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DEMO MANUAL DC1386B
DESCRIPTION
LTM8032 Ultralow EMI,
36V, 2A DC/DC
µModule Regulator
Demonstration circuit 1386 features the LTM
®
8032, a
2A EN55022 Class B certifi ed step-down converter. This
μModule
®
regulator is confi gured to deliver a 3.3V output
from an input voltage between 5.5V to 36V at a switching
frequency of 600kHz. The wide input range of the LTM8032
allows a variety of input sources. Under light load condi-
tions, the available Burst Mode
®
operation supports high
effi ciency with low output ripple. L, LT, LTC, LTM, Linear Technology, Burst Mode, μModule and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
PARAMETER CONDITION VALUE
Input Voltage Range 5.5V to 36V
Output Voltage VOUT 3.3V
Maximum Output Current 2A
Typical Switching Frequency 600kHz
BOARD PHOTO
PERFORMANCE SUMMARY
The LTM8032 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this manual to
modify demo circuit 1386.
Design fi les for this circuit board are available at
http://www.linear.com/demo
(TA = 25°C)
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DEMO MANUAL DC1386B
QUICK START PROCEDURE
Demonstration circuit 1386 is easy to set up to evaluate
the performance of the LTM8032. Refer to Figure 1 for
proper measurement equipment setup and follow the
procedure below:
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 2 for proper scope
probe technique.
1. Place JP1 on the ON position.
2. With power off, connect the input power supply to VIN
and GND.
3. Turn on the power at the input.
NOTE. Make sure that the input voltage does not exceed
the maximum input voltage.
4. Check for the proper output voltage.
NOTE. If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
5. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, effi ciency and
other parameters.
Figure 1. Proper Measurement Equipment Setup
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DEMO MANUAL DC1386B
QUICK START PROCEDURE
Figure 2. Measuring Input or Output Ripple
GNDVIN
Figure 3. Effi ciency
OUTPUT CURRENT (A)
0.01
0
EFFICIENCY (%)
20
30
40
50
60
70
0.1 1
1386 F03
80
90
100
10
10
5.5VIN
12VIN
24VIN
36VIN
PARTS LIST
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 Cap, X7R, 2.2μF, 50V, 10%,1206 Murata GCM31CR71H225KA55L
2 1 CIN1 Cap, 22μF, 50V Sanyo 50CE22BS
3 1 C3 Cap, X5R, 22μF, 10V, 20%, 1206 AVX 1206ZD226MAT2A
4 1 C4 Cap, X7R, 0.1μF, 50V, 10%, 0603 AVX 06035C104KAT2A
5 1 R1 Res, 54.9k, 1%, 1/16W, 0603 Vishay CRCW060354K9FKEA
6 1 R2 Res, 78.7k, 1%, 1/16W, 0603 Vishay CRCW060378K7FKEA
7 2 R3, R5 Res, 100k, 1%, 1/16W, 0603 Vishay CRCW0603100KFKED
8 1 R4 Res, 10k, 5%, 1/16W, 0603 Vishay CRCW060310K0JNED
9 1 U1 IC, LTM8032EV, μModule Linear Technology LTM8032EV#PBF
Additional Demo Board Circuit Components
1 0 C10 (OPT) Cap, 1206
2 0 C11 (OPT) Cap, 22μF, 50V
3 0 L1 (OPT) Ind, High Current, Size 2525
Hardware for Demo Board Only
1 9 E1 to E9 Turret Mill-Max 2501-2-00-80-00-00-07-0
2 1 JP1 Header, 3 Pin 2mm Samtec TMM-103-02-L-S
3 1 Shunt Shunt, 2mm Samtec 2SN-BK-G
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DEMO MANUAL DC1386B
SCHEMATIC DIAGRAM
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DEMO MANUAL DC1386B
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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
A 04/11 Updated Board Photo
Updated Figure 1
Updated Schematic Diagram
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DEMO MANUAL DC1386B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2010
LT 0411 REV A • 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 direc-
tive 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:
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1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
