two 300 mA LDOs
Dual 3 MHz, 800 mA Buck Regulators with Two 300 mA LDOs
Rev. B | Page 14 of 16
Part Number
ADP5034 or ADP5037 or
ADP5023 or ADP5024
GRM188R60J475ME19D
GRM188R60J105KA01B
GRM188R60J106ME47D
LQM2HPN1R0MJ0L
3214W-1-204E
CRCW040249K9FKED
Not fitted
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
NOTES
Rev. B | Page 15 of 16
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UG-271
ADP5023CP-EVALZ/ADP5024CP-EVALZ/ADP5034-1-EVALZ/
ADP5037CP-EVALZ User Guide
NOTES
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
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temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
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