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DESCRIPTION
DEMO MANUAL DC1194A
LTM8020
36V, 200mA DC/DC
µModule Regulator
Demonstration circuit DC1194A features the LTM®8020, a
®
200mA DC/DC step-down μModule
regulator. The board
is preset to deliver a 3.3V output at up to 200mA load
current from an input voltage of up to 36V. The output
voltage may be modified by simply changing one resistor. The LTM8020 data sheet must be read in conjunction
with this demo manual prior to working on or modifying
demo circuit DC1194A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
PARAMETER CONDITIONS / NOTES VALUE
Input Voltage Range V
Output Voltage, V
Maximum Output Current 200mA
Efficiency V
Light Load Power Loss V
R1 = 30.1k 3.3V
OUT
= 3.3V, Device 0perating 4.5V to 36V
OUT
= 5V, V
IN
= 12V, V
IN
OUT
OUT
= 3.3V, I
= 3.3V, I
= 100mA 85% (See Figure 2)
OUT
= 100μA 400μW
OUT
BOARD PHOTO
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DEMO MANUAL DC1194A
DESCRIPTION
90
80
70
60
50
40
EFFICIENCY (%)
30
20
10
0
0.1 10 100 1000
1
I
(mA)
LOAD
5V
12V
24V
36V
DC1194A F01
Figure 1. LTM8020EV Efficiency 3.3V
1000
100
10
POWER LOSS (mW)
IN
IN
IN
IN
OUT
6.0
5.5
5.0
TO START
SHDN CONTROL
1
0.1
0.1 10 100 1000
1
I
(mA)
OUT
Figure 2. LTM8020EV Power Loss 3.3V
5V
IN
12V
24V
36V
DC1194A F02
IN
IN
IN
OUT
4.5
4.0
INPUT VOLTAGE (V)
3.5
3.0
0
TO RUN
50 100 150 200
LOAD CURRENT (mA)
DC1194A F03
Figure 3. LTM8020EV Typical Minimum VIN 3.3V
OUT
2
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QUICK START PROCEDURE
DEMO MANUAL DC1194A
Demonstration circuit 1194A is easy to set up to evaluate the performance of the LTM8020. Refer to Figure 4
for proper measurement equipment setup and follow the
procedure below:
NOTE: Do not hot-plug the V
voltage. The absolute maximum voltage on V
terminal at high input
IN
is 40V
IN
and hot-plugging a power supply through wire leads to
the demonstration circuit can cause the voltage on the
extremely low ESR ceramic input capacitor to ring to
twice its DC value. In order to protect the IC, a higher
ESR aluminum electrolytic capacitor is placed at the input
terminals. This may protect against some, but not all, input
transients due to hot-plugging with a power supply. See
Application Note 88 for more details.
–
A
+
+
V
–
+
–
1. Connect the power supply (with power off), load, and
meters as shown in Figure 4.
2. After all connections are made, turn on input power
and verify that the output voltage is 3.3V.
NOTE: If the output voltage is too low, temporarily
disconnect the load to make sure that the load is not
set too high.
3. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
–+
A
+
+
V
LOAD
–
–
OPTIONAL
DC1194A F04
Figure 4. Proper Measurement Equipment Setup
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DEMO MANUAL DC1194A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER’S PART NUMBER
Required Circuit Components
1 1 C1 CAP, 1210 2.2μF 10% 50V X7R TDK C3225X7R1H225K
5 1 R1 RES, 0402 301k 1% 1/16W VISHAY CRCW0402301KFKED
6 1 R2 RES, 0402 100k 5% 1/16W VISHAY CRCW0402100KJNED
7 1 U1 IC, MODULE LINEAR TECH. LTM8020EV#PBF
Optional Electrical Components
2 1 C2 CAP, 0805 22μF 20% 6.3V X7R TAIYO YUDEN JDK212BJ226MD-T
3 1 C3 CAP, 10μF 20% 50V ALUM SANYO 50CE10BJ (Now SUNCON 50CE10BJ)
Hardware
4 6 E1, E2, E3, E4, E5, E6 TURRET MILL-MAX 2501-2-00-80-00-00-07-0
4
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SCHEMATIC DIAGRAM
DEMO MANUAL DC1194A
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.
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DEMO MANUAL DC1194A
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
Linear Technology Corporation
6
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
dc1194af
LT 0311 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2011
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