Linear Technology DC2367A Quick setup guide

dc2367af

DEMO MANUAL DC2367A

DESCRIPTION

LTM4632EV

Ultrathin µModule Regulator for DDR-QDR4

Memory VDDQ, VTT and VREF

Demonstration circuit DC2367A features the LT M

4632EV

µModule

regulator, a tiny low-profile high-performance

high efficiency dual step-down regulator for DDR power.

LTM4632 has an operating input voltage range of 3.6V

to 15V. The output voltage of channel 1 (VDDQ) is resis-

tor programmable from 0.6V to 2.5V and is capable of

delivering up to 3A of output current. The output voltage

of channel 2 (VTT) is set to regulate ½of the voltage on

the VDDQIN pin which can provided by either the channel

1 output or an external reference voltage. It can source or

sink up to 3A of output current. A 10mA buffered output

of VDDQIN/2 is also provided for supplying VREF voltage

for DDR memory. DC2367A also provides the option for

paralleling channels 1 and 2 together for up to 6A capable

VTT rail. LTM4632 is a complete DC/DC DDR dual point L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered

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

respective owners.

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. External clock synchronization is avail-

able through the SYNC/MODE pin. For high efficiency at

low load currents the MODE pin jumper (JP4) selects the

Burst Mode

option for operation in less noise sensitive

applications. The LTM4632 data sheet must be read in

conjunction with this demo manual for working on or

modifying demo circuit 2367A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2367A

BOARD PHOTO

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dc2367af

DEMO MANUAL DC2367A

QUICK START PROCEDURE

Demonstration circuit DC2367A is an easy way to evaluate

the performance of the LTM4632. Please refer to Figure 1

for test setup connections and follow the procedure below.

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

positions for a typical application for 2.5VOUT1 and

1.25VOUT2 rails:

JP1 JP2 JP3 JP4 JP6

RUN1 RUN2 TRACK/SS MODE VDDQ SEL

ON ON SS CCM 2.5V

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

the input voltage supply to be between 3.6V to 15V.

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 ±1.5%.

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

just the load current on each rail within the 0A to 3A

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 (JP4) in the BURST MODE position.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 3.6 15 V

Output Voltage VOUT1 (VDDQ) Resistor Programmable, Jumper Selectable 1.5 (±1.5%)

1.8 (±1.5%)

2.5 (±1.5%)

Maximum Continuous Output Current IOUT1 Derating Is Necessary for Certain Operating

Conditions. See Data Sheet for Details

3 A

Output Voltage VOUT2 (VTT) VOUT1 = 1.5V

VOUT1 = 1.8V

VOUT1 = 2.5V

0.75

0.9

1.25

Maximum Continuous Output Current IOUT2 Derating Is Necessary for Certain Operating

Conditions. See Data Sheet for Details

±3 A

Default Operating Frequency 1 MHz

Efficiency VIN = 12V, VOUT1 = 2.5V, IOUT = 3A, fSW = 1MHz

VIN = 12V, VOUT2 = 1.25V, IOUT = 3A, fSW = 1MHz

83.9

(See Figure 2)

72.3

(See Figure 3)

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dc2367af

DEMO MANUAL DC2367A

VIN

VARIALE RESISTOR

(OPTIONAL) FOR

SINK CURRENT TEST

–

LOAD

0A TO 3A

–

+–

–

LOAD

0A TO 3A

–

+–

QUICK START PROCEDURE

Figure 1. Test Setup

Figure 2. VDDQ 12VIN Efficiency Figure 3. VTT 12VIN Efficiency

OUTPUT CURRENT (A)

EFFICIENCY (%)

60 2.01.0

dc2367a F02

3.0

1.50.5 2.5

RUN2 = OFF

VDDQ = 2.5V

VDDQ = 1.8V

VDDQ = 1.5V

OUTPUT CURRENT (A)

EFFICIENCY (%)

2.01.0

dc2367a F03

3.0

1.50.5 2.5

RUN1 = OFF

VDDQIN, SUPPLIED

EXTERNALLY

VTT = 1.25V

VTT = 0.9V

VTT = 0.75V

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dc2367af

DEMO MANUAL DC2367A

QUICK START PROCEDURE

IN = 12V

OUT1 = 2.5V

COUT1

= 100µF ×2, 10µF ×1

VOUT1 = 50mV/DIV

IOUT1_STEP = 2A/DIV

dc2367a F04

IN = 12V

OUT2 = 1.25V

COUT2

= 100µF ×3, 10µF ×1

VOUT2 = 50mV/DIV

IOUT1_STEP = 2A/DIV

dc2367a F05

Figure 4. VDDQ Load Transient Response (0A to 1.5A Load Step)

Figure 5. VTT Load Transient Response (0A to 1.5A Load Step)

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dc2367af

DEMO MANUAL DC2367A

QUICK START PROCEDURE

IN = 12V

OUT1 = 2.5V

OUT1 = 3A

OUT2 = 1.25V

OUT2 = 3A

SW = 1MHz

= 25°C, NO FORCED AIRFLOW

dc2367a F06

Figure 6. 12VIN Full Load Thermal Capture

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dc2367af

DEMO MANUAL DC2367A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN2 CAP., 4.7µF, X5R, 16V, 10%, 0603 TDK - C1608X5R1C475K080AC

2 2 COUT7, COUT9 CAP., 10µF, X5R, 6.3V, 10%, 0805 MURATA, GRM219R60J106KE19D

3 5 COUT1, COUT2, COUT3, COUT4, COUT6 CAP., 100µF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J107ME39L

4 1 R4 RES., 19.1k, 1/10W, 1%, 0603 VISHAY, CRCW060319K1FKEA

5 1 U1 I.C., LTM4632EV, LGA 25-6.25X6.25 LINEAR TECH., LTM4632EV#PBF

Additional Demo Board Circuit Components

1 0 CIN4, COUT5, COUT8 CAP., OPTION, 1206 OPT

2 1 CIN5 CAP., 47µF, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB

3 1 CIN3 CAP., 2.2µF, X7R, 25V, 10%, 0805 TAIYO YUDEN, TMK212B7225KGHT

4 1 CIN6 CAP., POSCAP, 22µF, X5R, 25V, 20%, 7343 PANASONIC, 25TQC22MV

5 4 CVCC1, C4, C18, CVCC CAP., 1µF, X5R, 10V, 10%, 0603 MURATA, GRM188R61A105KA61D

6 0 CDDQIN CAP., OPTION, 0805 OPT

7 1 CTR1 CAP., 4700pF, X7R, 50V, 10%, 0603 KEMET, C0603C472K5RACTU

8 1 CTTR CAP., 0.01µF, X7R, 50V, 10%, 0603 KEMET, C0603C103K5RACTU

9 1 CFFW1 CAP., 10pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H100JA01D

10 0 CC1, CC2, CTTR1 CAP., OPTION, 0603 OPT

11 0 RFB1, RTR2, R7, R26, RD1, RDDQIN RES, OPTION, 0603 OPT

12 1 R5 RES., 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA

13 1 R6 RES., 40.2k, 1/10W, 1%, 0603 VISHAY, CRCW060340K2FKEA

14 1 R3 RES., 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA

15 2 RPG1, RPG2 RES., 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

16 1 R8 RES., 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA

17 2 R1, R2 RES., 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA

18 2 RTR1, RVDDQ RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

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

20 0 R29 RES, OPTION, 2512 OPT

21 1 Q1 XSTR., MOSFET, N-CH, 40V, 14A, TO-252 VISHAY, SUD50N04-8M8P-4GE3

Hardware: For Demo Board Only

1 14 E1-E14 TESTPOINT, TURRET, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP3 CONN., HEADER, 1X3, 2mm SULLINS, NRPN031PAEN-RC

3 1 JP4 CONN., HEADER, 2X3, 2mm SULLINS, NRPN032PAEN-RC

4 1 JP6 CONN., HEADER, 2X4, 2mm SULLINS, NRPN042PAEN-RC

5 5 XJP1, XJP2, XJP3, XJP4, XJP6 SHUNT, 2mm SAMTEC 2SN-BK-G

6 2 J1, J2 CONN, BNC, 5PINS CONNEX, 112404

7 4 STAND OFF STAND OFF, NYLON, SNAP-ON, 0.375" KEYSTONE_8832

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dc2367af

DEMO MANUAL DC2367A

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

D D

C C

B B

A A

[1]

3.6V - 15V

10mA

+/- 3A

(FORCED CONTINUOUS MODE)

2.5V 1.8V 1.5V USER SEL

VDDQ SEL

0603

15V DUAL 3A DDR µMODULE REGULATOR

IOSTEP

VDDQ

[1] CIN6, 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.

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603

OPTIONAL JUMPERS FOR PARALLEL OPERATION

FOR POLY-PHASE OPERATION:

JP6 = OPEN

RD1, R29, R26, RDDQIN = 0

RVDDQ = OPT

VTT

VDDQ

VFB1

VDDQ VTT

COMP1 COMP2

VDDQ

COMP1

COMP2

VFB1

INTVCC

VIN

INTVCC INTVCC

INTVCC

VIN

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

Thursday, September 03, 2015

N/A

LTM4632EV

DEMO CIRCUIT 2367A

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

Thursday, September 03, 2015

N/A

LTM4632EV

DEMO CIRCUIT 2367A

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

Thursday, September 03, 2015

N/A

LTM4632EV

DEMO CIRCUIT 2367A

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

29/03/15

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

29/03/15

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

29/03/15

CFFW1

10pF

10uF

COUT7

6.3V

0805

RFB1

OPT

CIN5

47uF

16V

1206

E11

VDDQIN

CIN2

4.7uF

16V

0603

LTM4632EV

COMP2

GND

FB1 E4

VOUT2 B1

VOUT2 A1

COMP1

PGOOD1 D4

VOUT1 D1

PGOOD2 B4

VIN E2

VIN B3

RUN1

D2 VDDQIN A4

VOUT1 E1

GND

VIN D3

RUN2

VIN A2

MODE/SYNC

INTVCC

VTTR

TRACKSS1

PGOOD2

RPG2

100K

VIN1

R26

OPT

COUT8

6.3V

1206

CVCC

1uF

CC1

OPT

RPG1

100K

CIN6

22uF

25V

7343

JP1

OFF

RUN1

PGOOD1

CVCC1

1uF

E12

CLK

GND

JP3

TRACKSS

TRACK

VDDQ

OPT

CDDQIN

0805

TRACK1

100uF

COUT3

6.3V

1206

CTR1

4700pF

CTTR1

OPT

SUD50N04-8M8P

2 3

10K

C18

1uF

10V

GND

JP2

OFF

RUN2

OPT

COUT5

6.3V

1206

RS1

0.050

1206

CIN3

2.2uF

25V

0805

100uF

COUT2

6.3V

1206

E10

IOSTEP CLK

CTTR

10nF

R29

OPT

2512

100uF

COUT6

6.3V

1206

CC2

OPT

JP4

MODE

FCM

BURST MODE

SYNC

1 2

3 4

5 6

RTR1

RTR2

OPT

RVDDQ

E13

VTTR

100uF

COUT1

6.3V

1206

E14

GND

1uF

10V

30.1k

CIN1

4.7uF

16V

0603

OPT

19.1k

RDDQIN

OPT

RD1

OPT

GND

40.2k

100uF

COUT4

6.3V

1206

VTT

JP6

1 2

3 4

5 6

7 8

CIN4

47uF OPT

16V

1206

10uF

COUT9

6.3V

0805

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dc2367af

DEMO MANUAL DC2367A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0116 • 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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