Linear Technology DC2341A Quick setup guide

dc2341af

DEMO MANUAL DC2341A

DESCRIPTION

LTC7130EY

20V 20A Monolithic Buck Converter

with Ultra-Low DCR Sensing

Demonstration circuit 2341A is a high efficiency syn-

chronous buck DC/DC converter with 4.5V to 20V input

range. It can supply 20A maximum load current at 1.5V

output. The demo board features the LT C

7130 regulator.

No external MOSFETs are required. It employs an LTC

proprietary current sensing, current mode architecture,

allowing the use of a very low DC resistance (DCR) power

inductor to maximize efficiency in high current applica-

tions. Differential output voltage sensing along with a

precision internal reference combine to offer accurate

output regulation. The LTC7130 is housed in a 6.25mm

× 7.5mm × 2.22mm 63-pin BGA package.

The light load operation mode of the converter is deter-

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

select pulse-skipping mode (P.S.), Burst Mode

(BURST) L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

PERFORMANCE SUMMARY

or forced continuous mode (CCM) operation. Theconverter

can also be externally synchronized through the MODE/

PLLIN pin (MODE/PLLIN terminal on the board; JP2: no

jumper or BURST position). 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 ±10% regula-

tion window.

The LTC7130 data sheet gives a complete description of

the operation and application information. The data sheet

must be read in conjunction with this demo manual.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2341A

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 4.5 20 V

Output Voltage VIN = 4.5V to 20V, IOUT = 0A to 20A 1.5 ±2% V

Maximum Output Current VIN = 4.5V to 20V, VOUT = 1.5V 20 A

Typical Switching Frequency 530 kHz

Typical Efficiency VIN = 12V, IOUT = 20A 89.2 %

Typical Output Voltage Ripple VIN = 12V, IOUT = 20A 25 mVP-P

dc2341af

DEMO MANUAL DC2341A

QUICK START PROCEDURE

Demonstration circuit 2341A is easy to set up to evaluate

the performance of the LTC7130. 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 20V) 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, adjust

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.

Figure 1. Proper Measurement Equipment Setup

dc2341af

DEMO MANUAL DC2341A

Figure 2. Measuring Output Voltage Ripple

Figure 3. Efficiency vs Load Current (VO= 1.5V, Burst Mode)

Figure 4. Load Step Transient Test (VIN = 12V) Figure 5. Thermal Picture (VIN = 12V, IO= 20A. 21°C Ambient,

No Forced Airflow)

QUICK START PROCEDURE

+ –

OUT

GND

COUT

LOAD CURRENT (A)

EFFICIENCY (%)

100

dc2341a F03

105 15

4.5VIN

12VIN

20VIN

50mV/DIV

AC-COUPLED

10A LOAD STEP

5A/DIV

TOTAL I

O: 10A TO/

FROM 20A

dc2341a F04

dc2341af

DEMO MANUAL DC2341A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP, ALUM ELEC180µF 20% 25V PANASONIC., 25SVPF180M

2 2 CIN4, CIN5 CAP, 1210 22µF 20% 25V X5R AVX, 12103D226MAT2A

3 1 CIN6 CAP, 1206 10µF 20% 25V X5R AVX, 12063D106MAT2A

4 2 COUT1, COUT4 CAP, 7343 330µF 20% 2.5V POSCAP PANASONIC, 2R5TPE330M9

5 4 COUT2, COUT3, C15, C16 CAP, 1210 100µF 20% 6.3V X5R AVX, 12106D107MAT2A

6 2 C1, C17 CAP, 0805 1µF 10% 25V X5R AVX, 08053D105KAT2A

7 2 C2, C5, C7 CAP, 0603 220nF 10% 25V X5R MURATA GRM188R71E224KA88D

8 1 C10 CAP, 0603 0.1µF 10% 10V X5R AVX, 0603ZD104KAT2A

9 1 C11 CAP, 2.2nF X7R 50V 5% 0603 AVX, 06035C222JAT2A

10 1 C12 CAP, 0603 120pF 10% 25V NPO AVX, 06033A121KAT2A

11 2 C6, C14 CAP, 0805 4.7µF 20% 10V X5R AVX, 0805ZD475MAT2A

12 1 D1 DOIDE, SCHOTTKY 30V SOD-323 CENTRAL SEMI., CMDSH-3 TR

13 1 L1 IND, 0.25µH WURTH ELEKTRONIK, 744308025

14 1 Q1 MOSFET, N-CH D-S 40V TO252 VISHAY, SUD50N04-8M8P-4GE3

15 1 R1 RES, 2.2Ω 1/10W 5% 0603 VISHAY, CRCW06032R20JNEA

16 4 R8, R16, R17, R20 RES, 0Ω JUMPER 1/10W 0603 VISHAY, CRCW06030000Z0EA

17 2 R19, R30 RES, 10k 1/10W 5% 0603 VISHAY, CRCW060310K0JNEA

18 1 R28 SENSE RES, 2512 0.01Ω 1% 1W VISHAY, WSL2512R0100FEA

19 1 R10 RES 0603 100k 1% 1/10W VISHAY, CRCW0603100KFKEA

20 1 R13 RES 0603 1k 1% 1/10W VISHAY, CRCW06031K00FKEA

21 1 R4 RES, 0603 619Ω 1% 1/10W VISHAY, CRCW0603619RFKEA

22 2 R9, R12 RES, 0603 10Ω 5% 1/10W VISHAY, CRCW060310R0JNEA

23 1 R24 RES, 0603 6.04k 1% 1/10W VISHAY, CRCW06036K04FKEA

24 2 R3 RES, 0603 2.7Ω 1% 1/10W VISHAY, CRCW06032R7FKEA

25 1 R23 RES, 0603 124k 1% 1/10W VISHAY, CRCW0603124KFKEA

26 1 R11 RES, 0603 3.01k 1% 1/10W VISHAY, CRCW06033K01FKEA

27 1 R5 RES, 0603 3.09k 1% 1/10W VISHAY, CRCW06033K09FKEA

28 1 R32 RES, 0603 6.65k 1% 1/10W VISHAY, CRCW06036K65FKEA

29 1 U1 IC, LTC7130EY#PBF LINEAR TECH., LTC7130EY#PBF

Additional Demo Board Circuit Components

30 0 COUT5, COUT6 OPT CAP, 7343 OPTION

31 0 CIN2, CIN3, (OPT) CAP, OPTION

32 0 C3, C4, C8, C9, C13, (OPT) CAP, 0603 OPTION

33 0 RN1, R2, R6, R7, R14, R15, R18, R22,

R25, R27, R29

RES, 0603 OPTION

Hardware: For Demo Board Only

34 13 E1-E13 TESTPOINT, TURRET, 0.094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0

35 1 JP2 HEADER, 4 PIN 0.079" SINGLE ROW SULLINS, NRPN041PAEN-RC

36 1 JP1 HEADER, 3 PIN 0.079" SINGLE ROW SULLINS, NRPN031PAEN-RC

37 4 J1-J4 JACK, BANANA KEYSTONE 575-4

38 1 J5 CONN, BNC, 5 PINS CONNEX, 112404

39 4 MH1, MH2, MH3, MH4 STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833

40 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

dc2341af

DEMO MANUAL DC2341A

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

744308025

DCR=0.37mOHM

12101210

N/A

VOUT

LOAD STEP CIRCUIT

IOUT

IOSTEP CLK

2512 2512

1210 1210

1206

1210 1210

TEMPERATURE COMPENSATION

NETWORK FOR DCR SENSING

STEP

20A MAX

PGOOD

CLKOUT

ITEMP

EXTVCC

CLKOUT

ITEMP

PGOOD

EXTVCC

VOUT

INTVCC

VOUT

INTVCC

VIN

VOUT

VIN

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

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.

Wednesday, December 02, 2015 1 1

HIGH EFFICIENCY STEP-DOWN CONVERTER

Charlie

LTC7130EY

DC2341A

WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

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.

Wednesday, December 02, 2015 1 1

HIGH EFFICIENCY STEP-DOWN CONVERTER

Charlie

LTC7130EY

DC2341A

WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR

SIZE

DATE:

IC NO.

REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

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.

Wednesday, December 02, 2015 1 1

HIGH EFFICIENCY STEP-DOWN CONVERTER

Charlie

LTC7130EY

DC2341A

WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

9-2-15PRODUCTION

2Charlie

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

9-2-15PRODUCTION

2Charlie

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

9-2-15PRODUCTION

2Charlie

E13

OPT

COUT1

330uF

2.5V

7343

GND

OPT

E11

R32

6.65k

MODE/PLLIN

R20 0

1uF

25V

C17

1uF

COUT4

330uF

2.5V

7343

LTC7130

ITH

VFB A6

DIFFOUT A4

DIFFN A2

DIFFP A3

SNSD+ B1

SNS- B2

SNSA+ C1

ILIM

SW J2

SW H3

SW G2

SW J3

INTVCC

SW G1

PGOOD

MODE/PLLIN

FREQ

RUN

TK/SS

VIN G7

SW G3

SW H1

SW H2

SW J1

GND D2

GND D3

GND D4

GND E1

GND E2

GND E3

GND F2

GND F3

GND

VIN E4

VIN E5

VIN E6

VIN E7

VIN F4

VIN F5

VIN F6

VIN F7

SGND

BOOST F1

ITEMP

SVIN

EXTVCC

CLKOUT

NC1 A1

NC2 A7

OPT

COUT2

100uF

6.3V

R10

100k

R27

OPT

PGOOD

220nF

R13

4.7uF

6.3V

R22

OPT

C15

100uF

6.3V

C11

2.2nF

CIN2

OPT

25V

R14

OPT

R19

10k

C16

100uF

6.3V

RUN

COUT6

OPT

7343

OPT

R24

6.04k

GND

JP2

MODE/PLLIN

P.S.

CCM

BURST

TRK/SS

OPT

R18

OPT

CMDSH-3

R25

OPT

2.7

619

R11

3.01k

R28

0.010

R1 2.2

C14

4.7uF

6.3V

CIN6

10uF

25V

1.5V

VOUT

VO_SNS+

SUD50N03-10CP-E3

2 3

E10

EXTVCC

VIN

CIN4

22uF

25V

R30

10K

220nF R15 OPT

0.22uF

25V

C12

120pF

R17 0

R23

124k

VO_SNS-

E12

GND

L1 0.25uH

C10

0.1uF

10V

COUT5

OPT

7343

CLKOUT C13

OPT

3.09k

CIN5

22uF

25V

JP1

RUN

OFFON

R16 0

GND

CIN3

OPT

25V

CIN1

180uF

25V

4.5V - 20V

VIN

R12

OPT

R29

OPT

RN1

OPT

1 2

COUT3

100uF

6.3V

dc2341af

DEMO MANUAL DC2341A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0316 • 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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