Linear Technology LTM4616 Quick setup guide

dc1245afa

DEMO MANUAL DC1245A

Description

LTM4616

Dual 2.7VIN(MIN), 8A Step-Down

µModule Regulator

Demonstration circuit 1245A features the LT M

4616, the

high efficiency, high density, dual output switch mode

power module. The rated load current is 8A for each chan-

nel, while derating is necessary for certain VIN, VOUT, and

thermal conditions. By applying a clock signal to the CLKIN

pin, the module’s switchingfrequency may besynchronized

from 0.75MHz to 2.25MHz. The same clock frequency is

available at the CLKOUT pin with the phase relationship

between CLKIN and CLKOUT determined by the PHMODE

pin. This feature can be used notonly to reduce undesirable

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

frequency harmonics but also to parallel the two channels

of LTM4616 or even multiple LTM4616s and LTM4608s to

provide higher output currents. The LTM4616 data sheet

must be read in conjunction with this demo manual prior

to working on or modifying demo circuit DC1245A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1245A

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range 2.7V to 5.5V

Output Voltage VOUT1

VOUT2

VIN = 3.3V, IOUT1 = 8A

IOUT2 = 8A

1.8 ±2%

1.2 ±2%

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

Conditions, See Data Sheet for Details

8ADC Each Channel

Default Operating Frequency 1.5MHz

Efficiency VIN = 5V, VOUT1 = 1.8V, VOUT2 = 1.2V, 8A Per Channel 77.5%, See Figure3 for More Information

Load Transient VIN = 3.3V, VOUT1 =1.8V; VOUT2 = 1.2V See Figures 4 and 5 for Details

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dc1245afa

DEMO MANUAL DC1245A

qUick stArt proceDUre

Demonstration circuit 1245A is an easy way to evaluate

the performance of the LTM4616. 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

1.8VOUT and 1.2VOUT application:

PHMODE2 MARGINING2 RUN2 MARGINING1

2PH NO ON NO

TRACK1 PHMODE1 MODE RUN1

DISABLED 2PH BURST ON

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

and meters as shown in Figure 1. Preset the load to 0A

and VIN supply within the 2.7V to 5.5V operating range.

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

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

at 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. To synchronize channel 1 to an external clock, please

apply the desired clock signal to CLKIN and SGND1.

The external clock signal should have amplitude of at

least 2V but less than VIN.

6. VOUT1 can track another supply connected at TP20 as

determined by resistors R6 and R17. VOUT2 is set up

to track VOUT1 in a manner determined by resistors

R15 and R16. By default both resistor pairs have been

selected to support coincident tracking. Please refer to

Figure 6 for reference.

Figure 1. Test Setup of DC1245A

Figure 2. Proper Scope Probe Placement

for Measuring Input or Output Ripple

Figure 3. Measured Overall Supply Efficiency with Different VIN

Overall Efficiency vs Load Current

INPUT OR OUTPUT CAPACITOR

LOAD CURRENT FOR EACH CHANNEL (A)

EFFICIENCY (%)

35 62

dc1245a F03

4 8

VIN = 3.3V, VO1 = 1.8V, VO2 = 1.2V

VIN = 5V, VO1 = 1.8V, VO2 = 1.2V

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dc1245afa

DEMO MANUAL DC1245A

IN = 3.3V

OUT =1.8V

CONTINUOUS CURRENT MODE (CCM)

TO 6A LOAD STEP

OUT = ×2 100µF CERAMIC (1210, X5R, 6.3V) +

22µF CERAMIC (0805, X5R, 6.3V)

FF1 = 47pF

VOUT

OVERSHOOT AND UNDERSHOOT = 172mV

dc1245a F04

IN = 3.3V

OUT =1.2V

CONTINUOUS CURRENT MODE (CCM)

2A TO 6A LOAD STEP

OUT = ×2 100µF CERAMIC (1210, X5R, 6.3V) +

22µF CERAMIC (0805, X5R, 6.3V)

FF2 = 0pF

VOUT

OVERSHOOT AND UNDERSHOOT = 128mV

dc1245a F05

qUick stArt proceDUre

Figure 4. Measured Load Transient Response for 1.8VOUT

(4A Step, 25% to 75%)

Figure 5. Measured Load Transient Response for 1.2VOUT

(4A Step, 25% to 75%)

Figure 6. Measured Tracking Performance of VOUT1 and VOUT2

(with 2A Load Current)

7. Channel 2 is set up to synchronize to the CLKOUT sig-

nal of channel 1. The default phase difference is 180°.

Please refer to data sheet for how to set up PHMODE1

and PHMODE2 for paralleling more than 2 channels.

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dc1245afa

DEMO MANUAL DC1245A

pArts list

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 4 CIN1, CIN2, CO13, CO23 Capacitor, X5R, 22µF, 6.3V, 20%, 1206 AVX, 12066D226MAT2A

2 1 CIN4 Capacitor, OS-CON, 150µF, 10V, E7 Size Sanyo, 10SVPA150MAA

3 4 CO11, CO12, CO21, CO22 Capacitor, X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

4 1 RSET1 Resistor, Chip, 4.99k, 1/16W, 1%, 0402 Vishay, CRCW04024K99FKED

5 1 RSET2 Resistor, Chip, 10k, 1/16W, 1%, 0402 Vishay, CRCW040210K0FKED

6 1 U1 IC LTM4616EV 144-Pin LGA Linear Technology, LTM4616EV

Additional Demo Board Circuit Components

1 0 CO14, CO15, CO24, CO25 (OPT) Capacitor, 1210-3743

2 2 R7, R5 Resistor, Chip, 100k, 1/16W, 5%, 0402 Vishay, CRCW0402100KJNED

3 0 R9, R11, R19 (OPT) Resistor, Chip, 0402

4 0 CTHP1, CTHP2, C1, CFF2, CSP (OPT) Capacitor, 0402

5 1 CFF1 Capacitor, C0G, 47pF, 50V, 10%, 0402 AVX, 04025A470KAT2A

6 1 R17 Resistor, Chip, 4.99k, 1/16W, 1%, 0402 Vishay, CRCW04024K99FKED

7 3 R15, R16, R6 Resistor, Chip, 10k, 1/16W, 1%, 0402 Vishay, CRCW040210K0FKED

8 1 R18 Resistor, Chip, 0, 1/16W, 0402 Vishay, CRCW04020000Z0ED

Hardware/Components (For Demo Board Only)

1 0 CIN3(OPT) Capacitor, 1210-3743

2 5 JP1, JP2, JP3-JP5 2 ×3, 0.079 Double Row Header Samtec, TMM103-02-L-D

3 3 JP6, JP7, JP9 Header 3-Pin 0.079 Single Row Samtec, TMM103-02-L-S

4 8 JP1-JP7, JP9 Shunt, 0.079" Center Samtec, 2SN-BK-G

5 15 TP1, TP2, TP7-TP10, TP12, TP14-TP18,

TP20-TP22

Testpoint, Turret, 0.094" Pbf Mill-Max, 2501-2-00-80-00-00-07-0

6 2 TP6, TP3 Stud, Test Pin PEM KFH-032-10

7 4 TP6, TP3 Nut, Brass Nuts #10-32 Any #10-32

8 2 TP6, TP3 Ring, Lug Ring #10 Keystone #10

9 2 TP6, TP3 Washer, Tin Plated Brass Any #10

10 4 TP4, TP5, TP11, TP13 Jack Banana Keystone, 575-4

11 4 (STAND-OFF) Stand-Off, Nylon 0.50" Keystone, 8833(SNAP ON)

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dc1245afa

DEMO MANUAL DC1245A

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

VIN+

VIN-

VIN

GND

2.5V - 5.5V

PGOOD1

PGOOD2

LOW

BURST

(PULSE SKIPPING) PS

(CONTINUOUS) CON

ITH2

ITHM2

2PH (PHASE)

3PH (PHASE)

4PH (PHASE)

MARGINING1

MODE

PHMODE1

TRACK1

DISABLED

ENABLED

RUN1

OFF

TRACK

CLKIN

SGND1

VOUT1

GND1

VO1+

VO1-

VOUT2

VO2+

VO2-

GND2

4PH (PHASE)

LOW

MARGINING2

2PH (PHASE)

3PH (PHASE)

PHMODE2

CLKOUT

VFB

OFF

RUN2

1.8V @ 8A MAX

1.2V @ 8A MAX

IN LAYOUT, MANUALLY TIED ALL GND TOGETHER ON LAYER 2.

DC1245A

Friday, February 15,2008

J. Wu 3/7/07

M. Xie 3/7/07

Dual 8A High Density Step-Down Power Module

LTM4616EV

SIZE

SCALE:

CAGECODE DWGNO REV

SHEET OF

FILENAME:

TITLE

CONTRACT NO.

APPROVALS DATE

DRAWN

CHECKED

APPROVED

ENGINEER

TECHNOLOGY

1630 McCarthyBlvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

THIS CIRC UIT IS PR OPR IETARY TOLINEAR TECHNOLOGY AND

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

LINEAR TE CHNOLOGY HAS MADE A BEST EFFORT TO DESIGNA

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT R EMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PR OPE R AND RELIABL E OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION ANDPRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR R ELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEER ING FOR ASSISTANCE.

CUSTOMER NOTICE

VIN

ITH2

ITHM2

CLK

VOUT1

ITH2

ITHM2

MODE

VOUT2

VFB

VOUT1

CLK

SVIN1

SVIN1 SVIN1

SVIN2

VOUT1

VOUT2

TP13

TP6

JP5

PBS1

R16

10.0K

CO15

opt

6.3V

JP2

PFB1

TP21

opt

CTHP2

opt.

100K

CIN1

22uF

6.3V

R18 0

CIN3

100uF

opt

TP16

JP4

TP2

CO24

opt

6.3V

JP7

10K

*DC1245A STILL USES THE OLD METHOD TO DISABLE MARGINING.

AN IMPROVED METHOD OF TYING THE MGN PIN TO A VOLTAGE DIVIDER

WITH 50k RESISTORS FROM V

TO GROUND IS RECOMMENDED NOW.

TP22

LTM4616EV

A12

B10

B11

B12

A10

A11

C10

C11

C12

D10

D11

D12

E10

E11

E12

F10

F11

F12

G10

G11

G12

H10

H11

H12

J10

J11

J12

K10

K11

K12

L10

L11

L12

M10

M11

M12

GND1

BSEL1

CLKIN1

MODE1

GND1

SW1

GND1

PHMODE1

MGN1

PGOOD1

VIN1

GND1

VIN1

GND1

FB1

VOUT1

VIN1

SVIN1

PLLFLTR1

ITHM1

TRACK1

VOUT1

VIN1

SGND1

RUN1

CLKOUT1

ITH1

VOUT1

GND2

BSEL2

CLKIN2

MODE2

PHMODE2

MGN2

PGOOD2

GND2

SW2

GND2

VIN2

GND2

VIN2

GND2

FB2

VOUT2

VIN2

PLLFLTR2

ITHM2

SVIN2

TRACK2

VIN2

SGND2

RUN2

CLKOUT2

ITH2

CO23

22uF

6.3V

TP8

CIN2

22uF

6.3V

TP1

R17

4.99K

CO12

100uF

6.3V

CO14

opt

6.3V

CFF2 opt

PFB2

TP4

CFF1 47pF

R11 opt

CO22

100uF

6.3V

R19

opt

TP10

JP1

1 2

5 6

TP18

TP7

CSP

opt

TP5

TP14

TP20

R9 opt

TP3

TP12

CTHP1

opt.

TP15

CO21

100uF

6.3V

CO25

opt

6.3V

TP11

RSET2 10.0K 1%

PBS2

RSET1

4.99K

R15

10.0K

TP17

CO13

22uF

6.3V

100K

JP3

1 2

JP6

CO11

100uF

6.3V

CIN4

150uF

10V

JP9

TP9

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dc1245afa

DEMO MANUAL DC1245A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0913 REV A • 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

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