Linear Technology DC1385A Quick setup guide

dc1385af

DEMO MANUAL DC1385A

DESCRIPTION

LTM4614EV: Dual 4A

Step-Down µModule

Regulator

Demonstration circuit DC1385A features the LTM

4614EV,

thehighefficiency, high density power module with dual 4A

switchmode outputs. Derating is necessaryfor certain VIN,

VOUT, and thermal conditions. In the default configuration,

thetwo outputs share the same input supply, howevereach

regulator may have its own input supply simply by remov-

ing a resistor. By enabling the tracking feature, the outputs L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks of

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

PERFORMANCE SUMMARY

BOARD PHOTO

coincidentally follow anothersupplyrail.The LTM4614 data

sheet must be read in conjunction with this demo board

prior to working on or modifying demo circuit DC1477A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range VIN1 and VIN2 2.375V to 5.5V

Output Voltage VOUT1, VOUT2 VIN = 5VDC,

IOUT1, IOUT2 = 4A.

VOUT1 = 1.8V ±2%,

VOUT2 = 1.2V ±2%

Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT, and Thermal

Conditions, See Data Sheet for Details

4ADC for VOUT1, VOUT2

Default Operating Frequency 1.25MHz

Efficiency of Channel 1 VIN1 = 5V, VOUT1 = 1.8V, IOUT1 = 4A 81.5%, See Figure 3

Efficiency of Channel 2 VIN2 = 5V, VOUT2 = 1.2V, IOUT2 = 4A 75.4%, See Figure 3

dc1385af

DEMO MANUAL DC1385A

QUICK START PROCEDURE

Demonstration circuit DC1385A is an easy way to evalu-

ate the performance of the LTM4614EV. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

1. Place jumpers in the following positions for a typical

1.8V and 1.2V application:

TRACK1 RUN1 RUN2

DISABLED ON ON

2. With the power off, connect the input power supply,

load and meters as shown in Figure 1. Preset the loads

to 0A and VIN supply to be less than 5.5V.

3. Turn on the power at the input. The output voltage

between VO1+and VO1–should be 1.8V ± 2%, and the

voltage between VO2+and VO2–should be 1.2V ±2%.

4. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters. To measure input and output ripple,

please refer to Figure 2 for proper setup.

5. Channel 1 can track another supply by connecting TP17,

TRACK to another supply and setting JP1 to ENABLED.

Resistors R8 and R9 are set up for coincidental tracking.

Channel 2 is set up to coincidentally track the output

of channel 1 by resistor R6 and R7. Please refer to the

circuit schematic and data sheet.

6. Because DC1385A is assembled in a way that VOUT2

tracks VOUT1 automatically, placing the JP2 (RUN1) to

OFF position turns off both outputs. To disable track-

ing function of VOUT2, please remove R6 and R7 and

connect TRACK2 to VIN2.

7. VIN1 and VIN2 are shorted on DC1385A through a

1mohm resistor, R10. If desired, remove R10 and dif-

ferent supplies can be applied to VIN1 and VIN2 of this

demo circuit.

dc1385af

DEMO MANUAL DC1385A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1385A

Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple

+–

LOAD

–+

+–

LOAD

–+

0 ~ 4A

–+

+–

VIN

0 ~ 4A

–+

+–

INPUT OR OUTPUT CAPACITOR

dc1385af

DEMO MANUAL DC1385A

Figure 3. Measured Efficiency for Different Channels

QUICK START PROCEDURE

dc1385af

DEMO MANUAL DC1385A

Figure 4. Measured Load Transient Response for VOUT1

Figure 5. Measured Load Transient Response for VOUT2

QUICK START PROCEDURE

VOUT1 (20mV/DIV)

IOUT1 STEP (2A/DIV)

VIN1 = 5V

VOUT1 =1.8V

CONTINUOUS CURRENT MODE (CCM)

1A TO 4A LOAD STEP ON VOUT1

COUT1 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)

VOUT2 (20mV/DIV)

IOUT2 STEP (2A/DIV)

VIN2 = 5V

VOUT2 =1.2V

CONTINUOUS CURRENT MODE (CCM)

1A TO 4A LOAD STEP ON VOUT2

COUT2 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)

dc1385af

DEMO MANUAL DC1385A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN7 CAP., OSCON 120uF, 10V, E7 SANYO, 10SVP120M

2 4 CIN3, CIN4, CIN5, CIN6 CAP., X5R, 10μF, 6.3V, 20%, 1206 AVX, 12066D106MAT2A

3 2 CO3, CO8 CAP., X5R, 22μF, 6.3V, 20%, 1206 AVX, 12066D226MAT2A

4 2 CO1, CO9 CAP., X5R, 100μF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

5 1 RSET1 RES., CHIP, 4.02k, 1/16W, 1%, 0402 VISHAY, CRCW04024K02FKED

6 1 RSET2 RES., CHIP, 10.0k, 1/16W, 1%, 0402 VISHAY, CRCW040210K0FKED

7 2 R2, R1 RES., CHIP, 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED

8 1 U1 I.C. LTM4614EV 144 PIN LGA LINEAR TECH., LTM4614EV

Additional Demo Board Circuit Components

1 0 CPP1, CFF1, CPP2, CFF2 CAP., 0402, OPT

2 0 CIN2, CIN8, CO11, CO12 CAP., 1206, OPT

3 0 CO2, CO4, CO5, CO6, CO7, CO10 CAP., 7343, OPT CAP7343

4 0 C1, C2, C3, C4 CAP., 0402, OPT

5 1 R9 RES., CHIP, 4.02k, 1/16W, 1%, 0402 VISHAY, CRCW04024K02FKED

6 1 R7 RES., CHIP, 10.0k, 1/16W, 1%, 0402 VISHAY, CRCW040210K0FKED

7 2 R8, R6 RES., CHIP, 4.99k, 1/16W, 1%, 0402 VISHAY, CRCW04024K99FKED

8 1 R10 RES., CHIP, 1mΩ, 1W, 5%, 2512 PANASONIC, ERJM1WTJ1M0V

Hardware-For Demo Board Only

1 3 JP1, JP2, JP3 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

2 3 JPX1, JPX2, JPX3 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

3 13 TP1, TP3, TP7-9, TP12, TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

TP14, TP16-20, TP23

4 8 TP2, TP6, TP10, TP11, TP13, JACK BANANA KEYSTONE, 575-4

TP15, TP21, TP22

5 4 (STAND-OFF) STAND-OFF, NYLON 0.50" KEYSTONE, 8833(SNAP ON)

dc1385af

DEMO MANUAL DC1385A

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

VIN1+

VIN1-

VIN1

GND

2.375V - 5.5V

PGOOD1

TRACK1

DISABLED

ENABLED

OFF

TRACK

GND2

GND1

VOUT1

GND1

VO1+

VO1-

1.8V @ 4A MAX

PGOOD2

RUN2

OFF

1.2V @ 4A MAX

GND2

VO2-

VO2+

VOUT2

RUN1

2.375V - 5.5V

VIN2-

VIN2

VIN2+

GND

DC1385A

Thursday, June 05, 2008

Antonina 3/7/07

J. Sun 3/7/07

High Density Dual Step-Down Power Module

LTM4614EV

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

TECHNOLOGY

1630 McCarthy Blvd.

Milpi tas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETSCUSTOMER-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.

CUSTOMER NOTICE

VIN1

SW1 SW2

VOUT1

VIN2

VIN1

VOUT2

VOUT1 VOUT2

VIN1

VOUT1

VOUT2

VIN2

TP11

CIN7

120uF

10V

10.0K

CO10

OPT

CFF2

OPT

RSET1

4.02K

TP18

CIN8

OPT

CIN3

10uF

6.3V

TP22

CIN2

OPT

TP12

CO1

100uF

6.3V

JP2

4.99K

TP19

TP5

LTM4614EV

G10

G11

G12

H10

H11

H12

J10

J11

J12

K10

K11

K12

L10

L11

L12

A10

A11

A12

B10

B11

B12

C10

C11

C12

D10

D11

D12

E10

E11

E12

M10

M11

M12

F10

F11

F12

GND1

RUN/SS1

GND1

SW1

GND1

COMP1

PGOOD1

VIN1

GND1

VIN1

GND1

VOUT1

VIN1

SW1

FB1

VOUT1

VIN1

TRACK1

VOUT1

GND2

COMP2

GND2

VIN2

GND2

VIN2

GND2

VOUT2

VIN2

RUN/SS2

SW2

FB2

VIN2

PGOOD2

TRACK2

GND2

GND1

VOUT1

VOUT2

SW1

SW2

CO3

22uF

6.3V

CPP1

OPT

TP7

CIN4

10uF

6.3V

TP21

TP1

4.02K

OPT

CO7

OPT

TP2

CO9

100uF

6.3V

R10

1mOhm

CIN6

10uF

6.3V

RSET2

10K

TP13

OPT

TP20

CO2

OPT

CFF1

OPT

TP9

TP6

TP16

OPT

TP15

TP14

TP17

CO5

OPT

CO4

OPT

CIN5

10uF

6.3V

TP10

TP4

4.99K

OPT

CO12

OPT

CO8

22uF

6.3V

TP3

100K

CPP2

OPT

JP1

CO6

OPT

CIN1

120uF

10V

100K

TP23

TP8

JP3

CO11

OPT

dc1385af

DEMO MANUAL DC1385A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0211 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1385A

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