Analog Devices Linear DC2681A-A Quick setup guide

dc2681aaf

DEMO MANUAL DC2681A-A

DESCRIPTION

LTM4645

25A DC/DC Step-Down

µModule Regulator

Demonstration circuit DC2681A-A features the

LT M ®4645EY, a 25A high efficiency, switch mode step-

down power µModule®regulator. The input voltage

range is from 6V to 15V. To use DC2681A-A for input

voltage range from 4.7V to 6V, connect INTVCC to SVIN

(change R22 from OPT to 0Ω), DRVCC to VIN (change

R21 from 0Ω to OPT, R28 from OPT to 0Ω). The output

voltage range is 0.6V to 1.8V. Derating is necessary for

certain VIN, VOUT, frequency and thermal conditions. The

DC2681A-A offers the TRK/SS pin allowing the user to

program output tracking or soft-start period. The board

operates in continuous conduction mode in heavy load

conditions. For high efficiency at low load currents, the

MODE_PLLIN jumper selects pulse-skipping mode for

noise sensitive applications or burst mode operation in

L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

Analog Devices, Inc. All other trademarks are the property of their respective owners.

BOARD PHOTO

less noise sensitive applications. The MODE_PLLIN pin

also allows the LTM4645 to synchronize to an external

clock signal (between 400kHz and 800kHz). DC2681A-A

has the option of choosing both internal and external

compensation circuit for LTM4645. Tying the PHASMD

pin to different voltage generates certain phase differ-

ence between MODE_PLLIN and CLKOUT. The LTM4645

data sheet must be read in conjunction with this demo

manual prior to working on or modifying demo circuit

DC2681A-A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2681A-A

dc2681aaf

DEMO MANUAL DC2681A-A

QUICK START PROCEDURE

Demonstration circuit DC2681A-A is an easy way to evalu-

ate the performance of the LTM4645EY. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

1. Place jumpers in the following positions for a typical

application:

MODE RUN

CCM ON

2. With power off, connect the input power supply, load

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

and VIN supply to 12V.

3. Turn on the power supply at the input. The output volt-

age should be 1.0V ± 1.0% (0.99V to 1.01V).

4. Vary the input voltage from 6V to 15V and adjust the

load current from 0A-25A. Observe the output voltage

regulation, ripple voltage, efficiency, and other param-

eters.

5. (Optional) For optional load transient test, apply an

adjustable pulse signal between IOSTEP_CLK and GND

test points. The pulse amplitude sets the load step cur-

rent amplitude. Keep the pulse width short (<1ms) and

pulse duty cycle low (<5%) to limit the thermal stress

on the load transient circuit.

6. (Optional) LTM4645 can be synchronized to an external

clock signal. Place the JP1 jumper on EXT_CLK and

apply a clock signal (0V to 5V, square wave) on the

MODE_PLLIN test point.

PERFORMANCE SUMMARY

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 6V to 15V

Output Voltages 1.0V ± 1.0%

Maximum Continuous Output Current Derating is Necessary for Certain Operating

Conditions. See Data Sheet for Details

25ADC

Operating Frequency 600kHz

Efficiency VIN = 12V, VOUT = 1.0V, IOUT = 25A 84.6% Figure 2

Load Transient VOUT(P-P) VIN = 12V, VOUT = 1.0V, ISTEP = 0A to 12.5A 128mV Figure 3

dc2681aaf

DEMO MANUAL DC2681A-A

QUICK START PROCEDURE

Figure 1. Measurement Setup of DC2681A-A

–

LOADVIN

dc2681aaf F01

dc2681aaf

DEMO MANUAL DC2681A-A

QUICK START PROCEDURE

70.00

72.00

74.00

76.00

78.00

80.00

82.00

84.00

86.00

88.00

90.00

EFFICIENCY (%)

0.00 5.00 10.00 15.00 20.00 25.00

OUTPUT CURRENT (A)

1.8 VOUT

1.5 VOUT

1.2 VOUT

1.0 VOUT

0.8 VOUT

dc2681aaf F02

VOUT: 50mV/DIV

IOUT_STEP: 10A/DIV

dc2681aaf F03

Figure 2. Measured Efficiency at VIN = 12.0V, fSW = 600kHz, CCM

Figure 3. Measured Load Transient

12VIN, 600kHz Efficiency Sweeps

dc2681aaf

DEMO MANUAL DC2681A-A

QUICK START PROCEDURE

Figure 4. Thermal Image of LTM4645

VIN = 12V, VOUT = 1.0V, ILOAD = 25A

Ambient Temperature = 25.0°C, No Forced Air Flow

dc2681aaf

DEMO MANUAL DC2681A-A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., ALUM., 150µF, 35V, 20%, HVH SUN ELECTRONIC INDUSTRIES CORP., 35HVH150MT

2 3 CIN3, CIN4 CAP., 22µF, X5R, 25V, 20%,1210 MURATA, GRM32ER61E226ME15L

3 3 COUT1, COUT2, COUT4 CAP., 100µF, X5R, 6.3V, 20%, 1210 MURATA,GRM32ER60J107ME20L

4 2 COUT7, COUT8 CAP., POSCAP, 330µF, 2V, D2E PANASONIC, 2TPF330M6

5 1 C2 CAP., 4.7µF, X5R, 10V, 10%, 0603 AVX, 0603ZD475KAT2A

6 1 C3 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104KAT2A

7 1 C5 CAP., 120pF, X7R, 50V,10%, 0603 YAGEO, CC0603KRX7R9BB121

8 1 C8 CAP., 1µF, X7R, 50V,10%, 0805 MURATA, GRM21BR71H105KA12L

9 1 C11 CAP., 1µF, X7R, 50V,10%, 0603 TAIYO YUDEN, UMK107AB7105KA-T

10 1 Q1 XSTR., MOSFET, N-CH, 40V, TO-252 VISHAY, SUD50N04-8M8P-4GE3

11 2 R3, R19 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA

12 1 R4 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

13 1 R9 RES., 47.5k, 1/10W, 1%, 0603 VISHAY, CRCW060347K5FKEA

14 2 R14, R16 RES., 10Ω, 1/10W, 5%, 0603 VISHAY, CRCW060310R0JNEA

15 1 R15 RES., 90.9k, 1/10W, 1%, 0603 VISHAY, CRCW060390K9FKEA

16 1 R20 RES., SENSE, 0.01Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA

17 1 R25 RES., 2.2Ω, 1/10W, 5%, 0603 VISHAY, CRCW06032R2JNEA

18 1 R26 RES., 50k, 1/10W, 1%, 0603 VISHAY, CRCW060350K0FKEA

19 1 U1 IC, LTM4645EY#PBF BGA77-15×9-5.01 LINEAR TECH., LTM4645EY#PBF

Additional Demo Board Circuit Components

1 0 CIN2 CAP., OPTION, 1206 MURATA, GRM31CR6YA106KA12L

2 0 CIN5, COUT3, COUT5, COUT6,

COUT9, COUT10

CAP., OPTION, 1210 OPT

3 0 COUT11, COUT12 CAP., OPTION, D3L OPT

4 0 C4, C6, C7, C9 CAP., OPTION, 0603 OPT

5 6 R1, R6, R13, R18, R21, R27 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

6 0 R8, R10, R11, R17, R22, R23,

R24, R28

RES., OPTION, 0603 OPT

Hardware: For Demo Board Only

1 18 E1-E18 TESTPOINT, TURRET, .062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 1 JP1 CONN., HEADER, 2×4, 2mm SULLINS, NRPN042PAEN-RC

3 1 JP2 CONN., HEADER, 1×3, 2mm SULLINS, NRPN031PAEN-RC

4 2 J1,J3 CONN., BANANA JACK KEYSTONE, 575-4

5 2 J2,J4 STUD, TESTPIN PEM, KFH-032-10

6 4 J2,J4 (×2) NUT, BRASS 10-32 ANY, #10-32M/S BR PL

7 2 J2,J4 RING, LUG #10 KEYSTONE, 8205

8 2 J2,J4 WASHER, TIN PLATED BRASS ANY, #10 EXT BZ TN

9 2 J5,J6 CONN, BNC, 5 PINS CONNEX, 112404

10 2 XJP1, XJP2 SHUNT, 2mm SAMTEC, 2SN-BK-G

11 4 MTGS. at 4 CORNERS STAND-OFF, NYLON, SNAP-ON, 0.50" TALL KEYSTONE, 8833 (SNAP ON)

dc2681aaf

DEMO MANUAL DC2681A-A

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

35V

6V - 15V

DYNAMIC LOAD CIRCUIT

DO NOT EXCEED 5% DUTY CYCLE!

1.0V

OFF

2TPF330M6

VOUT

GND

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL CAPACITORS AND RESISTORS ARE 0603.

MODULE REGULATOR

LTM4647EY

LTM4645EY 25

LTM4647EY 30

-A

-B

ASSY AMPIC

AMP

VIN

VOUT

VIN

INTVCC

INTVCCINTVCC

INTVCC VIN

INTVCC

VIN

SVIN

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 02-27-17

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 02-27-17

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 02-27-17

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

Monday, February 27, 2017

SINGLE-OUTPUT, HIGH EFFICIENCY STEP-DOWN

LTM4645EY / LTM4647EY

DEMO CIRCUIT 2681A(A,B)

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

Monday, February 27, 2017

SINGLE-OUTPUT, HIGH EFFICIENCY STEP-DOWN

LTM4645EY / LTM4647EY

DEMO CIRCUIT 2681A(A,B)

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

Monday, February 27, 2017

SINGLE-OUTPUT, HIGH EFFICIENCY STEP-DOWN

LTM4645EY / LTM4647EY

DEMO CIRCUIT 2681A(A,B)

E10

VIN

E15

GND

120pF

COUT3

OPT

1210

INTVCC

JP2

RUN

COUT12

R25

2.2

DRVCC

C11

1uF

R24

OPT

CIN2

OPT

1206

E13

GND_SNS

COUT2

100uF

1210

100k

PGOOD

OPT

E16

SVIN

R27

VIN

HIZB

R28

OPT

COMP

COUT4

100uF

1210

VOUT

E14

IOSTEP_CLK

COUT10

OPT

1210

OPT

R14

MODE/PLLIN

R16

R22

OPT

R18

CLKOUT

10k

SUD50N04-8M8P

E12 VOUT_SNS

R15

90.9k

OPT

E17

TEMP-

GND

TRK/SS

OPT

R13

R26

49.9k

E18

TEMP+

COUT9

OPT

1210

RUN

CIN1

150uF

JP1

EXT_CLK

CCM

MODE

7 8

R20

0.01

2010

47.5K

COUT5

OPT

1210

R11

OPT

COUT6

OPT

1210

CIN4

22uF

1210

COUT7

330uF

COUT1

100uF

1210

CIN5

OPT

1210

R19

10K

R21

R17

OPT

CIN3

22uF

1210

0.1uF

4.7uF

10V

COUT11

OPT

1uF

0805

LTM4645EY

VOUT J1

GND

PWM

TEST1

GND

TEST2 D5

RUN A6

HIZB E5

CLKOUT B5

PHASMD C7

COMPb

COMPa

VOSNS- G5

VOSNS+ G6

INTVCC C6

DRVCC C5

SW F3

VIN

B1 VIN

A3 VIN

A2 VIN

GND

VIN

C2 VIN

GND

VIN

SGND

TEST3

GND

SVIN

TEMP-

E1 GND

E2 GND

TEMP+

GND

VOUT J3

VOUT J2

VOUT J4

VOUT K1

VOUT K2

VOUT K3

VOUT K4

VOUT L1

VOUT L2

VOUT L3

VOUT L4

VOUT L5

VOUT L6

VOUT L7

MODE/PLLIN B7

FREQ D7

PGOOD G7

TRACK/SS F5

R10

OPT

COUT8

IOSTEP

R23

OPT

E11

GND

VOSNS+

RUN

VOSNS-

TEMP-

TEMP+

dc2681aaf

DEMO MANUAL DC2681A-A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0517 • 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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