Linear Technology LTM4620A Quick setup guide

dc2268abfa

DEMO MANUAL DC2268A-B

Description

LTM4620A

Dual 13A or Single 26A

μModule Regulator

Demonstration circuit 2268A-B is a high efficiency, high

density, dual 13A, switch mode step-down power supply

on a compact 1.5'×1.2' PCB. It features the LTM4620A

μModule regulator. The input voltage is from 5.5V to

16V. The output voltage is programmable from 0.6V to

5V. DC2268A-B can deliver up to 13A maximum in each

channel. As explained in the data sheet, output current

derating is necessary for certain VIN, VOUT, and thermal

conditions. The board operates in continuous conduction

mode in heavy load conditions. For high efficiency at low

load currents, the resistor jumper (R1/R2) selects pulse-

skipping mode for noise sensitive applications or Burst

Mode

inless noise sensitive applications. Tw o outputs can

be connected in parallel for a single 26A output solution

with optional jumper resistors. The board allows the user

to program how its output ramps up and down through

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.

the TRACK/SS pin. Remote output voltage sensing is

available for improved output voltage regulation at the load

point. An optional input inductor L1 reduces the EMI noise

for noise sensitive applications. DC2268A can be easily

inserted to an edge connector for testing and debugging.

These features and the availability of the LTM4620A in a

compact 16mm × 16mm × 5.01mm BGA package make

it ideal for use in many high-density point-of-load regula-

tion applications. The LTM4620A data sheet must be read

in conjunction with this demo manual for working on or

modifying the demo circuit DC2268A-B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2268A-B

BoarD photo

Figure 1. LTM4620A/DC2268A-B Demo Board

dc2268abfa

DEMO MANUAL DC2268A-B

Quick start proceDure

Demonstration circuit DC2268A-B is easy to set up to

evaluate the performance of the LTM4620A. It can be

easily inserted to an edge connector (SAMTEC MEC2-

20-01-L-DV--TR) for testing and debugging. Please refer

to Figure 2 for proper measurement setup and follow the

procedure below:

1. Pull up the RUN1 (J1 pin 22) and RUN2 (J1 pin 24)

between 1.4V to 5V or leave them ﬂoating.

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 in channel 1 should be 3.3V± 1.5% (3.2505V~

3.3495V) and the output voltage in channel 2 should

be 5V ± 1.5% (4.925V ~ 5.075V),

4. Oncetheproper output voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, output voltage ripple, efﬁciency and

other parameters. Output ripple should be measured

at Co3 and Co4.

5. (Optional) LTM4620A can be synchronized to an exter-

nal clock signal. Remove R2 and apply a clock signal

(0~5V, square wave) to MODE-PLLIN pin.

6. (Optional) LTM4620A can be conﬁgured for a 2-phase

single output at up to 36A on DC2268A-B. Install 0Ω

resistors on R26, R27, R28, R29, R32, and remove

R14, R18, R30. Output voltage is set by R7 based on

equation VOUT = 0.6V(1 + 60.4k/R7).

PARAMETER CONDITIONS VALUE

Input Voltage Range 5.5V ~ 16V

Output Voltage VOUT1 VIN = 4.5V ~ 15V, IOUT1 = 0A ~ 13A 3.3V ±1.5%

Output Voltage VOUT2 VIN = 4.5V ~ 15V, IOUT2 = 0A ~ 13A 1.5V ±1.5%

Per-Channel Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT and Thermal

Conditions.

13A

Default Operating Frequency 750kHz

Resistor Programmable Frequency Range 250kHz to 780kHz

External Clock Sync. Frequency Range 400kHz to 780kHz

Efficiency of Channel 1 VIN = 12V, VOUT2 = 3.3V, IOUT2 = 13A, fSW = 750kHz 91.8% See Figure 3

Efficiency of Channel 2 VIN = 12V, VOUT1 = 5V, IOUT1 = 13A, fSW = 750kHz 93.9% See Figure 4

Load Transient of Channel 1 VIN = 12V, VOUT2 = 3.3V, ISTEP = 6.5A ~ 13A See Figure 5

Load Transient of Channel 2 VIN = 12V, VOUT1 = 5V, ISTEP = 6.5A ~ 13A See Figure 6

performance summary

Specifications are at TA= 25°C

dc2268abfa

DEMO MANUAL DC2268A-B

Quick start proceDure

Figure 2. Test Setup of DC2268A-B

Table 2. DC2268A Demo Circuit

DEMO BOARD NUMBER µMODULE REGULATOR ON THE BOARD OUTPUT CURRENT

DC2268A-A LTM4620 13A,13A

DC2268A-B LTM4620A 13A,13A

DC2268A-C LTM4628 8A, 8A

DC2268A-D LTM4630 18A,18A

DC2268A-E LTM4630-1 18A,18A

DC2268A-F LTM4630A 18A, 18A

DC2268A-G LTM4631 10A, 10A

dc2268abfa

DEMO MANUAL DC2268A-B

dc2268ab F05

3.3V OUTPUT (20MHz BW) [20mV/DIV]

6.5A TO 13A LOAD STEP

Quick start proceDure

Figure 3. Measured Efficiency on Channel 1

(VOUT1 = 3.3V, fSW = 750kHz, Channel 2 Disabled)

Efficiency, 3.3V Efficiency, 5V

Figure 4. Measured Efficiency on Channel 2

(VOUT2 = 5V, fSW = 750kHz, Channel 1 Disabled)

ILOAD (A)

EFFICICENCY (%)

100

75 84 12

dc2268ab F03

62 1073 1151 9

VIN = 12V

fSW = 750kHz

89.1

75.2

84.6

87.5

90.4

91.1 91.8

91.6 92

92 92 91.9

91.8

100

75 84 12

62 1073 1151 9

91.4

77.4

93.9

90.2

92.4 93.7

93.5 94

93.9

ILOAD (A)

EFFICICENCY (%)

dc2268ab F04

VIN = 12V

fSW = 750kHz

Figure 5. Measured Channel 6.5A to 13A Load Transient (VIN = 12V, VOUT1 = 3.3V)

dc2268abfa

DEMO MANUAL DC2268A-B

dc2268ab F06

5V OUTPUT (20MHz BW) [20mV/DIV]

6.5A TO 13A LOAD STEP

Figure 7. Thermal Performance at VIN = 12V, VOUT1 = 3.3V/8A,

VOUT2 = 5V/8A, fSW = 750kHz, TA= 23°C, 200LFM Airflow

Quick start proceDure

Figure 6. Measured Channel 2 6.5A to 13A Load Transient (VIN = 12V, VOUT2 = 5V)

dc2268abfa

DEMO MANUAL DC2268A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 6 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 22µF 10% 25V X5R AVX 12103D226KAT2A

2 2 CO1, CO5 CAP, 7343 330µF 20% 6.3V POSCAP PANASONIC 6TPF330M9L

3 4 CO2, CO3, CO4, CO6 CAP, 1210 100µF 10% 6.3V X5R AVX 12106D107KAT2A

4 1 C6 CAP, 0603 4.7µF 20% 6.3V X5R AVX 06036D475MAT2A

5 1 C7 CAP, 0603 47pF 5% 50V C0G / NP0 AVX 06035A470JAT2A

6 2 C8, C14 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT2A

7 1 C15 CAP, 0603 33pF 5% 50V C0G AVX 06035A330JAT2A

8 2 C16, C17 CAP, 0603 10µF 20% 25V X5R TDK C1608X5R1E106M080AC

9 2 C18, C20 CAP, 0603 22µF 20% 6.3V X5R TDK C1608X5R0J226M080AC

10 1 L1 IND, 1.0µH COILCCRAFT XAL5030-102MEC

11 2 R2, R22 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

12 3 R3, R5, R14 RES, 0603 100Ω 5% 0.1W VISHAY CRCW0603100RJNEA

13 1 R4 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA

14 2 R6, R17 RES, 0603 10k 5% 0.1W VISHAY CRCW060310K0JNEA

15 1 R7 RES, 0603 13.3k 1% 0.1W VISHAY CRCW060313K3FKEA

16 1 R9 RES, 0603 0Ω VISHAY CRCW06030000Z0EA

17 1 R15 RES, 0603 191k 1% 0.1W VISHAY CRCW0603191KFKEA

18 1 R18 RES, 0603 8.25k 1% 0.1W VISHAY CRCW06038K25FKEA

19 3 R24, R25, R30 RES, 0603 10Ω 5% 0.1W VISHAY CRCW060310R0JNEA

20 1 U1 IC, VOLTAGE REGULATOR LGA LINEAR TECH. LTM4620AEV#PBF

Additional Demo Board Circuit Components

10 C1, C2, C3, C4, C5, C9, C10, C11, C12,

C13

CAP, 0603 OPTION OPTION

2 0 R1, R8, R10, R11, R12, R13, R16, R19,

R20, R21, R23, R26, R27, R28, R29

RES, 0603 OPTION OPTION

3 0 R31, R32 RES, 2512 OPTION OPTION

Hardware: For Demo Board Only

1 1 J1 CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV--TR

dc2268abfa

DEMO MANUAL DC2268A-B

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



OPTIONAL JUMPER FOR

1 OUTPUT CONFIGURATION

3.3V AT 13A

5V AT 13A



PGOOD1

RUN1

VOS1+

PGOOD2

COMP1

TRACK1

VFB1

VFB2

COMP2

RUN2

VFB2

VFB1

VOS1-_R

VOS1+_R

VOS2+_R

VOUT1

VOUT2 VOUT2

VOUT1

RUN2

RUN1

VOS1-_R

VOS1+_R

VOS2+_R

VOS2+

TRACK2

VOS1-

VOS1+

VIN2

INTVCC

VOUT1

VOS1+

VOS1-

INTVCC

VOUT2

EXTVCC

VIN1

VIN2

VOS2+

INTVCC VIN2

INTVCC

VIN1 VIN1

VOUT1 VOUT2

VOUT1

VOUT2

RUN1 RUN2

TRACK1 TRACK2

VFB1 VFB2

COMP1 COMP2

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 2268A-B

Friday, May 01, 2015

HIGH EFFICIENCY, STEP-DOWN, MODULE

N/A

LTM4620AEV

` \

Yingyi Y.

REGULATOR

C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN 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 2268A-B

Friday, May 01, 2015

HIGH EFFICIENCY, STEP-DOWN, MODULE

N/A

LTM4620AEV

` \

Yingyi Y.

REGULATOR

C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN 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 2268A-B

Friday, May 01, 2015

HIGH EFFICIENCY, STEP-DOWN, MODULE

N/A

LTM4620AEV

` \

Yingyi Y.

REGULATOR

C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN

OPT

CIN1

22uF

25V

1210

OPT

R11

OPT

CIN2

22uF

25V

1210

CO1

330uF

6.3V

7343

R31 OPT

OPT

R23

OPT

R32

OPT

CIN6

22uF

25V

1210

OPT

47pF

R21

OPT

R12

OPT

R15

191K 1%

CO6

100uF

6.3V

1210

CO2

100uF

6.3V

1210

LTM4620AEV

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

R24 10

CIN4

22uF

25V

1210

C11 OPT

OPT

R16

OPT

R10

OPT

R14

100

VIN

GND

N/A

GND

VOS1+

GND

VOS1-

RUN1

VOS2+

RUN2

VOUT1

VOUT2

R20

OPT

R22

CIN3

22uF

25V

1210

R13

OPT

R17

10K

CO5

330uF

6.3V

13.3K

OPT

L1 1uH

C16

10uF

25V R2

10K

C15

33pF

C18

22uF

CO4

100uF

6.3V

1210

OPT

C17

10uF

25V CO3

100uF

6.3V

1210

CIN5

22uF

25V

1210

R25 10

R26

OPT

121K

0.1uF

C12

OPT

C13

OPT

100

C20

22uF

C10

OPT

4.7uF

6.3V

C14

0.1uF

R30 10

R28

OPT

R19

OPT

R18

8.25K 1%

R27

OPT

R29

OPT

dc2268abfa

DEMO MANUAL DC2268A-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0615 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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