Linear Technology DC1403A Quick setup guide

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DC1403A
ANALOG DEVICES
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1
dc1403af
DEMO MANUAL DC1403A
PARAMETER CONDITION VALUE
Minimum Input Voltage 7V
Maximum Input Voltage 36V
Output Voltage VOUT1 V
IN = 7V ~ 36V 5V ±3%
Output Voltage VOUT2 VIN = 7V ~ 36V 3.3V ±3%
Switching Frequency 400kHz ±10%
Maximum Output Current IOUT1 VIN = 7V ~ 36V 3A
Maximum Output Current IOUT2 VIN = 7V ~ 36V 3A
Voltage Ripple VOUT1 VIN = 12V, IOUT1 = 3A < 20mV
Voltage Ripple VOUT2 VIN = 12V, IOUT2 = 3A < 20mV
DESCRIPTION
LT3692A
Monolithic Dual Tracking 3.5A
Step-Down Switching Regulator
Demonstration circuit 1403A is a dual current mode PWM
step-down DC/DC converter featuring the LT3692A. The
demo circuit is designed for 5V and 3.3V outputs from a
7V to 36V input. The current capability of each channel is
up to 3A. Individual soft-start, current limit, comparator,
input voltage for each output as well as frequency division
and synchronous and clock output functions simplify the
complex design of dual-output power converters.
Both converters are synchronized to either a common
external clock input or a resistor-programmable 250kHz
to 2.25MHz internal oscillator. At all frequencies, a 180°
phase shift between channels is maintained, reducing
EFFICIENCY GRAPH
voltage ripple. Programmable frequency allows optimi-
zation between efficiency and external component size.
Each output can be independently disabled using its
own SHDN pin and be placed in a low quiescent current
shutdown mode.
The LT3692A data sheet gives complete description of the
device, operation and application information. The data
sheet must be read in conjunction with this quick start
guide for demo circuit 1403A.
Design files for this circuit board are available at
http://www.linear.com/demo
Figure 1. Efficiency vs Load Current
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
LOAD CURRENT (A)
0.3
EFFICIENCY (%)
90
95
2.4
85
80
0.9 1.5
0.6 1.2 1.8 2.7
2.1 3.0
65
60
75
100
70
dc1403a F01
VOUT1 = 5V
VOUT2 = 3.3V
VIN = 12V
f = 400kHz
PERFORMANCE SUMMARY
Specifications are at TA= 25°C

2
dc1403af
DEMO MANUAL DC1403A
QUICK START PROCEDURE
Demo circuit 1403A is easy to set up to evaluate the per-
formance of the LT3692A. Refer to Figure 2 for proper
measurement equipment setup and follow this procedure:
NOTE. When measuring the input or output voltage ripple,
care must be taken to avoid a long ground lead on the
oscilloscope probe. Measure the input or output voltage
ripple by touching the probe tip directly across the VIN
or VOUT and GND terminals. See Figure 3 for the proper
scope probe technique.
1. Place JP1 on the SINGLE position.
2. With power off, connect the input power supply to VIN1
and GND. If DUAL is selected, connect another input
power supply to VIN2 and GND.
3. Turn on the power at the input.
NOTE. Ensure that the input voltage does not exceed 36V.
4. Check for the proper output voltages.
NOTE. If there is no output, temporarily disconnect the
load to ensure that the load is not set too high.
5. Once the proper output voltages are established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
Figure 2. DC1403A Proper Equipment Setup

3
dc1403af
DEMO MANUAL DC1403A
QUICK START PROCEDURE
GND VIN
dc1403a F03
ADDITIONAL NOTES
If an EMI filter is desired on VIN1, it can be feasibly in-
stalled on the back of the board in the optional circuit area.
However, a trace cut is required for the insertion of the
optional circuit. See Figure 4 for the cut line.
Figure 3. Measuring Input or Output Ripple
Figure 4. Cut Line for the EMI Filter Installation
CUT LINE
CU
CU
C
dc1403a F04

4
dc1403af
DEMO MANUAL DC1403A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C2, C3 CAP, 1210 4.7μF 10% 50V X7R MURATA GRM32ER71H475KA88L
2 2 C4, C5 CAP, 0603 0.47μF 10% 25V X7R MURATA GRM188R71E474KA12D
3 2 C7, C8 CAP, 1210 100μF 20% 10V X5R TAIYO YUDEN LMK325ABJ107MM-T
4 2 C10, C11 CAP, 0402 22pF 10% 25V NPO AVX 04023A220KAT2A
5 2 C12, C13 CAP, 0402 0.1μF 10% 16V X7R TDK C1005X7R1C104K
6 2 C14, C15 CAP, 0402 680pF 10% 25V X7R AVX 04023C681KAT2A
7 2 C16, C17 CAP, 0402 33pF 10% 25V NPO AVX 04023A330KAT
8 1 C24 CAP, 0402 10nF 10% 16V X7R MURATA GRM155R71C103KA01D
9 2 D1, D5 DIODE, SCHOTTKY SOD323 CENTRAL SEMI CMDSH-4E
10 2 D2, D4 DIODE, SCHOTTKY RECTIFIER SMA DIODES INC. B340A
11 1 L1 IND, 6.8μH NIC NPIM74C6R8MTRF
12 1 L2 IND, 4.7μH NIC NPIM74C4R7MTRF
13 2 R1, R2 RES, 0402 1k Ωs 1% 1/16W VISHAY CRCW04021K00FKED
14 1 R5 RES, 0402 42.2k Ω 1% 1/16W VISHAY CRCW040242K2FKED
15 1 R6 RES, 0402 24.9k Ωs 1% 1/16W VISHAY CRCW040224K9FKED
16 2 R7, R8 RES, 0402 100k Ω 5% 1/16W VISHAY CRCW0402100KJNED
17 2 R9, R10 RES, 0402 8.06k Ω 1% 1/16W VISHAY CRCW04028K06FKED
18 2 R11, R12 RES, 0402 100k Ω 1% 1/16W VISHAY CRCW0402100KFKED
19 2 R13, R14 RES, 0402 30k Ωs 1% 1/16W NIC NRC04F3002TRF
20 1 R15 RES, 0402 10.2k Ωs 1% 1/16W VISHAY CRCW040210K2FKED
21 1 R16 RES, 0402 20k Ω 1% 1/16W VISHAY CRCW040220K0FKED
22 1 R17 RES, 0402 40.2k Ω 1% 1/16W VISHAY CRCW040240K2FKED
23 1 U1 IC, STEP-DOWN REGULATOR LINEAR TECH LT3692AEFE
Additional Demo Board Circuit Components
1 2 C1, C21 CAP, 22μF 20% 50V OSCON SUNCON 50CE22BS
2 0 C6, C9 CAP, 0805 10μF 10% 16V X5R OPTION MURATA GRM21BR61C106KE15L OPTION
3 0 C18 CAP, 22μF 20% 50V OSCON OPTION SANYO 50CE22BS OPTION
4 0 C19 CAP, 0603 0.01μF 10% 50V X7R OPTION AVX 06035C103KAT2A OPTION
5 0 C20 CAP, 1210 2.2μF 10% 50V X7R OPTION MURATA GRM32ER72A225KA35L OPTION
6 0 C25 CAP, 0402 10nF 10% 16V X7R OPTION MURATA GRM155R71C103KA01D OPTION
7 0 D3, D6 DIODE, SCHOTTKY SOD323 OPTION CENTRAL SEMI CMDSH-4E OPTION
8 0 D7, D8 DIODE, OPT OPTION
9 0 FB1 FERRITE BEAD OPTION TAIYO YUDEN FBMJ3216HS800 OPTION
10 0 L3 IND, 22μH OPTION VISHAY IHLP4040DZ-01 OPTION
Hardware for Demo Board Only
1 1 JP1 HEADER, 4-PIN SAMTEC TMM-104-02--L-S
2 8 TP1, TP2, TP5-TP8, TP16,
TP17
TURRET MILL-MAX 2501-2-00-80-00-00-07-0
3 9 TP3, TP4, TP9-TP15 TURRET MILL MAX 2308-2-00-80-00-00-07-0
4 1 JP1 SHUNT, 2mm SAMTEC 2SN-BK-G

5
dc1403af
DEMO MANUAL DC1403A
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
Figure 5. Demo Circuit Schematic
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
9$
NOTES: UNLESS OTHERWISE SPECIFIED,
OPT OPT
237,21$/&,5&8,7
237
237
237 237
237
OPT
(400kHz)
1. ALL CAPACITORS AND RESISTORS ARE 0402.
OPT
[2] SEE QUICK START GUIDE FOR DETAILS ON JP1 SETTING AND INPUT VOLTAGE IMPLEMENTATION ORDER.
[2] [2]
OPT
VOUT1 VOUT2
VOUT1
VIN1
VIN1 VIN2VOUT1
VIN1 VIN1
VIN2
VOUT2
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DEMO CIRCUIT 1403A
CONVERTER
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DEMO CIRCUIT 1403A
CONVERTER
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
EDWIN L.IC Change
302/23/11
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
EDWIN L.IC Change
302/23/11
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
EDWIN L.IC Change
302/23/11
D5
CMDSH-4E
D5
CMDSH-4E
L3
IHLP4040DZ-01
22uHL3
IHLP4040DZ-01
22uH
R8 100K R8 100K
L1
6.8uH
L1
6.8uH
+
C1 22uF 50V
+
C1 22uF 50V
C3 4.7uF 50V 1210 C3 4.7uF 50V 1210
C14 680pFC14 680pF
C16 33pFC16 33pF R9 8.06K 1%R9 8.06K 1% C4 0.47uF
0603
C4 0.47uF
0603
C10 22pF C10 22pF
R16 20k 1% R16 20k 1%
TP4
SHDN2
TP4
SHDN2
TP6
VOUT2
TP6
VOUT2
C12 0.1uF C12 0.1uF
C24
10nF
C24
10nF
R12 100K 1%R12 100K 1%
D6
CMDSH-4E
D6
CMDSH-4E
TP13
SYNC
TP13
SYNC
D7 OPT D7 OPT
R6
24.9K
1% R6
24.9K
1%
TP5
VOUT1
9$
TP5
VOUT1
9$
TP10
CMPO2
TP10
CMPO2
TP1
VIN1
TP1
VIN1
L2
4.7uH
L2
4.7uH
TP14
CLKOUT
TP14
CLKOUT
D3
CMDSH-4E
D3
CMDSH-4E
TP16
VIN2
TP16
VIN2
C2 4.7uF 50V
1210
C2 4.7uF 50V
1210
TP12
SS2
TP12
SS2
D2
B340A
D2
B340A
+
C21 22uF 50V
+
C21 22uF 50V
C11
22pF
C11
22pF
R17 40.2k 1% R17 40.2k 1%
TP17
GND
TP17
GND
R11 100K 1%R11 100K 1%
R2
1k
1% R2
1k
1%
10uF C6 16V
0805
10uF C6 16V
0805
+
C18 22uF 50V
+
C18 22uF 50V
TP15
TEMP
TP15
TEMP
R5 42.2K 1% R5 42.2K 1%
10uF C9 16V 0805 10uF C9 16V 0805
R1
1k 1%
R1
1k 1%
R10 8.06K 1%R10 8.06K 1%TP9
CMPO1
TP9
CMPO1
100uF C7 10V 1210 100uF C7 10V 1210
R15
10.2k
1%
R15
10.2k
1%
D1 CMDSH-4E D1 CMDSH-4E
D8 OPT D8 OPT
FB1
FBMJ3216HS800
BEADFB1
FBMJ3216HS800
BEAD
R14 30k 1% R14 30k 1%
100uF C8 10V
1210
100uF C8 10V
1210
TP3
SHDN1
TP3
SHDN1
TP8
GND
TP8
GND
C17 33pFC17 33pF
R13 30k 1% R13 30k 1%
C5 0.47uF
0603
C5 0.47uF
0603
R7 100K R7 100K
JP1
SINGLE DUAL
INPUT MODE
CASCADE
JP1
SINGLE DUAL
INPUT MODE
CASCADE
1 3 2 4
TP7
GND
TP7
GND
C13 0.1uF C13 0.1uF
U1
LT3692AEFE
U1
LT3692AEFE
SW1
38
DIV
27
VC2 26
SS2 24
FB1
9FB2 11
CMPI2 12
CMPO2 13
BST2 14
CMPI1
8
IND2 18
SW2 20
VIN2 22
SHDN2 23
VOUT2 16
CMPO1
7
BST1
6
ILIM1
33
TJ 28
CLKOUT 29
RT/SYNC
30
VC1
32
VOUT1
4
SHDN1
35
VIN1 36
PGND
39
SS1
34
IND1
2
ILIM2 25
NC
10
NC
15
NC 21 NC 31
NC
1
NC
3
NC
5
NC 17 NC 19 NC 37
TP11
SS1
TP11
SS1
C15 680pFC15 680pF
R18
OPT
R18
OPT
C20 2.2uF
50V
1210 C20 2.2uF
50V
1210
D4 B340A D4 B340A
C25
10nF
C25
10nF
C19
0.01uF
0603
C19
0.01uF
0603
TP2
GND
TP2
GND

6
dc1403af
DEMO MANUAL DC1403A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0711 • 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
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 LTC 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. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC 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 LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation