-
1Rev.0
DEMO MANUAL DC2268A-G
DESCRIPTIONDemonstration circuit 2268A-G is a high efficiency,
high density, dual 10A, switch mode step-down power supply on a
compact 1.5-inch × 1.2-inch PCB. It features the LTM®4631 µModule®
regulator. The input voltage is from 4.5V to 15V. The output
voltage is programmable from 0.6V to 1.8V. DC2268A-G can deliver up
to 10A maximum in each channel. As explained in the data sheet,
output current derating is necessary for certain VIN, VOUT, and
thermal conditions. The board operates in continuous con-duction
mode in heavy load conditions. For high efficiency at low load
currents, the resistor jumper (R1/R2) selects pulse-skipping mode
for noise sensitive applications or Burst Mode® operation in less
noise sensitive applica-tions. Two outputs can be connected in
parallel for a single 20A output solution with optional jumper
resistors. The
board allows the user to program how its output ramps up and
down through the TRACK/SS pin. Remote output voltage sensing is
available for improved output voltage regulation at the load point.
An optional input inductor L1 reduces the EMI noise for noise
sensitive applications. DC2268A can be easily inserted to an edge
connector for testing and debugging. These features and the
availability of the LTM4631 in a compact 16mm × 16mm ×
4.41mm LGA package make it ideal for use in many high density
point-of-load regulation applications. The LTM4631 data sheet must
be read in conjunction with this demo manual for working on or
modifying the DC2268A-G.
Design files for this circuit board are available.
LTM4631 Dual 10A or Single 20A
μModule Regulator
BOARD PHOTO
Figure 1. LTM4631/DC2268A-G Demo Board
All registered trademarks and trademarks are the property of
their respective owners.
https://www.analog.com/DC2268A?doc=DC2268A-G.pdfhttps://www.analog.com?doc=DC2268A-G.pdfhttps://www.analog.com/LTM4631?doc=DC2268A-G.pdfhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/DC2268A?doc=DC2268A-G.pdf
-
2Rev.0
DEMO MANUAL DC2268A-G
QUICK START PROCEDURE
PERFORMANCE SUMMARY Specifications are at TA = 25°CPARAMETER
CONDITIONS/NOTES VALUE
Input Voltage Range 4.5V ~ 15V
Output Voltage VOUT1 VIN = 4.5V ~15V, IOUT1 = 0A ~10A 1V ±
1.5%
Output Voltage VOUT2 VIN = 4.5V ~15V, IOUT2 = 0A ~10A 1.5V ±
1.5%
Per Channel Maximum Continuous Output Current Derating is
necessary for certain VIN, VOUT and thermal conditions 10A (per
channel)
Default Operating Frequency 650kHz
Resistor Programmable Frequency Range 250kHz to 780kHz
External Clock Sync. Frequency Range 500kHz to 780kHz
Efficiency of Channel 1 VIN = 5V, VOUT1 = 1.0V, IOUT1 = 10A, fSW
= 650kHz 81.1% (see Figure 3)
Efficiency of Channel 2 VIN = 5V, VOUT2 = 1.5V, IOUT2 = 10A, fSW
= 650kHz 86.0% (see Figure 4)
Load Transient of Channel 1 VIN = 12V, VOUT1 = 1V, ISTEP = 5A ~
7.5A VOPP = 62mV (see Figure 5)
Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.5V, ISTEP = 5A
~ 7.5A VOPP = 69mV (see Figure 6)
Demonstration circuit DC2268A-G is easy to set up to evaluate
the performance of the LTM4631. It can be easily inserted to an
edge connector (SAMTEC MEC2-20-01-L-DV-TR) for testing and
debugging. Please refer to Figure 2 for proper measurement
setup and follow the procedure below:
1. Pull-up the RUN1 (J1 pin 22) and RUN2 (J1 pin 24) between
1.4V – 5V or leave them floating.
2. With power off, connect the input power supply, load and
meters as shown in Figure 2. Preset the load to 0A and VIN supply
to 12V.
3. Turn-on the power supply at the input. The output volt-age in
channel 1 should be 1.0V ± 1.5% (0.985V ~ 1.015V) and the output
voltage in channel 2 should be 1.5V ± 1.5% (1.478V ~ 1.523V).
4. Once the proper output voltage is established, adjust the
load within the operating range and observe the output voltage
regulation, output voltage ripple, effi-ciency and other
parameters. Output ripple should be measured at CO3 and CO4.
5. (Optional) LTM4631 can be synchronized to an exter-nal clock
signal. Remove R2 and apply a clock signal (0V ~ 5V,
square wave) to MODE-PLLIN pin.
6. (Optional) LTM4631 can be configured for a 2-phase single
output at up to 20A on DC2268A-G. Install 0Ω resistors on R26, R27,
R28, R29 and R32, and remove R14, R18 and R30. Output voltage is
set by R7 based on equation VOUT = 0.6V (1 + 60.4k/R7).
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
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3Rev.0
DEMO MANUAL DC2268A-G
QUICK START PROCEDURE
Figure 2. Test Setup of DC2268A-G
Table 1. DC2268A Demo Circuit
DEMO BOARD NUMBER µModule REGULATOR ON THE BOARD OUTPUT
CURRENTDC2268A-A LTM4620 13A,13ADC2268A-B LTM4620A 13A,13ADC2268A-C
LTM4628 8A, 8ADC2268A-D LTM4630 18A,18ADC2268A-E LTM4630-1
18A,18ADC2268A-F LTM4630A 18A, 18ADC2268A-G LTM4631 10A,
10ADC2268A-H LTM4650-1 25A, 25ADC2268A-I LTM4650A-1 25A, 25A
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
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4Rev.0
DEMO MANUAL DC2268A-G
QUICK START PROCEDURE
Figure 3. Measured Efficiency on Channel 1 (VOUT1 = 1.0V,
fSW = 650kHz, Channel 2 Disabled)
Figure 4. Measured Efficiency on Channel 2 (VOUT2 = 1.5V,
fSW = 650kHz, Channel 1 Disabled)
Figure 5. Measured Channel 1, 5A to 7.5A Load Transient (VIN =
12V, VOUT1 = 1.0V)
OUTPUT LOAD CURRENT (A)
EFFI
CIEN
CY (%
)
DC2268AG F03
60
65
70
75
80
85
90
95
100
0 108642
VIN = 5VVIN = 12V
OUTPUT LOAD CURRENT (A)
EFFI
CIEN
CY (%
)DC2268AG F04
60
65
70
75
80
85
90
95
100
0 108642
VIN = 5VVIN = 12V
1VOUT 20MHz BW20mV/DIV
5A to 7.5ALOAD STEP
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
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5Rev.0
DEMO MANUAL DC2268A-G
QUICK START PROCEDURE
Figure 6. Measured Channel 2, 5A to 7.5A Load Transient (VIN =
12V, VOUT2 = 1.5V)
Figure 7. Thermal Performance at VIN = 12V, VOUT1 = 1.0V/9A,
VOUT2 = 1.5V/9A, fSW = 650kHz, TA = 23°C, 400LFM Airflow
1.5VOUT 20MHz BW50mV/DIV
5A to 7.5ALOAD STEP
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
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6Rev.0
DEMO MANUAL DC2268A-G
PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART
NUMBER
Required Circuit Components
1 6 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 22µF 10% 25V
X5R AVX 12103D226KAT2A
2 2 CO1, CO5 CAP, 7343 470µF 20% 6.3V POSCAP PANASONIC
6TPF470MAH
3 4 CO2, CO3, CO4, CO6 CAP, 1210 100µF 10% 6.3V X5R AVX
12106D107KAT2A
4 1 C6 CAP, 0603 4.7µF 20% 6.3V X5R AVX 06036D475MAT2A
5 2 C8, C14 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT2A
6 2 C5, C12 CAP, 0603 1000pF 5% 16V C0G AVX 0603YC102JAT2A
7 2 C16, C17 CAP, 0603 10µF 20% 25V X5R TDK
C1608X5R1E106M080AC
8 2 C18, C20 CAP, 0603 22µF 20% 6.3V X5R TDK
C1608X5R0J226M080AC
9 1 L1 IND, 1.0µH COILCCRAFT XAL5030-102MEC
10 2 R2, R22 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
11 3 R3, R5, R14 RES, 0603 100Ω 5% 0.1W VISHAY
CRCW0603100RJNEA
12 1 R4 RES, 0603 121kΩ 1% 0.1W VISHAY CRCW0603121KFKEA
13 2 R6, R17 RES, 0603 10kΩ 5% 0.1W VISHAY CRCW060310K0JNEA
14 1 R7 RES, 0603 90.9kΩ 1% 0.1W VISHAY CRCW060390K9FKEA
15 1 R9 RES, 0603 0Ω VISHAY CRCW06030000Z0EA
16 1 R10 RES, 0603 7.87kΩ 1% 0.1W VISHAY CRCW0607K87FKEA
17 1 R16 RES, 0603 14kΩ 1% 0.1W VISHAY CRCW060314K0FKEA
18 1 R15 RES, 0603 169kΩ 1% 0.1W VISHAY CRCW0603169KFKEA
19 1 R18 RES, 0603 40.2kΩ 1% 0.1W VISHAY CRCW060340K2FKEA
20 3 R24, R25, R30 RES, 0603 10Ω 5% 0.1W VISHAY
CRCW060310R0JNEA
21 1 U1 IC, VOLTAGE REGULATOR LGA ANALOG DEVICES
LTM4628EV#PBF
Additional Demo Board Circuit Components
1 0 C1, C2, C3, C4, C7, C9, C10, C11, C13, C15 CAP, 0603 OPTION
OPTION
2 0 R1, R8, R11, R12, R13, R19, R20, R21, R23, R26, R27, R28,
R29
RES, 0603 OPTION OPTION
3 0 R31, R32 RES, 2512 OPTION OPTION
Hardware
1 1 J1 CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV-TR
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
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7Rev.0
DEMO MANUAL DC2268A-G
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.
Specifications subject to change without notice. No license is
granted by implication or otherwise under any patent or patent
rights of Analog Devices.
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VOUT1A1VOUT1A2VOUT1A3VOUT1A4VOUT1A5VOUT1B1VOUT1B2VOUT1B3VOUT1B4VOUT1B5VOUT1C1VOUT1C2VOUT1C3VOUT1C4
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A11
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A12
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B8V
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T2B9
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UT2
B10
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B11
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B12
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VIN
M2
VIN
M3
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
VIN
M9
VIN
M10
VIN
M11
VIN
L2V
INL3
VIN
L4V
INL5
VIN
L6V
INL7
VIN
L8V
INL9
VIN
L10
VIN
L11
VINK2 VINK3 VINK4 VINK9 VINK10 VINK11
VINJ2 VINJ3 VINJ4 VINJ9 VINJ10 VINJ11
GN
DA6
GN
DA7
GN
DB6
GN
DB7
GN
DD1
GN
DD2
GN
DD3
GN
DD4
GN
DD9
GN
DD1
0G
ND
D11
GN
DD1
2G
ND
E1
GND E2GND E3GND E4GND E10GND E11GND E12GND F1GND F2GND F3GND
F10GND F11GND F12GND G1GND G3GND G10GND G12GND H1GND H2GND H3GND
H4GND H5GND H6GND H7GND H9GND H10GND H11GND H12
GND M12GND M1GND L12
GND J1GND J5GND J8GND J12GND K1GND K5GND K6GND K7GND K8GND
K12GND L1
SGND C7SGND D6SGND F6SGND F7SGND G6SGND G7
FSE
TC6
PH
AS
MD
G4
DIF
FPE8
DIF
FNE9
CLKOUTG5
MODE-PLLINF4
TEMPJ6
INTV
CC
H8
EX
TVC
CJ7
DIF
FOU
TF8
CO
210
0uF
6.3V
1210
R14 100
R10
*
1%
R16
*
1%
C4
150p
F C11
OP
T
CIN
422
uF25
V12
10
R22
0
R20
OP
T
J1
VIN
1V
IN2
VIN
3V
IN4
GN
D5
GN
D6
GN
D7
GN
D8
GN
D9
GN
D10
GN
D11
GN
D12
GN
D13
GN
D14
N/A
15N
/A16
GN
D17
GN
D18
VO
S1+
19G
ND
20V
OS
1-21
RU
N1
22V
OS
2+23
RU
N2
24V
OU
T125
VO
UT1
26V
OU
T127
VO
UT1
28V
OU
T129
VO
UT1
30V
OU
T131
VO
UT1
32V
OU
T233
VO
UT2
34V
OU
T235
VO
UT2
36V
OU
T237
VO
UT2
38V
OU
T239
VO
UT2
40
R3 100
P3
L11u
H
C2
OP
T
R8
OP
T
R7*
1%
+C
O5
470u
F6.
3VR
17
10K
R13
OP
T
CIN
322
uF25
V12
10R
2 0
C16
10uF
25V
R6
10K
CO
410
0uF
6.3V
1210
C18
22uF
C15
*
P1
CIN
522
uF25
V12
10C
O3
100u
F6.
3V12
10
C17
10uF
25V
C3
OP
T
C8
0.1u
F
R4
121K
1%
R26
OP
T
R25
10
C10
OP
T
R9
0
C20
22uF
R5 100
C13
150p
F
C12
*
C14
0.1u
F
4.7u
FC
6
6.3V
R28
OP
T
R30
10
R29
OP
T
R27
OP
T
R18
* 1%
R19
OP
T
https://www.analog.com/DC2268A?doc=DC2268A-G.pdf
-
8Rev.0
DEMO MANUAL DC2268A-G
© ANALOG DEVICES, INC. 2017–2020
12/20www.analog.com
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
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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
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license granted is expressly made subject to the following
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Customer may not disclose or transfer any portion of the Evaluation
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Customer agrees to promptly return the Evaluation Board to ADI.
ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or
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inform ADI of any occurred damages or any modifications or
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Customer agrees to return to ADI the Evaluation Board at that time.
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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
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FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
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FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
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shall be governed by and construed in accordance with the
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not apply to this Agreement and is expressly disclaimed.
https://www.analog.com/DC2268A?doc=DC2268A-G.pdfhttps://www.analog.com?doc=DC2268A-G.pdf
DescriptionBoard PhotoPerformance SummaryQuick Start
ProcedureParts ListSchematic Diagram
