Linear Technology DC2378A-B User manual

dc2378abfa

DEMO MANUAL DC2378A-B

Description

LTM4650-1

High Efficiency, Single 50A or Dual 25A

Step-Down Power µModule Regulator

Demonstration circuit DC2378A-B features the

LT M

4650EY-1, the high efficiency, high density, dual

25A, single 50A, switch mode step-down power module

regulator. The input voltage isfrom4.5Vto15V. The output

voltage is programmable from 0.6V to 1.8V. DC2378A-B

can deliver 25A maximum current from each channel. As

explained in the data sheet, output current derating is nec-

essary for certain VIN, VOUT, and thermal conditions. The

board operates in continuous conduction mode in heavy

loadconditions. For highefficiency atlowloadcurrents, the

MODE jumper(JP1) selects pulse-skipping mode for noise

sensitive applications or Burst Mode

operation in less

noisesensitiveapplications. Tw o outputs can be connected

in parallel for a single 50A output solution with optional

jumper resistors. The board allows the user to program 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.

how its output ramps up and down through the TRACK/

SS pin. The output can be set up to either coincidentally or

ratiometrically track with another supply’s output. Remote

output voltage sensing is available for improved output

voltage regulation at the load point. These features and

the availability of the LTM4650EY-1 in a compact 15mm

×15mm × 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 DC2378A-B.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2378A-B

Figure 1. LTM4650-1/DC2378A-B Demo Board

dc2378abfa

DEMO MANUAL DC2378A-B

Quick start proceDure

Demonstration circuit DC2378A-B is easy to set up to

evaluate the performance of the LTM4650EY-1. Please

refer to Figure 2 for proper measurement setup and follow

the procedure below:

1. Place jumpers in the following positions for a typical

application:

JP1 JP2 JP3 JP4 JP5

MODE RUN1 RUN2 TRACK1

SEL.

TRACK2

SEL.

CCM ON ON SOFT-

START

SOFT-

START

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. The output

voltage in channel 1 should be 1.5V±1.5% (1.4775V

~ 1.5225V) and the output voltage in channel 2 should

be 1V ±1.5% (0.985V ~ 1.015V).

4. Oncetheproperoutputvoltageisestablished,adjustthe

load within the operating range and observe the output

voltage regulation, output voltage ripple, efﬁciency and

other parameters. Output ripple should be measured

at J1 and J2 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 current amplitude. The output transient current

can be monitored at the BNC connector J3 (10mV/A).

The pulse signal should have very small duty cycle (<

1%) to limit the thermal stress on the transient load

circuit. Switch the jumper resistors R34 or R35 (on the

backside of boards) to apply load transient on channel

1 or channel 2 correspondingly.

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

external clock signal. Place the JP1 jumper on EXT_CLK

and apply a clock signal (0V~ 5V, square wave) on the

CLKIN test point.

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

supply. The jumpers JP4 and JP5 allow choosing soft-

start or output tracking. If tracking external voltage is

selected, the corresponding test points, TRACK1 and

TRACK2, need to be connected to a valid voltage signal.

8. (Optional) LTM4650-1 can be conﬁgured for a 2-phase

single output at up to 50A on DC2378A-B. Install 0Ω

resistors on R14, R17, R28, R39, R43, R44, R45 and

remove R7, R19. Output voltage is set by R25 based

on equation VOUT = 0.6V(1 + 60.4k/R25).

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 4.5 15 V

Output Voltage VOUT1 VIN = 4.5V ~ 15V, IOUT1 = 0A ~ 25A, JP1: CCM 1.5 ±1.5% V

Output Voltage VOUT2 VIN = 4.5V ~ 15V, IOUT2 = 0A ~ 25A, JP1: CCM 1 ±1.5% V

Per-Channel Maximum Continuous Output

Current

Derating Is Necessary for Certain VIN, VOUT and

Thermal Conditions, See Data Sheet for Detail.

(Per-Channel)

Default Operating Frequency 500 kHz

Resistor Programmable Frequency Range 250 780 kHz

External Clock Sync. Frequency Range 400 780 kHz

Efficiency of Channel 1 VIN = 12V, VOUT1 = 1.5V, IOUT1 = 25A, fSW = 500kHz 88.8

See Figure 4

Efficiency of Channel 2 VIN = 12V, VOUT2 = 1V, IOUT2 = 25A, fSW = 500kHz 86.5

See Figure 5

Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISTEP = 12.5A ~ 18.75A See Figure 6

Load Transient of Channel 2 VIN = 12V, VOUT2 = 1V, ISTEP = 12.5A ~ 18.75A See Figure 7

dc2378abfa

DEMO MANUAL DC2378A-B

Quick start proceDure

Figure 3. Measuring Output Voltage Ripple

Figure 2. Test Setup of DC2378A-B

+ –

VOUT GND

COUT

dc2378abfa

DEMO MANUAL DC2378A-B

Quick start proceDure

Figure 4. Measured Efficiency on Channel 1

(VOUT1 = 1.5V, fSW = 500kHz, Channel 2 Disabled)

Figure 6. Measured Channel 1 12.5A to 18.75A Load Transient

(VIN = 12V, VOUT1 = 1.5V)

Figure 5. Measured Efficiency on Channel 2

(VOUT2 = 1V, fSW = 500kHz, Channel 1 Disabled)

Figure 7. Measured Channel 2 12.5A to 18.75A Load Transient

(VIN = 12V, VOUT2 = 1V)

OUTPUT LOAD CURRENT (A)

EFFICIENCY (%)

70 15

dc2378aa F04

20105

12VIN, 1.5VO

5VIN, 1.5VO

OUTPUT LOAD CURRENT (A)

EFFICIENCY (%)

70 15

dc2378aa F05

20105

12VIN, 1VO

5VIN, 1VO

dc2378aa F06

12.5A TO 18.75A

1.5V OUTPUT (20MHz BW) [20mV/DIV]

dc2378aa F07

12.5A TO 18.75A

1V OUTPUT (20MHz BW) [20mV/DIV]

dc2378abfa

DEMO MANUAL DC2378A-B

Quick start proceDure

Figure 8. Measured Output Voltage Ripple at 12V Input,

1.5V/25A with Standard Demo Circuit Default Setup

Figure 10. Thermal Capture at 12VIN, 1.5VOUT at 25A and 1VOUT at 25A

(Ambient Temperature = 23°C, 200 LFM Airflow and No Heat Sink)

Figure 9. Measured Output Voltage Ripple at 12V Input,

1V/25A with Standard Demo Circuit Default Setup

dc2378aa F08

1.5V OUTPUT (20MHz BW) [20mV/DIV]

dc2378aa F09

1V OUTPUT (20MHz BW) [20mV/DIV]

dc2378abfa

DEMO MANUAL DC2378A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., ALUM. ELECT.,330µF, 25V, 20% PANASONIC, 25SVPF330M

2 4 CIN2, CIN3, CIN4, CIN5 CAP., 22µF,X5R, 25V, 10%,1210 MURATA, GRM32ER61E226KE15L

3 4 COUT9, COUT10, COUT12, COUT18 CAP., POSCAP, 470µF, 2.5V, 0.005Ω, 7343 PANASONIC, ETPF470M5H

4 10 COUT2, COUT3, COUT4, COUT5, COUT6 CAP., 100µF, X5R, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

COUT8, COUT13, COUT14, COUT15,

COUT16

5 1 C1 CAP., 4.7µF, X5R, 16V,20%, 0805 KEMET, C0805C475M4PACTU

6 1 C2 CAP., 1µF,X7R, 25V,10%, 0805 AVX, 08053C105KAT2A

7 2 C5, C7 CAP., 0.1µF, X5R, 25V, 10%, 0603 AVX, 06033D104KAT2A

8 1 C10 CAP., 220pF, X7R, 100V,10%, 0603 AVX, 06031C221KAT2A

9 1 C12 CAP., 47pF, X7R, 50V,10%, 0603 AVX, 06035A470J4T2A

10 4 C13, C14, C15, C16 CAP., 1µF, X7R, 10V,10%, 0603 AVX, 0603ZC105KAT2A

11 1 C17 CAP., 3.3nF, X7R, 50V,10%, 0603 AVX, 06035C332KAT2A

12 1 C18 CAP., 4.7nF, X7R, 50V,10%, 0603 AVX, 06035C472KAT2A

13 1 Q1 XSTR., N-CH, 40V, DPAK-2, TO-252 VISHAY, SUD50N04-8M8P-4GE3

14 4 R1, R3, R22, R26 RES., 10 OHMS, 1/10W, 1%, 0603 NIC, NRC06F10R0TRF

15 1 R5 RES., 100k, 1/10W, 1%, 0603 VISHAY,CRCW0603100KFKEA

16 4 R9, R12, R15, R18 RES.., 60.4k, 1/10W,1%, 0603 VISHAY, CRCW060360K4FKEA

17 2 R10, R13 RES.., 6.04k, 1/10W,1%, 0603 VISHAY, CRCW06036K04FKEA

18 1 R19 RES., 90.9k, 1/10W,1%, 0603 VISHAY, CRCW060390K9FKEA

19 3 R24, R27, R36 RES., 10k, 1/10W,1%, 0603 YAGEO, RC0603FR-0710KL

20 1 R25 RES., 40.2k, 1/10W,1%, 0603 VISHAY,CRCW060340K2FKEDA

21 1 R30 RES., 121k, 1/10W,1%, 0603 VISHAY,CRCW0603121KFKEA

22 1 R37 RES., HIGH POWER, 0.01Ω, 2W,1%, 2512 VISHAY, WSL2512R0100FEA18

23 1 R46 RES., 21k, 1/10W,1%, 0603 YAGEO, RC0603FR-0721KL

24 1 R47 RES., 20k, 1/10W,1%, 0603 YAGEO, RC0603FR-0720KL

25 1 U1 I.C., 16X16X5.01-BGA LINEAR TECH., LTM4650EY-1#PBF

Additional Demo Board Circuit Components

1 0 COUT1, COUT7, COUT11, COUT17 CAP., OPT, 7343 OPT

2 0 C3, C4, C6, C8, C9, C11 CAP., OPTION, 0603 OPT

3 0 R2, R4, R6, R8, R11, R14, R16, R17,

R20, R23, R28, R31, R33, R39, R40,

R41, R42, R48

RES., OPTION, 0603 OPT

4 4 R7, R21, R29, R32 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

5 1 R34 RES., 0Ω, 1/2W, 2010 VISHAY, CRCW20100000Z0EF

6 0 R35 RES., OPTION, 2010 OPT

7 0 R38, R43, R44, R45 RES., OPTION, 2512 OPT

Hardware: For Demo Board Only

1 16 E1, E3, E4, E5, E6, E7, E8, E9, E10, E12,

E13, E14, E15, E16, E17, E18

TEST POINT, TURRET, .094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 CONN., HEADER, 2×4, 2mm WURTH ELEKTRONIK, 62000821121

3 3 JP2, JP3, JP4 CONN., HEADER, 1×3, 2mm WURTH ELEKTRONIK, 62000311121

dc2378abfa

DEMO MANUAL DC2378A-B

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

4 1 JP5 CONN., HEADER, 2×3, 2mm WURTH ELEKTRONIK, 62000621121

5 5 XJP1, XJP2, XJP3, XJP4, XJP5 SHUNT, 2mm WURTH ELEKTRONIK, 60800213421

6 3 J1, J2, J3 CONN., BNC STR PCB JK, THRU- HOLE, 5 PINS CONNEX 112404

7 2 J4, J5 CONN., JACK, BANANA, NON-INSULATED, 0.218" KEYSTONE, 575-4

8 4 J6, J7, J8, J9 STUD, TESTPIN PEM KFH-032-10

9 8 J6, J7, J8, J9 (×2) NUT, BRASS 10-32 ANY #10-32

10 4 J6, J7, J8, J9 RING, LUG #10 KEYSTONE, 8205, #10

11 4 J6, J7, J8, J9 WASHER, TIN PLATED BRASS ANY #10, #10EXT BZ TN

12 4 (STAND-OFF) STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833

dc2378abfa

DEMO MANUAL DC2378A-B

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

VIN+

VIN-

VIN

GND

4.5V-15V

VO1+

VO1-

VO2-

VO2+

TRACK1

EXT.

SOFT-START

TRACK1 SEL.

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603.

SW2

SW1

VOUT1

VIN INTVCC

VO1+

VO1-

INTVCC

VO1-

VO1+

INTVCC

VOUT1

VO2+

VO2-

VIN

INTVCC

DIFFP

COMP1

VFB1

DIFFN

DIFFOUT

VOUT1S

VOUT1

TRACK1

RUN1

VO2+

VOUT2

VO2-

VOUT2S

RUN2

TRACK2

VFB2

COMP2

INTVCCTEMP

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 4-26-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 4-26-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION

1 4-26-16

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

COUT14

100uF

6.3V

1210

R16

OPT

JP3

OFF

RUN2

E15

TEMP

COUT13

100uF

6.3V

C10

220pF

R19

90.9K

0.1uF

CIN4

22uF

1210

25V

COUT2

100uF

6.3V

COUT6

100uF

6.3V

1210

COUT1

OPT

2.5V

OPT

R10

6.04K

JP1

EXT_CLK

CCM

MODE

7 8

1.5V / 25A

VOUT1

R30

121K

LTM4650EY-1

VIN J9

VIN J10

VIN J11

VIN K2

VIN K3

VIN K4

VIN K9

VIN K10

VIN K11

VIN

M10

VIN

M11

VIN L2

VIN L3

VIN L4

VIN L5

VIN L6

VIN L7

VIN L8

VIN L9

VIN

L10

VIN

L11

VIN J2

VIN J3

VIN J4

RUN1

TRACK1

VOUT1S

VOUT1

VFB1

SW1

PGOOD1

COMP1

DIFFOUT

DIFFN

DIFFP

FSET

PHASMD

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

GND H3

GND H4

GND H5

GND H6

GND H7

GND H9

GND H10

GND H11

GND H12

GND J1

GND J5

GND J8

GND J12

GND K1

GND K5

GND K6

GND K7

GND K8

GND K12

GND L1

GND L12

GND M1

GND M12

SGND C7

SGND D6

SGND F6

SGND F7

SGND G6

SGND G7

VOUT1

COMP2 E7

PGOOD2 G8

SW2 G11

VFB2 D7

TRACK2 D8

RUN2 F9

VOUT2S C8

TEMP J6

MODE-PLLIN F4

CLKOUT G5

INTVCC H8

EXTVCC J7

VOUT2 A8

VOUT2 A9

VOUT2 A10

VOUT2 A11

VOUT2 A12

VOUT2 B8

VOUT2 B9

VOUT2 B10

VOUT2 B11

VOUT2 B12

VOUT2 C9

VOUT2 C10

VOUT2 C11

VOUT2 C12

GND

JP5

VOUT1

TRACK2 SEL.

5 6

0.1uF

R46

21K

E12 PGOOD2

E13

EXTVCC

CIN3

22uF

25V

1210

R15

60.4K

R32

COUT16

100uF

6.3V

OPT

COUT17

OPT

7343

COUT18

470uF

2.5V

7343

COUT10

470uF

2.5V

7343

R42

OPT

CIN2

22uF

25V

1210

R21

COUT4

100uF

6.3V

1210

E14

CLKOUT

4.7uF

R22

COUT15

100uF

6.3V

1210

1uF

R47

20K

R20

OPT

R41

OPT

R24

10K

C12

47pF

GND

R27

10K

COUT7

OPT

7343

CIN5

22uF

25V

1210

JP2

OFF

RUN1

1 3

100K

OPT

C11

OPT

COUT8

100uF

6.3V

R18

60.4K

E10

TRACK2

COUT12

470uF

2.5V

7343

60.4K

CIN1

330uF

25V

C17

3.3nF

R12

60.4K

OPT

PGOOD1

OPT

R26

COUT11

OPT

2.5V

JP4

SOFT-START

TRACK

COUT5

100uF

6.3V

1210

R13

6.04K

C18

4.7nF

GND

E16

CLKIN

R29

1V / 25A

VOUT2

R25

40.2K

COUT3

100uF

6.3V

1210

COUT9

470uF

2.5V

7343

OPT

dc2378abfa

DEMO MANUAL DC2378A-B

schematic Diagram

D D

C C

B B

A A

OPTIONAL JUMPER FOR SINGLE OUTPUT CONFIGURATION

DIFF SENSING SELECTION

VOUT1

Load Transient Circuit

VOUT2

VIN

TEMP INTVCC

RUN1 RUN2

TRACK1 TRACK2

VFB1 VFB2

COMP1 COMP2

VO2- DIFFN

VO2+ DIFFP

VOUT1S VOUT1

VOUT2S DIFFOUT

VOUT1 VOUT2

INTVCC

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

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, April 26, 2016

STEP-DOWN MODULE REGULATOR

N/A

LTM4650EY-1

DEMO CIRCUIT 2378A-B

HIGH EFFICIENCY, DUAL 25A, SINGLE 50A,

R36

10K

E17

IOSTEP CLK

IOSTEP

R23

OPT

R39

OPT C13

1uF

R35

OPT

2010

SUD50N04-8M8P-4GE3

R14

OPT

R48

OPT

J1 C14

1uF

R11

OPT

E18

GND

R34

0 OHm

0.5W

2010

R43

OPT

2512

R28

OPT

R45

OPT

2512

R38

OPT

2512

R33

OPT

R17

OPT C16

1uF

R44

OPT 2512

R40

OPT

C15

1uF

R31

OPT

R37

0.010

2512

dc2378abfa

DEMO MANUAL DC2378A-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0317 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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