Linear Technology LTC3875EUJ Quick setup guide

dc2055afa

DEMO MANUAL DC2055A

DESCRIPTION

LTC3875EUJ

High Efficient, Single Output

Synchronous Buck Converter

with Very Low DCR Inductor

Demonstration circuit 2055A is a high efficiency, high

density, 4-phase synchronous buck converter with a 4.5V

to 14V input voltage range. It can supply up to 120A of

load current with a 1.0V output. This demo board has two

each LT C

3875EUJ feature-rich dual-phase synchronous

current mode buck controllers with very low DCR current

sensing capability,on-chip drivers and remote output volt-

age sensing. This board is set up with 0.32mΩ DCR output

inductors. The temperature compensation function can

guarantee accurate current limit over a wide temperature

range with DCR sensing.

The LTC3875 is suitable for inputs from 4.5V to 38V and

outputs up to 3.5V. It can provide a high efficiency, high

power density and versatile power solution for telecom

and datacom systems, industrial, medical instruments, L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

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

owners.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

and DC power distribution. The LTC3875 is available in a

40-lead 6mm ×6mm QFN package.

To shut down the converter, set the RUN pin voltage below

1.0V (SW1 and SW2: both OFF). Use JP1 jumper to select

Burst Mode

operation, pulse-skipping mode or forced

continuous mode operation at light load. The switching

frequency is pre-set at about 400kHz, and it can be easily

modified from 250kHz to 720kHz. An onboard dynamic

circuit is also available for a load transient test. Please

see LTC3875 data sheet for more detailed information.

Design files for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 14V

Output Voltage, VOUT VIN = 4.5 to 14V, IOUT = 0A to 120A 1.0V ±2%

Maximum Output Current, IOUT VIN = 4.5 to 14V, VOUT = 1.0V 120A

Typical Efficiency, VOUT VIN = 12V, VOUT = 1.0 V, IOUT = 120A 87.1%, See Figure 3

Typical Switching Frequency 400kHz

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dc2055afa

DEMO MANUAL DC2055A

QUICK START PROCEDURE

Demonstration circuit 2055A is easy to set up to evaluate

the performance of the LTC3875EUJ. Refer to Figure 1 for

the proper measurement equipment setup and follow the

procedure below:

1. With power off, connect the input power supply to VIN

(4.5V-14V) and GND (input return).

2. Connect the 1.0V output load between VOUT1 and GND

(Initial load: no load).

3. Connect the DVMs to the input and outputs. Set default

jumper position:

4. Turn on the input power supply and check for the proper

output voltages. VOUT1 should be 1.0V ±2%.

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

just the loads within the operating range and observe

the output voltage regulation, ripple voltage and other

parameters.

Note: When measuring the output or input voltage ripple,

do not use the long ground lead on the oscilloscope probe.

See Figure 2 for the proper scope probe technique. Short,

stiff leads need to be soldered to the (+) and (–) terminals

of an output capacitor. The probe’s ground ring needs to

touch the (–) lead and the probe tip needs to touch the

(+) lead.

JP1 JP2 JP3 JP4 JP5 JP6 SW1 SW2

MODE PHASMD1 ENTMPB1 ENTMPB1 BIAS PHASMD1 RUN1 RUN2

CCM 90° OFF OFF OFF 90° ON ON

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DEMO MANUAL DC2055A

QUICK START PROCEDURE

+ –

VOUT GND

COUT

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Output Voltage Ripple

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dc2055afa

DEMO MANUAL DC2055A

LOAD CURRENT (A)

060 100

20 40 80 120

CHANNEL CURRENT (A)

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

VIN = 12V

VOUT = 1.0V

fSW = 400kHz

LOAD CURRENT (A)

EFFICIENCY (%)

20 40 60 80 100 120

VIN = 12V

VOUT = 1.0V

fSW = 400kHz

QUICK START PROCEDURE

Figure 3. Efficiency vs Load Current

Figure 5. Current Sharing vs Load Current

Figure 6. Output Voltage Ripple at VIN = 12V, VOUT = 1.0V,

IOUT = 120A, fSW = 400kHz

Figure 7. Transient Performance at VIN = 12V, VOUT = 1.0V,

IOUT = 0A to 30A, fSW = 400kHz

Figure 4. Thermal Performance at VIN = 12V, VOUT = 1.0V,

IOUT = 120A, 200LFM Forced Air Flow

VOUT (20MHz BW) [20mV/DIV]

VOUT (20MHz BW) [50mV/DIV]

0A TO 30A

LOAD STEP

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dc2055afa

DEMO MANUAL DC2055A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CIN1, CIN18 CAP., OS-CON, 270µF, 16V, 20%, E12 SANYO, 16SVPC270M

2 12 COUT1, COUT3, COUT7, COUT8, COUT13,

COUT15, COUT19, COUT20, C29, C30, C33,

C34

CAP., X5R, 100µF, 6.3V, 20%,1210 AVX 12106D107MAT2A

3 12 COUT2, COUT4-COUT6, COUT9-COUT12,

COUT14, COUT16-COUT18

CAP., OS-CON, 330µF, 2.5V, 20%, 7343 SANYO, 2R5TPE330M9

4 4 L1, L2, L3, L4 IND, 0.25µH WURTH ELECT.,744301025

5 4 Q1, Q3, Q14, Q16 OPTIMOS POWER-TRANSISTOR, PG-TDSON-8 25V INFINEON, BSC050NE2LS

6 4 Q2, Q4, Q13, Q15 OPTIMOS POWER-TRANSISTOR, PG-TDSON-8 25V INFINEON, BSC010NE2LSI

7 2 U1, U3 IC, LTC3875IUJ, QFN 6mm ×6mm LINEAR TECH., LTC3875IUJ#PBF

8 1 U2 IC, LT1763CDE, DFN 4mm ×3mm LINEAR TECH., LT1763CDE-SD

Additional Demo Board Circuit Components

9 10 CIN2-CIN5, CIN13-CIN16, C27, C28 CAP., X5R, 10µF,16V, 10%, 1210 AVX 1210YD106KAT2A

10 0 C1, C5, C6, CIN6-CIN12, CIN17, C23, C24,

C26, C37, C48, C49, C54, C55, C58, C59,

C63

CAP., OPTIONAL

11 5 C2, C7, C18, C38, C42, C43 CAP., X5R, 0.1µF, 16V, 10%, 0603 AVX 0603YD104KAT2A

12 8 C3, C4, C16, C19, C44, C46, C52, C62 CAP., X5R, 220nF, 25V, 10%, 0603 AVX 06033D224KAT2A

13 1 C8 CAP., X7R, 4.7nF, 25V, 10%, 0603 AVX 06033C472KAT2A

14 2 C9, C57 CAP., NPO, 220pF, 25V, 10%, 0603 AVX 06033A221KAT2A

15 3 C13, C22, C56 CAP., X5R, 1µF, 25V, 10%, 0603 AVX 06033D105KAT2A

16 2 C14, C60 CAP., X5R, 4.7µF, 16V, 10%, 0805 TDK C2012X5R1E475K

17 4 C31,C32,C35,C36 CAP., X5R, 0.22µF, 16V, 10%, 0805 AVX 0805YC224KAT2A

18 4 D1, D2, D3, D4 DIODE, SCHOTTKY, SOD-323 CENTRAL CMDSH-3TR

19 0 Q5, Q6, Q9-Q12, Q17, Q18 OPTIONAL

20 2 Q7, Q8 MOSFET SPEED SRS 30V 30A LFPAK RENESAS RJK0305DPB

21 2 R1, R14 RES., CHIP, 20k, 1%, 0603 NIC NRC06F2002TRF

22 0 R2, R3, R5-R8, R22, R27, R31, R33, R38,

R39, R41, R42, R47, R63, R65, R68, R69,

RN1-RN8, R73, R74, R75, R76, R79, R83,

R84, R88, R89, R90, R91, R92, R93, R94,

R96, R97

RES., OPTIONAL

23 12 R4, R17, R23, R46, R48, R51, R53, R54,

R60, R61, R64, R82

RES., CHIP, 0Ω, 0603 NIC NRC06ZOTRF

24 4 R59, R66, R67, R72 RES., CHIP, 0Ω, 2512 VISHAY CRCW25120000Z0ZG

25 2 R9, R80 RES., CHIP, 3.01k, 1%, 0603 NIC NRC06F3011TRF

26 2 R10, R81 RES., CHIP, 1k, 1%, 0603 NIC NRC06F1001TRF

27 4 R11, R34, R77, R86 RES., CHIP, 3.57k, 1%, 0603 NIC NRC06F3571TRF

28 4 R12, R35, R70, R85 RES., CHIP, 715Ω, 1%, 0603 VISHAY CRCW0603715RFKEA

29 1 R13 RES., CHIP, 13.3k, 1%, 0603 VISHAY CRCW060313K3FKEA

30 8 R37, R40, R49, R52, R55, R57, R78, R101 RES., CHIP, 10k, 1%, 0603 NIC NRC06F1002TRF

31 1 R15 RES., CHIP, 2k, 1%, 0603 NIC NRC06F2001TRF

32 2 R16, R20 RES., CHIP, 10Ω, 1%, 0603 NIC NRC06F10R0TRF

33 2 R18, R62 RES., CHIP, 2.2Ω, 1%, 0603 NIC NRC06F2R20TRF

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dc2055afa

DEMO MANUAL DC2055A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

34 4 R28, R32, R87, R99 RES., CHIP, 100k, 1%, 0603 NIC NRC06F1003TRF

35 2 R43, R44 RES., CHIP, 4.99k, 1%, 0603 NIC NRC06F4K99TRF

36 1 R50 RES., CHIP, 34.8k, 1%, 0603 VISHAY CRCW060334K8FKEA

37 2 R56, R58 RES., CHIP, 0.005Ω, 1%, 2512 VISHAY WSL25125L000FEA

Hardware-For Demo Board Only

38 19 E1, E3-E8, E12-E14, E16-E19, E23, E24,

E27-E29, E33

TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

39 6 J1, J2, J3, J4, J14, J16 STUD, TESTPIN PEM KFH-032-10

40 12 J1-J4, J14, J16 (X2) NUT, BRASS 10-32 ANY #10-32

41 6 J1-J4, J14, J16 RING, LUG #10 KEYSTONE, 8205, #10

42 6 J1-J4, J14, J16 WASHER, TIN PLATED BRASS ANY #10

43 3 JP1, JP2, JP6 2MM SINGLE ROW HEADER, 4-PIN SAMTEC, TMM-104-02-L-S

44 3 JP3-JP5 HEADER 3-PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

45 6 JP1-JP6 SHUNT SAMTEC, 2SN-BK-G

46 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE SWITCHES C&K.,JS202011CQN

47 4 J7, J8, J9, J10 CONN, BNC, 5PINS CONNEX, 112404

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dc2055afa

DEMO MANUAL DC2055A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

DEG

120

DEG

GND

VIN+

VIN-

EXTVCC

DCR = 0.32m OHM

GND

744301025

IFAST1

744301025

PLLIN

DCR = 0.32m OHM

CCMBM

PGOOD1

GND

4.5V - 14V

VOUT1

TRK/SS1

VO1_SNS+

BUCK CONVERTER WITH VERY LOW DCR INDUCTOR

OFF

ENTMPB1

OFF

VO1_SNS-

RUN1

1.0V / 90A

RUN1

HAORAN W. 11-12-13

TG2

SW2

BG2

TRSET2

TG2

RUN1

PGOOD1

BG2

TRSET1

TK/SS1

ILIM1

TCOMP2

TG1

VO1_SNS-

TCOMP2TCOMP1

TRSET1

IFAST1

TG1

ENTMPB1

TAVG1

SW1

ITH1

BG1

SW1

VOUT1

TK/SS1

SW2

BG1

TCOMP1

TRSET2

TAVG1

VFB1

RUN1

EXTVCC

INTVCC1

VIN

INTVCC1

VIN

INTVCC1

VIN

INTVCC1

VIN

EXTVCC

INTVCC1

TG2

SW2

BG2

VO1_SNS-

VOUT1

TK/SS1

VFB1

TG1

RUN1

VOUT1

ITH1

SW1

VO1_SNS+

VIN

VO1_SNS+

BG1

CLKOUT1

TAVG1

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION2

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION2

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION2

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

COUT2

330uF

2.5V

7343

COUT2

330uF

2.5V

7343

JP1MODE JP1MODE

C24

OPT

C24

OPT

OPT C2

0.1uF

R38

OPT

R38

OPT

R34

3.57k

R34

3.57k

R20 10R20 10

J4J4

R12

715

R12

715

CMDSH-3

R40 10kR40 10k

C19

220nF

C19

220nF

R42

OPT

R42

OPT

0.25uH

0.1uF

C26 OPTC26 OPT

JP3JP3

BSC010NE2LSI

C18

0.1uF

C18

0.1uF

E8E8

E12E12

R39

OPT

R39

OPT

VIN

220nF

R17 0R17 0

R16 10R16 10

BSC050NE2LS

C14

4.7uF

10V

C14

4.7uF

10V

R28

100K

R28

100K

RN2

OPT

RN2

OPT

1 2

R33

OPT

R33

OPT

E14E14

SW1SW1

E7E7

R15

R32

100K

R32

100K

220nF

RN6

OPT

RN6

OPT

1 2

OPT

R23

E4E4

J2J2

COUT5

330uF

2.5V

7343

COUT5

330uF

2.5V

7343

RN1

OPT

RN1

OPT

1 2

COUT7

100uF

6.3V

1210

COUT7

100uF

6.3V

1210

E1E1

R11

3.57k

R11

3.57k

R14

20k

R14

20k

CIN18

270uF

16V

CIN18

270uF

16V

COUT6

330uF

2.5V

7343

COUT6

330uF

2.5V

7343

E3E3

COUT8

100uF

6.3V

1210

COUT8

100uF

6.3V

1210

R31

OPT

R31

OPT

C22

1uF

C22

1uF

CIN1

270uF

16V

CIN1

270uF

16V

JP2PHASMD1 JP2PHASMD1

0.25uH

220pF

C13

1uF

C13

1uF

COUT3

100uF

6.3V

1210

COUT3

100uF

6.3V

1210

R18

2.2

R18

2.2

OPT

E13E13

R35

715

R35

715

BSC010NE2LSI

E6E6

R13

13.3k

R13

13.3k

RN5

OPT

RN5

OPT

1 2

R22

OPT

R22

OPT

3.01K

20K

BSC050NE2LS

R37 10kR37 10k

CMDSH-3

R27

OPT

R27

OPT

CIN5

10uF

1210

CIN5

10uF

1210

CIN3

10uF

1210

CIN3

10uF

1210

OPT

LTC3875EUJ

TK/SS1

VOSNS1+

VOSNS1-

ITH1

ITH2

VOSNS2+

VOSNS2-

TK/SS2

SNSA2+

IFAST

ENTMPB

RUN2

BOOST2 22

BG2 23

EXTVCC 24

INTVCC 25

SNS2-

SNSD2+

TCOMP2

TAVG

TRSET2

FREQ

VIN 26

BG1 27

BOOST1 28

TG1 29

CLKOUT 31

PHASMD 32

MODE/PLLIN 33

RUN1 34

ILIM 35

TRSET1 36

TCOMP1 37

SNSD1+ 38

SNS1- 39

SGND/PGND

TG2 21

SW1 30

SNSA1+ 40

PGOOD

SW2 20

COUT1

100uF

6.3V

1210

COUT1

100uF

6.3V

1210

C23

OPT

C23

OPT

R10

CIN2

10uF

1210

CIN2

10uF

1210

C8 4.7nFC8 4.7nF

C16

220nF

C16

220nF

R43 4.99kR43 4.99k

OPT

COUT4

330uF

2.5V

7343

COUT4

330uF

2.5V

7343

R41

OPT

R41

OPT

J3J3

CIN4

10uF

1210

CIN4

10uF

1210

E5E5

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dc2055afa

DEMO MANUAL DC2055A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

DEG

120

DEG

RUN2

DCR = 0.32m OHM

744301025

IFAST2

744301025

DCR = 0.32m OHM

PGOOD2

VOUT2

VO2_SNS-

VO2_SNS+

RUN2

CLKOUT

TRK/SS2

BUCK CONVERTER WITH VERY LOW DCR INDUCTOR

GND

UP TO 30A

OFF

DUAL-OUTPUT

CONFIG L4 R86 R85

4.64k 931

0.33uF/0.32mOHM

744301033

OFF

ENTMPB2

C58R88

10k 1.5nF

R83 R84

30.1k 20k

R79 R68

00VOUT2 = 1.5V

TG4

SW4

BG4

TRSET4

TG4

PGOOD2

BG4

TRSET3

TK/SS2

ILIM2

VOUT1

TCOMP4

TG3

TCOMP4TCOMP3

TRSET3

IFAST2

CLKOUT

TG3

ITH2

SW3

ITH1

BG3

SW3

VOUT2SW4

BG3

TCOMP3

TRSET4

TAVG2

ENTMPB2

TAVG2

EXTVCC

INTVCC2

VIN

INTVCC2

VIN

INTVCC2

VIN

INTVCC2

TG4

SW4

BG4

VOUT1

TK/SS2

VFB2

TG3

RUN2

VO2_SNS-

VOUT2

VO2_SNS+

SW3

VO2_SNS+

ITH2

BG3

VO2_SNS-

ITH1

VO1_SNS-

VFB1

TK/SS1

RUN1

CLKOUT1

TAVG2

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

R92

OPT

R92

OPT

R64 0R64 0

COUT18

330uF

2.5V

7343

COUT18

330uF

2.5V

7343

R77

3.57k

R77

3.57k

R85

715

R85

715

0.25uH

R89 OPTR89 OPT

E23E23

RN4

OPT

RN4

OPT

1 2

E33E33

JP4JP4

Q13

BSC010NE2LSI

Q13

BSC010NE2LSI

C56

1uF

C56

1uF

J14J14

E27E27

C38

0.1uF

C38

0.1uF

C59

OPT

C59

OPT

R93

OPT

R93

OPT

R80

3.01K

R80

3.01K

R78 10kR78 10k

JP6

PHASMD2

JP6

PHASMD2

C57 220pFC57 220pF

R65

OPT

R65

OPT

COUT13

100uF

6.3V

1210

COUT13

100uF

6.3V

1210

CIN15

10uF

1210

CIN15

10uF

1210

Q16

BSC050NE2LS

Q16

BSC050NE2LS

LTC3875EUJ

TK/SS1

VOSNS1+

VOSNS1-

ITH1

ITH2

VOSNS2+

VOSNS2-

TK/SS2

SNSPAC2

IFAST

ENTMPB

RUN2

BOOST2 22

BG2 23

EXTVCC 24

INTVCC 25

SNSN2

SNSPDC2

TCOMP2

TAVG

TRSET2

FREQ

VIN 26

BG1 27

BOOST1 28

TG1 29

CLKOUT 31

PHASMD

MODE/PLLIN 33

RUN1 34

ILIM 35

TRSET1 36

TCOMP1 37

SNSPDC1 38

SNSN1 39

SGND/PGND

TG2 21

SW1 30

SNSPAC1 40

PGOOD

SW2 20

R96

OPT

R96

OPT

CIN14

10uF

1210

CIN14

10uF

1210

R90

OPT

R90

OPT

R88 OPTR88 OPT

R62

2.2

R62

2.2

R81

R97

OPT

R97

OPT

CMDSH-3

COUT16

330uF

2.5V

7343

COUT16

330uF

2.5V

7343

CIN16

10uF

1210

CIN16

10uF

1210

CIN13

10uF

1210

CIN13

10uF

1210

C62

220nF

C62

220nF

C48

OPT

C48

OPT

COUT20

100uF

6.3V

1210

COUT20

100uF

6.3V

1210

R94

OPT

R94

OPT

RN7

OPT

RN7

OPT

1 2

E28E28

R44 4.99kR44 4.99k R73

OPT

R73

OPT

C58

OPT

C58

OPT

R91

OPT

R91

OPT

COUT14

330uF

2.5V

7343

COUT14

330uF

2.5V

7343

CMDSH-3

R86

3.57k

R86

3.57k

C49

OPT

C49

OPT

C54

OPT

C54

OPT

C37 OPTC37 OPT

R74

OPT

R74

OPT

SW2SW2

C63

OPT

C63

OPT

R101 10kR101 10k

J16J16

C52

220nF

C52

220nF

0.25uH

R70

715

R70

715

Q15

BSC010NE2LSI

Q15

BSC010NE2LSI

R83

OPT

R83

OPT

R75

OPT

R75

OPT

C44

220nF

C44

220nF

C60

4.7uF

10V

C60

4.7uF

10V

C42

0.1uF

C42

0.1uF

R87

100K

R87

100K

R84

OPT

R84

OPT

R76

OPT

R76

OPT

Q14

BSC050NE2LS

Q14

BSC050NE2LS

R99

100K

R99

100K

RN8

OPT

RN8

OPT

1 2

C46

220nF

C46

220nF

R60 0R60 0

C43

0.1uF

C43

0.1uF

R82 0R82 0

E24E24

COUT19

100uF

6.3V

1210

COUT19

100uF

6.3V

1210

COUT17

330uF

2.5V

7343

COUT17

330uF

2.5V

7343

R68 OPTR68 OPT

R63

OPT

R63

OPT

RN3

OPT

RN3

OPT

1 2

E29E29

R79 OPTR79 OPT

C55

OPT

C55

OPT

COUT15

100uF

6.3V

1210

COUT15

100uF

6.3V

1210

R69

OPT

R69

OPT

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc2055afa

DEMO MANUAL DC2055A

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

VOUT2

IOUT2

IO2STEP_CLK

2512

1210 1210

REMOVE ZERO OHM JUMPERS FOR DUAL-OUTPUT OPERATION

OPTIONAL 5mm x 6mm Dual-MOSFETs

OPTIONAL 5.5V BIAS

OFF

BIAS

VOUT1

LOAD STEP CIRCUIT 1

IOUT1

IO1STEP_CLK

2512

1210 1210

FDMS3620S

LOAD STEP CIRCUIT 2

FDMS3620S

BUCK CONVERTER WITH VERY LOW DCR INDUCTOR

VIN

VIN EXTVCC

+5.5V

VIN

TG2

BG2

SW2

VFB1 VFB2

VO1_SNS- VO2_SNS-

ITH1 ITH2

TK/SS1 TK/SS2

RUN1 RUN2

TG1

BG1

SW1

VOUT1

VIN

VOUT2

TG4

BG4

SW4

TG3

BG3

SW3

VOUT1 VOUT2

TAVG1 TAVG2

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

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

Tuesday, November 19, 2013

HIGH EFFICIENCY HIGH CURRENT POLYPHASE SYNCHRONOUS

HAORAN W.

LTC3875EUJ

DEMO CIRCUIT 2055A

Q11

OPT

Q11

OPT

C29

100uF

6.3V

C29

100uF

6.3V

Q18

OPT

Q18

OPT

R50

34.8K

R50

34.8K

OPT

R46 0R46 0

R67

Q10

OPT

Q10

OPT

COUT11

330uF

7343

COUT11

330uF

7343

J9J9

R53 0R53 0

C31

0.22uF

C31

0.22uF

CIN7

OPT

CIN7

OPT

J7J7

C35

0.22uF

C35

0.22uF

C27

10uF

16V

C27

10uF

16V

CIN9

OPT

CIN9

OPT

COUT9

330uF

7343

COUT9

330uF

7343

CIN6

OPT

CIN6

OPT

C32

0.22uF

C32

0.22uF

COUT12

330uF

7343

COUT12

330uF

7343

CIN8

OPT

CIN8

OPT

J10J10

R54 0R54 0

CIN11

OPT

CIN11

OPT

E19

GND

E19

GND

LT1763CDE

NC 1

NC 4

OUT 3

OUT 2

ADJ 5

BYP 6

GND

SHDN

GND

C28

10uF

16V

C28

10uF

16V

COUT10

330uF

7343

COUT10

330uF

7343

RJK0305DPB

R61

J8J8

R58

0.005

R58

0.005

R72

CIN12

OPT

CIN12

OPT

C36

0.22uF

C36

0.22uF

R56

0.005

R56

0.005

C34

100uF

6.3V

C34

100uF

6.3V

Q12

OPT

Q12

OPT

E17 GND

CIN17

OPT

CIN17

OPT

E16E16

Q17

OPT

Q17

OPT

E18E18

R48 0

R52

10K

R52

10K

C30

100uF

6.3V

C30

100uF

6.3V

R49

10K

R49

10K

RJK0305DPB

OPT

JP5JP5

CIN10

OPT

CIN10

OPT

R66

R57

10K

R57

10K

C33

100uF

6.3V

C33

100uF

6.3V

R59

R47

OPT

R47

OPT

R55

10K

R55

10K

R51 0R51 0

dc2055afa

DEMO MANUAL DC2055A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0316 REV A • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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