Linear Technology DC1738A Quick setup guide

dc1738af

DEMO MANUAL DC1738A

Description

LTM8028

36VIN, UltraFast, Low Output

Noise, 5A µModule Regulator

Demonstration circuit 1738A features the LT M

8028, a

µModule

step-down converter that integrates both a high

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

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.

BoarD photo

voltage. The SENSEP pin creates a Kelvin sense connec-

tion 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

dc1738af

DEMO MANUAL DC1738A

performance summary

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range VOUT = 0.8V to 1.8V 6 36 V

Output Voltage* Default Setting 1.773 1.8 1.827 V

Maximum Output Current 5 A

Switching Frequency RT= 165kΩ 250 kHz

*For other output voltage settings, refer to Table 1

Specifications are at TA= 25°C

FREQUENCY (MHz)

INTENSITY (dBm)

–60

–40

–20

3.5

–80

–100

1 2

0.5 4.5

1.5 2.5 4

3 5

–120

–140

dc1738a F01

VIN = 12V

VOUT = 1.5V

IOUT = 5A

Figure 1. DC1738A Output Noise Spectrum

Table 1: VO2 to VO0 Setting vs Nominal Output Voltage

VO2 VO1 VO0 VOUT(NOM)

Low Low Low 0.80V

Low Low Float 0.85V

Low Low High 0.90V

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

Low High High 1.20V

Float Low Low 1.25V

Float Low Float 1.30V

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

dc1738af

DEMO MANUAL DC1738A

Quick start proceDure

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 VIN supply

between 6V to 36V.

3. Turn on the power at the input.

4. Check for the proper output voltage.

NOTE:Ifthereisnooutput,temporarilydisconnecttheload

to make sure that the load is not set too high or is shorted.

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

dc1738af

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, 0603YC103JAT2A

3 1 C4 CAP., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

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, 06034D475MAT2A

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 E1-E8 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

23 JP1-JP3 JMP, 0.079", SINGLE ROW HEADER, 4 PIN SAMTEC, TMM-104-02-L-S

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

dc1738af

DEMO MANUAL DC1738A

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.

Figure 3. DC1738A Demo Circuit Schematic

schematic Diagram

D D

C C

B B

A A

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603

MARGA

OPTIONAL CIRCUIT

1210

IHLP-2525CZ-01

LOW

HIGH

SYNC

1210

2. INSTALL SHUNTS AS SHOWN.

* REFER TO DEMO MANUAL

6.3V

1210 D3L

1210

0805

FLOAT

1206

0V - 1.2V

VO2 *VO1 *VO0 *

LOW

HIGH

FLOAT

LOW

HIGH

FLOAT

REMOVE R6 IF OPTIONAL CIRCUIT IS USED.

BNC

PGOOD

0805

SENSEP

VOUT

VIN

INVIN

VOBVOB VOB VOB

VOB

49.9

JP1JP1

FB1

Bead

FB1

Bead

100K

E4E4

0.01uF

50V

0.01uF

50V

OPT.

10nF

OPT

22uF

50V

22uF

50V

E1E1

VOUT

0.8V - 1.8V / 5A

VOUT

0.8V - 1.8V / 5A

470uF

E6E6

JP4JP4

100K

10uF

10V

10uF

10V

100uF

JP2JP2

E2E2

E5E5

E8E8

10uF

50V

10uF

50V

VIN

6V - 36V

VIN

6V - 36V

10uF

50V

10uF

50V

402K

402K C12

22uF

10V

C12

22uF

10V

J5J5

J4 GND

OPT

E3E3

C11

22uF

50V

C11

22uF

50V

LTM8028EY

VO1 B6

BKV K11

BKV K10

VIN

BKV K9

VIN

VOUT A11

VOUT A10

VIN

RUN

SYNC

VOUT B10

VOUT C10

BKV L9

BKV J9

VOUT B11

VOUT C11

VOUT D10

IMAX

BKV J11

BKV J10

VOUT D11

VOUT E10

VOUT E11

TEST A8

BKV L11

BKV L10

VOUT F10

VOUT F11

SENSEP A9

GND

VO0 A6

VOB B5

VO2 A5

GND

G10

GND

G11

GND

H10

GND

H11

GND

GND K4

GND K5

GND K6

GND K8

GND L4

GND L5

GND L6

GND L8

MARGA A7

GND K7

GND L7

PGOOD

10uH

E7E7

OPT

JP3JP3

C10

4.7uF

0603

C10

4.7uF

0603

GND J2

GND

165K

dc1738af

DEMO MANUAL DC1738A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0413 • PRINTED IN USA

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. LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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