Linear Technology DC1523A Guide de configuration rapide

dc1523af

DEMO MANUAL DC1523A

DESCRIPTION

LTC3789EGN:

High Efficiency Synchronous

4-Switch Step-Up/Step-Down

DC/DC Converter

Demonstration circuit 1523A features the LTC

3789EGN,

a high efficiency switching step-up/down controller. The

DC1523A input range is from 5V to 36V. The output volt-

age is 12V. The board is capable of delivering up to 5A of

output current over the input voltage range.

The LTC3789EGN is a high performance switching regula-

tor controller designed to regulate the output using input

voltages above, below or equal to the output voltage.

Synchronous operation provides very high efficiency, up

to 97%. Constant frequency current mode architecture

allows phase-lockable frequency from 200kHz to 600kHz.

An accurate output current limit provides support for

battery charging. A wide input and output range with 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

smooth transfer function through all operating modes

makes the product ideal for automotive, telecom and

battery systems.

The MODE/PLLIN pin can select between pulse skipping

mode and forced continuous mode operation and allows

the IC to be synchronized to an external clock. A Power

Good output pin indicates when the output is within 7.5%

of its set point.

Design files for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITIONS/NOTES VALUE

Minimum Input Voltage 5V

Maximum Input Voltage 36V

Output Voltage VOUT Regulation VIN = 5V to 36V, IOUT = 0A to 5A 12V ±2%

Maximum Continuous Output Current Some Airﬂow May be Needed at Low Input

Voltage and Continuous Full Load

5A DC

Default Operating Frequency R3 = 121k 400kHz

External Clock Synchronous Frequency Range 200kHz to 600kHz

Efﬁciency VIN = 5V to 36V, IOUT = 5A 88% to 97%. See Figures 3 and 6

Load Transient See Figure 5

dc1523af

DEMO MANUAL DC1523A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit 1523A is easy to set up to evalu-

ate the performance of the LTC3789EGN. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below.

1. With power off, connect the input supply, load and

meters as shown in Figure 1. Preset the load to 0A and

VIN supply to 0V.

2. Set the current limit of the input supply high enough

so that the bench supply does not go into current limit

mode. Figure 2 shows input current as a function of

input voltage, at full load. Input current can reach 13A

at 5V input voltage.

3. Place jumpers in the following positions:

JP1 JP2

RUN MODE

ON CCM

4. Turn on the power at the input. Increase VIN to between

5V and 36V. The circuit will start and the output voltage

will regulate at 12V ±2%. The current draw at no load

is 20mA to 60mA depending on the input voltage.

5. Apply load and observe output voltage regulation, ripple

voltage, efficiency and other parameters. Efficiency and

power loss at full load is shown in Figure 3. Continuous

operation with full power and low input voltage may

require some airflow.

POWER

SUPPLY LOAD

DC1523A F01

–

dc1523af

DEMO MANUAL DC1523A

QUICK START PROCEDURE

VIN (V)

20 30

DC1523A F02

10 15 25 35 40

CURRENT (A)

IOUT

IIN

VIN (V)

EFFICIENCY (%)

POWER LOSS (W)

DC1523A F03

84 10 20 30

515 25 35

100

EFFICIENCY

POWER LOSS

Figure 2. Input Current at Full Load (12V at 5A Out)

Figure 4. Output Ripple Voltage at 24VIN (Top), 12VIN (Middle),

6VIN (Bottom). Measured Across COUT1, BW = 20MHz, 100mV/Div

Figure 3. Efficiency and Power Loss at Full Load. The Power

Loss is Highest in Boost Mode Due to the High Inductor Current,

and Drops as Input Voltage Increases. Switching Losses Again

Increase when VIN > VOUT. All Four MOSFETs are Switching in

Buck-Boost Mode and This Shows Up as a Small Increase in

Losses When VIN = 11V to 15.5V

LOAD (A)

EFFICIENCY (%)

DC1523 F06

88 1235

12V

18V

24V

30V

36V

LOAD (A)

035

DC1523A F07

12 46

VOUT (V)

Figure 5. Load Transient Response

Figure 6. Efficiency at Various Input Voltages

Figure 7. Output Current Limit. (VIN = 12V. The Easiest Way to Do

This Test is with an Active Load in Voltage Mode)

dc1523af

DEMO MANUAL DC1523A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CC1 CAP., C0G, 1000pF, 50V, 10% 0603 AVX, 06035A102KAT2A

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

3 1 CIN1 CAP., Alum, 270μF, 50V, 20% SANYO, 50ME270WX+T

4 1 COUT1 CAP., OS-CON, 330μF, 16V, 20% SANYO, 16SEP330M+T

5 4 C1, C2, C16, C17 CAP., X7R, 22μF, 16V, 20% 1210 AVX, 1210YC226MAT2A

6 2 C4, C22 CAP., X7R, 0.22μF, 16V, 20% 0603 TAIYO YUDEN, EMK107BJ224MA

7 4 C5, C6, C9, C25 CAP., X7R, 3.3μF, 50V, 20% 1210 AVX, 12105C335MAT2A

8 1 C10 CAP., X7R, 2.2μF, 10V, 10% 0603 MURATA, GRM188R71A225K

9 1 C12 CAP., NPO, 390pF, 100V, 10% 1206 AVX, 12061A391KAT2A

10 1 C13 CAP., NPO, 1800pF, 100V, 10% 1206 AVX, 12061A182KAT2A

11 1 C14 CAP., X7R, 0.1μF, 50V, 10% 0603 AVX, 06035C104KAT2A

12 1 C15 CAP., X7R, 1μF, 50V, 20% 1206-1210 AVX, 12065C105MAT2A

13 1 C18 CAP., X7R, 10μF, 10V, 20% 1206 AVX, 1206ZC106MAT2A

14 1 C24 CAP., X7R, 1μF, 16V, 20% 0603 AVX, 0603YC105MAT2A

15 1 D2 DIODE, BAS16, SOT23 DIODES, BAS16

16 2 D7, D4 SCHOTTKY REC., DFLS160, PowerDI-123 DIODES INC., DFLS160

17 2 D5, D6 SCHOTTKY RECT., B240A SMA DIODES INC. B240A-13-F

18 1 D8 ZENER DIODE, 5.1V, BZX84C5V1, SOT23 DIODES INC. BZX84C5V1-7-F

19 1 L1 INDUCTOR, 4.7μH TOKO, FDA1254-4R7M

20 1 Q2 MOSFET N-CHAN., 40V VISHAY, Si7884BDP-T1-E3

21 1 Q4 MOSFET N-CHAN., 40V VISHAY, Si4840BDY-T1-E3

22 2 Q3, Q5 MOSFET N-CHAN., SiR496DP, 20V VISHAY, SiR496DP-T1-GE3

23 1 RC RES., CHIP., 14.7k, 0.1W, 1% 0603 VISHAY, CRCW060314K7FKEA

24 1 RFB1 RES., CHIP., 113k, 0.1W, 1% 0603 VISHAY, CRCW0603113KFKEA

25 1 RFB2 RES., CHIP., 8.06k, 0.1W, 1% 0603 VISHAY, CRCW06038K06FKEA

26 1 R1 RES., CHIP., 5.6Ω, 0.1W, 1% 0603 VISHAY, CRCW06035R60FKEA

27 2 R2, R18 Sensor Res., 0.01Ω, 1W, 2%, RL3720W Thin Film Tech., RL3720WT-R010-G-C

28 4 R3, R4, R13, R14 RES., CHIP., 100Ω, 0.1W, 5%, 0603 VISHAY, CRCW0603100RJNEA

29 1 R5 RES., CHIP., 15Ω, 0.125W, 1% 0603 VISHAY, CRCW060315R0FKEA

30 1 R7 RES., CHIP., 100k, 0.1W, 1% 0603 VISHAY, CRCW0603100KFKEA

31 3 R8, R11, R26 RES., CHIP., 10Ω, 0.1W, 5% 0603 VISHAY, CRCW060310R0JNEA

32 2 R10, R9 RES., CHIP., 1.24k, 0.1W, 1% 0603 VISHAY, CRCW06031K24FKEA

33 1 R20 Sensor Res., 0.004Ω, 1W, 2%, RL3720W Thin Film Tech., RL3720WT-R004-G-C

34 1 R21 RES., CHIP., 121k, 0.1W, 1% 0603 VISHAY, CRCW0603121K0FKEA

35 1 R24 RES., CHIP., 10k, 0.1W, 1% 0603 VISHAY, CRCW060310K0FKEA

36 1 R25 RES., CHIP., 0Ω, 0.125W, 0805 VISHAY, CRCW08050000Z0EA

37 1 R28 RES., CHIP., 5.6Ω, 1% 1206 VISHAY, CRCW12065R60FNEA

38 1 R29 RES., CHIP., 3.6Ω, 1% 1206 VISHAY, CRCW12063R60FNEA

39 1 R30 RES., CHIP., 33.2k, 0.1W, 1% 0603 VISHAY, CRCW060333K2FKEA

40 1 R31 RES., CHIP., 12.1k, 0.1W, 1% 0603 VISHAY, CRCW060312K1FKEA

41 1 U1 I.C.,VOLT. REG. Linear Tech. Corp.LTC3789EGN

dc1523af

DEMO MANUAL DC1523A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Demo Board Circuit Components

42 0 C3, C23, C26, C27 OPT CAP., 1210

43 1 CIN2 CAP., Alum, OPT

44 0 CF1, C11, CF, C7, C8 OPT CAP., 0603

45 0 COUT2 OPT

46 0 Q6 OPT Dual N-CHAN., Si7948DP, 60V

47 0 Q7 OPT Dual N-CHAN., Si7958DP, 40V

48 0 R6, R12, R22, R27 OPT RES., OPT

Hardware for Demo Board Only

49 4 TP1, TP2, TP3, TP7 TESTPOINT, TURRET, 0.061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0

50 7 TP4-TP6, TP8, TP10-TP12 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

51 1 JP1 3-PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM103-02-L-S

52 2 JP2C, JP2B 2-PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM102-02-L-S

53 2 XJP1, XJP2B SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

54 4 J1, J2, J3, J4 CONNECTOR, BANANA JACK KEYSTONE, 575-4

55 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON)

dc1523af

DEMO MANUAL DC1523A

SCHEMATIC DIAGRAMS

D D

C C

B B

A A

CIRCUITRY ON

THIS SIDE MUST

CONNECT TO

POWER GND

GROUNDPLANE

CIRCUITRY ON

THIS SIDE MUST

CONNECT TO

SIGNAL GND

GROUNDPLANE

<------ ------>

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

MODE

VOS+

VOUT

VIN

VOUT

INTVCC

VOUT

INTVCC

VIN+

VOUT1

INTVCC

VIN

BG2

TG2

SW2

TG1

SW1

BG1

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

Friday, November 19, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

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

Friday, November 19, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

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

Friday, November 19, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

TAGE B.PRODUCTION3 07-02-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

TAGE B.PRODUCTION3 07-02-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

TAGE B.PRODUCTION3 07-02-10

R11 10R11 10

TP7

GND

TP7

GND

0.22uF

16V

0.22uF

16V

C10

2.2uF

C10

2.2uF

3.3uF

50V

1210

3.3uF

50V

1210

R29

3.6

1206

R29

3.6

1206

R26

C22

0.22uF

16V

C22

0.22uF

16V

SiR496DP

TP12

EXTVCC TP12

EXTVCC

CF1

OPT

CF1

OPT

C26

OPT

1210

C26

OPT

1210

CC2

0.01uF

CC2

0.01uF

15 Ohm

0805

15 Ohm

0805

100K

R9 1.24K

R25

R14

100

R14

100

R10 1.24K

C13

1800pF

1206

C13

1800pF

1206

JP1

OFF

RUN

JP1

OFF

RUN

14.7K

R6 OPT

22uF

16V

1210

22uF

16V

1210

R28

5.6 Ohm

1206

R28

5.6 Ohm

1206

R1 5.6

C23

OPT

1210

C23

OPT

1210

C18

10uF

1206

C18

10uF

1206

J3 VIN

5V - 36V

J3 VIN

5V - 36V

CSS

0.01uF

CSS

0.01uF

R27

OPT

R27

OPT

C16

22uF

1210

16V C16

22uF

1210

16V

JP2B

PULSE

SKIP

JP2B

PULSE

SKIP

OPT

1210

OPT

1210

DFLS160

B240A

C7 OPTC7 OPT

COUT1

330uF

16V

COUT1

330uF

16V

C11

OPT

C11

OPT

CIN1

270uF

50V

CIN1

270uF

50V

B240A

3.3uF

50V

1210

3.3uF

50V

1210

BZX84C5V1

RFB2

8.06K

RFB2

8.06K

TP8

INTVCC TP8

INTVCC

0.010

TP3 VIN+

R18

0.010

R18

0.010

CIN2

OPT

CIN2

OPT

R12 OPT

TP6

VLOGIC TP6

VLOGIC

J4 GND

SiR496DP

Si4840BDY

TP5

SS TP5

4.7uH

R21

121K 1%

R21

121K 1%

R30

33.2K

R30

33.2K

VOUT

12V @ 5A MAX

VOUT

12V @ 5A MAX

C12

390pF

1206

C12

390pF

1206

TP11

SGND TP11

SGND

R3 100R3 100

TP2

VOS+

TP2

VOS+

JP2C

CCM

JP2C

CCM

C8 OPTC8 OPT

CC1 1000pF

C25

3.3uF

50V

1210

C25

3.3uF

50V

1210

R22

OPT

R22

OPT

C15

1uF

50V

1210

C15

1uF

50V

1210

TP4

PGOOD TP4

PGOOD

3.3uF

50V

1210

3.3uF

50V

1210

C17

22uF

1210

16V C17

22uF

1210

16V

C27

OPT

1210

C27

OPT

1210

OPT

R20

0.004

R20

0.004

R13

100

R13

100

LTC3789EGN

VFB

SENSE1+

SENSE1-

ITH

SGND

MODE/PLLIN

FREQ

RUN

VINSNS

VOUTSNS

ILIM

IOSENSE+

IOSENSE-

SW2

TG2

BOOST2

BG2

EXTVCC

INTVCC

VIN

PGND1

BOOST1

SW1

PGOOD

TG1

BG1

22uF

16V

1210

22uF

16V

1210

R24

10K

R24

10K

BAS16

3 1

COUT2

330uF

16V

OPT

COUT2

330uF

16V

OPT

RFB1

113K

RFB1

113K

C24 1uF

J2 GND

R4 100

TP1

VOS-

TP1

VOS-

R31

12.1K

R31

12.1K

TP10

PLLIN TP10

PLLIN

DFLS160

Si7884BDP

C14

0.1uF

C14

0.1uF

dc1523af

DEMO MANUAL DC1523A

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 DIAGRAMS

D D

C C

B B

A A

OPTIONAL CIRCUIT #1

(1.5A OUTPUT)

BG2

TG2TG1

SW2SW1

BG1

VIN VOUT1

TG1

SW1

BG1

TG2

SW2

BG2

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

Thursday, June 17, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

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

Thursday, June 17, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

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

Thursday, June 17, 2010

HIGH EFFICIENCY STEP-UP/DOWN DC/DC CONVERTER

TAGE B.

N/A

LTC3789EGN

DEMO CIRCUIT 1523A

Q6A

Si7948DP

Q6A

Si7948DP

Q6B

Si7948DP

Q6B

Si7948DP

Q7B

Si7958DP

Q7B

Si7958DP

Q7A

Si7958DP

Q7A

Si7958DP

dc1523af

DEMO MANUAL DC1523A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1210 • 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

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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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC1523A

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