Linear Technology DC1367A Quick setup guide

dc1367af

DEMO MANUAL DC1367A

DESCRIPTION

LTM4615EV:

Dual DC/DC Step-Down

µModule Regulator with LDO

Demonstration circuit 1367A features the LTM

4615EV, a

triple output μModule

regulator consisting of two switch

mode outputs and one LDO output. Each LTM4615 DC/DC

converter has aseparate input andenable pin. TheLTM4615

maximum load current is 4A for each switch mode channel

and 1.5A for the VLDO™ channel. However the DC1367A

is configured with the LDO input supply connected to

the VOUT2 whose maximum output current decreases

accordingly. Derating is necessary for certain VIN, VOUT

L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks

and VLDO is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

BOARD PHOTO

PERFORMANCE SUMMARY

(TA= 25°C)

and thermal conditions. The LTM4615 data sheet must be

read in conjunction with this manual prior to working on

or modifying DC1367A.

Design files for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITION VALUE

Input Voltage Range Both Switch Mode Outputs (VIN1 and VIN2) 2.5V to 5.5V

Output Voltage VOUT1 DC Voltage, VIN1 = 3.3V, IOUT1 = 4A 1.8V ±2%

Output Voltage VOUT2 DC Voltage, VIN2 = 3.3V, IOUT2 = 2.5A 1.2V ±2%

Output Voltage VO3(LDO) DC Voltage, VIN2 = 3.3V, IOUT3 = 1.5A 1.0V ±2%

Maximum Continuous Output Current Note: IOUT2 = 4.0A – I03 4A DC at VOUT1, 4A DC at VOUT2, 1.5A DC at VO3

Default Operating Frequency For 2 Switching Mode Channels 1.25MHz

Efficiency of Channel 1 VIN1 = 5.5V, VOUT1 = 1.8V, IOUT1 = 4A 82.8%, See Figure 3

Efficiency of Channel 2 VIN2 = 5.5V, VOUT2 = 1.2V, IOUT2 = 2.5A 81.7%, See Figure 3

dc1367af

DEMO MANUAL DC1367A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1367A

Figure 2. Proper Scope Probe Placement for Measuring

Input or Output Ripple

Demonstration circuit 1367A is an easy way to evaluate

the performance of the LTM4615. 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, 1.2V and 1.0V application:

TRACK1 RUN1 RUN2

DISABLED ON ON

2. With power off, preset the loads to 0A and VIN supply

to be 5V. Connect the input power supply, load and

meters as shown in Figure 1.

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

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

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

and the voltage between VO3(LDO) and GND should be

1.0V ±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. VOUT1 can track another supply by connecting TP14,

TRACK to the supply rail and setting JP1 to ENABLED.

When R8 equalsRSET1, VOUT1 is setup for coincidental

tracking. VOUT2 is set up to coincidentally track VOUT1

as determined by resistors R6 and R7. Please refer to

the circuit schematic and data sheet.

6. VOUT2 is used as the input supply for the 1.5A LDO.

Therefore, if the jumper of JP3 (RUN2) is placed at OFF

position, both channel 2 and 3 will be turned off.

7. Because DC1367A is designed so VOUT2 tracks VOUT1

automatically, placing the JP2 (RUN1) to OFF position

turnsoff allthree outputs.To disabletracking onVOUT2,

please remove R6 and R7 and connect TRACK2 to VIN2.

8. VIN1 and VIN2 are shorted on DC1367A through a 1mΩ

resistor, R10. If desired, remove R10 to allow separate

VIN1 and VIN2 power supplies.

–+

LOAD

0A TO

–

–+

LOAD

0A TO

2.5A

–

LOAD

0A TO

1.5A

V+

–

VIN

DC1376 F01

V+

–

+–

–

+–

INPUT OR OUTPUT CAPACITOR DC1376 F02

dc1367af

DEMO MANUAL DC1367A

QUICK START PROCEDURE

Figure 3. Measured Efficiency for Different Channels

Figure 4. Measured Load Transient Response for VOUT1

Figure 5. Measured Load Transient Response for VOUT2

VOUT1

50mV/DIV

IOUT1

2A/DIV

20μs/DIVVIN1 = 5.5V

VOUT1 = 1.8V

VOUT2 = 1.2V AT NO LOAD

VO3(LDO) = 1.0V AT NO LOAD

CONTINUOUS CURRENT MODE (CCM)

0A TO 3.4A LOAD STEP ON VOUT1

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

DC1367 F04

VOUT2

20mV/DIV

IOUT2

1A/DIV

20μs/DIVVIN2 = 5.5V

VOUT2 = 1.2V

VOUT1 = 1.8V AT NO LOAD

VO3(LDO) = 1.0V AT NO LOAD

CONTINUOUS CURRENT MODE (CCM)

0A TO 2.2A LOAD STEP ON VOUT2

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

DC1367 F05

LOAD CURRENT (A)

EFFICIENCY (%)

1.5 2.5 4.0

DC1376 F03

20 0.5 1.0 2.0 3.5

3.0

VIN1 = 5.5V, VOUT 1 = 1.8V

CHANNEL 2 AND 3 OFF

VIN2 = 5.5V, VOUT 2 = 1.2V

CHANNEL 1 AND 3 OFF

VIN3 = 1.2V, VOUT 3 = 1.0V

CHANNEL 1 AND 2 OFF

dc1367af

DEMO MANUAL DC1367A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN6, CIN10 CAP., OS-CON, 47μF, 10V, C6 SIZE SANYO, 10SVP47M

2 2 CO4, CO9 CAP., X5R, 100μF, 6.3V, 10%,1210-7343 AVX, 12106D107KAT2A

3 2 CO3, CO8 CAP., X5R, 22μF, 6.3V, 20%, 1206-0805 AVX, 12066D226MAT2A

4 5 C1, CIN3, CIN4, CIN8, CIN9 CAP., X5R, 10μF, 6.3V, 20%, 1206-0805 AVX, 12066D106MAT2A

5 1 CIN5 CAP., X5R, 10μF, 6.3V, 20%, 0805-0603 AVX, 08056D106MAT2A

6 1 L1 IND, 0.2μH Fair-Rite, 2508056017Y2

7 1 RSET1 RES., CHIP, 4.02k, 1/16W, 1%, 0603 VISHAY, CRCW06034K02FKEA

8 2 RSET2, R7 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA

9 1 RSET3 RES., CHIP, 3.32k, 1/16W, 1%, 0603 VISHAY, CRCW060333K2FKEA

10 3 R1,R2, R9 RES., CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA

11 1 R6 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA

12 1 U1 I.C., LTM4615EV#PBF, LGA LINEAR TECH., LTM4615EV#PBF

Additional Demo Board Circuit Components

1 0 CO1, CO6 (OPT) CAP., 1206-0805

2 0 CSS1, CSS2, CP1, CP2, C3, C4 (OPT) CAP., 0603

3 0 COMP1, COMP2, CFF1, CFF2 (OPT) CAP., 0603

4 0 CO5, CO7, CO10, CO2(OPT) CAP., 1210-7343

5 0 R8 RES., CHIP, 0603

6 1 R5 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA

7 1 R10 RES., CHIP, 1M, 1W, 1%, 2512 PANASONIC, ERJM1WTJ1M0U

Hardware For Demo Board Only

1 3 JP1, JP2, JP3 2MM SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S

2 3 JP1, JP2, JP3 SHUNT, SAMTEC, 2SN-BK-G

3 7 TP8-TP11, TP22, TP2, TP3 BANANA JACK, KEYSTONE, 575-4

4 14 TP1, TP4-TP7, TP12-TP18, TP21, TP23 TESTPOINT, TURRET, .095” MILL-MAX, 2501-2-00-80-00-00-07-0

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

dc1367af

DEMO MANUAL DC1367A

SCHEMATIC DIAGRAM

A A

B B

ENABLED

DISABLED TRACK1

[email protected]

2.5V - 5.5V

6.3V

RUN1

6.3V

2))

581

(LDO)

[email protected]

1.8V@4A

OFF

MAX

6.3V

2.5V - 5.5V

DC1367A

Thursday, July 24, 2008

HELEN 11/28/07

Judy Sun 11/28/07

Dual Output Step-Down Power uModule with VLDO

LTM4615EV High Density

SIZE

SCALE:

CAGE CODE DWG NO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

DESIGNER

TECHNOLOGY

1630 McCarthy Blvd.

Milpitas,CA 95035

Phone: (408)432-1900

Fax : (408)434-0507

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VOUT2

VOUT1

VIN1 VIN2

VOUT1

VOUT2

VOUT1

VIN1

VIN2

VOUT1

TP21 VIN2+

RSET2 10K 1%

100K

LTM4615EV

K10

K11

K12

L10

L11

L12

M10

M11

M12

C10

C11

C12

D10

D11

D12

E11

E12

G10

G11

G12

H10

H11

H12

J10

J11

J12

A10

A11

A12

B10

B11

B12

E10

F10

F11

F12

VIN1

PGOOD1

VOUT1

COMP1

FB1

TRACK1

RUN/SS1

SW1

SW2

VIN2

PGOOD2

VOUT2

LDO_IN

EN3

COMP2

FB2

LDO_OUT

FB3

GND1

GND2

GND3

TRACK2

BOOST3

RUN/SS2

PGOOD3

GND3

CO6

(OPT)

CO9

100uF

6.3V

CCOMP1

(OPT)

TP22 VIN2

TP4

GND

TP7

VO1+

TP5

PGOOD1

CO3

22uF

RSET3

3.32K

TP16 GND

L1 0.2uH

CO7

(OPT) CO10

(OPT)

JP1

CIN9

10uF

10K 1%

R5 4.99K

CP2 (OPT)

10uF

6.3V

TP15 VO3

CFF1 (OPT)

TP17 PGOOD2

CIN3

10uF

CIN8

10uF

TP1

VIN1+

CO1

(OPT)

CO4

100uF

JP2

CFF2 (OPT)

R10 0.001

CSS2

(OPT)

RSET1 4.02K 1%

+CIN6

47uF

TP10 GND

CO8

22uF

6.3V

CIN5

10uF

CO5

(OPT)

TP2

VIN1 SW1

TP11

GND

JP3

TP6 VO2+

(OPT)

+CIN10

47uF

TP23 GND

CIN4

10uF

CO2

(OPT)

TP13

VO1-

TP3

GND

TP8 VOUT2

CSS1

(OPT)

100K

TP18

PGOOD3

CP1 (OPT)

TP12 VO2-

TP9

VOUT1

CCOMP2

(OPT)

100K

4.99K 1%

TP14

TRACK

SW2

dc1367af

DEMO MANUAL DC1367A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

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

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.:

DC1367A

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