DEMO MANUAL DC1738A
LTM8028
Noise, 5A µModule Regulator
Description
Demonstration circuit 1738A features the LT M®8028, a
®
µModule
efficiency switching regulator and a 5A UltraFast™ linear
regulator, resulting in a low noise solution suitable for high
speed data applications. The demo circuit is designed for
an input voltage of 6V to 36V and an operating frequency
of 250kHz. The output voltage is digitally programmable
from 0.8V to 1.8V in 50mV increments by adjusting the
three tri-state inputs VO0, VO1, and VO2.
The user may adjust the output voltage over a continuous
±10% range by applying a voltage to MARGA. A PGOOD
signal indicates that the output is within 10% of the target
step-down converter that integrates both a high
BoarD photo
36V
voltage. The SENSEP pin creates a Kelvin sense connection to account for voltage drops due to PCB resistances
between the regulator and the load.
The LTM8028 data sheet gives a complete description of
the part, operation and application information. The data
sheet must be read in conjunction with this demo manual
prior to working on or modifying DC1738A.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
, UltraFast, Low Output
IN
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DEMO MANUAL DC1738A
performance summary
Specifications are at TA = 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range V
= 0.8V to 1.8V 6 36 V
OUT
Output Voltage* Default Setting 1.773 1.8 1.827 V
Maximum Output Current 5 A
Switching Frequency R
= 165kΩ 250 kHz
T
*For other output voltage settings, refer to Table 1
Table 1: VO2 to VO0 Setting vs Nominal Output Voltage
–20
–40
0
VIN = 12V
= 1.5V
V
OUT
= 5A
I
OUT
VO2 VO1 VO0 V
OUT(NOM)
Low Low Low 0.80V
Low Low Float 0.85V
Low Low High 0.90V
–60
–80
INTENSITY (dBm)
–100
–120
Low Float Low 0.95V
Low Float Float 1.00V
Low Float High 1.05V
Low High Low 1.10V
Low High Float 1.15V
–140
1 2
1.5 2.543 5
0.5 4.5
0
FREQUENCY (MHz)
3.5
dc1738a F01
Low High High 1.20V
Float Low Low 1.25V
Float Low Float 1.30V
Figure 1. DC1738A Output Noise Spectrum
Float Low High 1.35V
Float Float Low 1.40V
Float Float Float 1.45V
Float Float High 1.50V
Float High Low 1.55V
Float High Float 1.60V
Float High High 1.65V
High Don't Care Low 1.70V
High Don't Care Float 1.75V
High Don't Care High 1.80V
2
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Quick start proceDure
DEMO MANUAL DC1738A
Demonstration circuit 1738A is an easy way to evaluate
the performance of the LTM8028. Refer to Figure 2 for
proper measurement equipment setup and follow the
procedure below:
1. Place JP1-JP3 according to Table 1 to program the
desired output voltage.
2. With power off, connect the input power supply, load
and meters, as shown in Figure 2. Preset the V
between 6V to 36V.
3. Turn on the power at the input.
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 or is shorted.
supply
IN
5. 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.
6. In order to use the Kelvin sense connection to account
for output voltage drops, place JP4 in the SENSEP
position and connect the SENSEP turret at the input
of the load.
7. In order to minimize EMI noise, an input filter can be
utilized by removing R6 on the bottom of the board
and populating the optional circuit components.
Figure 2. Proper Measurement Equipment Setup
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DEMO MANUAL DC1738A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106K
2 1 C2 CAP., X7R, 0.01µF, 16V, 5%, 0603 AVX, 0603YC103J AT2A
3 1 C4 CAP., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107M AT2A
4 1 C8 CAP., POSCAP, 470µF, 4V, D3L SANYO, 4TPF470ML
5 1 C9 CAP., X5R, 10µF, 10V, 20%, 0805 TAIYO YUDEN, LMK212ABJ106MG-T
6 1 C10 CAP., X5R, 4.7µF, 4V, 20%, 0603 AVX, 06034D475M AT2A
7 1 C12 CAP., X5R, 22µF, 10V, 20%, 0805 TAIYO YUDEN, LMK212BBJ226MG-T
8 1 R1 RES., CHIP, 402kΩ, 1/10W, 1%, 0603 VISHAY, CRCW0603402KFKEA
9 1 R3 RES., CHIP, 165kΩ, 1/16W, 1%, 0603 VISHAY, CRCW0603165KFKEA
10 2 R4, R7 RES., CHIP, 100kΩ, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA
11 1 R6 RES., CHIP, 0Ω, 1/4W, 1%, 1206 NIC, NRC12ZOTRF
12 1 R9 RES., CHIP, 49.9Ω, 1/16W, 1%, 0603 VISHAY, CRCW060349R9FKEA
13 1 U1 IC., MODULE REGULATOR, LTM8028EY, BGA-114 LEAD LINEAR TECHNOLOGY CORPORATION, LTM8028EY
Additional Demo Board Circuit Components
1 0 C3, C6 (OPT) CAP., 1210
2 0 C5 (OPT) CAP., 0603
3 0 C7 (OPT) CAP., ALUM
4 1 C11 CAP., ALUM, 22µF, 50V SUN ELECT., 50CE22BS
5 0 R2, R5, R8 (OPT) RES., CHIP, 0603
6 0 FB1 (OPT) FERRITE BEAD, M TYPE TAIYO YUDEN, FBMJ3216HS800T
7 0 L1 (OPT) IND., 10µH VISHAY, IHLP-2525CZ-01
Hardware: For Demo Board Only
1 8
2
3 1 JP4 JMP, 0.079", SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S
4 4 J1-J4 CONN, BANANA JACK, KEYSTONE-575-4 KEYSTONE, 575-4
5 1 J5 CONN, BNC CONNEX, 112404
6 4 XJP1-XJP4 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
7 4 MTGS AT 4 CORNERS STAND-OFF, SNAP-ON, NYLON, 0.50" TALL
E1-E8 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
3 JP1-JP3 JMP, 0.079", SINGLE ROW HEADER, 4 PIN SAMTEC, TMM-104-02-L-S
4
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schematic Diagram
VOUT
0.8V - 1.8V / 5AJ3VOUT
SENSEP
SENSEP
JP4JP4
E5E5
1
132
0.8V - 1.8V / 5A
VOUT
J3
E8E8
BNC
J5J5
C3
OPT.C3OPT.
1210
C12
22uF
10V
C12
22uF
10V
0805
C9
10uF
10VC910uF
10V
0805
C10
4.7uF4V0603
C10
4.7uF4V0603
DEMO MANUAL DC1738A
GNDJ4GND
J4
E3E3
R9
49.9R949.9
C8
470uF
4V+C8
470uF
4V
+
6.3V
1210 D3L
C4
100uFC4100uF
MARGA
0V - 1.2V
E4E4
R5
OPTR5OPT
1
A11
A10
B10
C10
B11
C11
D10
D11
E10
E11
F10
2
LOW
HIGH
FLOAT
VO2 *VO1 *VO0 *
132
4
LOW
HIGH
FLOAT
132
4
LOW
HIGH
FLOAT
132
3
4
5
4
VOBVOB VOB VOB
* REFER TO DEMO MANUAL
A9
VOUT
VOUT
VOUT
JP3JP3
JP2JP2
JP1JP1
SENSEP
VO2
A5
VO1
B6
VO0
A6
VOB
B5
VIN
VINH2VIN
VINJ2VINK1VINK2VINL1VINL2RUNF1SYNC
J1
H1
C1
10uF
50VC110uF
50V
IN
R1
402KR1402K
**
0
R60R6
1206
C11
22uF
50V+C11
22uF
50V
VIN
+
J1
J1
E6E6
F11
J9
J11
J10
BKV
BKV
VOUT
VOUT
VOUT
VOUT
BKV
VOUT
VOUT
VOUT
VOUT
VOUT
U1
RT
SS
IMAX
PGOOD
E1
E2
D2
D1
B7
1210
R2
OPTR2OPT
J2
E1E1
E7E7
A8
A7
K11
K10
K9
L9
L11
L10
L8
L7
BKV
BKV
BKV
BKV
BKV
BKV
GND
TEST
MARGA
LTM8028EYU1LTM8028EY
GND
GNDA2GNDA3GNDA4GNDB1GNDB2GNDB3GNDB4GNDB8GNDB9GNDC1GNDC2GNDC3GNDC4GNDC5GNDC6GNDC7GNDC8GND
A1
R3
165KR3165K
R8
OPTR8OPT
C2
10nFC210nF
R4
100KR4100K
R7
100KR7100K
VOB
E2E2
K7
GNDK4GNDK5GNDK6GNDK8GNDL4GNDL5GNDL6GND
GND
GND
J8
GND
J7
GND
J6
GND
J5
GND
J4
GND
H11
GND
H10
GND
H9
GND
H8
GND
H7
GND
H6
GND
H5
GND
H4
GND
G11
GND
G10
GND
G9
GND
G8
GND
G7
GND
G6
GND
G5
GND
G4
GND
F9
GND
F8
GND
F7
GND
F6
GND
F5
GND
F4
GND
F3
GND
F2
GND
E9
GND
E8
GND
E7
GND
E6
GND
E5
GND
E4
GND
E3
GND
D9
GND
D8
GND
D7
GND
D6
GND
D5
GND
D4
GND
D3
C9
REMOVE R6 IF OPTIONAL CIRCUIT IS USED.
2
3
Figure 3. DC1738A Demo Circuit Schematic
4
**
C7
22uF
50V+C7
22uF
50V
INVIN
**
OPTIONAL CIRCUIT
+
L1
10uHL110uH
1210
IHLP-2525CZ-01
C6
10uF
50VC610uF
50V
FB1
Bead
FB1
Bead
C5
0.01uF
50VC50.01uF
50V
1. ALL RESISTORS AND CAPACITORS ARE 0603
5
2. INSTALL SHUNTS AS SHOWN.
NOTE: UNLESS OTHERWISE SPECIFIED
VIN
VIN
6V - 36V
6V - 36V
SYNC
GNDJ2GND
PGOOD
D D
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.
C C
B B
A A
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DEMO MANUAL DC1738A
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C) 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 LT C 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 LT C 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.
LT C 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
dc1738af
LT 0413 • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 2013
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