Linear Technology DC1980A Quick setup guide

dc1980af

DEMO MANUAL DC1980A

Description

LT3514

Triple Step-Down Switching Regulator

with 100% Duty Cycle Operation

Demonstration circuit 1980A is a triple current mode PWM

step-down DC/DC converter featuring the LT

3514. The

demo circuit is designed for 5V, 3.3V and 1.8V outputs

from a 5.4V to 36V input. The current capability of 5V

and 1.8V outputs is 1A and the 3.3V output is capable of

2A output. Individual soft-start and current limit for each

output as well as frequency synchronous function simplify

the complex design of triple-output power converters.

Each converter is synchronized to either a common ex-

ternal clock input or a resistor programmable 250kHz to

2.2MHzinternaloscillator.Programmablefrequencyallows

optimization between efficiency and external component

size. Each output can be independently disabled using its

own RUN/SS pin.

The LT3514 data sheet gives complete description of the

device, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for the demo circuit 1980A.

Design files for this circuit board are available at

http://www.linear.com/demo

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.

performance summary

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 5.4 36 V

VOUT1 Output Voltage 1 4.85 5 5.15 V

VOUT3 Output Voltage 3 3.2 3.3 3.4 V

VOUT4 Output Voltage 4 1.746 1.8 1.854 V

Frequency Switching Frequency VIN = 12V 0.9 1 1.1 MHz

IOUT1 VOUT1 Maximum Output Current VIN = 5.4V ~ 36V 1 A

Specifications are at TA= 25°C

Figure 2. Thermal Image at VIN = 12V, f = 1MHz with

IOUT1 = IOUT4 = 1A and IOUT3 = 2A

Figure 1. System Efficiency at f = 1MHz with IOUT1 = IOUT4 = 1A

and IOUT3 = 2A

VIN (V)

5 15 2510 20 35

30 40

EFFICIENCY (%)

100

DC1980a F01

DC1980a F02

dc1980af

DEMO MANUAL DC1980A

Quick start proceDure

Demonstration circuit 1980A is easy to set up to evalu-

ate the performance of the LT3514. Refer to Figure 3 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 or VOUT and GND terminals. See Figure 4 for

proper scope probe technique.

1. Place JP1 to JP4 on ON position.

2. With power off, connect the input power supply to VIN

and GND.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

IOUT3 VOUT3 Maximum Output Current VIN = 5.4V ~ 36V 2 A

IOUT4 VOUT4 Maximum Output Current VIN = 5.4V ~ 36V 1 A

VOUT1(AC) VOUT1 Output Ripple VIN = 5.4V ~ 36V, IOUT1 = 1A 25 mV

VOUT3(AC) VOUT3 Output Ripple VIN = 5.4V ~ 36V, IOUT3 = 2A 25 mV

VOUT4(AC) VOUT4 Output Ripple VIN = 5.4V ~ 36V, IOUT4 = 1A 25 mV

performance summary

Specifications are at TA= 25°C

3. Turn on the power at the input.

NOTE. Make sure that the input voltage does not exceed

36V

4. Check for the proper output voltages.

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 voltages are established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

dc1980af

DEMO MANUAL DC1980A

Quick start proceDure

Figure 3. DC1980A Proper Equipment Setup

Figure 4. Measuring Input or Output Ripple

DC1980a F03

GNDVIN OR VOUT DC1980A F04

dc1980af

DEMO MANUAL DC1980A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, X5R, 22µF, 6.3V, 10% 0805 TDK, C2012X5R0J226K

2 1 C3 CAP, X5R, 47µF, 6.3V, 10% 1206 MURATA, GRM31CR60J476KE19L

3 1 C4 CAP, X5R, 22µF, 10V, 10% 0805 TDK, C2012X5R1A226K

4 1 C5 CAP, X5R, 2.2µF, 6.3V, 10% 0603 TDK, C1608X5R0J225K

5 4 C6, C19, C26, C27 CAP, X5R, 1µF, 50V, 10% 0603 TDK, C1608X5R1H105K

6 3 C7, C17, C18 CAP, X7R, 47nF, 10V, 10% 0603 AVX, 0603ZC473KAT2A

7 1 C21 CAP, NP0, 330pF, 50V, 5% 0603 AVX 06035A331JAT2A

8 1 C23 CAP, NP0, 100pF, 50V, 5% 0603 AVX 06035A101JAT

9 2 D1, D4 DIODE, SCHOTTKY BARRIER RECTIFIER ON SEMI, MBRM140T3G

10 1 D3 SCHOTTKY RECTIFIER, SMA VISHAY, B240A-M3

11 1 L1 IND, 8.2µH SUMIDA, CDRH5D28NP-8R2NC

12 1 L3 IND, 4.7µH NIC, NPIM73P4R7MTRF

13 1 L4 IND, 4.2µH SUMIDA, CDRH5D28NP-4R2NC

14 1 L5 IND, 10µH COILCRAFT, XPL2010-103MLB

15 1 R1 RES, CHIP, 12.7k, 1% 1/16W, 0603 VISHAY, CRCW060312K7FKED

16 1 R3 RES, CHIP, 31.6k, 1% 1/16W, 0603 VISHAY, CRCW060331K6FKED

17 1 R4 RES, CHIP, 53.6k, 1%, 1/16W, 0603 VISHAY, CRCW060353K6FKED

18 1 R5 RES, CHIP, 18.2k, 1% 1/16W, 0603 VISHAY, CRCW060318K2FKED

19 1 R6 RES, CHIP, 200k, 5% 1/16W, 0603 VISHAY, CRCW0603200KJNED

20 1 R7 RES, CHIP, 475k, 1% 1/16W, 0603 VISHAY, CRCW0603475KFKED

21 1 R8 RES, CHIP, 100k, 1% 1/16W, 0603 VISHAY, CRCW0603100KFKED

22 3 R9, R11, R12 RES, CHIP, 10k, 1% 1/16W, 0603 VISHAY, CRCW060310K0FKED

23 1 U1 IC, 36V TRIPLE BUCK REGULATOR LINEAR TECHNOLOGY, LT3514EUFD#PBF

Additional Demo Board Circuit Components

1 1 C8 CAP, ALUM, 22µF, 50V, 20% SUN ELECT, 50CE22BS

2 0 C10 (OPT) CAP, X7R, 0.01µF, 50V,10% 0603 TDK, C1608X7R1H103K OPTION

3 0 C11 (OPT) CAP, X7R, 2.2µF, 50V, 10% 1206 MURATA, GCM31CR71H225KA55L

4 3 C12 TO C14 CAP, X7R, 0.1µF, 50V, 10% 0603 MURATA, GRM188R71H104KA93D

5 0 C20, C25, C28 (OPT) CAP, X7R, 0.1µF, 50V, 10% 0603 MURATA, GRM188R71H104KA93D

6 0 C24 (OPT) CAP, 0603

7 0 FB1 (OPT) FERRITE BEAD, OPTION OPTION

8 0 L6 (OPT) IND, 8.2µH OPTION VISHAY, IHLP-2525CZ-01 OPTION

Hardware: For Demo Board Only

1 15 E1 TO E15 TURRET MILL MAX, 2501-2-00-80-00-00-07-0

2 4 JP1 TO JP4 HEADER, 3PIN, 2mm SAMTEC, TMM-103-02-L-S

3 4 xJP1 TO xJP4 SHUNT, 2mm SAMTEC, 2SN-BK-G

dc1980af

DEMO MANUAL DC1980A

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

D D

A A

VIN

VOUT3

3.3V / 2A

GND

RUN/SS1

SYNC

OPTIONAL CIRCUIT

5.4V - 36V

RUN/SS3

RUN/SS4

GND

(1MHz)

GND

VOUT4

1.8V / 1A

GND

5V / 1A

VOUT1

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

VIN

RUN/SS1

RUN/SS3

RUN/SS4

SYNC

VOUT4

VIN

VOUT4

VOUT3

475K 1%

47nF

10V

47nF

10V

C12

0.1uF

50V

C12

0.1uF

50V

10uH

200K

E9E9

E14E14

C13

0.1uF

50V

C13

0.1uF

50V

LT3514EUFD

VIN

DA1 6

FB1 20

VIN

SW1 5

FB3 21

SW4 7

DA4 8

FB4 19

RT/SYNC

SKY

SW5

EN/UVLO

RUN/SS1

RUN/SS3

RUN/SS4

GND

VIN

GND

SW3 4

DA3 3

VIN

GND

R11

10k 1%

R11

10k 1%

E4E4

C14

0.1uF

50V

C14

0.1uF

50V

JP4

OFFON

RUN/SS3

JP4

OFFON

RUN/SS3

E2E2

C20

OPT

50V

C20

OPT

50V

E3E3

53.6k

JP2

OFFON

RUN/SS1

JP2

OFFON

RUN/SS1

100k

VEMIVEMI

18.2k

C28

OPT

50V

C28

OPT

50V

E13E13

47uF

6.3V

1206

47uF

6.3V

1206

22uF

6.3V

0805

22uF

6.3V

0805

C26

1uF

50V

C26

1uF

50V

22uF

10V

0805

22uF

10V

0805

31.6k

12.7k

C21

330pF

C21

330pF

FB1

FERRITE BEAD

FB1

FERRITE BEAD

B240A

JP3

OFF

RUN/SS4

JP3

OFF

RUN/SS4

2.2uF

6.3V

2.2uF

6.3V

C10

0.01uF

50V

C10

0.01uF

50V

10k 1%

R12

10k 1%

R12

10k 1%

E8E8

C17

47nF

10V

C17

47nF

10V

C19

1uF

50V

C19

1uF

50V

8.2uH

MBRM140T3G

4.2uH

CDRH5D28-4R2

4.2uH

CDRH5D28-4R2

1uF

50V

1uF

50V

E15E15

C24

OPT

C24

OPT

E7E7

4.7uH

NPIM73P4R7MTRF

4.7uH

NPIM73P4R7MTRF

C27

1uF

50V

C27

1uF

50V

JP1

OFF

EN/UVLO

JP1

OFF

EN/UVLO

8.2uH

CDRH5D28-8R2

8.2uH

CDRH5D28-8R2

E1E1

22uF

50V

22uF

50V

C11

2.2uF

50V

1206

C11

2.2uF

50V

1206

C23

100pF

C23

100pF

E11E11

C25

OPT

50V

C25

OPT

50V

MBRM140T3G

E12E12

C18

47nF

10V

C18

47nF

10V

E10E10

dc1980af

DEMO MANUAL DC1980A

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 0713 • 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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1980A

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