1
dc2001af
DEMO MANUAL DC2001A
Description
LTC3787EUFD
4-Phase High Current
Synchronous
Step-Up Converter
Demonstration circuit 2001A is a step-up DC/DC converter
using two LTC3787EUFD dual-phase synchronous boost
controllers in a parallel configuration for high current, high
power 4-phase operation.
The DC2001A has an input supply voltage range from
6V to 24V. The converter provides an output voltage of
24V, with a very high efficiency output of 25A to 30A, as
shown in Figure 2.
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
performance summary
The LTC3787 data sheet gives a complete description
of the part, operation and application information, and
must be read in conjunction with this demo manual for
the DC2001A.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER CONDITIONS UNITS
Minimum Input Voltage IOUT = 0A to 25A 6V
Maximum Input Voltage IOUT = 0A to 30A 24V
Output Voltage VIN = 6V to 24V, MODE = FCC 24V ±2%
Default Operating Frequency FREQ = GND 350kHz
Efficiency VIN = 18V, VO = 24V, IO = 30A 98.2%
Specifications are at TA = 25°C
2
dc2001af
DEMO MANUAL DC2001A
Quick start proceDure
Demonstration circuit 2001A is easy to set up to evalu-
ate the performance of the LTC3787. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
1. Set the jumper as follows:
JP1: FCC
JP2: ON
2. With all power off, connect the input power supply,
load, and meters using heavy duty cables, as shown in
Figure 1.
NOTE: Input supply must be capable of at least 65A at
12V, or 110A at 6V.
3. Preset the system load to 0A and the input supply to
12V, 2A current limit.
4. Turn on the supply and adjust the voltage to the desired
value, up to 24V, while monitoring the output.
NOTE: Do not exceed 33V input.
5. Once the proper output voltage has been established,
increase the current limit as necessary.
6. Turn on the load and adjust as necessary.
Optional
1. For pulse skip or Burst Mode
®
operation, set jumper
JP1 to PS or BM.
2. To shut down switching, set jumper JP2 to OFF.
3. For power good indication, monitor PGOOD.
4. For external clock synchronization, connect the clock
source to CLKIN and remove jumper JP1.
Figure 1. Proper Measurement Equipment Setup
+
–
+
–
+
–
+
–dc2001a F01
VOUT
A
VIN
VOUT LOAD
IOUT
A
VIN SUPPLY
IIN
3
dc2001af
DEMO MANUAL DC2001A
Quick start proceDure
Figure 2. Efficiency Curves, fSW = 350kHz, MODE = FCC
80
82
84
86
88
90
92
94
96
98
100
0 5 10 15 20 25 30 35
Efficiency (%)
Load Current (A)
VIN = 6V
VIN = 9V
VIN = 12V
VIN = 18V
dc2001a F02
4
dc2001af
DEMO MANUAL DC2001A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 32 CIN1A-CIN4A, CIN1B-CIN4B, CIN7A-
CIN10A, CIN7B-CIN10B, COUT1A-COUT2A,
COUT1B-COUT2B, COUT4A-COUT5A,
COUT4B-COUT5B, COUT7A-COUT8A,
COUT7B-COUT8B, COUT10A-COUT11A,
COUT10B-COUT11B
CAP, X7R, 22µF, 20%, 25V, 1812 TDK, C4532X7R1E226M
2 8 CIN5-CIN6, CIN11-CIN12, COUT3, COUT6,
COUT9, COUT12
CAP, 330µF, 20%, 35V, ELECT NIPPON CHEMI-CON,
EMZA350ADA331MJA0G
3 8 C1, C10, C16-C17, C26, C31-C33 CAP, X7R, 0.01µF, 5%, 25V, 0603 AVX, 06033C103JAT2A
4 8 C2, C7-C8, C11, C19, C23-C24, C27 CAP, X7R, 0.1µF, 10%, 25V, 0603 TDK, C1608X7R1E104K
5 2 C4, C21 CAP, X7R, 1µF, 10%, 16V, 0603 TAIYO YUDEN, EMK107BJ105KA-T
6 5 C5, C13, C15, C22, C29 CAP, NPO, 10pF, 5%, 25V, 0603 AVX, 06033A100JAT2A
7 2 C9, C25 CAP, X5R, 4.7µF, 20%, 25V, 0805 TAIYO YUDEN, TMK212BJ475MG-T
8 2 C14, C30 CAP, NPO, 1000pF, 5%, 25V, 0603 AVX, 06033A102JAT2A
9 4 D1-D4 DIODE, SCHOTTKY, 30V, SOD123 INFINEON, BAS140W
10 4 L1-L4 IND, 1.0µH COILCRAFT, SER2010-102MLB
11 12 Q1A-Q8A, Q2B, Q4B, Q6B, Q8B XSTR, MOSFET N-CHANNEL INFINEON, BSC014N04LSI
12 1 R1 RES, 100k, 5%, 1/10W, 0603 VISHAY, CRCW0603100KJNEA
13 8 R5-R6, R17, R20, R31-R32, R39, R41 RES, 10Ω, 5%, 1/10W, 0603 VISHAY, CRCW060310R0JNEA
14 2 R11, R35 RES, 2.2Ω, 5%, 1/10W, 0603 VISHAY, CRCW06032R20JNEA
15 2 R15, R19 RES, 10k, 5%, 1/10W, 0603 VISHAY, CRCW060310K0JNEA
16 1 R22 RES, 38.3k, 1%, 1/10W, 0603 VISHAY, CRCW060338K3FKEA
17 1 R24 RES, 232k, 1%, 1/10W, 0603 VISHAY, CRCW0603232KFKEA
18 2 R25, R28 RES, 12.1k, 1%, 1/10W, 0603 VISHAY, CRCW060312K1FKEA
19 2 R26, R45 RES, 22.1k, 1%, 1/10W, 0603 VISHAY, CRCW060322K1FKEA
20 1 R36 RES, 100Ω, 5%, 1/10W, 0603 VISHAY, CRCW0603100RJNEA
21 8 RSNS1-RSNS8 RES, 0.003Ω, 1%, 1W, 2512 PANASONIC, ERJM1WSF3M0U
22 2 U1, U2 IC, LTC3787EUFD#PBF LINEAR TECHNOLOGY, LTC3787EUFD#PBF
Additional Demo Board Circuit Components
1 0 C3, C6, C12, C18, C20, C28 CAP, OPTIONAL, 0603
2 0 R2, R3, R7, R10, R13, R16, R34, R46-R49 RES, OPTIONAL, 0603
3 18 R4, R8-R9, R12, R14, R18, R21, R23, R27,
R29-R30, R33, R37-R38, R40, R42-R44
RES, 0Ω, JUMPER, 0603 VISHAY, CRCW06030000Z0EA
4 0 Q1B, Q3B, Q5B, Q7B XSTR, MOSFET N-CHAN OPTIONAL
5
dc2001af
DEMO MANUAL DC2001A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Hardware: For Demo Board Only
2 1 JP1 HEADER, 4-PIN, 2mm SULLINS, NRPN041PAEN-RC
3 1 JP2 HEADER, 3-PIN, 2mm SULLINS, NRPN031PAEN-RC
8 2 JP1, JP2 SHUNT SAMTEC, 2SN-BK-G
1 11 E1-E2, E5, E7-E13, E17 TURRET MILL-MAX, 2501-2-00-80-00-00-07-0
4 8 E3-E4, E6, E14-E16, E18-E19 STUD, TEST PIN PEM, KFH-032-10
6 8 E3-E4, E6, E14-E16, E18-E19 LUG RING, #10 KEYSTONE, 8205
7 8 E3-E4, E6, E14-E16, E18-E19 WASHER, #10 TIN PLATED BRASS ANY #10 EXT BZ TN
5 16 E3-E4, E6, E14-E16, E18-E19 (×2) NUT, BRASS 10-32 ANY #10-32
9 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP-ON KEYSTONE, 8834
6
dc2001af
DEMO MANUAL DC2001A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
[2] - FOR VIN < VOUT ONLY
[3] - SURGE VOLTAGE UP TO 30V
MASTER
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL CAPACITORS AND RESISTORS ARE 0603.
SENSE1-
VOUT
SENSE2+
SENSE1+
SGND
TECHNOLOGY
1
01/02/13 12:20:49
12
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
C:\DESIGN\20\2001A-1\2001A-1.DSN
BOOST CONVERTER
TECHNOLOGY
1
01/02/13 12:20:49
12
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
C:\DESIGN\20\2001A-1\2001A-1.DSN
BOOST CONVERTER
TECHNOLOGY
1
01/02/13 12:20:49
12
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
C:\DESIGN\20\2001A-1\2001A-1.DSN
BOOST CONVERTER
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
JOSHUA Y.
PROD
106/11/12
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
JOSHUA Y.
PROD
106/11/12
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
JOSHUA Y.
PROD
106/11/12
E5
PHASMD
E5
PHASMD
C32
0.01uF
C32
0.01uF
E2
VIN+
E2
VIN+
CIN4B
22uF
25V
1812
CIN4B
22uF
25V
1812
E3
VIN
6V - 24V
E3
VIN
6V - 24V
R17 10R17 10
C8
0.1uF
C8
0.1uF
D1
BAS140W
D1
BAS140W
R46
OPT
R46
OPT
COUT5B
22uF
25V
1812
COUT5B
22uF
25V
1812
R15
10K
R15
10K
Q3B
OPT
Q3B
OPT
32
4
5
1
R28
12.1K
1%
R28
12.1K
1%
R5
10
R5
10
JP1
MODE
JP1
MODE
1
3
2
4
R7
OPT
R7
OPT
E9
CLKIN
E9
CLKIN
CIN3A
22uF
25V
1812
CIN3A
22uF
25V
1812
RSNS1
2512
RSNS1
2512
R29
0
R29
0
R47
OPT
R47
OPT
COUT1B
22uF
25V
1812
COUT1B
22uF
25V
1812
R23
0
R23
0
C12
OPT
C12
OPT
Q2A
BSC014N04LSI
Q2A
BSC014N04LSI
32
4
5
1
RSNS3RSNS3
C7
0.1uF
C7
0.1uF
R20
10
R20
10
C11
0.1uF
C11
0.1uF
R4
0
R4
0
+
CIN6
330uF
35V
+
CIN6
330uF
35V
Q1A
BSC014N04LSI
Q1A
BSC014N04LSI
32
4
5
1
E10
EXTVCC
E10
EXTVCC
Q2B
BSC014N04LSI
Q2B
BSC014N04LSI
32
4
5
1
RSNS2
0.003
RSNS2
0.003
COUT5A
22uF
25V
1812
COUT5A
22uF
25V
1812
R2
OPT
R2
OPT
+
COUT3
330uF
35V
+
COUT3
330uF
35V
CIN3B
22uF
25V
1812
CIN3B
22uF
25V
1812
C14
1000pF
C14
1000pF
E14
TO 30A
VOUT
24V / 12VIN
E14
TO 30A
VOUT
24V / 12VIN
R24
232K 1%
R24
232K 1%
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
R27
0
R27
0
R13
OPT
R13
OPT
C2
0.1uF
C2
0.1uF
Q3A
BSC014N04LSI
Q3A
BSC014N04LSI
32
4
5
1
E16
GND
E16
GND
COUT1A
22uF
25V
1812
COUT1A
22uF
25V
1812
R21
0
R21
0
COUT2B
22uF
25V
1812
COUT2B
22uF
25V
1812
+
CIN5
330uF
35V
+
CIN5
330uF
35V
C5
10pF
C5
10pF
C6
OPT
C6
OPT
E8
GND
E8
GND
Q4B
BSC014N04LSI
Q4B
BSC014N04LSI
32
4
5
1
C15
10pF
C15
10pF
R26
22.1K
R26
22.1K
C4
1uF
16V
C4
1uF
16V
E15
GND
E15
GND
R14 0R14 0
E11
GND
E11
GND
R6
10
R6
10
R19
10K
R19
10K
E17
GND
E17
GND
Q4A
BSC014N04LSI
Q4A
BSC014N04LSI
32
4
5
1
R10
OPT
R10
OPT
R1
100K
R1
100K
R9
0
R9
0
L1
1.0uH
COILCRAFT
SER2010-102ML
L1
1.0uH
COILCRAFT
SER2010-102ML
C13
10pF
C13
10pF
CIN1B
22uF
25V
1812
CIN1B
22uF
25V
1812
JP2
ON
OFF
RUN
JP2
ON
OFF
RUN
1
3
2
R22
38.3K
1%
R22
38.3K
1%
E13
VOUT+
E13
VOUT+
E4
GND
E4
GND
E12
RUN
E12
RUN
+
COUT6
330uF
35V
+
COUT6
330uF
35V
C3
OPT
C3
OPT
R16
OPT
R16
OPT
Q1B
OPT
Q1B
OPT
32
4
5
1
C16
0.01uF
C16
0.01uF
COUT4B
22uF
25V
1812
COUT4B
22uF
25V
1812
C10
0.01uF
C10
0.01uF
CIN2B
22uF
25V
1812
CIN2B
22uF
25V
1812
R8
0
R8
0
RSNS4
0.003
2512
RSNS4
0.003
2512
R25
12.1K
1%
R25
12.1K
1%
CIN2A
22uF
25V
1812
CIN2A
22uF
25V
1812
R12
0
R12
0
R18
0
R18
0
C1
0.01uF
C1
0.01uF
D2
BAS140W
D2
BAS140W
R3
OPT
R3
OPT
E1
PGOOD
E1
PGOOD
CIN4A
22uF
25V
1812
CIN4A
22uF
25V
1812
CIN1A
22uF
25V
1812
CIN1A
22uF
25V
1812
E6
GND
E6
GND
E18E18
E19E19
C9
4.7uF
25V
0805
C9
4.7uF
25V
0805
COUT2A
22uF
25V
1812
COUT2A
22uF
25V
1812
R11
2.2
R11
2.2
L2
1.0uH
COILCRAFT
SER2010-102ML
L2
1.0uH
COILCRAFT
SER2010-102ML
COUT4A
22uF
25V
1812
COUT4A
22uF
25V
1812
7
dc2001af
DEMO MANUAL DC2001A
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
SLAVE
SENSE4+
SENSE3+
SENSE3-
SENSE4-
SGND
TECHNOLOGY
1
12/17/12 06:13:00
22
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
BOOST CONVERTER
TECHNOLOGY
1
12/17/12 06:13:00
22
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
BOOST CONVERTER
TECHNOLOGY
1
12/17/12 06:13:00
22
HIGH CURRENT 4-PHASE SYNCHRONOUS
MI/RB
N/A
LTC3787EUFD
DEMO CIRCUIT 2001A
BOOST CONVERTER
C19
0.1uF
C19
0.1uF
D4
BAS140W
D4
BAS140W
R48
OPT
R48
OPT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
R42
0
R42
0
C18
OPT
C18
OPT
R43
0
R43
0
Q7B
OPT
Q7B
OPT
32
4
5
1
C33
0.01uF
C33
0.01uF
Q5B
OPT
Q5B
OPT
32
4
5
1
R45
22.1K
R45
22.1K
CIN10A
22uF
25V
1812
CIN10A
22uF
25V
1812
R40
0
R40
0
RSNS7
0.003
2512
RSNS7
0.003
2512
R35
2.2
R35
2.2
RSNS5
2512
RSNS5
2512
COUT11A
22uF
25V
1812
COUT11A
22uF
25V
1812
D3
BAS140W
D3
BAS140W
C27
0.1uF
C27
0.1uF
COUT10B
22uF
25V
1812
COUT10B
22uF
25V
1812
COUT8B
22uF
25V
1812
COUT8B
22uF
25V
1812
R41
10
R41
10
CIN7B
22uF
25V
1812
CIN7B
22uF
25V
1812
C25
4.7uF
25V
0805
C25
4.7uF
25V
0805
R38
0
R38
0
R32
10
R32
10
R30
0
R30
0
R36
100
R36
100
COUT7A
22uF
25V
1812
COUT7A
22uF
25V
1812
RSNS8RSNS8
Q7A
BSC014N04LSI
Q7A
BSC014N04LSI
32
4
5
1
R33
0
R33
0
+
COUT12
330uF
35V
+
COUT12
330uF
35V
E7
CLKOUT
E7
CLKOUT
R37 0
R37 0
Q8A
BSC014N04LSI
Q8A
BSC014N04LSI
32
4
5
1
+
CIN11
330uF
35V
+
CIN11
330uF
35V
Q6A
BSC014N04LSI
Q6A
BSC014N04LSI
32
4
5
1
+
COUT9
330uF
35V
+
COUT9
330uF
35V
C22
10pF
C22
10pF
C20
OPT
C20
OPT
C31
0.01uF
C31
0.01uF
COUT8A
22uF
25V
1812
COUT8A
22uF
25V
1812
COUT11B
22uF
25V
1812
COUT11B
22uF
25V
1812
CIN7A
22uF
25V
1812
CIN7A
22uF
25V
1812
Q5A
BSC014N04LSI
Q5A
BSC014N04LSI
32
4
5
1
C29
10pF
C29
10pF
R44
0
R44
0
L3
1.0uH
COILCRAFT
SER2010-102ML
L3
1.0uH
COILCRAFT
SER2010-102ML
R39 10R39 10
C30
1000pF
C30
1000pF
C28
OPT
C28
OPT
Q8B
BSC014N04LSI
Q8B
BSC014N04LSI
32
4
5
1
CIN10B
22uF
25V
1812
CIN10B
22uF
25V
1812
R34
OPT
R34
OPT
Q6B
BSC014N04LSI
Q6B
BSC014N04LSI
32
4
5
1
C26
0.01uF
C26
0.01uF
+
CIN12
330uF
35V
+
CIN12
330uF
35V
L4
1.0uH
COILCRAFT
SER2010-102ML
L4
1.0uH
COILCRAFT
SER2010-102ML CIN8A
22uF
25V
1812
CIN8A
22uF
25V
1812
COUT10A
22uF
25V
1812
COUT10A
22uF
25V
1812
C17
0.01uF
C17
0.01uF
C21
1uF
16V
C21
1uF
16V
CIN9B
22uF
25V
1812
CIN9B
22uF
25V
1812
R49
OPT
R49
OPT
C24
0.1uF
C24
0.1uF
RSNS6
0.003
RSNS6
0.003
COUT7B
22uF
25V
1812
COUT7B
22uF
25V
1812
R31 10R31 10
CIN9A
22uF
25V
1812
CIN9A
22uF
25V
1812
CIN8B
22uF
25V
1812
CIN8B
22uF
25V
1812
C23
0.1uF
C23
0.1uF
8
dc2001af
DEMO MANUAL DC2001A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0113 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 LT C 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
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
