Analog Devices DC2665B-B Guida rapida alla configurazione

DEMO MANUAL DC2665B-B

Rev. 0

DESCRIPTION

LTM4638

20VIN, 15A Step-Down

µModule Regulator

Demonstration circuit 2665B-B features the LTM

4638

µModule

regulator, a high performance, high effi-

ciencystep-down regulator. The LTM4638 is a complete

DC/DC point-of-load regulator in a thermally enhanced

6.25mm × 6.25mm × 5.02mm BGA package. The

LTM4638 has an operating input voltage range of 3.1V to

20V and provides an output current up to 15A. The output

voltage is programmable from 0.6V to 5.5V and can be

remotely sensed. The stacked inductor design improves

thermal dissipation and significantly reduces the package

All registered trademarks and trademarks are the property of their respective owners.

area. Output voltage tracking is available through the

TRACK/SS pin for supply rail sequencing. External clock

synchronization is available through the SYNC/MODE pin.

For high efficiency at low load currents, select discon-

tinuous current mode(DCM) operation using the MODE

jumper (JP7) in less noise sensitive applications. Refer

to the LTM4638 data sheet in conjunction with this demo

manual for working on or modifyingthe DC2665B-B.

Design files for this circuit board are available.

BOARD PHOTO

Part marking is either ink mark or laser mark

DEMO MANUAL DC2665B-B

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2665B-B is an easy way to evaluate

the performance of the LTM4638EY. Refer to Figure1 for

test setup connections and use the following procedure.

1. With the power off, place the jumpers in the following

positions:

JP8 JP7 JP1 TO JP6

RUN MODE VOUT Select

ON CCM 1V

2. Before connecting the input supply, load, and meters,

preset the input voltage supply between 3.1V and 20V.

Preset the load current to 0A.

3. With the power off, connect the load, input voltage

supply and meters as shown in Figure1.

4. Turn on the input power supply. The output voltage

meters for each phase display the ±1.2% programmed

output voltage .

5. Once the proper output voltage is established, adjust

the load current in the 0A to 15A range and observe

the load regulation, efficiency, and other parameters.

Measure the output voltage ripple across the furthest

output cap with a BNC cable and oscilloscope from J2.

6. Place the MODE pin jumper (JP7) in the DCM position

to observe increased light load efficiency.

For optional load transient testing, an onboard

transient circuit is provided to measure transient

response. Place a positive pulse signal between the

IO_STEP_CLK (E10) pin and GND pin. The pulse

amplitude sets the load step current amplitude. Keep

the pulse width short (<1ms) and the pulse duty cycle

low (<15%) to limit the thermal stress on the load

transient circuit. Monitor the load step with a BNC

connected to J1 (5mV/A).

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 3.1 20 V

Output Voltage, VOUT Jumper Selection on JP1

Jumper Selection on JP2

Jumper Selection on JP3

Jumper Selection on JP4

Jumper Selection on JP5

0.98

1.47

2.45

3.23

4.9

1.0

1.5

2.5

3.3

5.0

1.02

1.53

2.55

3.37

5.1

Maximum Continuous Output Current Derating Is Necessary for Certain Operating Conditions

(See Data Sheet for Details)

15 A

Default Operating Frequency 600 kHz

Efficiency VIN = 12V, VOUT = 1V, IOUT = 15A 85.3 %

DEMO MANUAL DC2665B-B

Rev. 0

Figure1. Test Setup of DC2665B-B

QUICK START PROCEDURE

NOTES:

1. To achieve the minimum output ripple voltage, optimize the operation frequency at different input and output volt-

ages. Suggested operation frequencies at different voltages are shown in Table1. Adjust the operation frequency

by changing the value of RfSET (R5). Refer to the LTM4638 data sheet for detailed calculation of RfSET (R5).

Table1. Suggested Operation Frequencies

3.3VIN 5VIN 12VIN

VOUT (V) 1 1.2 1.5 1.8 2.5 1 1.2 1.5 1.8 2.5 3.3 1 1.2 1.5 1.8 2.5 3.3 5

fSW (kHz) 500 500 500 500 500 600 600 600 800 800 800 600 600 800 800 1000 1000 1500

For applications that require small output voltage ripple, add shunt-through three-terminal capacitors on the output

at C41 and C42.

DEMO MANUAL DC2665B-B

Rev. 0

QUICK START PROCEDURE

Figure2. Measured Supply, CCM Efficiency vs Load Current

Figure3. Measured Thermal Capture at 12V

, I

OUT

=15A at 25°C Ambient with No Airflow

(a) 3.3VIN (b) 5VIN (c) 12VIN

dc2665bb F02a

LOAD CURRENT (A)

EFFICIENCY (%)

1VOUT, 500kHz

1.2VOUT, 500kHz

1.5VOUT, 500kHz

1.8VOUT, 500kHz

2.5VOUT, 500kHz

dc2665bb F02b

LOAD CURRENT (A)

EFFICIENCY (%)

1VOUT, 600kHz

1.2VOUT, 600kHz

1.5VOUT, 600kHz

1.8VOUT, 800kHz

2.5VOUT, 800kHz

3.3VOUT, 800kHz

LOAD CURRENT (A)

EFFICIENCY (%)

dc2665bb F02c

1VOUT, 600kHz

1.2VOUT, 600kHz

1.5VOUT, 800kHz

1.8VOUT, 800kHz

2.5VOUT, 1MHz

3.3VOUT, 1MHz

5VOUT, 1.5MHz

(a) 1VOUT, 600kHz (b) 5VOUT, 1.5MHz

DEMO MANUAL DC2665B-B

Rev. 0

Figure4. Load Transient (7.5A to 11.25A) Response Waveform at 12VIN

(a) 1VOUT

(b) 5VOUT

dc2665bb F04a

50μs/DIV

VOUT(PK-PK) = 55mV

VOUT

50mV/DIV

ILOAD

2A/DIV

dc2665bb F04b

50μs/DIV

VOUT(PK-PK) = 66mV

VOUT

50mV/DIV

ILOAD

2A/DIV

QUICK START PROCEDURE

DEMO MANUAL DC2665B-B

Rev. 0

Figure5. Tested VOUT AC Ripple at 12VIN, IOUT = 15A , VOUT Ripple Is Tested Across C12

QUICK START PROCEDURE

(a) 1VOUT, 600kHz, Full Bandwidth at 500MHz (b) 1VOUT, 600kHz, 20MHz Bandwidth

dc2665bb F05a

1μs/DIV

VOUT(PK-PK) = 37mV

VOUT

(FULL BW)

10mV/DIV

dc2665bb F05b

1μs/DIV

VOUT(PK-PK) = 5.6mV

VOUT

(20MHz BW)

10mV/DIV

dc2665bb F05c

1μs/DIV

VOUT(PK-PK) = 36.8mV

VOUT

(FULL BW)

10mV/DIV

dc2665bb F05d

1μs/DIV

VOUT(PK-PK) = 7.2mV

VOUT

(20MHz BW)

10mV/DIV

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C6, C31 CAP., 2.2μF, X7R, 10V, 20%, 0603 TDK, C1608X7R1A225M080AC

2 3 C2, C3, C38 CAP., 22μF, X5R, 25V, 10%, 1206 AVX, 12063D226KAT2A

3 1 C33 CAP., 1μF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E105K080AB

4 4 C5, C11, C12, C30 CAP., 220μF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J227ME11L

5 1 C7 CAP., 0.1μF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A

6 1 C8 CAP., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A

7 1 C10 CAP., 220μF, ALUM HYB, 35V, 20% SUN ELECTRONIC, 35HVH220M

8 1 C18 CAP., 1μF, X7R, 10V, 20%, 0603 AVX, 0603ZC105MAT2A

9 1 C29 CAP., 0.022μF, X7R, 50V, 10%, 0603 KEMET, C0603C223K5RAC7867

10 1 C34 CAP., 1μF, X7R, 6.3V, 10%, 0402 MURATA, GRM155R70J105KA12D

DEMO MANUAL DC2665B-B

Rev. 0

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

11 1 R3 RES., 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEAC

12 1 R4 RES., 90.9k, 0.5%, 1/10W, 0603 SUSUMU, RG1608P-9092-D-T5

13 1 R6 RES., 40.2k, 0.5%, 1/10W, 0603 SUSUMU, RG1608P-4022-D-T5

14 1 R14 RES., 13.3k, 0.5%, 1/10W, 0603 SUSUMU, RG1608P-1332-D-T5

15 1 R15 RES., 19.1k, 0.5%, 1/10W, 0603 SUSUMU, RG1608P-1912-D-T5

16 1 R24 RES., 8.25k, 0.5% 1/10W 0603 SUSUMU, RG1608P-8251-D-T5

17 2 R8, R16 RES., 100k, 1%, 1/10W, 0603 STACKPOLE ELECTRONICS, RMCF0603FG100K

18 2 R9, R10 RES., 0Ω,5%, 1/16W, 0402 ROHM, SFR01MZPJ000

19 1 R17 RES., 0Ω, 1/10W, JUMPER, 0603 YAGEO, RC0603FR-070RL

20 1 R7 RES., 150k, 5%, 1/10W, 0603 YAGEO, RC0603JR-07150KL

21 1 Q1 XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3

22 1 RS2 RES., SENSE, 0.005Ω, 1%, 1W, 2512 VISHAY, WSL25125L000FEA

23 1 U1 IC, 20V, 15A STEP-DOWN μModule REG ANALOG DEVICES, INC. LTM4638EY#PBF

Additional Demo Board Circuit Components

24 0 C4, C9, C15, C19, C36, C43, C44 CAP., OPTION, 0603 OPTION

25 0 C16, C22-C24 CAP., OPTION, 0805 OPTION

26 0 C17, C20, C21 CAP., OPTION, 1206 OPTION

27 0 C25-C28 CAP., OPTION, 1210 OPTION

28 0 C39 CAP., OPTION, 0805, 3-PC Pad MURATA, NFM21PC104R1E3D

29 0 C40 CAP., OPTION, 1206, 3-PC Pad TDK, YFF31HC2A104MT000N

30 0 C41 CAP., OPTION, 0603, 3-PC Pad MURATA, NFM18CC223R1C3D

31 0 C42 CAP., OPTION, 1206, 3-PC Pad MURATA, NFM31PC276B0J3L

32 0 R18 RES., OPTION, 0805 OPTION

33 0 C35 CAP., OPTION, 0805 OPTION

34 0 R21-R23 RES., OPTION, 0402 OPTION

35 0 R1, R2, R5, R11-R13, R19, R20 RES., OPTION, 0603 OPTION

36 0 L1 IND.,OPTION,1812 OPTION

37 0 L2 IND.,OPTION, 4mm × 4mm, AEX-Q200 COILCRAFT, XEL4020-800MEC

Hardware: For Demo Board Only

38 10 E1, E3, E5, E6, E8-E12, E14 TESTPOINT, TURRET 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0

39 4 E2, E4, E7, E13 JACK, BANANA KEYSTONE, 575-4

40 2 J1, J2 CONN, BNC, 5 PINS AMPHENOL RF, 112404

41 5 JP1-JP6 HEADER, 1×2, 2mm SULLINS, NRPN021PAEN-RC

42 1 JP7 HEADER, 2×3, 2mm SULLINS, NRPN032PAEN-RC

43 1 JP8 HEADER, 1×3, 2mm SAMTEC, TMM-103-02-L-S

44 4 MP1-MP4 STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON)

45 3 XJP1, XJP7, XJP8 SHUNT, 2mm SAMTEC, 2SN-BK-G

PARTS LIST

DEMO MANUAL DC2665B-B

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

CLKIN

CCM

DCM

3.1V - 20V

NOTES: UNLEES OTHERWISE SPECIFIED,

1. ALL RESISTORS AND CAPACITORS ARE 0603.

OFF

OPT EMI FILTER

REVISION HISTORY

DATEDESCRIPTION

S J

REV APPROVED

PRODUCTION

ECO

11/15/22

OPT

20V STEP-DOWN µMODULE REGULATOR

LTM4638EY#PBF

- A

VERSION

LTM4626EY#PBF

- B

8.25k

40.2k

R15R4

90.9k

40.2k 19.1k

R14 R24R6U1

19.1k

- C

90.9k 13.3k

LTM4657EY#PBF 60.4k 31.1k 15k

13.3k

10.7k

8.25k

6.65k

VOSNS-

VOSNS+

VIN

VOSNS-

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY T O ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED

SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S

RESPONSIBILITY TO VERIF Y PROPER AND RELIABLE

OPERATION IN THE ACTUAL APPLICATION. CO MPONENT

SUBSTITUTION AND PRINTED CIRCUIT BO ARD LAYOUT

MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE

OR RELIABILIT Y. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

ANALOG

DEVICES

Sun J.

LTM46XXEY

DC2665B

710-DC2665B_REV 01

N/A Tuesday, November 15, 2022

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY T O ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED

SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S

RESPONSIBILITY TO VERIF Y PROPER AND RELIABLE

OPERATION IN THE ACTUAL APPLICATION. CO MPONENT

SUBSTITUTION AND PRINTED CIRCUIT BO ARD LAYOUT

MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE

OR RELIABILIT Y. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

ANALOG

DEVICES

Sun J.

LTM46XXEY

DC2665B

710-DC2665B_REV 01

N/A Tuesday, November 15, 2022

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY T O ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

SKU NO.

IC NO.

ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED

SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S

RESPONSIBILITY TO VERIF Y PROPER AND RELIABLE

OPERATION IN THE ACTUAL APPLICATION. CO MPONENT

SUBSTITUTION AND PRINTED CIRCUIT BO ARD LAYOUT

MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE

OR RELIABILIT Y. CONTACT ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

ANALOG

DEVICES

Sun J.

LTM46XXEY

DC2665B

710-DC2665B_REV 01

N/A Tuesday, November 15, 2022

E13

GND

E14

GND

2.2uF

10V

C41

1 3

C40

*U1

FREQ

PHMODE

TSENSE+ A6

TRACK/SS E2

COMPa D1

RUN

PGOOD B5

VOUT A2

GND

C4 INTVCC B3

CLKOUT F2

MODE/CLKIN

VIN

G4 VOUT1 G1

VOUT A3

VOUT1 G3

VOUT1 F3

GND

VOUT A1

VIN

GND

VIN

VOUTS- C2

VOUTS+ B1

FB C1

COMPb F1

TSENSE- A7

SW B7

SGND

VOUT A4

VOUT A5

VOUT1 G2

C19

OPT

0.1uF

25V

22uF

25V

1206

C15

OPT

VIN

TP2

VIN EMI

L1 OPT

1812

JP7

MODE

1 2

3 4

5 6

R18

OPT

0805

C38

22uF

25V

1206

JP2

1.5V

*R6

C35

OPT

0805

C23

OPT

C20

OPT

1206

2.2uF

10V

TP3

GND EMI

C25

OPT

1210

TRACK

R17

GND

C17

OPT

1206

*R4

C21

OPT

1206

22uF

25V

1206

E10

IO STEP CLK

VOUT

C26

C29

0.022uF

0603

50V

R21

OPT

SUD50N04-8m8P

VOSNS-

E11

GND

CLKIN

C39

1 3

C16

OPT

0805

C10

220uF

35V

VIN

C28

OPT

*R15

C33

1uF

25V

JP8

RUN

R7 150k

100k

JP5

5.0V

100pF

25V

C31

2.2uF

10V

*R14

OPT

C42

OPT

C12

220uF

6.3V

1206

R19

OPT

R10

C44

OPT

220uF

6.3V

1206

C34

1uF

0402

6.3V

X7R

10k

OPT

0603

C22

JP3

2.5V

JP6

SET

R20

OPT

C24

0805

C30

220uF

6.3V

1206

OPT

*R24

C11

220uF

6.3V

1206

R11

OPT

0603

R22

OPT

0402

PGOOD

C43

OPT

R12

OPT

C18

1uF

10V

JP1

1.0V

RS2

0.005

2512

CLKOUT

R16

100k

R13

OPT

C27

OPT

1210

E12

VOSNS+

IO STEP

R23

OPT

VOUT

C36

OPT

JP4

3.3V

VOUT

VOSNS+

VOSNS-

CLKOUT

VIN

VOUT

DEMO MANUAL DC2665B-B

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

REVISION HISTORY

DEMO BOARD

REV

DEMO MANUAL

REV DATE DESCRIPTION PAGE NUMBER

DC2665A-B 0 02/19 Initial Release. —

DC2665B-B 0 12/22 DC2665B-B replaces DC2665A-B for low HF VOUT ripple. —

DEMO MANUAL DC2665B-B

Rev. 0

 ANALOG DEVICES, INC. 2023

2/23

www.analog.com

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and

conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation

Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)

and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to

Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and

agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted

is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third

Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is

NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all

be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of

use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile

or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited

to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS

Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF

LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY

DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE

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Indice

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