Linear Technology DC1472A Quick setup guide

dc1472af

DEMO MANUAL DC1472A

DESCRIPTION

LTM4618EV:

6A Step-Down Power

µModule Regulator

Demonstration circuit 1472 features the LTM

4618EV

μModule

regulator, a complete high efﬁciency synchro-

nous buck regulator. The DC1472 input range is from 4.5V

to 26.5V and is capable of delivering up to 6A of output

current. However, current derating maybe necessary under

certain VIN, VOUT, frequency and thermal conditions. The

output voltage for the board is jumper programmable from

1.2V to 5V and can be set as low as 0.8V, the reference

voltage of the LTM4618EV.

Layout is simple, requiring only a few bulk input and output

capacitors externally. The TRACK/SS pin allows the user to

program the output voltage ramp-up and ramp-down, as

well as coincidentally or ratiometrically track an external

voltage. The LTM4618EV may be enabled or disabled by

the RUN pin. The MODE jumper (JP3) is available to select

L, LT, LTC, LTM, μModule, Burst Mode, 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

frompulse-skipping orBurst Mode

operationfor improved

efﬁciency at light load. DC1472 has a default switching

frequency of 500 kHz and is synchronizable to an external

clock from 250 kHz up to 750 kHz. These features and the

availability of the LTM4618EV in a compact 9mm ×15mm

×4.32mm LGA package make the demonstration circuit

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

tion applications. The LTM4618 data sheet must be read

in conjunction with this demo manual for working on or

modifying the demo circuit 1472A.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

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dc1472af

DEMO MANUAL DC1472A

QUICK START PROCEDURE

PERFORMANCE SUMMARY

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4.5V to 26.5V

Jumper Selectable Output Voltage, VOUT VIN = 4.5V – 26.5V, IOUT = 0A – 6A 1.2V, 1.5V, 1.8V, 2.5V, 3.3V or 5V ±2%

Maximum Continuous Output Current Derating is Necessary for Certain Operating Conditions.

See Data Sheet for Details

6ADC

Default Operating Frequency R3 = 10kΩ, R4 = 3.16kΩ 500kHz

External Clock Sync. Frequency Range 250kHz to 750kHz

Efﬁciency VIN = 12V, VOUT = 2.5V, IOUT = 6A 88.7% See Figure 2

Demonstration circuit 1472 is easy to set up to evaluate the

performance of the LTM4618EV. Please refer to Figure1

for proper measurement equipment setup and follow the

procedure below.

1. 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 be 0V. Place jumpers in the following

positions for a typical 1.5VOUT application:

JP6 JP3 JP4 JP2

VOUT Select MODE RUN TRACK/SS

1.5V CCM OFF SS

2. Turn on the power at the input. Increase VIN to 12V

(Caution: Do not hot plug the input supply or apply

more than the rated maximum voltage of 26.5V to the

board or the part may be damaged).

3. Set the RUN pin jumper (JP4) to the on position. The

output voltage should rise to 1.5V. The output voltage

meter should read the selected output voltage ±2%.

4. Vary the input voltage from 6V to 24V and adjust the

load current from 0A to 6A. The output voltage meter

should read the selected output voltage ±2%. Set the

input voltage to 12V and the load current to 6A.

5. Measure the output voltage ripple at J5 with a BNC

cable and oscilloscope.

6. To set the output voltage to 5V, turn off the input supply

power, apply the following changes listed below and

repeat steps 2 to 5:

JP10 JP3 JP4 JP2

VOUT Select MODE RUN TRACK/SS

5V CCM OFF SS

7. Set the load current to 0A. Set the RUN pin jumper

(JP4) to the OFF position. Power off the input supply.

8. For loadtransient tests,apply an adjustablepositive pulse

signal between IOSTEP CLK and GND test points. The

pulse amplitude sets the load step current amplitude.

The pulse width should be short (<1ms) and pulse duty

cycle should be low (<15%) to limit the thermal stress

on the load transient circuit. The load step current can

be monitored with a BNC connected to J6 (10mV/A).

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dc1472af

DEMO MANUAL DC1472A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

–

–+

+–

VIN

LOAD

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dc1472af

DEMO MANUAL DC1472A

Figure 2. Measured Supply Efﬁciency at 12VIN and 24VIN

Efﬁciency vs Load Current, 12VIN

Efﬁciency vs Load Current, 24VIN

QUICK START PROCEDURE

LOAD CURRENT (A)

EFFICIENCY (%)

DC1472 F02a

70 246

5VOUT

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

fSW = 500kHz

CCM Mode

LOAD CURRENT (A)

EFFICIENCY (%)

DC1472 F02b

70 246

5VOUT

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

fSW = 500kHz

CCM Mode

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dc1472af

DEMO MANUAL DC1472A

VIN (V) VOUT (V) COUT BULK COUT CERAMIC

12 1.5 330μF/6.3V POSCAP 1 ×47μF 10V

VIN (V) VOUT (V) IOUT (A) AIRFLOW AMBIENT (°C)

12 1.5 6 Natural Convection 27

Figure 3. Measured Load Transient Response (0A to 6A Load Step)

Figure 4. Measured Thermal Capture

QUICK START PROCEDURE

VOUT

100mV/DIV

IOUTSTEP

5A/DIV

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dc1472af

DEMO MANUAL DC1472A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C5 CAP, 150μF 35V, ALUM SANYO, 35ME150WXV+TS

2 2 C6, C7 CAP, X5R, 10μF 35V, 1210 TAIYO YUDEN, GMK325BJ106MN-T

3 1 C12 CAP, X5R, 47μF 10V, 1210 TDK, C3225X5R1A476M

4 1 C14 CAP, POSCAP, 330μF 6.3V, 7343 SANYO, 6TPC330MA

5 1 C15 CAP, X5R, 1μF 10V, 0805 AVX, 0805ZD105MAT2A

6 1 C20 CAP, X7R, 0.1μF 16V, 0603 AVX, 0603YC104KAT2A

7 1 R1 RES., 121k 1/16W 1%, 0603 VISHAY, CRCW0603121KFKEA

8 4 R3, R11 RES., 10k 1/16W 1%, 0603 VISHAY, CRCW060310K0FKEA

9 1 R4 RES., 3.16k 1/16W 1%, 0603 VISHAY, CRCW06033K16FKEA

10 1 R5 RES., 60.4k 1/16W 1%, 0603 VISHAY, CRCW060360K4FKEA

11 1 R14 RES., 69.8k 1/16W 1%, 0603 VISHAY, CRCW060369K8FKEA

12 1 R16 RES., 48.7k 1/16W 1%, 0603 VISHAY, CRCW060348K7FKEA

13 1 R17 RES., 28.7k 1/16W 1%, 0603 VISHAY, CRCW060328K7FKEA

14 1 R18 RES., 19.1k 1/16W 1%, 0603 VISHAY, CRCW060319K1FKEA

15 1 R19 RES., 11.5k 1/16W 1%, 0603 VISHAY, CRCW060311K5FKEA

16 1 U1 IC, LTM4618EV LINEAR TECH., LTM4618EV LGA

Additional Demo Board Circuit Components

1 0 C1-C4, C16, C19, C21-C24 CAP, 0603 Optional

2 0 C8, C9, C10, C11, C13 CAP, 1210 Optional

3 2 C17, C18 CAP, X5R, 1μF 10V, 0603 TAIYO YUDEN, LMK107BJ105MA-T

4 0 R6, R8, R10, R12 RES, 0603 Optional

5 4 R7 RES., 10k 1/16W 1%, 0603 VISHAY, CRCW060310K0FKEA

6 1 R9 RES., 0.01Ω 5% 1W, 2512 IRC, LRC-LRF2512LF-01-R010-J

7 1 R15 RES., 10k 1/16W 1%, 0603 VISHAY, CRCW060310K0FKEA

8 1 R2 RES., 100k 1/16W 1%, 0603 VISHAY, CRCW0603100KFKEA

9 1 R13 RES., CHIP, 0, 1/16W, 0603 VISHAY, CRCW06030000Z0EA

10 1 D1 DIODE, ZENER 350MW 4.7V, SOT-23 DIODES INC., BZX84C4V7-7-F

11 1 Q1 XSTR, SUD50N03-10CP MOSFET SILICONIX, SUD50N03-10CP

Hardware

1 10 E1-E10 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP4 JMP, 1X3, 0.079" SAMTEC, TMM-103-02-L-S

3 1 JP3 JMP, 1X4, 0.079" SAMTEC, TMM-104-02-L-S

4 6 JP5, JP6, JP7, JP8, JP9, JP10 JMP, 1X2, 0.079" SAMTEC, TMM-102-02-L-S

5 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4

6 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404

7 5 JP1-JP4, JP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

8 4 4 Corners STANDOFF, SNAP ON, 0.50" KEYSTONE, 8833

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dc1472af

DEMO MANUAL DC1472A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However,no responsibility is assumed for its use. LinearTechnology Corporation makes no representation

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

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS AS SHOWN.

FSW = 500KHz

VOUT

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

Monday, March 15, 2010

HIGH DENSITY 6A STEP-DOWN POWER uMODULE

SAM Y.

N/A

LTM4618EV

DEMO CIRCUIT 1472A

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, March 15, 2010

HIGH DENSITY 6A STEP-DOWN POWER uMODULE

SAM Y.

N/A

LTM4618EV

DEMO CIRCUIT 1472A

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, March 15, 2010

HIGH DENSITY 6A STEP-DOWN POWER uMODULE

SAM Y.

N/A

LTM4618EV

DEMO CIRCUIT 1472A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.PRODUCTION2 03-15-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.PRODUCTION2 03-15-10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.PRODUCTION2 03-15-10

IOSTEP

R19

11.5k

R19

11.5k

10uF

35V

1210

10uF

35V

1210

JP8

2.5V

JP8

2.5V

EXTVCC

R18

19.1k

R18

19.1k

C16

OPT

C16

OPT

10k

C13

OPT

1210

C13

OPT

1210

JP7

1.8V

JP7

1.8V

C17

1uF

10V

C17

1uF

10V

TP1TP1 C19

OPT

C19

OPT

R17

28.7k

R17

28.7k

R11

10k

R11

10k

OPT

C20

0.1uF

C20

0.1uF

TRACK

0.01

2512

0.01

2512

JP5

1.2V

JP5

1.2V

PGOOD

R16

48.7k

R16

48.7k

JP4

RUN

OFF

JP4

RUN

OFF

J3 VOUT

6A MAX

J3 VOUT

6A MAX

OPT

SGND

VIN

4.5V - 26.5V

VIN

4.5V - 26.5V

OPT

C12

47uF

10V

1210

C12

47uF

10V

1210

VIN

LTM4618EV

GND

F5 GND

F4 GND

F3 GND

F2 GND

GND

G7 GND

NC A1

INTVCC D3

GND

G5 GND

GND

VIN

VOUT J1

VOUT J2

VIN

VOUT J3

VOUT J4

PLLFLTR A2

TRACK/SS

VOUT K1

VOUT K2

VOUT K3

RUN

VFB D1

GND

PGOOD D2

GND

E2 GND

VOUT K4

VOUT L1

VOUT L2

GND

D7 GND

D6 GND

D5 GND

D4 GND

GND

G3 GND

G2 GND

VOUT L3

VOUT L4

VOUT M1

VOUT M2

VOUT M3

VOUT M4

GND

GND J5

GND J6

GND J7

GND K5

GND K7

GND L5

GND L6

GND L7

GND M5

GND M6

GND M7

SGND

C3 PLLIN A3

COMP

EXTVCC C4

C15

1uF

10V

0805

C15

1uF

10V

0805

JP6

1.5V

JP6

1.5V

VOUT

R14

69.8k

R14

69.8k

1210

OPT

1210

OPT

C14

330uF

6.3V

7343

C14

330uF

6.3V

7343

60.4k

100k

C11

OPT

1210

C11

OPT

1210

3.16k

JP2

TRACK/SS

TRACK

JP2

TRACK/SS

TRACK

10uF

35V

1210

10uF

35V

1210

OPT

JP1

FREQ

EXT CLK

INT CLK

JP1

FREQ

EXT CLK

INT CLK

C23

OPT

C23

OPT

C18

1uF

10V

C18

1uF

10V

GND

C10

OPT

1210

C10

OPT

1210

OPT

1210

OPT

150uF

35V

SANYO

150uF

35V

SANYO

121k

BZX84C4V7

10k

E10

CLKIN

E10

CLKIN

JP3

CCM

BURST/EXT CLK

PULSE SKIP

MODE/CLK SEL

JP3

CCM

BURST/EXT CLK

PULSE SKIP

MODE/CLK SEL

R12

OPT

R12

OPT

R15

10k

R15

10k

OPT

JP10

SUD50N03

C22

OPT

C22

OPT

R10

OPT

R10

OPT

C21

OPT

C21

OPT

GND

IOSTEP

CLK

IOSTEP

CLK

VOUT

GND

C24

OPT

C24

OPT

JP9

3.3V

JP9

3.3V

GND

R13

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dc1472af

DEMO MANUAL DC1472A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1010 • 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 direc-

tive 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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