Page 1
Evaluation Board User Guide
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
UG-179
Evaluation Board for the 1.2 A, 20 V Nonsynchronous Step-Down Regulators
FEATURES
1.2 A maximum load current
±2% output accuracy over temperature range
Wide input voltage range: 3.0 V to 20 V
Output voltage from 0.8 V to 0.85 × V
700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching
frequency options
Automatic PFM/PWM mode switching
Precision enable pin with hysteresis
Integrated high-side MOSFET
Integrated bootstrap diode
ADIsimPower™ online design tool
Available in ultrasmall, 6-lead TSOT package
IN
DEMONSTRATION BOARD
GENERAL DESCRIPTION
The ADP2300/ADP2301 are compact, constant-frequency, currentmode, step-down dc-to-dc regulators with an integrated power
MOSFET. The ADP2300/ADP2301 evaluation boards are complete
solutions that allow the user to evaluate the performance of the
regulators. There are two frequency options available: the ADP2300
runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options
allow the user to make design decisions based on the trade-off
between efficiency and the size of the total solution.
The ADP2300/ADP2301 provide accurate (±2%) output regulation
for load currents up to 1.2 A. Current-mode control provides fast
and stable line and load transient performance. The precision,
EN pin, threshold voltage allows the ADP2300/ADP2301 to be
sequenced from other input/output supplies. The EN pin can also
be used as a programmable UVLO input by using a resistive divider.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Figure 1.
Rev. 0 | Page 1 of 12
09232-001
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UG-179 Evaluation Board User Guide
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Demonstration Board ...................................................................... 1
Revision History ............................................................................... 2
Using the Evaluation Board ............................................................. 3
Jumper Setting .............................................................................. 3
Input Power Source Connection ................................................ 3
Output Load Connection ............................................................ 3
REVISION HISTORY
8/10—Revision 0: Initial Version
Input and Output Voltmeter Connections.................................3
Power On the Evaluation Board ..................................................3
Measuring Evaluation Board Performance ...................................3
Typical Performance Characteristics ..............................................5
Demonstration Board Schematics and Bill of Materials ..............7
ADP2300 Schematic and Bill of Materials .................................7
ADP2301 Schematic and Bill of Materials .................................8
Demonstration Board Layout ..........................................................9
Rev. 0 | Page 2 of 12
Page 3
Evaluation Board User Guide UG-179
USING THE EVALUATION BOARD
The ADP2300/ADP2301 evaluation boards are fully assembled
and tested. Before applying power to the evaluation boards, follow
the procedures in this section.
JUMPER SETTING
Jumper J5 enables the part. Connect a jumper between Position 1
and Position 2 to enable the part. Connect a jumper between
Position 2 and Position 3 to disable the part. Leave Jumper J5
open to obtain an approximately 7.8 V V
Table 1. Jumper J5 (EN) Setting
State Function
High Enable the part
Low Disable the part
Open Program the VIN start-up voltage to be about 7.8 V
start-up voltage.
IN
INPUT POWER SOURCE CONNECTION
Before connecting the power source to the ADP2300/ADP2301
evaluation board, make sure that the evaluation board is turned off.
If the input power source includes a current meter, use that
meter to monitor the input current. Connect the positive terminal
of the power source to the VIN terminal (J1) on the evaluation
board, and the negative terminal of the power source to the
GND terminal (J3) of the board. If the power source does not
include a current meter, connect a current meter in series with
the input source voltage. Connect the positive terminal of the
power source to the current meter’s positive lead (+), the negative
terminal of the power source to the GND terminal (J3) on the
evaluation board, and the negative lead (−) of the current meter
to the VIN terminal (J1) on the board.
OUTPUT LOAD CONNECTION
Make sure that the board is turned off before connecting the load.
If the load includes a current meter, or if the current is not
measured, connect the load directly to the demonstration board
with the positive (+) load connection to the VOUT terminal (J2)
and negative (−) load connection to the GND terminal (J4). If a
current meter is used, connect it in series with the load; connect
the positive (+) current meter terminal to the evaluation board
VOUT terminal (J2), the negative (−) current meter terminal to
the positive (+) load terminal, and the negative (−) load terminal to
the evaluation board GND terminal (J4).
INPUT AND OUTPUT VOLTMETER CONNECTIONS
Measure the input and output voltages with voltmeters. Make
sure that the voltmeters are connected to the appropriate test
point on the board. If the voltmeters are not connected to the
right test point, the measured voltages will be incorrect due to
the voltage drop across the leads and/or connections between
the board, the power source, and/or the load.
Rev. 0 | Page 3 of 12
Connect the input voltage measuring the voltmeter’s positive
terminal (+) to the input capacitor (C2) positive terminal and the
negative (−) terminal to the input capacitor (C2) negative
terminal.
Connect the output voltage measuring the voltmeter’s positive (+)
terminal to the output capacitor (C3 or C4) positive terminal
and the negative (−) terminal to the output capacitor (C3 or C4)
negative terminal.
POWER ON THE EVALUATION BOARD
When the power source and load are connected to the ADP2300/
ADP2301 evaluation board, they can be powered up for operation.
If the input power source voltage goes higher than 7.8 V with
Jumper J5 open, the output voltage goes up to 3.3 V.
MEASURING EVALUATION BOARD PERFORMANCE
Measuring the Switching Waveform
To observe the switching waveform with an oscilloscope, place
the oscilloscope probe tip at the end of inductor connected to
the SW pin with the probe ground at GND. Set the scope to dc,
5 V/division, and 1 μs/division time base. The switching waveform
should alternate between 0 V and approximately the input voltage.
Measuring Load Regulation
Load regulation should be tested by increasing the load current
at the output and measuring the output voltage across the output
capacitor (C3 or C4).
Measuring Line Regulation
Vary the input voltage and measure the output voltage at a fixed
output current. The input voltage can be measured across the
input capacitor (C2), and the output voltage can be measured
across the output capacitor (C3 or C4).
Measuring Efficiency
The efficiency, η, is measured by comparing the input power
with the output power.
×
OUTOUT
=η
Measuring Inductor Current
The inductor current is measured by removing one end of the
inductor from the pad on the board and using a wire connected
between the pad and the inductor. Then a current probe is used
to measure the inductor current.
IVIV×
ININ
Page 4
UG-179 Evaluation Board User Guide
Measuring Output Voltage Ripple
To observe the output voltage ripple, place an oscilloscope probe
across the output capacitor (C3 or C4) with the probe ground
lead at the negative (−) capacitor terminal and the probe tip at
the positive (+) capacitor terminal. Set the oscilloscope to ac,
1 mV/division, and 1 μs/division time base, 20 MHz bandwidth.
The standard oscilloscope probe has a long wire ground clip.
For high frequency measurements, this ground clip picks up
high frequency noise and injects it into the measured output
ripple. Make sure to keep the ground lengths on the
oscilloscope probe as short as possible to get a clean voltage
ripple measurement.
Varying the Output voltage
The ADP2300/ADP2301 demonstration board output is preset
to 3.3 V; however, the output voltage can be adjusted to other
output voltages using the following equation:
⎛
⎞
R
2
⎜
⎟
V
OUT
+×=
1V800.0
⎜
⎝
⎟
R
4
⎠
Rev. 0 | Page 4 of 12
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Evaluation Board User Guide UG-179
C
A
A
TYPICAL PERFORMANCE CHARACTERISTICS
100
90
80
Y (%)
70
0.20
0.15
0.10
0.05
TION (%)
0
f
SW
f
SW
= 1.4MHz
= 700kHz
EFFICIEN
60
50
INDUCTOR: LPS6225-472MLC
DIODE: B230A
40
0 0.2 0.4 0.6 0.8 1.0 1.2
I
(A)
OUT
Figure 2. Efficiency Curve, VIN = 12 V, fSW = 1.4 MHz
100
INDUCTOR: L PS6225-103MLC
DIODE: B230A
90
80
70
EFFICIENCY (%)
60
50
40
0 0.2 0. 4 0.6 0.8 1.0 1.2
I
(A)
OUT
Figure 3. Efficiency Curve, VIN = 12 V, fSW = 700 kHz
0.20
0.15
0.10
f
SW
f
SW
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
= 1.4MHz
= 700kHz
= 5.0V
= 3.3V
= 2.5V
= 5.0V
= 3.3V
= 2.5V
= 1.8V
= 1.2V
–0.05
LOAD REGUL
–0.10
–0.15
–0.20
09232-072
0.20 0.4 0.6 0.8 1.0 1.2
I
(A)
OUT
Figure 5. Load Regulation, V
= 3.3 V, VIN = 12 V
OUT
9232-067
V
OUT
1
4
2
CH1 5mV
9232-073
Figure 6. Steady State at Heavy Load, fSW = 1.4 MHz, I
B
CH2 5V M400ns A CH2 7.4V
W
CH4 500mA Ω
IL
SW
B
W
B
W
OUT
09232-024
= 1 A
V
1
OUT
0.05
TION (%)
0
–0.05
LINE REGUL
–0.10
–0.15
–0.20
5 8 11 14 17 20
VIN (V)
Figure 4. Line Regulation, V
= 3.3 V, I
OUT
= 500 mA
OUT
4
2
CH1 20mV
9232-068
B
CH2 5V M10µs A CH2 8V
W
CH4 200mA Ω
Figure 7. Steady State at Light Load, f
IL
SW
B
W
B
W
= 1.4 MHz, I
SW
= 40 mA
OUT
9232-025
Rev. 0 | Page 5 of 12
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UG-179 Evaluation Board User Guide
V
V
OUT
1
IL
1
OUT
4
EN
SW
3
2
CH1 1V
CH3 10V
B
CH2 10V M100µs A CH3 8V
W
B
CH4 500mA Ω
W
B
W
B
W
Figure 8. Soft Start with 1 A Resistance Load, fSW = 1.4 MHz
1
4
2
CH1 50mV
B
CH2 10V M100µs A CH4 630mA
W
CH4 500mA Ω
B
W
B
W
Figure 9. ADP2301 Load Transient, 0.2 A to 1.0 A, V
1
4
2
CH1 100mV
= 1.4 MHz, L = 4.7 μH, C
(f
SW
B
CH2 10V M100µs A CH4 630mA
W
CH4 500mA Ω
= 22 μF)
OUT
B
W
B
W
Figure 10. ADP2300 Load Transient, 0.2 A to 1.0 A, V
= 700 kHz, L = 10 μH, C
(f
SW
= 22 μF)
OUT
V
OUT
I
OUT
SW
= 3.3 V, VIN = 12 V
OUT
V
OUT
I
OUT
SW
= 3.3 V, VIN = 12 V
OUT
V
IN
SW
3
2
CH1 5mV
09232-026
CH3 5V
B
CH2 10V M1ms A CH3 11.4V
W
B
W
9232-061
Figure 11. ADP2301 Line Transient,
7 V to 15 V, V
= 3.3 V, I
OUT
100
80
60
40
20
0
–20
–40
MAGNITUDE [B/ A] (dB)
–60
–80
CROSS FREQUE NCY: 80kHz
PHASE MARGIN: 68°
–100
09232-058
1k 10k 100k 1M
FREQUENCY (Hz)
Figure 12. ADP2301 Bode Plot, V
= 1.4 MHz, L = 4.7 μH, C
(f
SW
100
80
60
40
20
0
–20
–40
MAGNITUDE [B/A] (dB)
–60
–80
CROSS FREQ UENCY: 47kHz
PHASE MARGIN: 77°
–100
9232-060
1k 10k 100k
FREQUENCY (Hz)
Figure 13. ADP2300 Bode Plot, V
(f
= 700 kHz, L = 10 μH, C
SW
= 1.2 A, fSW = 1.4 MHz
OUT
= 3.3 V, VIN = 12 V
OUT
OUT
1
= 3.3 V, VIN = 12 V
OUT
OUT
= 22 μF)
= 22 μF)
1M
200
160
120
80
40
0
–40
–80
–120
–160
–200
200
160
120
80
40
0
–40
–80
–120
–160
–200
PHASE [B/A] (Degrees)
09232-063
PHASE [B/A] (Degrees)
09232-065
Rev. 0 | Page 6 of 12
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Evaluation Board User Guide UG-179
V
DEMONSTRATION BOARD SCHEMATICS AND BILL OF MATERIALS
ADP2300 SCHEMATIC AND BILL OF MATERIALS
J2
OUT
C4
C3
NC
J4
GND
22µF
Table 2. ADP2300 Demonstration Board Bill of Materials
Qty Reference Designator Description Manufacturer Part Number
1 C1 Capacitor, 0.1 μF, 25 V, 0603, X7R Murata GRM188R71E104KA01
1 C2 Capacitor, 10 μF, 25 V, 1206, X5R Murata GRM31CR61E106KA12
1 C3 Capacitor, 22 μF, 6.3 V, 1206, X5R Murata GRM31CR60J226KE19
1 C4 No assembly N/A1 N/A1
1 D1 Schottky diode, 2 A, 30 V, SMA Diodes, Inc. B230A
4 J1, J2, J3, J4 Header, 1 × 2, 0.1 pitch Harwin M20-9990246
1 J5 Header, 1 × 3, 0.1 pitch Harwin M20-9990346
1 L1 Shielded power inductor, 10 μH, 2.1 A Coilcraft, Inc. LPS6225-103MLC
1 R1 Resistor, 10 kΩ, 1%, 0603 Vishay CRCW060310K0FKEA
1 R2 Resistor, 31.6 kΩ, 1%, 0603 Vishay CRCW060331K6FKEA
1 R3 Resistor, 1.8 kΩ, 1%, 0603 Vishay CRCW06031K80FKEA
1 R4 Resistor, 10.2 kΩ, 1%, 0603 Vishay CRCW060310K2FKEA
1 U1
1.2 A, 20 V, 700 kHz nonsynchronous step-down
switching regulator
1
N/A is not applicable.
L1
10µH
R2
10.2kΩ
C1
0.1µF
R4
BST
1
GND2
FB34EN
ADP2300
(700kHz)
U1
SW
6
5VIN
B230A
D1
31.6kΩ
Figure 14. ADP2300 Demonstration Board Schematic
J1
VIN
C2
R1
10kΩ
R3
1.8kΩ
10µF
J5
1
2
3
EN
J3
GND
Analog Devices, Inc. ADP2300
09232-014
Rev. 0 | Page 7 of 12
Page 8
UG-179 Evaluation Board User Guide
V
ADP2301 SCHEMATIC AND BILL OF MATERIALS
J2
OUT
C4
C3
NC
J4
GND
22µF
Table 3. ADP2301 Demonstration Board Bill of Materials
Qty Reference Designator Description Manufacturer Part Number
1 C1 Capacitor, 0.1 μF, 25 V, 0603, X7R Murata GRM188R71E104KA01
1 C2 Capacitor, 10 μF, 25 V, 1206, X5R Murata GRM31CR61E106KA12
1 C3 Capacitor, 22 μF, 6.3 V, 1206, X5R Murata GRM31CR60J226KE19
1 C4 No assembly N/A1 N/A1
1 D1 Schottky diode, 2 A, 30 V, SMA Diodes, Inc. B230A
4 J1, J2, J3, J4 Header, 1 × 2, 0.1 pitch Harwin M20-9990246
1 J5 Header, 1 × 3, 0.1 pitch Harwin M20-9990346
1 L1 Shielded power inductor, 4.7 μH, 3.0 A Coilcraft, Inc. LPS6225-472MLC
1 R1 Resistor, 10 kΩ, 1%, 0603 Vishay CRCW060310K0FKEA
1 R2 Resistor, 31.6 kΩ, 1%, 0603 Vishay CRCW060331K6FKEA
1 R3 Resistor, 1.8 kΩ, 1%, 0603 Vishay CRCW06031K80FKEA
1 R4 Resistor, 10.2 kΩ, 1%, 0603 Vishay CRCW060310K2FKEA
1 U1
1.2 A, 20 V, 1.4 MHz nonsynchronous step-down
switching regulator
1
N/A is not applicable.
L1
4.7µH
R2
10.2kΩ
C1
0.1µF
R4
BST
1
GND2
FB34EN
ADP2301
(1.4MHz)
U1
SW
6
5VIN
B230A
D1
31.6kΩ
Figure 15. ADP2301 Demonstration Board Schematic
J1
VIN
C2
R1
10kΩ
R3
1.8kΩ
10µF
J5
1
2
3
EN
J3
GND
Analog Devices, Inc. ADP2301
09232-015
Rev. 0 | Page 8 of 12
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Evaluation Board User Guide UG-179
DEMONSTRATION BOARD LAYOUT
Figure 16. Demonstration Board, Top Layer
Figure 17. Demonstration Board, Third Layer
09232-016
Figure 18. Demonstration Board, Second Layer
09232-017
Figure 19. Demonstration Board, Bottom Layer
09232-018
09232-019
Rev. 0 | Page 9 of 12
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UG-179 Evaluation Board User Guide
NOTES
Rev. 0 | Page 10 of 12
Page 11
Evaluation Board User Guide UG-179
NOTES
Rev. 0 | Page 11 of 12
Page 12
UG-179 Evaluation Board 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.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
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
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
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
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the pers onal jurisdiction and venu e of such courts. The United Nations Conventi on on Contracts for the Internation al Sale of Goods shall not apply to this Agreement and is expressly disclaimed.
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG09232-0-8/10(0)
Rev. 0 | Page 12 of 12
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