Linear Technology DC1700A Quick setup guide

dc1700af

DEMO MANUAL DC1700A

DESCRIPTION

LTC3613EWKH

Fast, High Efficiency

Step-Down Regulator

Demonstration circuit 1700A is a fast, high efficiency

synchronous buck DC/DC converter with 4.5V to 24V

input range. It can supply 15A maximum load current at

1.5V output. The demo board features the LTC

3613EWKH

regulator. No external MOSFETs are required. The con-

trolled on-time constant frequency valley current mode

architecture allows for both fast transient response and

constant frequency switching in steady-state operation.

Differential output voltage sensing along with a precision

internal reference combine to offer an accurate output

regulation. The LTC3613 is ideal for applications such

as distributed power systems, servers and point-of-load

converters. The LTC3613EWKH is in a 7mm ×9mm 54-pin

QFN package.

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

The light load operation mode of the converter is de-

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

select discontinuous mode (DCM) or forced continuous

mode (CCM) operation. Switching frequency is pre-set

at about 350kHz. This frequency can be modified from

200kHz to 1MHz by changing the value of a resistor (R18).

The converter can also be externally synchronized from

200kHz to 1MHz 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 1.1V (JP1: OFF).

The power good output (PGOOD terminal) is low when the

output voltage is outside of the ±7.5% regulation window.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range 4.5V to 24V

Output Voltage, VOUT VIN = 4.5V to 24V, IOUT = 0A to 15A 1.5V ±2%

Maximum Output Current, IOUT VIN = 4.5V to 24V, VOUT = 1.5V 15A

Typical Output Ripple VIN = 12V, IOUT = 15A (20MHz BW) 40mVP–P

Typical Efficiency VIN = 12V, VOUT = 1.5V, IOUT = 15A 87.5%

Typical Switching Frequency 350kHz

dc1700af

DEMO MANUAL DC1700A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

Demonstration circuit 1700A is easy to set up to evaluate

the performance of the LTC3613. 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

(4.5V to 24V) and GND (input return).

2. Connect the 1.5V 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 1.5V ±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.

+–

VOUT GND

COUT

dc1700af

DEMO MANUAL DC1700A

QUICK START PROCEDURE

Figure 3. Efficiency vs Load Current (VIN = 12V, VO= 1.5V, CCM)

LOAD CURRENT (A)

EFFICIENCY (%)

51015

dc1700af

DEMO MANUAL DC1700A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN2 CAP, 1210 10μF 10% 16V X5R AVX, 1210YD106KAT

2 1 CIN4 CAP, 82μF, 25V, Sanyo SANYO, 25SVPD82M

3 2 COUT1, COUT2 CAP, 1206 100μF 20% 6.3V X5R MURATA, GRM31CR60J107ME39L

4 2 COUT3, COUT4 CAP, 7343 330μF 20% 2.5V POSCAP SANYO 2R5TPE330M9

5 2 C1, C8 CAP, 0603 0.1μF 10% 25V X7R TDK C1608X7R1E104K

6 1 C2 CAP, 0603 1000pF 10% 50V X7R AVX, 06035C102KAT

7 2 C3, C5 CAP, 0805 4.7μF 10% 16V X5R TDK C2012X5R1C475K

8 1 C6 CAP, 0603 47pF 10% 25V NPO AVX, 06033A470KAT2A

9 1 C7 CAP, 0603 0.01μF 10% 50V X7R AVX, 06035C103KAT

10 1 C9 CAP, 0603 270pF 10% 25V NPO AVX, 06033A271KAT2A

11 1 C10 CAP, 0603 1μF 10% 25V X5R AVX, 06033D105KAT

12 1 D1 DIODE,CMDSH-3 SOD323 CENTRAL CMDSH-3

13 1 L1 IND., 0.47μH, FP1109 series COILTRONICS, FP1109-R47-R

14 1 Q5 XSTR, MOSFET, DPAK-TO252AA VISHAY SUD50N03-12P-E3

15 1 RS1 RES, 2010 0.0015Ω 1% 1/2W VISHAY WSL20101L500FEA

16 1 R1 RES, 0603 100k 1% 1/10W VISHAY CRCW0603100KFKEA

17 3 R2, R12, R17 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

18 2 R4, R5 RES, 0603 10Ω 1% 1/10W VISHAY CRCW060310R0FKEA

19 2 R6, R8 RES, 0603 100Ω 1% 1/10W PANASONIC, ERJ-3EKF1000V

20 1 R10 RES, 0603 90.9k 1% 1/10W PANASONIC, ERJ-3EKF9092V

21 1 R11 RES, 0603 60.4k 1% 1/10W VISHAY, CRCW060360K4FKEA

22 1 R13 RES, 0603 2.2Ω 1% 1/10W NIC, NRC06F2R20TRF

23 1 R15 RES, 0603 21k 1% 1/10W VISHAY, CRCW060321K0FKEA

24 1 R18 RES, 0603 115k 1% 1/10W VISHAY, CRCW0603115KFKEA

25 2 R20, R23 RES, 0603 10k 1% 1/10W NIC, NRC06F1002TRF

25 1 R22 RES, 2010 0.01Ω 1% 1/2W VISHAY WSL2010R0100FEA

27 1 U1 LTC3613EWKH QFN-56-7X9

Additional Demo Board Circuit Components

28 1 CIN3 OPT, 1210

29 2 COUT5, COUT6 OPT

30 3 C4, R9, R16 OPT

31 1 R3 OPT

32 4 R7, R14, R19, R21 OPT

Demo Board Only

33 12 E1, E2, E3, E4, E5, E6, E7, E8, TURRET MILL-MAX 2501-2-00-80-00-00-07-0

34 E9, E10, E11, E12

35 2 JP1, JP2 HEADER, 3PIN, 2mm SAMTEC TMM-103-02-L-S

36 2 XJP1, XJP2 SHUNT, 2mm SAMTEC 2SN-BK-G

37 2 J1, J2 JACK, BANANA KEYSTONE 575-4

38 2 J3, J4 CONN, BNC, 5 PINS CONNEX 112404

dc1700af

DEMO MANUAL DC1700A

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

1. WHEN DCR SENSING IS IMPLEMENTED, SHORT RS1

AND R9; DO NOT POPULATE R6 AND R8.

NOTES: UNLESS OTHERWISE SPECIFIED

1.5V / 15A

LOAD STEP

LOAD STEP CIRCUIT

5% DUTY CYCLE MAX

RUN FSW = 350kHz

CIRCUIT

OFF

OPT

VOUT

CCM MODE

DCM

2. ALL RESISTORS ARE IN 0603

ALL CAPACITORS ARE IN 0603

4.5V - 24V

S+

EXTVCC

VOUT

EXTVCC

VOUT

S+

S-

INTVCC

VIN

INTVCC

VIN

INTVCC

VIN

INTVCC

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION3 08-23-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION3 08-23-11

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

CHARLIE Z.PRODUCTION3 08-23-11

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, August 23, 2011

FAST, HIGH EFFICIENCY STEP-DOWN REGULATOR

CHARLIE Z.

N/A

LTC3613EWKH

DEMO CIRCUIT 1700A

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, August 23, 2011

FAST, HIGH EFFICIENCY STEP-DOWN REGULATOR

CHARLIE Z.

N/A

LTC3613EWKH

DEMO CIRCUIT 1700A

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, August 23, 2011

FAST, HIGH EFFICIENCY STEP-DOWN REGULATOR

CHARLIE Z.

N/A

LTC3613EWKH

DEMO CIRCUIT 1700A

R9R9

C6 47pFC6 47pF

EXTVCC E9

EXTVCC

C10

1uF

C10

1uF

R3R3

CIN2

10uF

25V

1210

CIN2

10uF

25V

1210

R12

J4J4

R23

10k

R23

10k

CIN3

1210

OPT

CIN3

1210

OPT

0.1uF

16V

0.1uF

16V

COUT2

100uF

6.3V

1206

COUT2

100uF

6.3V

1206

CMDSH-3

1 2

J3J3

100K

E3 VIN+

U1B

LTC3613EWKH

U1B

LTC3613EWKH

PVIN

SGND

29 PGND 36

PGND 37

PGND 38

PGND 39

PGND 40

PGND 41

PGND 42

PGND 43

PGND 44

SW 45

SW 46

SW 47

SW 48

SW 49

SW 50

SW 51

NC 52

PVIN

53 PVIN

54 PVIN

55 PVIN

SGND

SW 59

PVIN

OPT

R8 100

PULSE

GEN

PULSE

GEN

R14

OPT

R14

OPT R15 21KR15 21K

E2 VO_SNS-

270pF

E8 GND

E1 VO_SNS+

COUT3

330uF

7343

2.5V

COUT3

330uF

7343

2.5V

COUT5

1206

OPT

COUT5

1206

OPT

CIN1

10uF

25V

1210

CIN1

10uF

25V

1210

E12

TRACK E12

TRACK

E4 VIN

R21

OPT

R21

OPT

RS1

2010

0.0015

RS1

2010

0.0015

R17R17

0.01uF

E5 GND

SUD50N03-12P

E11

PGOOD E11

PGOOD

R13

2.2

R13

2.2

R22

0.01

2010

R22

0.01

2010

JP1JP1

R10

90.9K

R10

90.9K

COUT6

1206

OPT

COUT6

1206

OPT

JP2JP2

U1A

LTC3613EWKH

U1A

LTC3613EWKH

PGOOD

SNS+

SNS-

VOUT

VOSNS-

VOSNS+

TRACK/SS

ITH

VRNG

25 RUN 26

EXTVCC 30

MODE/PLLIN 31

INTVCC 33

PGND 36

NC 27

SW 10

PVIN 1

BOOST 11

SVIN 32

SGND

INTVCC 34

SW 35

0.47uH

FP1109-R47

0.47uH

FP1109-R47

CIN4

82uF

25V

SANYO

25SVPD82M

CIN4

82uF

25V

SANYO

25SVPD82M

R11

60.4K

R11

60.4K

E10

PLLIN E10

PLLIN

0.1uF

50V

0.1uF

50V

R6 100R6 100

VOUT

COUT4

330uF

7343

2.5V

COUT4

330uF

7343

2.5V

COUT1

100uF

6.3V

1206

COUT1

100uF

6.3V

1206

4.7uF

16V

0805

4.7uF

16V

0805

1000pF

E6 VIN-

J2 GND

OPT

R16

OPT

R16

OPT

4.7uF

16V

0805

4.7uF

16V

0805

R18

115K

R18

115K

R19

OPT

R19

OPT

R20

10K

R20

10K

dc1700af

DEMO MANUAL DC1700A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1011 • 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

Mouser Electronics

Authorized Distributor

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

Analog Devices Inc.:

DC1700A

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