Linear Technology DC2434A Quick setup guide

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dc2434af
DEMO MANUAL DC2434A
Description
LTC3864
60V Low IQ Step-Down DC/DC Converter
with 100% Duty Cycle Capability
Demonstration circuit 2434A is a high voltage, current-
modeDC/DCstep-downconverterfeaturingtheLT C
®
3864.
The board operates from an input range of 6V to 60V and
provides a 12V, 5A output when the input exceeds 12V.
The PMOSFET architecture allows it to operate seamlessly
up to 100% duty cycle and function as a saturated switch
below the regulation threshold, down to 6VIN. It operates
at 200kHz and may be synchronized to an external clock.
A soft-start feature controls output voltage slew rate at
start-up, reducing current surge and voltage overshoot.
Burst Mode
®
operation that improves efficiency at light 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
loads can be enabled with a jumper. A power good output
signal is provided.
This board is suitable for a wide range of automotive,
telecom, industrial and other applications. The LTC3864
is available in small 12-pin thermally enhanced MSOP and
DFN packages. For other output requirements, see the
LTC3864 data sheet or contact the LTC factory.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2434A
Specifications are at TA= 25°C
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 6 60 V
VOUT Output Voltage 12 V
IOUT Output Current Range, Continuous Free Air 0 5 A
fSW Switching (Clock) Frequency 200 kHz
VOUT(P-P) Output Ripple VIN = 14V, IOUT = 5A (20MHz BW) 45 mVP–P
IREG Output Regulation Line and Load (13VIN to 60VIN, 0.1AOUT to 5AOUT) ±0.4 %
POUT/PIN Efficiency (see Figure 3) VIN =14V, IOUT = 5A 97.0 %
Approximate Size Component Area x Top Component Height 1.3 × 1.0 × 0.39 Inches

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dc2434af
DEMO MANUAL DC2434A
Quick start proceDure
Demonstration circuit 2434 is easy to set up to evaluate
the performance of the LTC3864. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
NOTE. When measuringthe output voltageripple, care must
be taken to avoid a long ground lead on the oscilloscope
probe. Measure the output voltage ripple by touching the
probe tip and ground ring directly across the last output
capacitor as shown in Figure 1.
1. Set an input power supply that is capable of 6V to 60V
to 13V. Then turn off the supply.
2. Withpoweroff, connect the supply to theinputterminals
+VIN and GND.
a. Input voltages lower than 6V can keep the converter
from turning on due to the undervoltage lockout
feature of the LTC3864.
b. If efficiency measurements are desired, an ammeter
capable of measuring 5ADC or a resistor shunt can
be put in series with the input supply in order to
measure the DC2434A’s input current.
c. A voltmeter with a capability of measuring at least
60V can be placed across the input terminals in order
to get an accurate input voltage measurement.
3. Turn on the power at the input.
NOTE. Make sure that the input voltage never exceeds 60V.
4. Check for the proper output voltage of 12V. Turn off
the power at the input.
5. Oncethe proper output voltage is established, connect a
variable load capable of sinking 5A at 12V to the output
terminals +VOUT and GND. Set the current for 0A.
a. If efficiency measurements are desired, an ammeter
or a resistor shunt that is capable of handling 5ADC
can be put in series with the output load in order to
measure the DC2434A’s output current.
b. A voltmeter with a capability of measuring at least
12V can be placed across the output terminals in
ordertoget an accurate output voltage measurement.
6. Turn on the power at the input.
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
7. Once the proper output voltage is again established,
adjust the load and/or input within the operating range
and observe the output voltage regulation, ripple volt-
age, efficiency and other desired parameters.
Figure 1. Proper Measurement Equipment Setup
DC2434 F01
+–
VOUT
IOUT
VIN VIN
IIN
+–
LOAD
+
–
+
–
+
–
+
–

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dc2434af
DEMO MANUAL DC2434A
Quick start proceDure
Figure 2. Efficiency with Burst Mode Operation at Light Loads
Figure 3. Output Ripple at 28VIN and 5AOUT (50mV, 5µs/Div, 20MHz)
Figure 4. Transient Response Waveform at 14VIN and 2.5A–5A–2.5AOUT (2A, 200mV, 200µs/Div)
IOUT (A)
EFFICIENCY (%)
DC2434 F02
70
75
80
85
90
95
100
0.1
10
1
VIN = 14V
VIN = 28V
5µs/DIV
50mV/DIV
DC2434 F03
200µs/DIV
2.00A/DIV
200mV/DIV
DC2434 F04

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dc2434af
DEMO MANUAL DC2434A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CIN1, CIN2 CAP., ALUM, 22µF, 63V 6.3x7.7 PANASONIC, EEHZA1J220XP
2 3 CIN3, CIN4, CIN5 CAP., X7S, 4.7µF, 100V, 10%, 1210 MURATA, GRM32DC72A475KE01
3 2 COUT1, COUT2 CAP., X7R, 10µF, 16V, 10%, 1206 MURATA, GRM31CR71C106KA12
4 1 COUT3 CAP., ALUM 56µF, 25V 6.3x5.8 PANASONIC, EEHZA1E560P
5 1 C3 CAP., NPO, 1000pF, 50V, 10%, 0603 AVX, 06035A102KAT2A
6 1 C4 CAP., X7R, 0.47µF, 16V, 10%, 0603 MURATA, GCM188R71C474KA55L 
7 1 C5 CAP., X7R, 0.1µF, 100V, 10%, 0805 MURATA, GRM21BR72A104KAC4
8 1 C7 CAP., X7R, 0.1µF, 50V, 10%, 0603 MURATA, GCM188R71H104KA57D 
9 1 C8 CAP., COG, 3300pF, 50V, 5%, 0603 MURATA, GCM1885C1H332JA16D 
10 1 C9 CAP., COG, 330pF, 50V, 5%, 0603 MURATA, GCM1885C1H331JA16D 
11 1 C10 CAP., COG, 10pF, 50V, 5%, 0603 MURATA, GCM1885C1H100JA16D 
12 1 D1 SCHOTTKY DIODE, 60V, 10A, DFN5-SO-8FL ON SEMI, NRVB860MFST1G
13 1 L1 INDUCTOR, 15µH COILCRAFT, XAL1510-153
14 1 Q1 FET, P-CHAN., 100V, PowerPak SO-8 FAIRCHILD, FDMS86163P
15 1 R1 RES., 100kΩ, 1/8W, 1%, 0805 VISHAY, CRCW0805100KFKEA
16 1 R2 RES., 21.5kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060321K5FKEA
17 1 R5 RES., 100Ω, 1/10W, 1%, 0603 VISHAY, CRCW0603100RFKEA
18 1 R7 RES., 13mΩ, 1W, 1%, 0612 PANASONIC, ERJ-B2CFR013V
19 1 R9 RES., 37.4kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060337K4FKEA
20 1 R10 RES., 10kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA
21 1 R11 RES., 464kΩ, 1/10W, 1%, 0603 VISHAY, CRCW0603464KFKEA
22 1 R12 RES., 33.2kΩ, 1/10W, 1%, 0603 VISHAY, CRCW060333K2FKEA
23 1 R13 RES., 1.0kΩ, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA
24 1 R14 RES., 100kΩ, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA
25 1 U1 IC, LTC3864EMSE MSE12 LINEAR TECH.CORP. LTC3864EMSE#PBF
Additional Demo Board Circuit Components
1 0 C1 CAP., OPT 0603 OPT
2 0 C2 CAP., OPT 0805 OPT
3 0 D2 SCHOTTKY DIODE, OPT, SOD323 OPT
4 0 R6, R15 RES., OPT, 0603 OPT
5 1 R4 RES., 0Ω, 1/16W, 0603 VISHAY, CRCW06030000Z0EA
Hardware: For Demo Board Only
1 8 E1, E2, E3, E4, E5, E6,
E7, E8
TESTPOINT, TURRET, .094" MILL MAX, 2501-2-00-80-00-00-07-0
2 1 JP1 CONN., HEADER, 1X3, 2mm WURTH ELEKTRONIK, 62000311121
3 1 JP2 CONN., HEADER, 2X3, 2mm WURTH ELEKTRONIK, 62000621121
4 2 XJP1, XJP2 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421
5 4 J1, J2, J3, J4 CONN, BANANA JACK, KEYSTONE 575-4
6 4 MTGS AT 4 CORNERS STAND-OFF, SNAP ON NYLON 0.50" tall KEYSTONE, 8833

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dc2434af
DEMO MANUAL DC2434A
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
NOTE: UNLESS OTHERWISE SPECIFIED
100V
1W
16V 100V
16V
8A
XAL1510-153
60V
12V / 5A
1. ALL RESISTORS AND CAPACITORS ARE 0603.
6.3x7.7 63V
6.3x5.8 25V
DEMO CIRCUIT DC2434A
GND
GND
VIN
VOUT
12V - 60V
CAUTION, SHOCK HAZARD: CONTACT WITH HIGH VOLTAGE
CAN RESULT IN A DANGEROUS ELECTRIC SHOCK.
6.3x7.7
SW
VIN
GND
GND
100V
VOUT
CIN1,2 Panasonic EEHZA1J220XP COUT4 Panasonic EEHZA1E560P COUT1 muRata GCM32DR71C106KA37 R1 SUSUMU PRL1632-R013-F-T1 L1 COILCRAFT XAL1510-153
63V
(6V Min)
Q
SDN
CLKIN
PGOOD
VOUT
VIN
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DBPRODUCTION2 10-10-16
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DBPRODUCTION2 10-10-16
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DBPRODUCTION2 10-10-16
__
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
Monday, October 10, 2016
11
60V, LOW I , STEP-DOWN CONTROLLER
LT
DB
N/A
LTC3864EMSE
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
Monday, October 10, 2016
11
60V, LOW I , STEP-DOWN CONTROLLER
LT
DB
N/A
LTC3864EMSE
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
Monday, October 10, 2016
11
60V, LOW I , STEP-DOWN CONTROLLER
LT
DB
N/A
LTC3864EMSE
L1
15uH
C10 10pF
J2
R15 OPT
C5 0.1uF 0805
E6
+
COUT3 56uF
E3
R4 0
R13 1K
C1 OPT
R12 33.2K
C7 0.1uF
E4
E7
+
CIN2 22uF
R11 464K
R7 13m 0612
J1
Q1
FDMS86163P
4
1
5
2
3
6
7
8
E9
GATE
R1
100K
0805
C3 1nF
COUT1
10uF 1206
C2 OPT 0805
D2 OPT
R2
21.5K
R6 OPT
CIN4 4.7uF 1210 CIN3 4.7uF 1210
E1
J3
COUT2
E8
CIN5 4.7uF 1210
R5 100
J4
E2
C9 330pF
D1 NRVB860MFS
U1
LTC3864EMSE
VFB
5
SS
4
GND
3
FREQ
2
PLL/MODE
1
GND
13
SENSE 10
CAP 9
RUN 8
PGOOD 7
ITH
6
VIN 11
GATE 12
+
CIN1 22uF
C8 3.3nF
E5
R9 37.4K
JP2
BURST CLKIN
SKIP
MODE
1 3
2 4 6 5
C4
0.47uF
JP1
ON
OFF
SHDN
1 3 2
R14 100K
R10 10K
CAP
FREQ

6
dc2434af
DEMO MANUAL DC2434A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 1216 • 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 application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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