DC2120A - Demo Manual

DEMO MANUAL DC2120A
LT3048-15
Low Noise Bias Generator
Description
Demonstration circuit 2120A features the LT3048-15, a
Boost DC/DC Converter with integrated Schottky diode and
LDO in a 2mm × 2mm DFN package. This demo board is
designed to convert a 2.7V to 4.8V input to a 15V output
at 19mA to 35mA with low output ripple and noise. The
LT3048-15 is programmed for 2MHz switching frequency.
This demonstration board can be used to evaluate other
fixed output voltage versions of the LT3048.
Performance Summary
PARAMETER
The LT3048 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 for the demo circuit DC2120A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2120A
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.
Specifications are at TA = 25°C
CONDITIONS
MIN
Input Supply Range
Output Voltage Range
VIN = 2.7V, IOUT = 19mA
Switching Frequency
VIN = 4.8V, Load = 37mA
MAX
4.8
14.625
15
15.375
1.7
2.2
2.7
1
UNITS
V
V
MHz
mV
80
4.8VIN
70
2.7VIN
60
EFFICIENCY (%)
Output Ripple
TYP
2.7
50
40
30
20
10
2
6
10 14 18 22 26 30 34 38
OUTPUT CURRENT (mA)
dc2120a F01
Figure 1. DC2120A Efficiency
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DEMO MANUAL DC2120A
Quick Start Procedure
Demonstration circuit 2120A is easy to set up to evaluate the performance of the LT3048. Refer to Figure 2 for
proper measurement equipment setup and follow the
procedure below:
NOTE. When measuring the output voltage ripple, connect
a X1 oscilloscope probe as shown in Figure 3.
1.Place jumper in the following positions: JP1 Run
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 4.8V.
4.Connect a 20mA load from VOUT to GND and check for
the proper output voltage. VOUT = 14.625V to 15.375V
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 voltages are established, adjust
the input voltage and load within the operating range
and observe the output voltage regulation, ripple voltage, efficiency and other parameters.
Figure 2. Proper Measurement Equipment Setup
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DEMO MANUAL DC2120A
Quick Start Procedure
Figure 3. Output Ripple Measurement Technique
Figure 4. Output Voltage Ripple
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DEMO MANUAL DC2120A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
C1
CAP., X7R, 4.7µF, 25V, 10%, 0805
TDK, C2012X7R1E475K
2
1
C2
CAP., X7R, 2.2µF, 25V, 10%, 0805
TDK, C2012X7R1E225K
3
1
C4
CAP., X7R, 1µF, 25V, 10%, 0603
TDK, C1608X7R1E105K
4
1
C3
CAP., C0G, 1nF, 25V, 5%, 0603
MURATA GRM1885C1E102JA01D
5
1
L1
INDUCTOR, 10µH
COOPER Bussmann, SD3110-100-R
6
1
U1
IC., LT3048EDC-15#PBF, DFN-2X2, 8 LEAD
LINEAR TECH., LT3048EDC-15#PBF
7
1
FAB, PRINTED CIRCUIT BOARD
DEMO BOARD 2120A
CAP., X7R, 1µF, 25V, 10%, 0603
TDK, C1608X7R1E105K
Additional Demo Board Circuit Components
1
1
C5
Hardware: For Demo Board Only
1
4
E1-E4
TESTPOINT, TURRET, 0.094"
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
3 PIN 0.079" SINGLE ROW HEADER
SULLINS, NRPN031PAEN-RC
3
1
XJP1
SHUNT, 0.079" CENTER
SAMTEC, 2SN-BK-G
4
1
STENCIL
STENCIL DC2120A
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DEMO MANUAL DC2120A
A
1
24
3.6
37
22
3.3
4.8
19
Vin (V)
2
SW
7
C2
2.2uF
25V
0805 JP1
3
3
5
A
B
GND
C
D
VIN
2.7V - 4.8V
5
E3
E1
1
RUN ON
OFF
2
2
EN
VIN
1
L1
10uH
4
GND
COPPER
BUSSMANN
SD3110-100-R
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
8
4
NOTE: UNLESS OTHERWISE SPECIFIED
4
BYP
5
LDOOUT
LDOIN
BSTOUT
U1
LT3048EDC-15
3
GND
3
9
6
C3
1nF
2
C1
4.7uF
25V
0805
C4
1uF
25V
*
2.7
Iout (mA)
E4
C5
1uF
25V
E2
1
*
GND
VOUT
15V
B
C
D
Schematic Diagram
dc2120af
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 DC2120A
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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Linear Technology Corporation
LT 0314 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
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