Linear Technology DC2341A Demo Manual

DESCRIPTION

DEMO MANUAL DC2341A

LTC7130EY

20V 20A Monolithic Buck Converter

with Ultra-Low DCR Sensing

Demonstration circuit 2341A is a high efficiency synchronous 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

or forced continuous mode (CCM) operation. The converter 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.

× 7.5mm × 2.22mm 63-pin BGA package.

Design files for this circuit board are available at

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

PERFORMANCE SUMMARY

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 4.5 20 V

Output Voltage V

Maximum Output Current V

Typical Switching Frequency 530 kHz

Typical Efficiency V

Typical Output Voltage Ripple V

(BURST)

Specifications are at TA = 25°C

-

= 4.5V to 20V, I

IN

= 4.5V to 20V, V

IN

= 12V, I

IN

= 12V, I

OUT

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

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.

= 0A to 20A 1.5 ±2% V

OUT

= 1.5V 20 A

OUT

= 20A 89.2 %

= 20A 25 mV

P-P

-

dc2341af

1

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 V

(4.5V to 20V) and GND (input return).

2. Connect the 1.5V output load between V

(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. V

should be 1.5V ±2%.

OUT

and GND

OUT

IN

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.

2

Figure 1. Proper Measurement Equipment Setup

dc2341af

QUICK START PROCEDURE

OUT

EFFICIENCY (%)

100

20

TOTAL I

dc2341a F04

DEMO MANUAL DC2341A

+ –

C

OUT

V

GND

Figure 2. Measuring Output Voltage Ripple

95

90

85

80

75

70

65

60

55

50

0

105 15

LOAD CURRENT (A)

4.5V 12V

IN

20V

IN

dc2341a F03

IN

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

V

O

50mV/DIV

AC-COUPLED

10A LOAD STEP

5A/DIV

: 10A TO/

O

FROM 20A

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

No Forced Airflow)

dc2341af

3

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

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

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

RES, 0603 OPTION

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

dc2341af

4

DEMO MANUAL DC2341A

5

4

3

2

1

SCHEMATIC DIAGRAM

1

2

REV

9-2-15PRODUCTION

1.5V

20A MAX

VOUT

1210 1210

25V

J3

VOUT

744308025

DCR=0.37mOHM

SW

CIN6

10uF

25V

1206

R1 2.2

J2

E2

GND

Charlie

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

2

__

CIN5

22uF

25V

CIN4

22uF

25V

CIN3

OPT

25V

+

VIN

OPT

CIN2

+

CIN1

180uF

E1

J1

VIN

4.5V - 20V

D D

L1 0.25uH

C2

J3 J2 J1 H3 H2 H1 G3 G2 G1

A7

F3 F2 E3 E2 E1 D4 D3 D2

A1

G7 E7 E6 E5 E4 F7 F6 F5 F4

VIN

COUT4

330uF

+

COUT1

330uF

2.5V

+

6.3V

COUT3

100uF

6.3V

100uF

COUT2

0.22uF

25V

SW SW SW SW SW SW SW SW SW

NC2

NC1

VIN VIN VIN VIN VIN VIN VIN VIN VIN

C1

1uF

RUN

2.5V

GND GND GND GND GND GND GND GND

OFFON

7343

12101210

25V

7343

R5

R4

D1

R3

F1

D5

R2

3

1

GND

J4

3.09k

1%

619

1%

INTVCC

CMDSH-3

2.7

BOOST

SVIN

OPT

2

JP1

E3

B6

C1

RUN

R8

C4

R7

SNSA+

D1

INTVCC

R6

OPT

C3

OPT

R9

R12

0

OPT

C5

220nF

INTVCC

R11

10

B2

C6

SNS-

3.01k

R10

4.7uF

R14

U1

C2

1%

100k

6.3V

R15 OPT

OPT

C7

220nF

B1

LTC7130

ILIM

R131k1%

C C

VO_SNS+

E4

A3

DIFFP

SNSD+

1

VO_SNS-

E5

VOUT

R18

OPT

C8

0

R19

10k

R17

A4

A2

DIFFN

DIFFOUT

PGOODC7MODE/PLLIN

CLKOUT

C6

C3

PGOOD

CLKOUT

2

3

MODE/PLLIN

4

P.S.

CCM

BURST

R16 0

E6

MODE/PLLIN

TEMPERATURE COMPENSATION

OPT

C9

OPT

R32

1%

6.65k

1%

A6

VFB

ITH

A5

GND

G6

GND

G5

GND

G4

GND

H7

GND

H6

GND

H5

GND

H4

GND

J7

GND

J6

GND

J5

GND

J4

SGND

B4

SGND

B3

SGND

C5

SGND

C4

EXTVCC

D7

FREQ

B7

TK/SS

B5

ITEMP

D6

R22

OPT

ITEMP

C10

0.1uF

10V

R20 0

JP2

E7

TRK/SS

C13

OPT

R27

OPT

R25

OPT

1 2

RN1

C12

120pF

R24

6.04k

EXTVCC

CLKOUT

E8

CLKOUT

OPT

1%

C14

4.7uF

6.3V

PGOOD

E9

PGOOD

B B

ITEMP

NETWORK FOR DCR SENSING

C11

2.2nF

R23

124k

EXTVCC

E10

EXTVCC

VOUT

5

E11

4

J5

3 2

1

C17

1uF

1

Q1

SUD50N03-10CP-E3

C16

6.3V

100uF

E13

6.3V

C15

100uF

1210 1210

VOUT

LOAD STEP CIRCUIT

VOUT

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

APPROVALS

CONTRACT NO.

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

IOSTEP CLK

E12

R30

10K

R29

OPT

2 3

R28

0.010

IOUT

STEP

COUT6

OPT

7343

+

COUT5

OPT

7343

+

A A

REV

SHEET OF

1

Fax: (408)434-0507

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

LTC Confidential-For Customer Use Only

LTC7130EY

DC2341A

LTC7130EY

DC2341A

LTC7130EY

TECHNOLOGY

HZ

PCB DES.

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

DC2341A

Wednesday, December 02, 2015 1

IC NO.

SCHEMATIC

WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR

HIGH EFFICIENCY STEP-DOWN CONVERTER

N/A

SIZE

DATE:

SIZE

DATE:

SIZE

TITLE:

Charlie

ENG.

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

DATE:

2

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

3

GND

4

2512 2512

5

dc2341af

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

5

DEMO MANUAL DC2341A

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

Linear Technology Corporation

6

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

dc2341af

LT 0316 • PRINTED IN USA