Linear Technology LT3759 Quick setup guide

dc1787af

DEMO MANUAL DC1787A

DESCRIPTION

LT3759

Wide Input Voltage Range

Boost/SEPIC/Inverting Controller

Demonstration circuit 1787A is a wide input voltage

range SEPIC converter featuring the LT3759 controller. It

converts a 2.8V~36V input to a 12V output, with 1A load

current capability for VIN ≥ 4V. The converter operates at

a 300 kHz nominal switching frequency, with 91% peak

efficiency. The DC1787A can be easily modified to gener-

ate other output voltages, and can also be optimized for

efficiency and size with narrower input voltage ranges.

The LT3759 is a boost/SEPIC/Inverting controller with a

wide input voltage range, suitable for applications from

single-cell lithium-ion battery portable electronics to high

voltage automotive and industrial power supplies. It also

exhibits low shutdown quiescent current of 1A, making it

an ideal fit for battery-operated systems. Thanks to a novel 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

FBX pin architecture, the LT3759 can be connected directly

to a divider from either positive output or negative output

voltage to ground. It also packs many popular features

such as soft-start, input undervoltage lockout, adjustable

frequency and synchronization in a small 12-lead exposed

pad MSOP package.

The LT3759 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 demo circuit 1787A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range, VIN 2.8 12 36 V

Minimum Startup Voltage 3.0 V

Switching Frequency IOUT = 0.5A 300 kHz

Output Voltage, VOUT V

IN = 2.8V~36V

IOUT = 0mA~0.5A

11.64 12.0 12.36 V

Maximum Continuous Output Current, IOUT VIN ≥ 2.8V 0.5 A

VIN ≥ 4.0V 1 A

Output Voltage Ripple (Peak-to-Peak) VIN = 12V, IOUT = 1A 90 mV

Typical Efficiency VIN = 12V, IOUT = 1A 91 %

dc1787af

DEMO MANUAL DC1787A

QUICK START PROCEDURE

Demo circuit 1787A is easy to set up to evaluate the

performance of the LT3759. Refer to Figure 1 for proper

measurement equipment setup and follow the procedure.

1. With power off, connect the input power supply to the

VIN (E1) and GND (E2) terminals on the demo circuit.

NOTE: Minimize the voltage drop and transient on the

input wires between the power supply and input terminals

of the demo circuit.

2. Connect load to the VOUT (E6) and GND (E5) terminals

on the demo circuit. Connect voltage and current meters

as shown in Figure 1. Preset the load to 0.5A or less,

and VIN supply to be 0V.

3. Place jumpers in the following positions for a typical

12V application:

EN (JP1) SYNC (JP2)

ON OFF

NOTE: The demo circuit configures the shutdown voltage

at typical 2.5V, which means that the input voltage can be

dropped to as low as 2.5V, once it starts up. The startup

voltage is 3.0V but can be adjusted by changing R1 and

R3 values.

5. Check for the proper output voltages. The output should

be regulated at 12V (±3%).

NOTE: If there is no output, or output is out of spec, tem-

porarily disconnect the load from the demo board. Make

sure the load current is set within spec, and the power

supply current capability is above 4A.

6. Once the proper output voltage is established, adjust the

input and load within the operating range and observe

the output voltage regulation, ripple voltage, efficiency

and other parameters. Typical efficiency curve, regula-

tion, and operation waveforms are shown in Figures 3

and 4, respectively.

NOTE: Whenmeasuringtheinputoroutputvoltageripples,

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. See Figure 2 for

proper scope probe technique.

4. Turn on the power supply at the input. Slowly increase

VIN to 3.0V.

NOTE: Make sure the input voltage is within the range. If

higher operating voltage is required, power components

with higher voltage ratings should be used. The maximum

input voltage of LT3759 is 42V.

NOTE: The output current capability depends on the input

voltage, as can be seen in Figure 3. Proper cooling is

necessary for overload operations.

dc1787af

DEMO MANUAL DC1787A

QUICK START PROCEDURE

dc1787af F01

Figure 1. Proper Measurement Equipment Setup

Figure 2. Proper Scope Probe Placement for

Measuring Input or Output Ripple

Figure 3. Efficiency Curves Figure 4. Short Circuit Waveforms with Frequency Foldback

INPUT OR OUTPUT CAPACITOR

dc1787af F02

LOAD CURRENT (mA)

100 300 500 600 700 800200 400 900 1000

dc1787af F03

EFFICIENCY (%)

VIN = 12V

VIN = 4V

VIN = 2.8V

dc1787af F04

VO: 10V/DIV

VDS: 50V/DIV

ISW: 5A/DIV

dc1787af

DEMO MANUAL DC1787A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN2 CAP., X7R, 10µF, 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

2 1 CIN3 CAP., ELECT., 22µF, 50V, C-CE-BS-6.3X6.0 SUN ELECT., 50CE22BS

3 2 COUT1, COUT2 CAP., X5R, 47µF, 16V, 10%, 1210 MURATA, GRM32ER61C476KE15L

4 1 C1 CAP., X7R, 4.7µF, 50V, 20%, 1210 MURATA, GRM32ER71H475KA88L

5 1 C2 CAP., X7R, 1µF, 50V 10%, 0805 MURATA, GRM21BR71H105KA12L

6 1 C3 CAP., X5R, 4.7µF, 16V, 10%, 0805 MURATA, GRM219R61C475KE15D

7 1 C5 CAP., X7R, 68nF, 50V, 0603 NIC, NMC0603X7R682K50F

8 1 C6 CAP., X7R, 0.1µF, 25V, 10%, 0603 TDK, C1608X7R1E104K

9 1 C7 CAP., C0G, 470pF, 50V, 5%, 0603 MURATA, GCM1885C1H471JA16D

10 1 D3 DIODE, SCHOTTKY, 3A, POWERDI5 DIODES/ZETEX, PDS360-13

11 1 L1 IND, 15µH, L-DUAL-DRQ127 COILTRONICS, DRQ127-150-R

12 1 Q1 MOSFET, N-CHANNEL, LFPAK RENESAS, RJK0652DPB-00-J5

13 1 RCS RES SENSE, 0.005, 1/2W, 1%, 2010 VISHAY, WSL20105L000FEA

14 1 RFBB RES., CHIP, 15.8k, 1/16W, 1%, 0603 VISHAY, CRCW060315K8FKEA

15 1 RFBS RES., CHIP, 102k, 1/16W, 1%, 0603 VISHAY, CRCW0603102KFKEA

16 1 R1 RES., CHIP, 249k, 1/16W, 1%, 0603 VISHAY, CRCW0603249KFKEA

17 1 R2 RES., CHIP, 100k, 1/16W, 5%, 0603 VISHAY, CRCW0603100KJNEA

18 1 R3 RES., CHIP, 255k, 1/16W, 1%, 0603 VISHAY, CRCW0603255KFKEA

19 1 R4 RES., CHIP, 1.43k, 1/16W, 1%, 0603 VISHAY, CRCW06031K43FKEA

20 1 R5 RES., CHIP, 27.4k, 1/16W, 1%, 0603 VISHAY, CRCW060327K4FKEA

21 1 R6 RES., CHIP, 0, 0603 VISHAY, CRCW06030000Z0ED

22 1 U1 I.C. LT3759EMSE, MSE12 LINEAR TECH.,LT3759EMSE

Hardware/Components (For Demo Board Only)

1 7 E1, E2, E3, E4, E5, E6, E7 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 JMP, 3-PIN, 1 ROW .079CC SAMTEC, TMM-103-02-L-S

3 2 SHUNTS AS SHOWN ON

ASSY DWG

SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

4 2 STENCILS BOTH SIDES DC1787A-2

Additional Demo Board Circuit Components

1 0 D1 DIODE, FAST SWITCHING, 1N4148WT, SOD523F OPT

dc1787af

DEMO MANUAL DC1787A

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

B B

A A

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

0.5A VIN > 2.8V

VIN > 4V

EN/UVLO

PGOOD

VIN

+VOUT

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LT3759EMSE

11MP25:21,1102/03/90

SEPIC CONVERTER WITH WIDE INPUT VOLTAGE RANGE

KIM T.

ZHONGMING Y.

N/A

DEMO CIRCUIT 1787A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LT3759EMSE

11MP25:21,1102/03/90

SEPIC CONVERTER WITH WIDE INPUT VOLTAGE RANGE

KIM T.

ZHONGMING Y.

N/A

DEMO CIRCUIT 1787A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

LT3759EMSE

11MP25:21,1102/03/90

SEPIC CONVERTER WITH WIDE INPUT VOLTAGE RANGE

KIM T.

ZHONGMING Y.

N/A

DEMO CIRCUIT 1787A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION109-30-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION109-30-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

ZHONGMING Y.

PRODUCTION109-30-11

E5 GND

EN/UVLO E4

EN/UVLO

RJK0652DPB

PDS360

2 1

CIN1

10uF

50V

1210

CIN1

10uF

50V

1210

GND E2

GND

1.43k

COUT1

47uF

16V

1210

COUT1

47uF

16V

1210

JP1

RUN

SHDN

JP1

RUN

SHDN

COUT2

47uF

16V

1210

COUT2

47uF

16V

1210

4.7uF 16V

0805

4.7uF 16V

0805

27.4k

1uF

50V

0805

1uF

50V

0805

LT3759EMSE

INTVCC

FBX 2

GND

EN/UVLO

SYNC

VIN

11 DRIVE 10

PGOOD 6

SENSE 7

GATE 8

249k

CIN2

10uF

50V

1210

CIN2

10uF

50V

1210

470pF

0.1uF

L1B

15uH

L1B

15uH

2 4

E6 +VOUT

12V /

E6 +VOUT

12V /

JP2

OFF

SYNC

JP2

OFF

SYNC

VIN

2.8V - 36V

VIN

2.8V - 36V L1A

15uH

DRQ127-150-R

L1A

15uH

DRQ127-150-R

1 3

CIN3

22uF

50V

SUN ELECT

50CE22BS

CIN3

22uF

50V

SUN ELECT

50CE22BS

E7 SYNC

RFBB

15.8k

RFBB

15.8k

PGOOD E3

PGOOD

4.7uF

50V

1210

4.7uF

50V

1210

RCS

0.005

2010

RCS

0.005

2010

255k

RFBS

102k

RFBS

102k

68nF

100k

OPT

1N4148WT

OPT

1N4148WT

dc1787af

DEMO MANUAL DC1787A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1111 • 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.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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