Linear Technology DC2455A-B Quick setup guide

dc2455abf

DEMO MANUAL DC2455A-B

Description

LTM4650EY-1

High Efficiency, PolyPhase 150A Step-Down

Power µModule

Regulator

3× LTM4650EY-1, 150A

DemonstrationCircuit2455A-BfeaturesPolyPhase

design

using the LT M

4650EY-1 (B-grade), the high efficiency,

high density, dual 25A, switch mode step-down power

module regulator. The input voltage is from 4.5V to 15V.

The output voltage is jumper selectable from 0.9V to 1.8V.

DC2455A-B can deliver nominal 150A output current. As

explained in the data sheet, output current de-rating is

necessary for certainVIN,VOUT, and thermalconditions.The

LTM4650-1 on DC2455A-B always operate in continuous

conduction mode. The switching frequency can be pro-

grammed through a resistor or can be synchronized to an

external clock signal. The board allows the user to program

how its output voltage ramps up and down through the L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, PolyPhase and TimerBlox are

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

of their respective owners.

TRACK pin. The output voltage is tightly regulated between

“VO+”and “VO–”through remote output voltage sensing

which improves output voltage regulation at heavy loads.

These features and the availability of the LTM4650EY-1

in a compact 16mm × 16mm × 5.01mm BGA package

make it ideal for use in many high-density point-of-load

regulation applications. The LTM4650-1 data sheet must

be read in conjunction with this demo manual for working

on or modifying the demo circuit DC2455A-B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2455A-B

Figure 1. 3× LTM4650-1, 150A PolyPhase LTM4650-1/DC2455A-B Demo Board

dc2455abf

DEMO MANUAL DC2455A-B

Quick start proceDure

Demonstration circuit DC2455A-B is easy to set up to

evaluate the performance of PolyPhase operation of the

LTM4650EY-1. Due to the high input/output current, user

should select the proper input supply/load/cable which

can sustain the full load operation. It’s recommended to

pull load current from J2 and J4. The load current pulled

from J5 and J6 shouldn’t exceed 25A. Please refer to

Figure 2 for proper measurement setup and follow the

procedure below:

1. Place jumpers in the following positions for a typical

1.0VOUT application:

JP1 JP2 JP4~JP8

CLK RUN VOUT SELECT

INT OFF ON JP5 / 1.0V

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

and meters as shown in Figure 2. Preset the load to 0A

and VIN supply to 12V.

3. Turn on the power supply at the input. Place JP2 to ON

position. The output voltage between “VO+”and “VO–”

should be 1.0V ± 1.5% (0.985V~1.015V).

4. Once the proper output voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, output voltage ripple, efficiency

and other parameters. Output voltage ripple should be

measured at J11 with BNC cables. 50Ω termination

should be set on the oscilloscope or BNC cables.

5. (Optional) For optional load transient test, apply an

adjustable pulse signal between “IOSTEP CLK”and

“GND” test point. Pulse amplitude (3V~3.5V) sets the

load step currentamplitude. Theoutput transientcurrent

can be monitored at the BNC connector J12 (5mV/A).

The pulse signal should be very small duty cycle (<

10%) to limit the thermal stress on the transient load

circuit.

6. (Optional) LTM4650-1 can be synchronized to an exter-

nal clock signal. Place the JP1 jumper on EXT and apply

a clock signal (0~5V, square wave) on the “EXT_CLK”

test point.

7. (Optional) The outputs of LTM4650-1 can track another

supply. The output voltage tracks the voltage on TRACK

when a valid signal is applied on the test point.

8. (Optional) DC2455A-B can be configured to a dual

outputs configuration with VOat 125A load current

and VO2 at 25A load current. Stuff 0Ω resistor on R61

and 0.1µF on C14. Remove R22, R23, R24, R26, R27,

R28, R32, R33, R35. Output voltage VO2 is set by R37

based on the equation VO2 = 0.6V(1 + 60.4k/R37).

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS / NOTES VALUE

Input Voltage Range 4.5V ~ 15V

Output Voltage VOUT VIN = 4.5V to 15V, IOUT = 0A to 150A, JP5: 1.0V 1.0V ± 1.5% (0.985V ~ 1.015V)

Maximum Continuous Output Current De-rating is necessary for certain VIN, VOUT and thermal

conditions, see data sheet for detail.

150A

Default Operating Frequency 500kHz

Resistor Programmable Frequency Range 400kHz – 780kHz

External Clock Sync. Frequency Range 400kHz – 780kHz

Efficiency VIN = 12V, VOUT = 1.0V, IOUT = 150A, fSW = 500kHz 86.1% See Figure 3

Load Transient VIN = 12V, VOUT = 1.0V, ISTEP = 72A to 112.5A < 53mV, See Figure 4

dc2455abf

DEMO MANUAL DC2455A-B

Quick start proceDure

+–

1mΩ

VOUT0

LOAD

0A~150A

+–

VIN

4.5V TO 16V

––

Figure 2. Test Setup of DC2455A-B

Figure 3. Measured Efficiency VIN = 12V, fSW = 500kHz

LOAD CURRENT (A)

EFFICIENCY (%)

100

4020 60

DC2455AB F03

14080 120100

VO= 1V

VO= 1.5V

dc2455abf

DEMO MANUAL DC2455A-B

Quick start proceDure

X-AXIS (?)

DC2455AB F04

1V VO(20MHz BW)

20mV/DIV

AC-COUPLED

75A TO 112.5A

LOAD

X-AXIS (?)

DC2455AB F05

VOUT (20MHz BW)

5mV/DIV

Figure 4. Load Transient 75A to 112.5A

(VIN = 12V, VOUT1 = 1V, fSW = 500kHz)

Figure 5. Output Voltage Ripple (VIN = 12V,

VOUT1 = 1V, IOUT = 150A, fSW = 500kHz)

Figure 6. Thermal Performance at VIN = 12V, VOUT = 1V, IOUT = 150A, TA= 23.8°C, 200LFM Air Flow

dc2455abf

DEMO MANUAL DC2455A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP, 150µF 25% 25V ALUM SUN ELECT., 25HVH150M

2 2 CIN2, CIN11 CAP, 1206 1µF 10% 25V X5R TAIYO YUDEN, TMK316BJ105KD-T

3 8 CIN3-CIN10 CAP, 1210 22µF 10% 25V X5R AVX, 12103D226KAT2A

4 4 CIN12-CIN15 CAP, 1210 22µF 10% 25V X5R AVX, 12103D226KAT2A

5 16 CO1, CO2, CO5, CO6, CO7, CO8, CO11, CO13,

CO15, CO16, CO24, CO55, CO56, CO57,

CO58, CO59

CAP, 1206 220µF 20% 4V X5R MURATA, GRM31CR60G227ME11L

6 8 CO20, CO21, CO26, CO27, CO33, CO36,

CO52, CO54

CAP, 1206 220µF 20% 4V X5R MURATA, GRM31CR60G227ME11L

7 1 C1 CAP, 0603 330pF 10% 50V X7R AVX, 06035C331KAT2A-CT

8 4 C4, C10, C18, C22 CAP, 0603 4.7µF 20% 10V X5R TAIYO YUDEN, LMK107BJ475MA-T

9 7 C6, C11, C19, C23, COUT26, C42, C43 CAP, 0603 1µF 10% 10V X7R TAIYO YUDEN, LMK107BJ105KA-T

10 1 C7 CAP, 0603 0.1µF 10% 25V X7R AVX, 06033C104KAT2A

11 1 C31 CAP, 0603 15nF 10% 50V X7R AVX, 06035C153KAZ2A

12 1 C39 CAP, 0603 100nF 10% 100V X7R MURATA, GRM188R72A104KA35D

13 1 C40 CAP, 0603 150pF 5% 50V C0G AVX, 06035A151JAT2A

14 2 C41, C48 CAP, 1210 100µF 10V X5R MURATA, GRM32ER61A107ME20L

15 8 C41, C44, C45, C48, C52, C53, C54, C55 CAP, 1210 100µF 10% 6.3V X5R MURATA, GRM32ER60J107ME20L

16 1 C46 CAP, 1210 10µF 16V X5R MURATA, GRM32DR61C106KA01L

17 1 C47 CAP, 0603 220pF 10% 50V X7R AVX, 06035C221KAT2A

18 1 C49 CAP, 0603 47nF 10% 50V X7R AVX, 06035C473KAZ2A

19 1 L1 IND, 68µH, CDRH105 SUMIDA CDRH105RNP-680N

20 2 Q1, Q2 MOSFET, N-CH D-S 40V TO252 VISHAY, SUD50N04-8M8P-4GE3

21 4 R1, R3, R25, R29 RES, 0603 10Ω 5% 1/10W VISHAY, CRCW060310R0JNEA

22 9 R2, R9, R14, R21, R31, R39, R43, R47, R51 RES, 0603 121kΩ 1% 1/10W VISHAY, CRCW0603121KFKEA

23 4 R4, R36, R41, R98 RES, 0603 10kΩ 5% 1/10W VISHAY, CRCW060310K0JNEA

24 1 R11 RES, 0603 1.74kΩ 1% 1/10W VISHAY, CRCW06031K74FKEA

25 1 R15 RES, 0603 90.9kΩ 1% 1/10W VISHAY, CRCW060390K9FKEA

26 1 R16 RES, 0603 60.4kΩ 1% 1/10W VISHAY, CRCW060360K4FKEA

27 1 R17 RES, 0603 40.2kΩ 1% 1/10W VISHAY, CRCW060340K2FKEA

28 1 R18 RES, 0603 30.1kΩ 1% 1/10W VISHAY, CRCW060330K1FKEA

29 1 R89 RES, 0603 2Ω 1% 1/10W VISHAY CRCW06032R00FNEA

30 1 R92 RES, 0603 3.3Ω 1% 1/10W VISHAY, CRCW06033R3FKEA

31 1 R93 RES, 0603 154kΩ 1% 1/10W VISHAY, CRCW0603154KFKEA

32 1 R94 RES, 0603 1MΩ 5% 1/10W VISHAY CRCW06031M00JNEA

33 3 R95, R96, R107 RES, 0603 20kΩ 5% 1/10W VISHAY, CRCW060320K0JNTA

34 1 R97 RES, 0603 681kΩ 1% 1/10W VISHAY, CRCW0603681KFKEA

35 1 R99 RES, 0603 301Ω 1% 1/10W VISHAY, CRCW0603301RFKEA

36 1 R100 RES, 0603 82.5Ω 1% 1/10W VISHAY, CRCW060382R5FKEA

37 2 R101, R102 RES, 2512 0.010Ω 1% 1W VISHAY, WSL2512R01000FEA

38 1 R103 RES POT, 5k BOURNS 3386P-1-502-LF

39 1 R104 RES, 0603 1kΩ 1% 1/10W VISHAY, CRCW06031K00FKEA

dc2455abf

DEMO MANUAL DC2455A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

40 1 R105 RES, 0603 105kΩ 1% 1/10W VISHAY CRCW0603105KFKEA

41 1 R106 RES, 0603 80.6kΩ 1% 1/10W VISHAY CRCW060380K6FKEA

42 3 U1, U2, U3 IC, VOLTAGE REGULATOR, BGA LINEAR TECH., LTM4650EY-1B#PBF

43 1 U5 IC, TimerBlox

LINEAR TECH., LTC6992IS6-1#PBF

44 1 U6 IC, OP-AMP, SINGLE, BIPOLAR LINEAR TECH., LT1803IS5#PBF

45 1 U7 IC, LTC3630EMSE LINEAR TECH., LTC3630EMSE#PBF

Additional Demo Board Circuit Components

1 0 CIN16-CIN19, CO22, CO28, CO30, CO32,

CO34, CO35, CO48, CO50

CAP, OPTION OPTION

2 0 CO3, CO9, CO14, CO17, CO18, CO38, CO40,

CO42, CO45, CO46

CAP, 1210 OPTION OPTION

3 0 CO4, CO10, CO12, CO19, CO23, CO25, CO29,

CO31, CO37, CO39, CO41, CO43, CO44,

CO47, CO49, CO51, CO53

CAP, 7343 OPTION OPTION

4 0 C2, C3, C5, C8, C9, C12, C17, C20, C21, C29,

C30, C32

CAP, 0603 OPTION OPTION

5 0 R5, R7, R8, R10, R30, R37, R38, R42, R44,

R48, R49, R50, R52, R53, R55, R61, R64,

R87

RES, 0603 OPTION OPTION

6 13 R6, R19, R20, R27, R28, R32, R33, R35,

R40, R45, R62, R63, R91

RES, 0603 0Ω JUMPER VISHAY, CRCW06030000Z0EA

7 2 R13, R34 RES, 0603 0Ω JUMPER VISHAY, CRCW06030000Z0EA

8 4 R22, R23, R24, R26 RES, 2010 0Ω JUMPER VISHAY, CRCW20100000ZEA9

9 1 R60 RES, 1206 0Ω JUMPER VISHAY, CRCW12060000ZOEA

10 0 U4 DO NOT STUFF

Hardware: For Demo Board Only

1 11 E1-E4, E6-E9, E12, E13, E22 TESTPOINT, TURRET, .063" MILL MAX, 2308-2-00-80-00-00-07-0

2 0 E5, E10, E11, E14, E15, E16, E17, E18, E23,

E24, E25, E26, E27, E28, E29, E30

TEST PAD SMD

3 2 E33, E34 TESTPOINT, TURRET, .094" MILL MAX, 2501-2-00-80-00-00-07-0

4 4 JP1, JP2, JP9, JP10 HEADER, 3 PIN 2mm SINGLE ROW WURTH ELEKTRONIK, 620-003-111-21

5 5 JP4, JP5, JP6, JP7, JP8 HEADER, 2 PIN 2mm SINGLE ROW WURTH ELEKTRONIK, 620-002-111-21

6 6 J1, J2, J3, J4, J13, J14 STUD, TEST PIN PEM, KFH-032-10

7 12 J1, J2, J3, J4, J13, J14 (×2) NUT, BRASS PL # 10-32 ANY, 10-32M/S BR PL

8 6 J1, J2, J3, J4, J13, J14 LUG RING, #10 KEYSTONE, 8205

9 6 J1, J2, J3, J4, J13, J14 WASHER, TIN PLATED BRASS ANY, #10EXT BZ TN

10 2 J11, J12 CON, BNC, 5 PINS CONNEX, 112404

11 5 XJP1, XJP2, XJP4, XJP9, XJP10 SHUNT 2mm WURTH ELEKTRONIK, 608-002-134-21

12 4 MTGS AT 4 CORNERS STAND-OFF, NYLON KEYSTONE, 8833

dc2455abf

DEMO MANUAL DC2455A-B

schematic Diagram



VOUT

SELECT

NOTE:UNLESSOTHERWISESPECIFIED,

1.ALLCAPACITORS,RESISTORS0603.

ASSY I.C.

‐A U1,U2

U1,U2,U3

U1,U2,U3,U4

‐B

‐C

100A

150A

200A

Iout

OPT

R13

OPT

R34

OPT

22uF

Cin12, 13, 14, 15

OPT

22uF

Cin16, 17, 18, 19

OPT

220uF

Co20, 21,26,27

OPT

220uF

Co34,35,48,50

*Co33,36,52,54

Co22,28,30,32

LTM4650EY‐1

DEMOCIRCUIT2455A‐(A,B,C)

VFB

PGOOD

COMP

RUN

TRACK

VOUT

VFB

PGOOD

COMP

RUN

TRACK

DIFFP

DIFFN

VFB

PGOOD

COMP

CLKOUT_U1

RUN

TRACK

VFB

VIN

INTVCC_U1

VOUT

VO+

VO-

VO+

INTVCC_U1

VIN

VO+ VO-

VOUT

EXTVCC

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION-1 05/22/16

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION-1 05/22/16

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION-1 05/22/16

E23

Vout

CO4

OPT

7343

330pF

CO39

OPT

7343

4.5V -15V

VIN

CO9

OPT

1210

CO8

220uF

1210

E5 SW1-1

CIN6

22uF

25V

1210

1uF

10V

R60

0 Ohm

1206

121k

CO1

220uF

1210

LTM4650EY-1

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUTS1

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUTS2

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

R62

0 Ohm

VO+

R16

60.4K

CIN4

22uF

25V

1210

OPT

CIN1

150uF

25V

JP1

EXT

INT

CLK

R13

GND

CIN2

1uF

25V

1206

E10 SW2-1

VIN-

CIN3

22uF

25V

1210

R18

30.1K

GND

OPT

CO10

OPT

7343

R17

40.2K

CO42

OPT

1210

OPT

C31

15nF

CO6

220uF

1210

0.6 - 1.8V

VOUT

E22

SGND

10K

CO7

220uF

1210

R11

1.74K

R14

121K

CO5

220uF

1210

EXT_CLK

CIN5

22uF

25V

1210

JP5

1.0V

R63

0 Ohm

JP6

1.2V

VO-

CO2

220uF

1210

JP7

1.5V

121K

JP4

0.9V

0.1uF

JP2

OFF

RUN

JP8

1.8V

TRACK

PGOOD

CO41

OPT

7343

CO3

OPT

1210

0 Ohm

4.7uF

10V

VIN+

E24 Vout

OPT

CO40

OPT

1210

R10

OPT

R15

90.9K

EXTVCC

dc2455abf

DEMO MANUAL DC2455A-B

schematic Diagram

B B

A A



REMOVE 0 OHM JUMPERS

FOR SEPARATE VOUT2_U2.

DEMOCIRCUIT2455A‐(A,B,C)

LTM4650EY‐1

COMP_U2

RUN_U2

COMP

TRACK_U2

VFB

PGOOD

RUN

TRACK

PGOOD_U2

DIFFOUT_U2

VFB_U2

PGOOD_U2

VFB_U2

RUN_U2

COMP_U2

TRACK_U2

COMP

CLKOUT_U1

CLKOUT_U2

RUN

TRACK

PGOOD

VFB

VOUT

INTVCC_U2

VOUT2_U2

VIN

EXTVCC

INTVCC_U2

VO2+

VO2-

VO2+ VO2-

INTVCC_U2

VO2+

VOUT2_U2VOUT

VOUT2_U2

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, CD/CD

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, CD/CD

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, CD/CD

N/A

STEP-DOWN MODULE REGULATOR

R22

0 Ohm

2010

C11

1uF

10V

CO14

OPT

1210

C13

OPT

CIN9

22uF

25V

1210

J13

GND

R23

0 Ohm

2010

R27

0 Ohm

CO12

OPT

7343

OPT

C32

OPT

J14

VOUT2_U2

VOUT/

CO43

OPT

7343

OPT

CO25

OPT

7343

R24

0 Ohm

2010

R21

121K

C15

OPT

E25 Vout

R31

121K

R20

0 Ohm

R25

CO44

OPT

7343

CO56

220uF

1210

R61

OPT

CO38

OPT

1210

CO19

OPT

7343

R26

0 Ohm

2010

CO45

OPT

1210

CO57

220uF

1210

CO13

220uF

1210

CO46

OPT

1210

LTM4650EY-1

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUTS1

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUTS2

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

R19

0 Ohm

R34

R64

OPT

CIN10

22uF

25V

1210

R32

0 Ohm

R33

0 Ohm

R35

0 Ohm

C14

OPT

E26

Vout2

E11 SW1-2

R28

0 Ohm

R38

OPT

CO18

OPT

1210

CIN8

22uF

25V

1210

CO16

220uF

1210

R37

OPT

R36

10K

C10

4.7uF

10V

CO11

220uF

1210

R29

CIN7

22uF

25V

1210

CO15

220uF

1210

E13

VO2-

E12

VO2+

C12

OPT

R30

OPT

E14

SW2-2

CO17

OPT

1210

dc2455abf

DEMO MANUAL DC2455A-B

schematic Diagram

D D

C C

B B

A A



DEMOCIRCUIT2455A‐(A,B,C)

LTM4650EY‐1

COMP

RUN

COMP

CLKOUT_U2

CLKOUT_U3

PGOOD

RUN

VFB

TRACK

PGOOD

TRACK

VFB

COMP

CLKOUT_U2

CLKOUT_U3

RUN

VFB

PGOOD

TRACK

VOUT

INTVCC_U3

VOUT

VIN

EXTVCC

INTVCC_U3

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

CO49

OPT

7343

C17

OPT

CO23

OPT

7343

CO58

220uF

1210

R39

121K

1% CO20

1210

CO29

OPT

7343

CO28

1210

C16

OPT

R40

0 Ohm

CIN11

1uF

25V

1206

E16

SW2-3

CIN15

25V

1210

CO47

OPT

7343

LTM4650EY-1

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUTS1

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUTS2

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

E27 Vout CO21

1210

R44

OPT

R41

10K

CIN13

25V

1210

R43

121K

R42

OPT

CO27

1210

CO48

1210

CO50

1210

E28 Vout

CO26

1210

E15 SW1-3

C19

1uF

10V

C18

4.7uF

10V

CO22

1210

CIN14

25V

1210

CO24

220uF

1210

CIN12

25V

1210

dc2455abf

DEMO MANUAL DC2455A-B

schematic Diagram



DEMOCIRCUIT2455A‐(A,B,C)

LTM4650EY‐1

COMP

RUN

COMP

TRACK

VFB

PGOOD

RUN

VFB

TRACK

PGOOD

CLKOUT_U3

VFB

COMP

CLKOUT_U3

RUN

TRACK

PGOOD

INTVCC_U4

VOUT

VIN

EXTVCC

INTVCC_U4

VO+

VO-

VOUT

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

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

Monday, May 23, 2016

HIGH EFFICIENCY, POLYPHASE, DC/DC

N/A

STEP-DOWN MODULE REGULATOR

R53

OPT

R49

OPT

C22

4.7uF

10V

R51

121K

CO52

1210

CO30

1210

R47

121K

CO36

1210

R48

OPT

CIN19

25V

1210

R52

OPT

C23

1uF

10V

CO54

1210

C21

OPT

R45

0 Ohm

R50

OPT

CO34

1210

CO33

1210

CIN16

25V

1210

E18 SW2-4

C30

OPT

R55

OPT

CO32

1210

CIN18

25V

1210

C29

OPT

CO35

1210

E17

SW1-4

CO53

OPT

7343

E29 Vout CO55

220uF

1210

CO37

OPT

7343

CO59

220uF

1210

CIN17

25V

1210

E30 Vout

LTM4650EY-1

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUTS1

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUTS2

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

CO51

OPT

7343

C20

OPT

CO31

OPT

7343

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