Linear Technology DC1881A Quick setup guide

dc1881af

DEMO MANUAL DC1881A

DESCRIPTION

LTC3789EUFD

High Efficiency Compact

Buck-Boost Converter

Demonstration circuit 1881A is a high efficiency syn-

chronous buck-boost DC/DC converter with 6V to 36V

input range. It can supply 2.5A maximum load current at

12V output. The demo board features the LTC

3789EUFD

controller. The constant-frequency current mode architec-

ture allows a phase-lockable frequency of up to 600kHz,

while an optional output current feedback loop provides

support for applications such as battery charging. With a

wide input range, wide output range and seamless trans-

fers between operation modes, the LTC3789 is ideal for

automotive, telecom, distributed DC power systems and

battery-powered applications. This board has a compact

solution size with dual SO-8 MOSFETs, small inductor and

capacitor footprints. The package of LTC3789EUFD is a

small, low thermal impedance 4mm ×5mm 28-Lead QFN.

L, LT, LTC, LTM, μModule, 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

The lightload operationmode ofthe converteris determined

with the MODE/PLLIN pin. Use the JP2 jumper to select

pulse skipping mode or forced continuous mode (CCM)

operation. Switching frequency is preset at about 400kHz.

The converter can also be externally synchronized through

the MODE/PLLIN pin (PLLIN terminal on the board). To

shut down the converter, one simple way is to force the

RUN pin below 1.2V (JP1: OFF). The power good output

(PGOODterminal) islow whenthe outputvoltage isoutside

of the ±10% regulation window.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Input Voltage Range 6V to 36V

Output Voltage, VOUT VIN = 6V to 36V, IOUT = 0A to 2.5A 12V ±2%

Maximum Output Current, IOUT VIN = 6V to 36V, VOUT = 12V 2.5A

Typical Output Ripple VIN = 36V, IOUT = 12A (20MHz BW) 44mVP-P

Typical Efficiency VIN = 12V, VOUT = 12V, IOUT = 2.5A 97.2%

Typical Switching Frequency 400kHz

dc1881af

DEMO MANUAL DC1881A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit 1881A is easy to set up to evaluate

the performance of the LTC3789. Refer to Figure 1 for

the proper measurement equipment setup and follow the

procedure below:

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

(6V to 36V) and GND (input return).

2. Connect the 12V output load between VOUT and GND

(Initial load: no load).

3. Connect the DVMs to the input and outputs.

4. Turn on the input power supply and check for the proper

output voltages. VOUT should be 12V ±2%.

5. Once the proper output voltages are established, ad-

just the loads within the operating range and observe

the output voltage regulation, ripple voltage and other

parameters.

Note: When measuring the output or input voltage ripple,

do not use the long ground lead on the oscilloscope probe.

See Figure 2 for the proper scope probe technique. Short,

stiff leads need to be soldered to the (+) and (–) terminals

of an output capacitor. The probe’s ground ring needs to

touch the (–) lead and the probe tip needs to touch the

(+) lead.

Additional Notes:

1. Usually, the worst case efficiency at full load is at 6VIN.

The board can deliver more output power at higher VIN.

2. R2 is needed for additional/constant output current

limit only.

dc1881af

DEMO MANUAL DC1881A

QUICK START PROCEDURE

Figure 2. Measuring Output Voltage Ripple

Figure 3. Efficiency vs Load Current (VO= 12V, CCM)

+–

VOUT GND

COUT

LOAD CURRENT (A)

EFFICIENCY (%)

100

DC1881 F03

2.51.0 2.00.5 1.5

VIN = 36V

VIN = 24V

VIN = 12V

VIN = 6V

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CC1 CAP., C0G, 100pF, 50V, 10% 0603 AVX, 06035A101KAT2A

2 1 CC2 CAP., X7R, 0.01μF, 50V, 10% 0603 AVX, 06035C103KAT2A

3 1 CSS CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

4 1 C15 CAP., X7R, 1μF, 50V, 10% 0805 AVX, 08055C105K

5 2 C7, C8 CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104K

6 1 CF CAP., X7R, 22pF, 50V, 10% 0603 AVX, 06035C220K

7 1 C11 CAP., NPO, 68pF, 50V, 10% 0603 AVX, 06035A680KAT2A

8 1 C10 CAP., X5R, 2.2μF, 16V, 10% 0603 TDK, C1608X5R1C225K

9 1 C24 CAP., X5R, 1μF, 16V, 10% 0603 AVX, 0603YD105KAT2A

10 4 C16, C17, C19, C20 CAP., X7R, 22μF, 16V, 20% 1210 AVX, 1210YC226MAT2A

11 2 C4, C22 CAP., X7R, 0.22μF, 16V, 20% 0603 AVX, 0603YC224MAT2A

dc1881af

DEMO MANUAL DC1881A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

12 3 C9, C25, C26 CAP., X7R, 10μF, 50V, 20% 1210 TDK, C3225X7S1H106M

13 1 C18 CAP., X5R, 10μF, 6.3V, 20% 1206 AVX, 12066D106MAT2A

14 4 D4-D7 SCHOTTKY REC., DFLS160, POWER DI-123 DIODE INC., DFLS160

15 1 D8 ZENER DIODE, 5.1V, BZX84C5V1, SOT23 DIODES INC., BZX84C5V1-7-F

16 1 L1 INDUCTOR, 5.6μH COILCRAFT, XAL7070-562ME

17 2 Q1, Q2 DUAL N-CHANNEL MOSFET, SO-8 VISHAY, Si4288DY-T1-E3

18 1 RC RES., CHIP, 13k, 1/10W, 1% 0603 VISHAY, CRCW060313K0FKEA

19 1 RFB1 RES., CHIP, 113k, 1/10W, 1% 0603 YAGEO, RC0603FR-07113KL

20 1 RFB2 RES., CHIP, 8.06k, 1/10W, 1% 0603 YAGEO, RC0603FR-078K06L

21 1 R18 SENSOR RES., 0.015Ω, 1W, 1%, 2512 THIN FILM TECH., RL3720WT-R015-F

22 1 R2 SENSOR RES., 0.015Ω, .25W, 1%, 1206 VISHAY, WSL1206R0150FEA

23 6 R3, R4, R9, R10, R13, R14 RES., CHIP, 100Ω, 1/10W, 1% 0603 YAGEO, RC0603FR-07100RL

24 1 R7 RES., CHIP, 100k, 1/10W, 1% 0603 YAGEO, RC0603FR-07100KL

25 1 R8 RES., CHIP, 10Ω, 1/10W, 5% 0603 YAGEO, RC0603JR-0710RL

26 1 R26 RES., CHIP, 10Ω 1/8W, 5% 0805 YAGEO, RC0805JR-0710RL

27 1 R5 RES., CHIP, 10Ω 1/8W, 5% 0805 YAGEO, RC0805JR-0710RL

28 6 R1, R11, R17, R23, R25, R27 RES., CHIP, 0Ω, 1/10W, 1% 0603 YAGEO, RC0603FR-070RL

29 1 R20 0Ω JUMPER, 1/4W, 1206 IRC

30 1 R16 RES., CHIP, 1k, 1/10W, 1% 0603 YAGEO, RC0603FR-071KL

31 1 R24 RES., CHIP, 10k, 1/10W, 1% 0603 YAGEO, RC0603FR-0710KL

32 1 R21 RES., CHIP, 121k, 1/10W, 1% 0603 YAGEO, RC0603FR-07121KL

33 1 R30 RES., CHIP, 41.2k, 1/10W, 1% 0603 YAGEO, RC0603FR-0741K2L

34 1 R31 RES., CHIP, 12.1k, 1/10W, 1% 0603 YAGEO, RC0603FR-0712K1L

35 1 U1 I.C., VOLT. REG. LINEAR TECH. CORP. LTC3789EUFD

Additional Demo Board Circuit Components

1 0 CF1 (OPT) CAP., 0603

2 0 COUT1 (OPT) CAP., OS-CON, 330μF, 16V, 20% SANYO, 16SEP330M+T

3 0 C14, C23, C29 C35 (OPT) CAP., 1210

4 0 C12, C13 (OPT) CAP., 1206

5 0 R6, R12, R22 (OPT) RES., 0603

6 0 R28, R29 (OPT) RES., CHIP, 1206

Hardware: For Demo Board Only

1 2 JP1, JP2 3-PIN 0.079" SINGLE ROW HEADER SAMTEC, TMM103-02-L-S

2 2 XJP1, XJP2B SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

3 9 TP3-TP7, TP10-TP14 TESTPOINT, TURRET, 0.094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

4 4 (STAND-OFF) STAND-OFF, NYLON 0.50" KEYSTONE, 8833 (SNAP ON)

dc1881af

DEMO MANUAL DC1881A

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

C C

B B

A A

16V

6.3V

MODE

CCM

PULSE SKIP

XAL7070

0805

50V

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

VOS+

VOUT

VIN+

VOUT

INTVCC

VIN+

VOUT1

INTVCC

VIN+

INTVCC

VOUT

SIZE

DATE:

IC NO. REV.

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

Tuesday, May 15, 2012

HIGH EFFICIENCY COMPACT BUCK-BOOST CONVERTER

CHARLIE Z.

N/A

LTC3789EUFD

DEMO CIRCUIT 1881A

SIZE

DATE:

IC NO. REV.

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

Tuesday, May 15, 2012

HIGH EFFICIENCY COMPACT BUCK-BOOST CONVERTER

CHARLIE Z.

N/A

LTC3789EUFD

DEMO CIRCUIT 1881A

SIZE

DATE:

IC NO. REV.

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

Tuesday, May 15, 2012

HIGH EFFICIENCY COMPACT BUCK-BOOST CONVERTER

CHARLIE Z.

N/A

LTC3789EUFD

DEMO CIRCUIT 1881A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION

2 4-23-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION

2 4-23-12

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION

2 4-23-12

R11 0R11 0

R17 0R17 0

0.22uF

16V

0.22uF

16V

C26

10uF

50V

1210

C26

10uF

50V

1210

C10

2.2uF

C10

2.2uF

R27 0R27 0

R29

(OPT)

R29

(OPT)

C22

0.22uF

16V

C22

0.22uF

16V

Q2A

Si4288DY

Q2A

Si4288DY

3 5

TP12

EXTVCC TP12

EXTVCC

C29C29C17

22uF

16V

C17

22uF

16V

CF1 OPTCF1 OPT

CC2

0.01uF

CC2

0.01uF

Q1B

Si4288DY

Q1B

Si4288DY

1 7

100K

R9 100

R25

R14

100

R14

100

R10 100

C23

(OPT)

1210

C23

(OPT)

1210

C13

(OPT)

C13

(OPT)

JP1

OFF

RUN

JP1

OFF

RUN 1

13K

R6 OPT

R28

(OPT)

1206

R28

(OPT)

1206

R1 0R1 0

C18 10uFC18 10uF

LTC3789EUFD

VFB

SENSE1+

SENSE1-

ITH

SGND

MODE/PLLIN

FREQ

RUN

VINSNS

VOUTSNS

ILIM

IOSENSE+

IOSENSE-

TRIM

SW2

TG2

BOOST2

BG2

EXTVCC

INTVCC

VIN

PGND

BOOST1

SW1

PGOOD

TG1

BG1

SGND

TP6

VIN

6V - 36VTP6

VIN

6V - 36V

CSS

0.1uF

CSS

0.1uF

R16 1KR16 1K

DFLS160

JP2JP2

C7 0.1uFC7 0.1uF

COUT1

OPT

16V

COUT1

OPT

16V

C35

(OPT)

1210

C35

(OPT)

1210

C11

68pF

C11

68pF

DFLS160

BZX84C5V1

RFB2 8.06KRFB2 8.06K

TP3 VIN+

R2 0.015

0.25W

R2 0.015

0.25W C19

22uF

16V

1210

C19

22uF

16V

1210

R18

0.015

R18

0.015

R24

10K

R24

10K

R12 OPTR12 OPT

C16

22uF

16V

1210

C16

22uF

16V

1210

TP5

SS TP5

L1 5.6uHL1 5.6uH

R23 0R23 0

TP7 GND

Q2B

Si4288DY

Q2B

Si4288DY

1 7

R21

121K

R21

121K

R26

R30

41.2K

R30

41.2K

TP13

VOUT

12V / 2.5A MAXTP13

VOUT

12V / 2.5A MAX

C12

(OPT)

1206

C12

(OPT)

1206

C14

(OPT)

1210

C14

(OPT)

1210

R3 100R3 100

10uF

C8 0.1uFC8 0.1uF

CC1 100pF

R22

OPT

R22

OPT

C15

1uF

50V

0805

C15

1uF

50V

0805

TP4

PGOOD TP4

PGOOD

Q1A

Si4288DY

Q1A

Si4288DY

3 5

C25

50V

1210

C25

50V

1210

22pF

R20 0R20 0

R13

100

R13

100

C20C20

RFB1

113K

RFB1

113K

C24

1uF

C24

1uF

TP14 GND

R4 100R4 100

R31

12.1K

R31

12.1K

TP10

PLLIN TP10

PLLIN

DFLS160

dc1881af

DEMO MANUAL DC1881A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0612 • 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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