Linear Technology DC2249B Quick setup guide

dc2249bf

DEMO MANUAL DC2249B

Description

LTM4622EV

Ultrathin Dual 2.5A Step-Down

µModule Regulator

Demonstration circuit 2249B features the LT M

4622EV

µModule

regulator, a tiny low profile high performance

high efficiency dual step-down regulator. The LTM4622

has an operating input voltage range of 3.6V to 20V and

is able to provide an output current of up to 2.5A for each

channel.Eachoutput’svoltageisprogrammablefrom0.6V

to 5.5V. The LTM4622 is a complete DC-DC point of load

regulator in a low profile thermally enhanced 6.25mm ×

6.25mm× 1.82mm LGA package requiring only a few input

and output capacitors. Output voltage tracking is available

through the TRACK/SS pin for supply rail sequencing. L, LT, LTC, LTM, Linear Technology, µModule, Burst Mode and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

performance summary

External clock synchronization is available through the

SYNC/MODE pin. For high efficiency at low load currents

the MODE pin jumper (JP3) selects the Burst Mode

op-

tion for operation in less noise sensitive applications. The

LTM4622 data sheet must be read in conjunction with this

demo manual for working on or modifying demo circuit

2249B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2249B

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 4V to 20V

Output Voltage VOUT1, VOUT2 Programmable with FB Pin Resistors 3.3VDC, 1.2VDC

Maximum Continuous Output Current Each

Phase

Derating is Necessary for Certain Operating Conditions. See

Data Sheet for Details

2.5ADC

Default Operating Frequency 1MHz

Efficiency VIN = 12V, VOUT1 = 3.3V, IOUT = 2.5A, fSW = 2MHz

VIN = 12V, VOUT2 = 1.2V, IOUT = 2.5A, fSW = 1MHz

87.5%. See Figure 2

76.7%. See Figure 2

BoarD photo

dc2249bf

DEMO MANUAL DC2249B

Quick start proceDure

Demonstration circuit 2249B is an easy way to evaluate

the performance of the LTM4622. Please refer to Figure 1

for test setup connections and follow the procedure below.

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

tions for a typical application for 3.3VOUT and 1.2VOUT

rails:

JP1 JP2 JP3

RUN1 RUN2 MODE

ON ON CCM

2. Before powering up the input supply and loads, preset

the input voltage supply to be between 4V to 20V. Preset

the load current for each output rail to 0A.

3. With power off, connect the loads, input voltage supply

and meters as shown in Figure 1.

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

ters for each output rail should display the programmed

output voltage ± 2%.

5. Once the proper output voltages are established, ad-

just the load current on each rail within the 0A to 2.5A

range and observe each output rail’s load regulation,

efficiency, and other parameters.

6. To observe increased light load efficiency place the

mode pin jumper (JP3) in the BURST position.

Note: Demonstration circuit 2249B is designed to exhibit

the wide output voltage range of the LTM4622. In order

to keep inductor current ripple within reasonable limits

it is recommended to increase programmed switching

frequency for higher output voltages. The programmed

switching frequency for data provided in this manual is

consistent with switching frequency recommendations

corresponding to the programmed output voltage. Please

refer to the LTM4622 data sheet for more details regard-

ing recommended switching frequency for your particular

application.

dc2249bf

DEMO MANUAL DC2249B

Quick start proceDure

–

+–

+ –

LOAD

0A TO 2.5A

–

+–

LOAD

0A TO 2.5A

–

AVIN

+ –

DC2249b F01

Figure 1. Test Setup

dc2249bf

DEMO MANUAL DC2249B

Figure 2. Measured Supply Efficiency at 12VIN and 5VIN

Quick start proceDure

LOAD CURRENT (A)

EFFICIENCY (%)

70 10.5 2 2.51.5

LOAD CURRENT (A)

EFFICIENCY (%)

70 10.5 2

DC2249b F02

2.51.5

VOUT = 3.3V

(2MHz)

12VIN CCM 5VIN CCM

VOUT = 1.2V

(1MHz)

VOUT = 3.3V

(2MHz)

VOUT = 1.2V

(1MHz)

dc2249bf

DEMO MANUAL DC2249B

Figure 3. Measured Load Transient Response (1A to 2A Load Step) Figure 4. Measured Load Transient Response (1A to 2A Load Step)

Figure 5. Thermal Capture at Full Load Natural Convection

Quick start proceDure

VIN (V) VOUT (V) COUT

12 1.2 1 × 22µF + 1 × 47µF

VIN (V) VOUT1 (V), IOUT1 (A) VOUT2 (V), IOUT2 (A) fSW (MHz) TAMBIENT (°C)

12 3.3, 2.5 1.2, 2.5 2 22

VIN (V) VOUT (V) COUT

12 3.3 1 × 22µF + 1 × 47µF

VOUT: 50mV/DIV

1A DC

dc2249bf

DEMO MANUAL DC2249B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, X5R, 2.2µF, 10V, 10%, 0603 MURATA, GRM188R61A225KE34D

2 2 C3, C13 CAP, X5R, 22µF, 25V, 20%, 0805 MURATA, GRM21BR61E226ME-44L

3 2 C16, C29 CAP, X5R, 22µF, 6.3V, 20%, 0805 MURATA, GRM21BR60J226ME39L

4 2 C20, C23 CAP, X5R, 47µF, 6.3V, 20%,1206 MURATA, GRM31CR60J476ME19L

5 2 C21, C24 CAP, X5R, 0.1µF, 25V, 10%, 0603 MURATA, GRM188R61E104KA01D

6 1 R11 RES, CHIP, 60.4k, 1/16W, 1%, 0603 VISHAY, CRCW060360K4FKEA

7 1 R20 RES, CHIP, 13.3k, 1/16W, 1%, 0603 VISHAY, CRCW060313K3FKEA

8 1 U1 IC, LTM4622EV, LGA 25-6.25X6.25 LINEAR TECHNOLOGY, LTM4622EV#PBF

Additional Demo Board Circuit Components

2 1 C2 CAP, X5R, 10µF, 25V, 10%, 0805 TAIYO YUDEN, TMK212BBJ106KGHT

4 3 C4, C6, C18 CAP, X5R, 1µF, 10V, 10%, 0603 MURATA, GRM188R61A105KA61D

5 0 C8, C15, C22, C28 CAP, 0603 OPTION

6 1 C10 CAP, X5R, 22µF, 25V, 10%, 7343 SANYO, 25TQC22MV

10 0 C17, C25 CAP, 7343 OPTION

18 1 Q1 XSTR, SUD50N04-8M8P-4GE3 MOSFET TO-252 VISHAY, SUD50N04-8M8P-4GE3

19 1 RS1 RES, CHIP, 0.05Ω, 1/4W, 1%, 1206 VISHAY, WSL1206R0500FEA

20 0 R2, R10, R12, R14, R16 TO

R19, R21, R22, R23, R26 TO

R29

CAP, 0603 OPTION

21 1 R3 RES, CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA

22 4 R9, R15, R24, R25 RES, CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA

24 1 R13 RES, CHIP, 0, 1/16W, 1%, 0603 VISHAY, CRCW06030000Z0EA

Hardware: For Demo Board Only

13 14 E1 TO E14 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0

14 2 JP1, JP2 HEADER, 1X3 0.079 SULLINS, NRPN031PAEN-RC

15 1 JP3 HEADER, 2X3 0.079 SULLINS, NRPN032PAEN-RC

16 3 XJP1, XJP2, XJP3 SHUNT SAMTEC 2SN-BK-G

17 2 J1, J2 CONN, BNC, 5PINS CONNEX, 112404

28 4 STAND OFF STAND OFF, SNAP ON, 0.375" TALL KEYSTONE_8832

dc2249bf

DEMO MANUAL DC2249B

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

4V - 20V

GND

OFF

RUN 1

PGOOD1

1.2V / 2.5A MAX

C10, IS AN OPTIONAL CAPACITOR. IT IS INSERTED

TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE

DUE TO LONG INPUT LEADS. ON A NORMAL, TYPICAL

PCB, WITH SHORT TRACES, THE CAPACITOR IS

NOT NEEDED.

VIN

DUAL 2.5A STEP-DOWN µMODULE REGULATOR

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603

TRACK2

TRACK1

3.3V / 2.5A MAX

OFF

RUN 2

CLK SYNC CLK

PGOOD2

OPTIONAL JUMPERS FOR PARALLEL OPERATION

LE T

SAM Y.

VIN

GND

VOUT2

GND

VOUT1

GND

VIN

VOUT2

COMP2

SS2

COMP1

SS1

VOUT1

RUN1

FB1 FB2 COMP1 COMP2 SS1 SS2 RUN1 RUN2 VOUT2

FB2

RUN2

FB1

VOUT1

INTVCC

VIN

INTVCC

VIN

INTVCC

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

LTM4622EV

Thursday, May 26, 2016 1 1

N/A

DEMO CIRCUIT 2249B

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

LTM4622EV

Thursday, May 26, 2016 1 1

N/A

DEMO CIRCUIT 2249B

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

LTM4622EV

Thursday, May 26, 2016 1 1

N/A

DEMO CIRCUIT 2249B

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

PRODUCTION2 3-31-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

PRODUCTION2 3-31-15

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

PRODUCTION2 3-31-15

R28

OPT

R28

OPT

C21

0.1uF

C21

0.1uF

C11

OPT

1210

C11

OPT

1210

E2E2

R18

OPT

R18

OPT

E11E11

C13

22uF

0805

C13

22uF

0805

R11

60.4K

R11

60.4K

R15

100K

R15

100K

JP1JP1

E5E5

JP3

MODE

CCM

BURST

JP3

MODE

CCM

BURST 1 2

3 4

C15

OPT

C15

OPT

2.2uF

10V

2.2uF

10V

E4E4

C23

47uF

1206

C23

47uF

1206

R22

OPT

R22

OPT

R29

OPT

1206

R29

OPT

1206

E8E8

OPT

R14

OPT

R14

OPT

22uF

25V

0805

22uF

25V

0805

C17

OPT

C17

OPT

R13

E14E14

C20

47uF

1206

C20

47uF

1206

C16

22uF

6.3V

0805

C16

22uF

6.3V

0805

C26

OPT

1210

C26

OPT

1210 C28

OPT

C28

OPT

R21

OPT

R21

OPT

E10E10

E1E1

E9E9

OPT

R24

100K

R24

100K

R27

OPT

R27

OPT

100K

C22

OPT

C22

OPT

E7E7

C25

OPT

C25

OPT

R19

OPT

R19

OPT

R25

100K

R25

100K

LTM4622EV

FREQ

MODE

FB2 A4

TRACK/SS2 A3

COMP2 A5

RUN1

PGOOD1 D4

VOUT2 A1

VIN B3

VIN A2

INTVCC C3

VOUT1

VIN D3

VOUT2 B1

GND

VIN E2

VOUT1

PGOOD2 B4

COMP1

FB1

RUN2 B2

TRACK/SS1

E6E6

R20

13.3K

R20

13.3K

C10

22uF

25V

C10

22uF

25V

E13E13

JP2JP2

10uF

25V

0805

10uF

25V

0805

R12

OPT

R12

OPT

C14

OPT

1210

C14

OPT

1210

R17

OPT

R17

OPT

C24

0.1uF

C24

0.1uF

R10

OPT

R10

OPT

R23

OPT

R23

OPT

R16

OPT

R16

OPT

E3E3

R26

OPT

R26

OPT

C29

22uF

6.3V

0805

C29

22uF

6.3V

0805

dc2249bf

DEMO MANUAL DC2249B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0217 • 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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