DC1472A-LTM4618EV Evaluation Kit Quick Start Guide

1dc1472af

DEMO MANUAL DC1472A

DESCRIPTION

LTM4618EV: 6A Step-Down Power

µModule Regulator

Demonstration circuit 1472 features the LTM®4618EV μModule® regulator, a complete high effi ciency 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 may be 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

from pulse-skipping or Burst Mode® operation for improved effi ciency 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 fi les for this circuit board are available at http://www.linear.com/demo

2dc1472af

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

Effi ciency 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 load transient tests, apply an adjustable positive 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).

3dc1472af

DEMO MANUAL DC1472A


Figure 1. Proper Measurement Equipment Setup

+

A

V

–

+

V

+

–

A–+

+ –

VIN

LOAD

4dc1472af

DEMO MANUAL DC1472A

Figure 2. Measured Supply Effi ciency at 12VIN and 24VIN

Effi ciency vs Load Current, 12VIN

Effi ciency vs Load Current, 24VIN


LOAD CURRENT (A)0

EFFI

CIEN

CY (%

)80

85

DC1472 F02a

75

702 4 6

95

90

5VOUT3.3VOUT2.5VOUT1.8VOUT1.5VOUT1.2VOUT

fSW = 500kHzCCM Mode

LOAD CURRENT (A)0

EFFI

CIEN

CY (%

)

80

85

DC1472 F02b

75

702 4 6

95

90

5VOUT3.3VOUT2.5VOUT1.8VOUT1.5VOUT

fSW = 500kHzCCM Mode

5dc1472af

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


VOUT100mV/DIV

IOUTSTEP5A/DIV

6dc1472af

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







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

7dc1472af

DEMO MANUAL DC1472A

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAM

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J6

IOST

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J6

IOST

EP

R19

11.5

kR

1911

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C6

10uF

35V

1210

C6

10uF

35V

1210

JP8

2.5V

JP8

2.5V

E2EX

TVC

CE2

EXTV

CC

R18

19.1

kR

1819

.1k

C16

OPTC16

OPT

R3

10k

R3

10k

C13

OPT

1210

C13

OPT

1210

JP7

1.8V

JP7

1.8V

C17

1uF

10V

C17

1uF

10V

TP1

TP1

C19

OPT

C19

OPT

R17

28.7

kR

1728

.7k

R11

10k

R11

10k

C3

OPTC3

OPT

C20

0.1u

FC

200.

1uF

E7TR

AC

KE7

TRA

CK

R9

0.01

2512

R9

0.01

2512

JP5

1.2V

JP5

1.2V

E1PG

OO

DE1

PGO

OD

R16

48.7

kR

1648

.7k

JP4

RU

N

OFFON

JP4

RU

N

OFFON

1 32

J3VO

UT

6A M

AX

J3VO

UT

6A M

AX

C4

OPTC4

OPT

E9SG

ND

E9SG

ND

J1VI

N4.

5V -

26.5

V

J1VI

N4.

5V -

26.5

V

C1

OPT

C1

OPT

C12

47uF

10V

1210

C12

47uF

10V

1210

E3VI

NE3

VIN

U1LT

M46

18EV

U1LT

M46

18EV

GN

DA

4

GNDF6

GNDF7

GNDF5GNDF4GNDF3GNDF2GNDF1

GNDG7GNDG6

NC

A1

INTVCCD3

GNDG5GNDG4

GN

DE4

VIN

A5

SWK

6

VIN

A6

VIN

A7

VOU

TJ1

VOU

TJ2

VIN

B5

VIN

B6

VIN

B7

VIN

C5

VIN

C6

VIN

C7

VOU

TJ3

VOU

TJ4

PLLFLTRA2

TRA

CK

/SS

B1

VOU

TK

1

VOU

TK

2

VOU

TK

3

RU

NB

2

VFB

D1

GN

DE3

PGOODD2

GN

DE2

GN

DE1

VOU

TK

4

VOU

TL1

VOU

TL2

GN

DD

7G

ND

D6

GN

DD

5G

ND

D4

GN

DB

4

GNDG3GNDG2GNDG1

VOU

TL3

VOU

TL4

VOU

TM

1

VOU

TM

2

VOU

TM

3

VOU

TM

4

GN

DE5

GN

DE6

GN

DE7

GNDH1

GNDH2

GNDH3

GNDH4

GNDH5

GNDH6

GNDH7G

ND

J5

GN

DJ6

GN

DJ7

GN

DK

5

GN

DK

7

GN

DL5

GN

DL6

GN

DL7

GN

DM

5

GN

DM

6

GN

DM

7

SGN

DB

3

SGN

DC

2

SGN

DC

3PL

LIN

A3

CO

MP

C1

EXTVCCC4

C15

1uF

10V

0805

C15

1uF

10V

0805

JP6

1.5V

JP6

1.5V

E4VO

UT

E4VO

UT

R14

69.8

kR

1469

.8k

C9

1210

OPT

C9

1210

OPT

+C

1433

0uF

6.3V

7343

+C

1433

0uF

6.3V

7343

R5

60.4

kR

560

.4k

R2

100k

R2

100k

C11

OPT

1210

C11

OPT

1210

R4

3.16

kR

43.

16k

JP2

TRA

CK

/SS

TRA

CK

SS

JP2

TRA

CK

/SS

TRA

CK

SS13 2

C7

10uF

35V

1210

C7

10uF

35V

1210

R6

OPT

R6

OPT

JP1

FREQ

EXT

CLK

INT

CLK

JP1

FREQ

EXT

CLK

INT

CLK

13 2C

23O

PTC

23O

PT

C18

1uF

10V

C18

1uF

10V

E6G

ND

E6G

ND

C10

OPT

1210

C10

OPT

1210

C8

1210

OPT

C8

1210

OPT

C2

OPTC2

OPT

+C

515

0uF

35V

SAN

YO

+C

515

0uF

35V

SAN

YO

R1

121k

R1

121k

D1

BZX

84C

4V7

D1

BZX

84C

4V7

3 1

R7

10k

R7

10k

E10 C

LKIN

E10 C

LKIN

JP3

CC

MB

UR

ST/E

XT C

LKPU

LSE

SKIP

MO

DE/

CLK

SEL

JP3

CC

MB

UR

ST/E

XT C

LKPU

LSE

SKIP

MO

DE/

CLK

SEL

1 32 4

R12

OPT

R12

OPT

R15

10k

R15

10k

R8

OPT

R8

OPT

JP10

5VJP10

5V

Q1

SUD

50N

03Q

1SU

D50

N03

3

1

2

C22

OPT

C22

OPT

R10

OPTR10

OPT

C21

OPT

C21

OPT

E5G

ND

E5G

ND

E8IO

STEP

CLK

E8IO

STEP

CLK

J5

VOU

T

J5

VOU

T

J4

GN

D

J4

GN

D

C24

OPT

C24

OPT

JP9

3.3V

JP9

3.3V

J2

GN

D

J2

GN

D

R13 0R13 0

8dc1472af

DEMO MANUAL DC1472A

Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2010

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

Copyright © 2004, Linear Technology Corporation

DC1472A-LTM4618EV Evaluation Kit Quick Start Guide

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