Linear Technology DC2479A-A User manual

dc2479aaf

DEMO MANUAL DC2479A-A

DESCRIPTION

LTM4650EY

Dual Phase Single 50A

DC/DC μModule Regulator

Demonstration circuit 2479A-A features the LT M

4650EY,

the high efficiency, high density, dual 25A, single 50A

switch mode step-down power module regulator. The

input voltage is from 4.5V to 15V. The output voltage is

programmable from 0.6V to 1.8V. DC2479A-A is con-

figured as dual-phase, single-output, which can deliver

up to 50A maximum. The board designs with minimum

components to demonstrate this high efficiency, high

density µModule. As explained in the data sheet, output

current de-rating is necessary for certain VIN, VOUT, and 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.

BOARD PHOTO

thermal conditions. These features and the availability of

the LTM4650EY in a compact 16mm ×16mm ×5.01mm

BGA package make it ideal for use in many high-density

point-of-load applications. The LTM4650 data sheet must

be read in conjunction with this demo manual for working

on or modifying the demo circuit DC2479A-A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2479A-A

Figure 1. LTM4650/DC2479A-A Demo Board

dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

Demonstration circuit DC2479A-A is easy to set up to

evaluate the performance of the LTM4650EY. Please refer

to Figure 1 for proper measurement setup and follow the

procedure below:

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

and meters as shown in Figure 2. Preset the load to 0A

and VIN supply to 12V.

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

age should be 1.0V ± 1.5% (0.985V~1.015V).

3. Oncetheproperoutputvoltageisestablished,adjustthe

load within the operating range and observe the output

voltage regulation, output voltage ripple, efﬁciency and

other parameters. Output ripple can be measured at J6

with BNC cables.

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

adjustable pulse signal between “IOSTEP CLK” and

“GND” test point. Pulse amplitude (3V~3.5V) sets the

loadstepcurrentamplitude.Theoutputtransientcurrent

can be monitored at the BNC connector J5 (10mV/A).

The pulse signal should have very small duty cycle

(< 10%) to limit the thermal stress on the transient

load circuit.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4.5V ~ 15V

Output Voltage VOUT VIN = 4.5~15V, IOUT = 0~50A 1.0V ± 1.5% (0.985V ~ 1.015V)

Maximum Continuous Output Current De-Rating is Necessary for Certain VIN, VOUT and Thermal Conditions,

See Data Sheet for Detail.

50A

Default Operating Frequency 500kHz

Efficiency VIN = 12V, VOUT = 1.0V, IOUT = 50A, fSW = 500 kHz 86.6%, See Figure 4

Load Transient VIN = 12V, VOUT = 1.0V, ISTEP = 25A to 37.5A < 60mVP-P, See Figure 5

dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

+–

LOAD (0A ~ 50A)

1mΩ

VOUT

VIN

4.5V-15V

+–

–

+–

dc2479aa F02

Figure 2. Test Setup of DC2479A-A

Figure 3. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

70%

75%

80%

85%

90%

1 5 10 15 20 25 30 35 40 45 50

EFFICIENCY

LOAD CURRENT dc2479 F04

Figure 4. Efficiency vs Load Current at VIN = 12V, VO= 1V, fSW = 500kHz

Figure 5. Measured 25A – 37.5A Load Transient Response (VIN = 12V, VOUT = 1.0V, fSW = 500kHz)

VO(20MHz BW) [20mV/DIV, AC COUPLED]

25A-37.5A LOAD STEP

dc2479 F05

dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

Figure 6. Output Voltage Ripple at VIN = 12V, VOUT = 1V, IOUT = 50A, fSW = 500kHz

Figure 7. Thermal Performance at VIN = 12V, VOUT = 1V, IOUT = 50A, TA= 23.8°C, No Air Flow

VOUT (20MHz BW) [10mV/DIV

dc2479 F06

dc2479aaf

DEMO MANUAL DC2479A-A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., 150µF, 25V, Aluminum Electr., SUN ELECT., 25CE150AX

2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L

3 4 COUT2, COUT4, COUT6, COUT8 CAP., 470µF, 2.5V, POSCAP, F8 SANYO-D4D PANASONIC, 2R5TPF470M6L

4 1 C4 CAP., X5R, 2.2µF, 10V, 10%, 0603 MURATA, GRM188R61A225KE34D

5 1 C7 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A

6 3 C8, C9, C10 CAP., X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A

7 1 Q1 XSTR, SUD50N04-8M8P-4GE3 MOSFET VISHAY, SUD50N04-8M8P-4GE3

8 2 R1, R3 RES., 10, 1%,1/10W, 0603 VISHAY, CRCW060310R0FKEA

9 2 R2, R9 RES., 121k, 1%,1/10W, 0603 VISHAY,CRCW0603121KFKEA

10 2 R4, R18 RES., 10k, 1%,1/10W, 0603 VISHAY, CRCW060310K0FKEA

11 1 R11 RES., 1k, 1%,1/10W, 0603 VISHAY, CRCW06031K00FKEA

12 1 R16 RES., 0.01Ω, 1W, 2512 VISHAY, WSL2512R0100FEA

13 1 R19 RES., 90.9k, 1%,1/10W, 0603 VISHAY, CRCW060390K9FKEA

14 1 U1 LTM4650EY#PBF, 16×16×5.01 BGA LINEAR TECH., LTM4650EY#PBF

Additional Demo Board Circuit Components

1 8 COUT1, COUT3, COUT5, COUT7,

COUT11, COUT12, COUT13,

COUT14

CAP., X5R, 100µF, 6.3V, 20%,1210 AVX, 12106D107MAT2A

2 0 COUT9, COUT10 CAP., OPT, SANYO-D4D OPT

3 0 C1, C3, C5, C11 CAP., OPT, 0603 OPT

4 0 R8, R10 RES., OPT, 0603 OPT

5 2 R12, R14 RES., 0Ω,1/10W, 0603 VISHAY, CRCW06030000Z0EA

6 0 R13 RES., OPT, 0603 OPT

7 0 R20 RES., OPT, 2512 OPT

Hardware: For Demo Board Only

1 9 E1-E7, E17, E18 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 0 E8-E14 TESTPAD SMD TESTPAD SMD

3 1 JP1 HEADER, 3 PIN 2mm SINGLE ROW WURTH ELEKTRONIK, 620-003-111-21

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

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

6 4 J2, J4 (×2) NUT, BRASS 10-32 ANY #10-32

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

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

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

10 1 XJP1 SHUNT 2mm WURTH ELEKTRONIK, 608-002-134-21

dc2479aaf

DEMO MANUAL DC2479A-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

50A

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

DYNAMIC LOAD CIRCUIT

VOUT

LTM4650EY-1

LTM4650EY

ASSY

-A

-B

4.5V - 15V

RUN

OFF

OPT

220pF

OPT

4.7nF

OPT

2.55K

R13

470uF

OPT

COUT2,4,6,8 COUT1,3,5,7

100uF

330uF

COUT11,13

100uF

OPT

COUT12,14

100uF

330uF

PGOOD

RUN

TRACK

VFB

PGOOD

COMP

RUN

TRACK

DIFFP

DIFFN

VFB

COMP

VIN

INTVCC

VOUT

VO+

VO-

VO+

INTVCC

VO+ VO-

VOUT

VIN

VOUT

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION

2 ST 05-12-16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION

2 ST 05-12-16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION

2 ST 05-12-16

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

DEMO CIRCUIT DC2479A(A/B)

Thursday, May 12, 2016

HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT

N/A

LTM4650EY / LTM4650EY-1

STEP-DOWN POWER MODULE REGULATOR

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

DEMO CIRCUIT DC2479A(A/B)

Thursday, May 12, 2016

HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT

N/A

LTM4650EY / LTM4650EY-1

STEP-DOWN POWER MODULE REGULATOR

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

DEMO CIRCUIT DC2479A(A/B)

Thursday, May 12, 2016

HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT

N/A

LTM4650EY / LTM4650EY-1

STEP-DOWN POWER MODULE REGULATOR

COUT4

2.5V

COUT2

2.5V

R20

OPT

2512

COUT11

1210

1uF

CIN5

22uF

25V

1210

R19

90.9K

R13

E13 SW1

121K

R14

0 Ohm

0603

R11

E18

GND

VO+

E12

PHASMD

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUTS1

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUTS2

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

COUT1

6.3V

1210

JP1

CIN1

150uF

25V

C10

1uF

CIN3

22uF

25V

1210

COUT6

2.5V

E11

EXTVCC

CLKIN

VIN-

RUN

E14

SW2

GND

R10

OPT

R16

0.01

2512

OPT

COUT12

1210

CIN2

22uF

25V

1210

0.6 - 1.8V

VOUT

10K

COUT3

6.3V

1210

1uF

COUT9

OPT

SGND

COUT13

1210

COUT8

2.5V

E10

CLKOUT

CIN4

22uF

25V

1210

TEMP

GND

SUD50N04-8M8P

C11

OPT

COUT14

1210

0.1uF

121K

VO-

VIN

E17

IOSTEP CLK

PGOOD

R18

10K

2.2uF

10V

COUT5

6.3V

1210

VIN+

J5 IOSTEP

R12

0 Ohm

COUT10

OPT

COUT7

6.3V

1210

OPT

dc2479aaf

DEMO MANUAL DC2479A-A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0616 • 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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