DC1668A-B LTM4627EV High Efficiency 40A PolyPhase ......With power off, connect the input power supply, load, meters, and VOUT BNC cable as shown in Figure 1. Preset the load to 0A

1dc1668abf

DEMO MANUAL DC1668A-B

DESCRIPTION

LTM4627EV High Efficiency 40A PolyPhase Step-Down

Power Supply

BOARD PHOTO

Demonstration circuit 1668A-B is a PolyPhase® power sup-ply featuring three LTM®4627 high efficiency synchronous buck µModule® regulators. The DC1668A-B input voltage range is between 4.5V to 20V with a jumper programmable output voltage from 0.6V to 3.3V. The demo circuit can deliver up to 40A of load with excellent current sharing. Current derating may be necessary under certain operat-ing conditions.

The LTM4627 can be synchronized to an external clock be-tween 250kHz to 770kHz. The default switching frequency for the DC1668A-B is set to 500kHz through the onboard

LTC6902 clock generator. The external clock interleaves the paralleled phases to minimize input and output ripple.

DC1668A-B demonstrates that paralleling LTM4627 mod-ules is easy and reliable. These features and the availability of the LTM4627 in a compact thermally enhanced 15mm × 15mm × 4.32mm LGA package make the circuit ideal for use in high density point of load regulation applications.

Design files for this circuit board are available at http://www.linear.com/demoL, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

http://www.linear.com/demo

2dc1668abf


PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 20V

Output Voltage VOUT Remove VOUT SEL Jumper for VOUT = 0.6VDC 0.6VDC, 1VDC, 1.2VDC, 1.5VDC, 1.8VDC, 2.5VDC, 3.3VDC

Maximum Continuous Output Current IOUT(MAX) Current Derating May Be Necessary for Certain VIN, VOUT, Frequency and Thermal Conditions.

40ADC

Default Operating Frequency 500kHz

External Clock Synchronous Frequency Range 250kHz to 770kHz

Output Voltage Ripple (Typical) VIN = 12V, VOUT = 1.8V 500kHz (20MHz BW)

< 20mVP-P at IOUT = 40A, See Figure 5

Efficiency VIN = 12V, VOUT = 1.8V 500kHz

87.3% at IOUT = 40A, See Figure 2

Load Transient VIN = 12V, VOUT = 1.8V See Figure 4

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Demonstration circuit 1668A-B is easy to set up to evaluate the performance of paralleled LTM4627 modules. 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, meters, and VOUT BNC cable 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 1.8VOUT application:

JP2 JP7 JP6

VOUT Select RUN TRACK/SS

1.8V OFF SOFT-START

2. Turn on the power at the input. Increase VIN to 12V (Do not hot-plug the input supply or apply more than the rated maximum voltage of 20V to the board or the modules may be damaged).

3. Set the RUN pin jumper (JP7) to the ON position. The output voltage should be regulated. The output voltage meter should read 1.8V ±2% (1.76V to 1.84V).

4. Vary the input voltage from 5V to 20V and adjust the load current from 0A to 40A. VOUT should remain regulated at 1.8V ±2%. Observe the load regulation, output voltage ripple, efficiency and other parameters. Output voltage ripple should be measured at J6 with a BNC cable and oscilloscope. The probe channel for VOUT should be set at 50Ω termination resistance to match the BNC Cable.

5. For optional load transient testing apply an adjustable positive pulse signal between IOSTEP CLK and GND pins. 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 J5 (5mV/A).

3dc1668abf



Figure 1. Test Setup of DC1668A-B

– +

+– V

A

+

+

–

–

V

A

VIN

BNC CABLETO OSCILLOSCOPETERMINATE INTO 50Ω

LOAD

1668ab F01

4dc1668abf



Figure 2. Measured Efficiency at 12VIN, 500kHz

Figure 4. Measured Load Step Response

Figure 3. Thermal Capture at 12VIN, 1.8VOUT, 40A, 500kHz No Forced Airflow (Convection). TA = 29°C

Figure 5. Measured Output Voltage Ripple (20MHz BW)

LOAD CURRENT (A)0

EFFI

CIEN

CY (%

)

252015

1668ab F02

95

90

105 403530

85

80

75

70

3.3VOUT2.5VOUT1.8VOUT1.5VOUT1.2VOUT1VOUT

1668ab F04

20A/DIV

100mV/DIVVOUT

IOUT STEP

VOUT = 1.8VIOUT DC = 20AIOUT STEP = 20AfSW = 500kHz

1668ab F05

50mV/DIVVOUT

VOUT = 1.8VIOUT = 40AfSW = 500kHz

5dc1668abf


PARTS LISTITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

Required Circuit Components:

1 1 CIN1 Cap, 150µF 20% 35V Alum Sanyo 35MV150WXV

2 3 CIN13, CIN18, CIN20 Cap, 1210 22µF 20% 25V X5R AVX 12103D226MAT2A

3 3 COUT1, COUT5, COUT9 Cap, 1812 100µF 20% 6.3V X5R TDK C4532X5R0J107MZ

4 3 COUT20, COUT21, COUT22 Cap, 470µF 20% 4V POSCAP Sanyo POSCAP 4TPF470ML

5 2 R8 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA

6 2 R18, R19 Res, 0603 10Ω 5% 1/10W AAC CR16-100JM

7 4 R30, R31, R32, R33 Res, 0603 100Ω 5% 1/10W KOA RK73B1JTTD101J

8 1 R34 Res, 0603 100k 5% 1/10W Vishay CRCW0603100KJNEA


10 1 U5 IC, LTC6902CMS Multiphase Oscillator Linear Technology LTC6902CMS

11 1 C12 Cap, 0603 100pF 10% 50V NP0 AVX 06035A101KAT2A

12 1 C61 Cap, 0603 68pF 10% 50V NP0 AVX 06035A680KAT


14 1 R1 Res, 0603 10k 1% 1/10W Vishay CRCW060310K0FKEA

15 1 R2 Res, 0603 13.3k 1% 1/10W Vishay CRCW060313K3FKEA




19 1 R14 Res, 0603 20k 1% 1/10W Vishay CRCW060320K0FKEA

20 1 R29 Res, 0603 133k 1% 1/10W Vishay CRCW0603133KFKEA

21 3 U1, U2, U3 IC, µModule Regulator Linear Technology LTM4627EV

Additional Demo Board Circuit Components:

1 2 C14, C38 Cap, 0603 0.1µF 20% 16V X7R Taiyo Yuden EMK107BJ104MA-T

2 1 C16 Cap, 0603 1µF 20% 10V X5R Taiyo Yuden LMK107BJ105MA-T


4 1 D1 Diode, Zener 350mW Diodes Inc. MMBZ5227B

5 1 R7 Res, 0805 2k 5% 1/10W AAC CR10-202JM

6 1 Q14 XSTR, SUD50N03-10CP MOSFET Siliconix SUD50N03-10CP

7 1 R10 Res, 0603 10k 5% 1/10W AAC CR16-103JM


9 3 R11, R16, R17 Res, 2512 0.015Ω 1% 1W Panasonic ERJM1WSF15MU

10 0 CIN2, CIN3 Cap, 1206 10µF 20% 35V X5R Option Taiyo Yuden GMK316BJ106ML-T Option

11 0 CIN14, CIN19, CIN21, CIN23 Cap, 1210 22µF 20% 25V X5R Option AVX 12103D226MAT2A Option

12 0 COUT2, COUT3, COUT6 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

13 0 COUT4, COUT7, COUT11 Cap, 1812 Option Taiyo Yuden JMK432BJ107MU-T Option

14 COUT15

15 0 COUT10, COUT14 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

16 0 COUT19 Cap, 1206 Option Taiyo Yuden EMK316BJ475ML-T Option

17 0 COUT23, COUT26, COUT27 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option

18 0 COUT24 Cap, 1812 Option Taiyo Yuden JMK316BJ226ML-T

6dc1668abf


ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

19 0 C15 Cap, 0603 1µF 20% 10V X5R Option Taiyo Yuden LMK107BJ105MA-T Option

20 0 C18, C55, C56, C57, C58, C62 Cap, 0603 Option Option

21 C74 to C77

22 0 C59, C63, C66, C68 Cap, 0805 Option Option

23 0 C64 Cap, 0603 1000pF 10% 50V NP0 Option AVX 06035A102KAT2A Option

24 0 C69, C71, C72, C73 Cap, 150µF 20% 35V Alum Option Sanyo 35MV150WXV Option

25 1 C70 Cap, 0603 0.22µF 20% 10V X5R Option Taiyo Yuden LMK107BJ224MA-T Option

26 0 R9, R13, R15, R23, R24 Res, 0603 51k 5% 1/10W Option AAC CR16-513JM Option

27 0 R21, R22, R36 Res, 0603 Option Option

28 0 CIN22 Cap, 1210 22µF 20% 25V X5R Option AVX 12103D226MAT2A Option

29 0 COUT13 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

30 0 COUT25 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option

31 0 R26, R27, C54, C67 Cap, 0603 Option Option

Hardware

1 6 JP1, JP2, JP3, JP4, JP5, JP8 Header, 2 Pin, 2mm Samtec TMM 102-02-L-S

2 2 JP6, JP7 Header, 3 Pin, 2mm Samtec TMM-103-02-L-S

3 4 J1, J2, J3, J4 Stud, Press-Fit PEM KFH-032-10

4 2 J5, J6 Conn, BNC, 5 Pins Connex 112404

5 10 TP1 to TP8, TP13, TP14 Turret Mill Max 2501-2-00-80-00-00-07-0

6 3 JP1, JP6, JP7 Shunt, 2mm Samtec 2SN-BK-G

7 4 Standoff, Snap On Keystone 8834

8 8 J1, J2, J3, J4 Nut, Brass #10-32 Any

9 4 J1, J2, J3, J4 Washer, Brass #10 Any

10 4 J1, J2, J3, J4 Lug, Ring Keystone 310 PbF

PARTS LIST

7dc1668abf


SCHEMATIC DIAGRAMS

SO

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T 2

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SH

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PGNDD2

PGNDD3

PGNDD4

PGNDD5

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PGNDE4

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PGNDF2

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PGNDF4

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PGNDF6

PGNDF7

PGNDF8

PGNDF9

PGNDG1

PGNDG2

PGNDG3

PGNDG4

PGNDG5

PGNDG6

PGNDG7

PGNDG8

PGNDG9

PGNDH1

PGNDH2

PGNDH3

PGNDH4

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4JP

4

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T

C15

OP

T

8dc1668abf


SCHEMATIC DIAGRAMS

SH

T 1

,3

SH

T 1

,3

SH

T 1

,3S

HT

1,3

SH

T 1

,3

SH

T 3

SH

T 3

*

*

SH

T 1

,3

35M

V150W

XV

1210

1210

0805

7343

1812

1812

1812

1812

1812

7343

1812

35M

V150W

XV

1210

1210

0805

TR

AC

K/S

S

CO

MP

DIF

FV

OU

T

VF

B

VF

B

DIF

FV

OU

T

EX

TV

CC

CO

MP

EX

TV

CC

VIN

VO

UT

VIN

VO

UT

VF

B

DIF

FV

OU

T

CO

MP

CLK

2

TR

AC

K/S

S

RU

N

CLK

3

EX

TV

CC

TE

CH

NO

LO

GY

W

ed

ne

sd

ay,

Octo

be

r 2

0,

20

10

HIG

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9dc1668abf


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 DIAGRAMS

SH

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OP

T

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R33

100

R33

100

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0.1

uF

C38

0.1

uF

CIN

23

OP

T

CIN

23

OP

T

10dc1668abf


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

LT 1110 • 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

DESCRIPTIONBOARD PHOTOPERFORMANCE SUMMARYQUICK START PROCEDUREPARTS LISTSCHEMATIC DIAGRAMS

Documents

DC1668A-B LTM4627EV High Efficiency 40A PolyPhase ......With power off, connect the input power supply, load, meters, and VOUT BNC cable as shown in Figure 1. Preset the load to 0A