Linear Technology DC1696 Quick setup guide

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dc1696f
DEMO MANUAL DC1696
DESCRIPTION
LTM8026
36V, 5A, CVCC Step-Down µModule Regulator
Demonstration circuit 1696 is a 36V, 5A, CVCC step-down
μModule regulator featuring the LTM8026. The demo
circuit is designed for a 3.3V output from an input volt-
age range of 6V to 36V. The output can source 5A. The
circuit can be operated in either constant voltage mode
or constant current mode.
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
BOARD PHOTO
The LTM8026 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this quick start
guide prior to working on or modifying demo circuit 1696.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA= 25°C)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply Voltage Range 636V
Output Voltage IOUT = 5A 3.135 3.3 3.465 V
Switching Frequency 550 kHz
Maximum Output Current 5A
Efficiency VIN = 12V, IOUT = 5A 86 %

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dc1696f
DEMO MANUAL DC1696
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Demonstration circuit 1696 is an easy way to evaluate
the performance of the LTM8026. 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
and GND or VOUT and GND terminals.
1. With power off, connect the input power supply to VIN
and GND.
VIN
IIN IOUT
VOUT
POWER SUPPLY
2. Connect a load to VOUT and GND.
3. Turn on the power at the input.
4. Check for the proper output voltage and current.
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 and input within the operating ranges and observe
the output voltage regulation, output current regulation,
ripple voltage, efficiency and other parameters.

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DEMO MANUAL DC1696
QUICK START PROCEDURE
Figure 2. DC1696A Output Noise Spectrum. (VIN = 12V, VOUT = 3.3V, IOUT = 5A)
FREQUENCY (MHZ)
0
–120
INTENSITY (dBm)
–20
–40
–60
–80
–100
0
0.5 3 3.5 4 4.5 51 1.5 2
1696 F01
2.5

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DEMO MANUAL DC1696
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 Cap., Ceramic 10μF, 50V, 10%, 1210 Murata GRM32ER71H106K
2 1 CIN2 Cap., Alum 22μF, 50V, 10%, OSCON-CE-6.3 SUNCON 50CE22BSS
3 1 COUT1 Cap., X5R 100μF, 6.3V, 20%, 1210 TDK C3225X5R0J107M
4 1 COUT3 Cap., OSCON 330μF, 4V, 20%, OSCON-C6 SANYO 4SVPC330M
5 1 C1 Cap., NPO 1000pF, 50V, 20%, 0603 AVX 06035A102MAT1A
6 1 C2 Cap., X7R 1500pF, 25V, 10%, 0603 AVX 06033C152KAT1A
7 1 R1 Res., Chip 10k, 0.06W, 5%, 0603 Vishay CRCW060310K0JNEA
8 2 R2, R3 Res., Chip 100k, 0.06W, 5%, 0603 Vishay CRCW0603100KJNEA
9 1 R4 Res., Chip 301k, 0.06W, 1%, 0603 Vishay CRCW0603301KFKEA
10 1 R5 Res., Chip 75.0k, 0.06W, 1%, 0603 Vishay CRCW060375K0FKEA
11 1 R6 Res., Chip 5.62k, 0.06W, 1%, 0603 Vishay CRCW060335K62FKEA
12 1 R7 Res., Chip 510k, 0.06W, 5%, 0603 Vishay CRCW0603510KJNEA
13 1 U1 I.C.,Step-Down Converter.
LGA(81)15mm ×11.25mm ×2.82mm
Linear Tech. Corp. LTM8026EV
Additional Demo Board Circuit Components
1 0 COUT2 (OPT) Cap., 1210
2 0 C3 (OPT) Cap., 1206
3 0 C4 (OPT) Cap., 1210
4 0 C5 (OPT) Cap.
5 0 FB1 (OPT) Ferrite Bead, 1206
6 0 L1 (OPT) Inductor
7 0 R8 (OPT) Res., 0603
Hardware For Demo Board Only
1 5 E1, E2, E3, E8, E9 Turret, Testpoint MILL-MAX 2501-2-00-80-00-00-07-0
2 4 E4, E5, E6, E7 Turret, Testpoint MILL-MAX 2308-2-00-80-00-00-07-0
3 2 JP1, JP2 Headers, Single Row 3 Pins 2mm Ctrs. SAMTEC TMM-103-02-L-S
4 4 J1, J2, J3, J4 Connector, Banana Jack KEYSTONE 575-4
5 2 XJP1, XJP2 Shunt, 2mm Ctrs. SAMTEC 2SN-BK-G

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DEMO MANUAL DC1696
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
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SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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6
dc1696f
DEMO MANUAL DC1696
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0212 • 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.
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Copyright © 2004, Linear Technology Corporation