Linear Technology DC2268A-1 Quick setup guide

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dc2268aif
DEMO MANUAL DC2268A-I
DESCRIPTION
LTM4650A-1
Dual 25A or Single 50A
μModule Regulator
Demonstration circuit 2268A-I is a high efficiency, high
density, dual 8A, switch mode step-down power supply on
a compact 1.5' ×1.2' PCB. It features the LT M
®
4650A-1
μModule
®
regulator. The input voltage is from 4.5V to
16V. The output voltage is programmable from 0.6V to
5.3V. DC2268A-I can deliver up to 25A 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 conduc-
tion 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
®
in less noise sensitive applications. Two out-
puts can be connected in parallel for a single 50A output
solution with optional jumper resistors. The board allows
the user to program how its output ramps up and down
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
BOARD PHOTO
through the TRACK/SS pin. Remote output voltage sens-
ing 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
LTM4650A-1 in a compact 16mm × 16mm × 4.41mm
LGA package make it ideal for use in many high-density
point-of-load regulation applications. The LTM4650A-1
data sheet must be read in conjunction with this demo
manual for working on or modifying the DC2268A-I.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-I
Figure1. LTM4650A-1/DC2268A-I Demo Board

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dc2268aif
DEMO MANUAL DC2268A-I
QUICK START PROCEDURE
DC2268A-I is easy to set up to evaluate the performance
of the LTM4650A-1. 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 mea-
surement setup and follow the procedure below:
1. Pull up the RUN1(J1 Pin 22) and RUN2(J1 Pin 24)
between 1.4V to 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
voltage in channel 1 should be 3.3V ± 1.5% (3.25V ~
3.35V) and the output voltage in channel 2 should be
1.5V ± 1.5% (1.478V ~ 1.523V),
NOTE:Due to very small PCB size of the DC2268A
board, the LTM43650A-1 module can be quite hot at
heavy load. Cooling air is required. See Figures 7 and 8
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) LTM4650A-1 can be synchronized to an
external clock signal. Remove R2 and apply a clock
signal (0V~5V, square wave) to MODE-PLLIN pin.
6. (Optional) LTM4650A-1 can be configured for a 2-phase
single output at up to 36A on DC2268A-I. Install 0Ω
resistors on R26, R27, R28, R29, R32, and remove
R14, R18 R30. Output voltage is set by R7 based on
equation VOUT = 0.6V (1 + 60.4k/R7).
PERFORMANCE SUMMARY
Table1.
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V ~ 16V
Output Voltage VOUT1 VIN = 4.5~16V, IOUT1 = 0A ~25A 3.3V ± 1.5%
Output Voltage VOUT2 VIN = 4.5~16V, IOUT2 = 0A ~25A 1.5V ± 1.5%
Per-Channel Maximum Continuous Output Current De-rating is necessary for certain VIN, VOUT and thermal conditions 25A (per channel)
Default Operating Frequency 600kHz
External Clock Sync. Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 25A, fSW = 600kHz 94.4%, see Figure3
Efficiency of Channel 2 VIN = 12V, VOUT2 = 1.5V, IOUT2 = 25A, fSW = 600kHz 90.0%, see Figure4
Load Transient of Channel 1 VIN = 12V, VOUT1 = 3.3V, ISTEP = 12.5A ~ 18.75A VOPP = 157mV, see Figure5
Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.5V, ISTEP = 12.5A ~ 18.75A VOPP = 127mV, see Figure6
Table2. DC2268A Demo Circuit
DEMO BOARD NUMBER µModule REGULATOR ON THE BOARD OUTPUT CURRENT
DC2268A-A LTM4620 13A,13A
DC2268A-B LTM4620A 13A,13A
DC2268A-C LTM4628 8A, 8A
DC2268A-D LTM4630 18A,18A
DC2268A-E LTM4630-1 18A,18A
DC2268A-F LTM4630A 18A, 18A
DC2268A-G LTM4631 10A, 10A
DC2268A-H LTM4650-1 25A, 25A
DC2268A-I LTM4650A-1 25A, 25A
Specifications are at TA= 25°C

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dc2268aif
DEMO MANUAL DC2268A-I
QUICK START PROCEDURE
Figure2. Test Setup of DC2268A-I
Figure3. Measured Efficiency on Channel 1 (VOUT1 = 3.3V,
fSW = 600kHz, Channel 2 Disabled)
Figure4. Measured Efficiency on Channel 2 (VOUT2 = 1.5V,
fSW = 600kHz, Channel 1 Disabled)
IO(LOAD CURRENT)
0
60
EFFICIENCY (%)
65
70
75
80
85
90
100
95
510 15 20
25
2268ai F03
VIN = 12V
VIN = 5V
IO(LOAD CURRENT)
0
60
EFFICIENCY (%)
65
70
75
80
85
90
100
95
510 15 20
25
2268ai F04
VIN = 12V
VIN = 5V

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dc2268aif
DEMO MANUAL DC2268A-I
QUICK START PROCEDURE
Figure5. Measured Channel 1 12.5A to 18.75A Load Transient (VIN = 12V, VOUT1 = 3.3V)
Figure6. Measured Channel 12.5A to 18.75A Load Transient (VIN = 12V, VOUT2 = 1.5V)
3.3V
OUT
20MHz BW
100mV/DIV
12.5A to 18.75A
LOAD STEP
1.5V
OUT
20MHz BW
50mV/DIV
12.5A to 18.75A
LOAD STEP

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dc2268aif
DEMO MANUAL DC2268A-I
QUICK START PROCEDURE
Figure7. Thermal Performance at VIN = 12V, VOUT1 = 3.3V/11A, VOUT2 = 1.5V/11A,
fSW = 600kHz, TA= 23°C, No Forced Airflow
Figure8. Thermal Performance at VIN = 12V, VOUT1 = 3.3V/19A, VOUT2 = 1.5V/19A,
fSW = 600kHz, TA= 23°C, 400LFM Airflow

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dc2268aif
DEMO MANUAL DC2268A-I
PARTS LIST
ITEM 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 C7, C15 CAP, 0603 68pF 5% 50V C0G / NP0 AVX 06035A680JAT2A
6 2 C8, C14 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT2A
7 2 C5, C12 CAP, 0603 2200pF 5% 16V C0G AVX 0603YC222JAT2A
8 2 C16, C17 CAP, 0603 10µF 20% 25V X5R TDK C1608X5R1E106M080AC
9 2 C18, C20 CAP, 0603 22µF 20% 6.3V X5R TDK C1608X5R0J226M080AC
10 1 L1 IND, 1.0µH COILCCRAFT XAL5030-102MEC
11 2 R2, R22 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
12 3 R3, R5, R14 RES, 0603 100Ω 5% 0.1W VISHAY CRCW0603100RJNEA
13 1 R4 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA
14 2 R6, R17 RES, 0603 10k 5% 0.1W VISHAY CRCW060310K0JNEA
15 1 R7 RES, 0603 13.3k 1% 0.1W VISHAY CRCW060313K3FKEA
16 1 R9 RES, 0603 0Ω VISHAY CRCW06030000Z0EA
17 2 R10, R16 RES, 0603 5k 1% 0.1W VISHAY CRCW0605K00FKEA
18 1 R15 RES, 0603 143k 1% 0.1W VISHAY CRCW0603143KFKEA
19 1 R18 RES, 0603 40.2k 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 LINEAR TECH. LTM4650AEV-1#PBF
Additional Demo Board Circuit Components
1 0 C1, C2, C3, C4, C9, C10, C11, C13 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: For Demo Board Only
1 1 J1 CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV--TR

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dc2268aif
DEMO MANUAL DC2268A-I
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A

OPTIONAL JUMPER FOR
1 OUTPUT CONFIGURATION
*
*

MODULE
-A LTM4620
-B LTM4620A
-C LTM4628 -D LTM4630
-E LTM4630-1
-F LTM4630A
U1 [1]
-G LTM4631 -H LTM4650-1
- I LTM4650A-1
VOUT1 VOUT2
3.3V/18A 2.5V/18A
R7 R18
13.3K 19.1K
R15
143K
R10 10K
C12
3300p
C7 68p
1.0V/10A 1.5V/10A 90.9K 40.2K 169K
R16C5 10K 3300p
C15
68p
7.87K 1000p 1000p14K OPT OPT
90.9K 40.2K 121K
1.0V/18A 1.5V/18A 7.87K 14K1000p 1000pOPT OPT 3.3V/13A 5V/13A 13.3K 8.25K 191K OPT OPT OPT OPT 47p 33p 3.3V/25A 1.5V/25A 13.3K 40.2K 143K 5K 2200p 5K 2200pOPT OPT 1.0V/8A 1.5V/8A 90.9K 40.2K 121K 7.87K 1000p 14K 1000pOPT OPT
PGOOD1
RUN1
VOS1+
PGOOD2
COMP1
TRACK1
VFB1
VFB1
VFB2 COMP2 RUN2
VFB2
VFB1
VOS1-_R VOS1+_R VOS2+_R VOUT1 VOUT2 VOUT2
VOUT1 RUN2 RUN1
VOS1-_R
VOS1+_R
VOS2+_R
VOS2+
TRACK2
VOS1-
VOS1+
VIN2
INTVCC
INTVCC
VOUT1
VOS1+
VOS1-
INTVCC
VOUT2
EXTVCC
VIN1
VIN2
VOS2+
INTVCC VIN2
INTVCC
VIN1 VIN1
VOUT1 VOUT2
VOUT1
VOUT2
RUN1 RUN2
TRACK1 TRACK2
VFB1 VFB2
COMP1 COMP2
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
3
DEMO CIRCUIT 2268A
Friday, June 23, 2017
11
HIGH EFFICIENCY, STEP-DOWN, MODULE
N/A
LTM4620/LTM4620A/LTM4628/
` \
Simon. T
REGULATOR
C:\PROJECTS\LTM4650A-1\DC2268A-I\DC2268A-4_20170623.DSN LTM4630/LTM4630-1/LTM4631
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
3
DEMO CIRCUIT 2268A
Friday, June 23, 2017
11
HIGH EFFICIENCY, STEP-DOWN, MODULE
N/A
LTM4620/LTM4620A/LTM4628/
` \
Simon. T
REGULATOR
C:\PROJECTS\LTM4650A-1\DC2268A-I\DC2268A-4_20170623.DSN LTM4630/LTM4630-1/LTM4631
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE
www.linear.com
3
DEMO CIRCUIT 2268A
Friday, June 23, 2017
11
HIGH EFFICIENCY, STEP-DOWN, MODULE
N/A
LTM4620/LTM4620A/LTM4628/
` \
Simon. T
REGULATOR
C:\PROJECTS\LTM4650A-1\DC2268A-I\DC2268A-4_20170623.DSN LTM4630/LTM4630-1/LTM4631
C1 OPT
CIN1
22uF 25V
1210
R1
OPT
R11
OPT
CIN2
22uF 25V
1210
+
CO1
470uF 6.3V
7343
R31 OPT
C5*
R23
OPT
P2
R32
OPT
CIN6
22uF 25V
1210
C9
OPT
C7*
R21
OPT
R12 OPT
R15 *
1%
CO6
100uF 6.3V 1210
CO2
100uF 6.3V 1210
U1 [1]
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUTS1
C5
VOUT2
A8
VOUT2
A9
VOUT2
A10
VOUT2
A11
VOUT2
A12
VOUT2
B8
VOUT2
B9
VOUT2
B10
VOUT2
B11
VOUT2
B12
VOUT2
C9
VOUT2
C10
VOUT2
C11
VOUT2
C12
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUTS2
C8
VIN
M2
VIN
M3
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
VIN
M9
VIN
M10
VIN
M11
VIN
L2
VIN
L3
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
L9
VIN
L10
VIN
L11
VIN
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
GND
A6
GND
A7
GND
B6
GND
B7
GND
D1
GND
D2
GND
D3
GND
D4
GND
D9
GND
D10
GND
D11
GND
D12
GND
E1
GND
E2
GND
E3
GND
E4
GND
E10
GND
E11
GND
E12
GND
F1
GND
F2
GND
F3
GND
F10
GND
F11
GND
F12
GND
G1
GND
G3
GND
G10
GND
G12
GND
H1
GND
H2
GND
H3
GND
H4
GND
H5
GND
H6
GND
H7
GND
H9
GND
H10
GND
H11
GND
H12
GND
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
R24 10
CIN4
22uF 25V
1210
C11 OPT
C4
150pF
R16 *
1%
R10*
1%
R14
100
R3
100
J1
VIN
1
VIN
2
VIN
3
VIN
4
GND
5
GND
6
GND
7
GND
8
GND
9
GND
10
GND
11
GND
12
GND
13
GND
14
N/A
15
N/A
16
GND
17
GND
18
VOS1+
19
GND
20
VOS1-
21
RUN1
22
VOS2+
23
RUN2
24
VOUT1
25
VOUT1
26
VOUT1
27
VOUT1
28
VOUT1
29
VOUT1
30
VOUT1
31
VOUT1
32
VOUT2
33
VOUT2
34
VOUT2
35
VOUT2
36
VOUT2
37
VOUT2
38
VOUT2
39
VOUT2
40
R20 OPT
R22
0
P3
CIN3
22uF 25V
1210
R13 OPT
R17
10K
+
CO5
470uF 6.3V
R7* 1%
R8
OPT
C2 OPT
L1 1uH
C16
10uF
25V R2
0
R6
10K
C15*
CO4
100uF 6.3V 1210
C18
22uF
C3 OPT
C17
10uF
25V CO3
100uF 6.3V 1210
CIN5
22uF 25V
1210
P1
R25 10
R26
OPT
R4
121K
1%
C8 0.1uF
C12*
C13
150pF
R5
100
C20
22uF
R9 0
C10 OPT
4.7uF
C6
6.3V
C14 0.1uF
R30 10
R28
OPT
R19
OPT
R18 *
1%
R27
OPT
R29
OPT

8
dc2268aif
DEMO MANUAL DC2268A-I
 LINEAR TECHNOLOGY CORPORATION 2017
LT 0817 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
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observe good laboratory practice standards. Common sense is encouraged.
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