Linear Technology DC2147A Quick setup guide

dc2147af

DEMO MANUAL DC2147A

Description

LTM4631

Ultrathin Dual 10A or Single 20A

DC/DC µModule Regulator

Demonstration circuit 2147A features the LT M

4631,

the high efficiency, high density, dual 10A, switch mode

step-down µModule

power module regulator. The input

voltage is from 4.5V to 15V. The output voltage is pro-

grammable from 0.6V to 1.8V. DC2147A can deliver up to

10A maximum in each channel. As explained in the data

sheet, output current derating is necessary for certain

VIN, VOUT, and thermal conditions. The board operates in

continuous conduction mode in heavy load conditions.

For high efficiency at low load currents, the MODE jumper

(JP1) selects pulse-skipping mode for noise sensitive ap-

plications or Burst Mode

operation in less noise sensitive

applications. Two outputs can be connected in parallel for

a single 20A output solution with optional jumper resis-

tors. The board allows the user to program how its output

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

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

respective owners.

ramps up and down through the TRACK/SS pin. The output

can be set up to either coincidentally or ratio-metrically

track with another supply’s output. Remote output voltage

sensing is available for improved output voltage regula-

tion at the load point. These features and the availability

of the LTM4631 in a compact 16mm × 16mm × 1.91mm

LGA package make it ideal for use in many high density

point-of-load regulation applications. The LTM4631 data

sheet must be read in conjunction with this demo manual

for working on or modifying the demo circuit DC2147A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2147A

BoarD photo

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dc2147af

DEMO MANUAL DC2147A

Quick start proceDure

Demonstration circuit 2147A is easy to set up to evalu-

ate the performance of the LTM4631EV. Please refer to

Figure 1 for proper measurement setup and follow the

procedure below:

1. Place jumpers in the following positions for a typi-

cal application:

JP1 JP2 JP3 JP4 JP5 JP6

MODE RUN1 RUN2 TRACK1

SELECT

TRACK2

SELECT

CLKOUT

PHASE

CCM ON ON SOFT-

START

SOFT-

START

90°

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 to 12V.

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

voltage in channel 1 should be 1.2V ± 1.5% (1.182V

~ 1.218V) and the output voltage in channel 2 should

be 1V ± 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, ef-

ficiency 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.

performance summary

Specifications are at TA= 25°C

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4.5V ~ 15V

Output Voltage VOUT1 VIN = 4.5V ~ 15V, IOUT1 = 0A ~ 10A, JP1: CCM 1.2V ± 1.5% (1.182V ~ 1.218V)

Output Voltage VOUT2 VIN = 4.5V ~ 15V, IOUT2 = 0A ~ 10A, JP1: CCM 1V ± 1.5% (0.985V ~ 1.015V)

Per-Channel Maximum Continuous Output

Current

Derating Is Necessary for Certain VIN, VOUT and Thermal

Conditions, See Data Sheet for Detail.

10A

Default Operating Frequency 650kHz

Resistor Programmable Frequency Range 250kHz to 780kHz

External Clock Sync Frequency Range 400kHz to 780kHz

Efficiency of Channel 1 VIN = 12V, VOUT1 = 1.2V, IOUT1 = 10A, fSW = 650kHz 81.5% See Figure 2

Efficiency of Channel 2 VIN = 12V, VOUT2 = 1V, IOUT2 = 10A, fSW = 650kHz 78.7% See Figure 3

Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.2V, ISTEP = 5A ~ 10A See Figure 4

Load Transient of Channel 2 VIN = 12V, VOUT2 = 1V, ISTEP = 5A ~ 10A See Figure 5

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dc2147af

DEMO MANUAL DC2147A

Quick start proceDure

Figure 1. Test Setup of DC2147A

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

adjustable pulse signal between IOSTEP CLK and

GND test point. Pulse amplitude sets the load step

current amplitude. The output transient current can

be monitored at the BNC connector J3 (50mV/A).

The pulse signal should have very small duty cycle

(< 10%) 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) LTM4631 can be synchronized to an exter-

nal 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 LTM4631 can track another

supply.ThejumpersJP4andJP5allowchoosingsoft-

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) LTM4631 can be configured for a 2-phase

single output at up to 20A on DC2147A. Install 0Ω

resistors on R14, R17, R28, R39 and remove R7,

R19. Output voltage is set by R25 based on equation

VOUT = 0.6V(1+60.4K/R25).

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dc2147af

DEMO MANUAL DC2147A

Quick start proceDure

Figure 2. Measured Efficiency on Channel 1

(VOUT1 = 1.2V, fSW = 650kHz, Channel 2 Disabled)

Figure 3. Measured Efficiency on Channel 2

(VOUT2 = 1V, fSW = 650kHz, Channel 1 Disabled)

OUTPUT CURRENT (A)

EFFICIENCY (%)

60 6 8

dc2147a F02

2 4

EFFICIENCY

VIN = 12V

VOUT = 1.2V

fSW = 650kHz

OUTPUT CURRENT (A)

EFFICIENCY (%)

60 6 8

dc2147a F03

2 4

EFFICIENCY

VIN = 12V

VOUT = 1V

fSW = 650kHz

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dc2147af

DEMO MANUAL DC2147A

Quick start proceDure

Figure 4. Measured Channel 1 5A to 10A Load Transient

(VIN = 12V,VOUT1 = 1.2V)

Figure 5. Measured Channel 2 5A to 10A Load Transient

(VIN = 12V,VOUT2 = 1V)

1.2V OUTPUT [50mV/DIV]

5A TO 10A LOAD STEP [4A/DIV]

1V OUTPUT [50mV/DIV]

5A TO 10A LOAD STEP [4A/DIV]

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dc2147af

DEMO MANUAL DC2147A

Figure 6. Thermal Capture at 12VIN, 1.2VOUT1 at 10A and 1VOUT2 at 10A

(TA= 25°C, No Forced Airflow and No Heat Sink)

Figure 7. Thermal Capture at 12VIN, 1.2VOUT1 at 10A and 1VOUT2 at 10A

(TA= 25°C, 200LFM Airflow and No Heat Sink)

Quick start proceDure

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dc2147af

DEMO MANUAL DC2147A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP, 150µF, 25V, ALUMINUM ELECTR SUN ELECT, 25CE150AX

2 2 CIN2, CIN3 CAP, X5R, 22µF, 25V, 20%, 1206 TDK, C3216X5R1E226M160AB

3 2 COUT1, COUT5 CAP, X5R, 100µF, 4V, 20%, 1206 TDK, C3216X5R0G107M160AB

4 2 COUT2, COUT6 CAP, 470µF, 2.5V, POSCAP, F8, 7343 SANYO, 2R5TPE470M9

5 1 C2 CAP, X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A

6 2 C5, C7 CAP, X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A

7 2 C13, C14 CAP, X7R, 0.01µF, 50V, 10%, 0603 AVX, 06035C103KAT2A

8 2 C15, C16 CAP, X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A

9 1 Q1 XSTR,SUD50N04-8M8P-4GE3, MOSFET, TO252 VISHAY, SUD50N04-8M8P-4GE3

10 4 R1, R3, R22, R26 RES, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA

11 1 R5 RES, 121k, 1%, 0603 VISHAY,CRCW0603121KFKEA

12 5 R9, R12, R15, R18, R25 RES, 60.4k, 1%, 0603 VISHAY, CRCW060360K4FKEA

13 2 R10, R13 RES, 6.04k, 1%, 0603 VISHAY, CRCW06036K04FKEA

14 1 R19 RES, 90.9k, 1%, 0603 VISHAY, CRCW060390K9FKEA

15 3 R24, R27, R36 RES, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA

16 1 R30 RES, 154k, 1%, 0603 VISHAY,CRCW0603154KFKEA

17 1 R37 RES, 0.05Ω, 1W, 2512 VISHAY, WSL2512R0050FEA

18 1 U1 LTM4631EV#PBF, 16X16X4.41-LGA LINEAR TECHNOLOGY, LTM4631EV#PBF

Additional Demo Board Circuit Components

1 0 COUT3, COUT7 OPT, 1206 OPT

2 0 COUT4, COUT8 OPT, 7343 OPT

3 0 C1 OPT, 0805 OPT

4 0 C3, C4, C6, C8 TO C12, C17, C18 OPT, 0603 OPT

5 0 R2, R4, R6, R8, R11, R14, R16,

R17, R20, R23, R28, R31, R33,

R39, R40, R41, R42

OPT, 0603 OPT

6 4 R7, R21, R29, R32 RES, 0, 1%, 0603 VISHAY, CRCW06030000Z0EA

7 1 R34 RES, 0Ω, 0.5W, 2010 VISHAY, CRCW20100000Z0EF

8 0 R35 OPT, 2010 OPT

9 0 R38 OPT, 2512 OPT

Hardware: For Demo Board Only

1 16 E1, E3 TO E10, E12 TO E18 TESTPOINT, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 1 JP1 HEADER, 2X4 0.079 DOUBLE ROW SULLINS, NRPN042PAEN-RC

3 3 JP2, JP3, JP4 HEADER, 1X3 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC

4 1 JP5 HEADER, 2X3 0.079 DOUBLE ROW SULLINS, NRPN032PAEN-RC

5 1 JP6 HEADER, 1X4 0.079 SINGLE ROW SULLINS, NRPN041PAEN-RC

6 6 XJP1 TO XJP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

7 3 J1, J2, J3 CONN, BNC, 5 PINS CONNEX 112404

8 6 J4 TO J9 JACK BANANA KEYSTONE, 575-4

9 4 (STAND-OFF) STAND-OFF, NYLON 0.50" KEYSTONE, 8833(SNAP ON)

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dc2147af

DEMO MANUAL DC2147A

schematic Diagram

D D

C C

B B

A A

VIN+

VIN-

VIN

GND

4.5V - 15V

VOUT1

GND

VO1+

VO1-

1.2V / 10A

1V / 10A

GND

VO2-

VO2+

VOUT2

TRACK1

CLKOUT

PHASE

120

EXT.

SOFT-START

TRACK1 SEL.

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE 0603.

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

INTVCC

TEMP

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

YL.

PRODUCTION

1 01-13-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

YL.

PRODUCTION

1 01-13-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

YL.

PRODUCTION

1 01-13-16

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

R16

OPT

JP3

OFF

RUN2

E15

TEMP

COUT3

OPT

1206

C10

OPT

R19

90.9K

0.1uF

C18

OPT

CIN2

22uF

1206

25V

COUT7

OPT

1206

COUT4

OPT

2.5V

OPT

R10

6.04K

JP1

EXT_CLK

CCM

MODE

7 8

R30

154K

LTM4631EV

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

VOUTS1

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

VOUTS2 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

COUT2

470uF

2.5V

0.1uF

E12 PGOOD2

E13

EXTVCC

R15

60.4K

R32

OPT

R41

OPT

E6 R21

COUT1

100uF

6.3V

1206

E14

CLKOUT

OPT

0805

R22

1uF

0805

R20

OPT

R24

10K

C12

OPT

JP5

TRACK2 SEL.

VOUT1

5 6

R27

10K

COUT8

OPT

2.5V

CIN3

22uF

25V

1206

JP2

OFF

RUN1

1 3

121K

OPT

C11

OPT

JP6

R18

60.4K

E10 TRACK2

60.4K

COUT6

470uF

2.5V

CIN1

150uF

25V

TP1

SW1

R12

60.4K

OPT

PGOOD1

OPT

R26

JP4

SOFT-START

TRACK

COUT5

100uF

1206

R42

OPT

R13

6.04K

C17

OPT

E16

CLKIN

R29

TP2 SW2

R25

60.4K

OPT

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dc2147af

DEMO MANUAL DC2147A

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

OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION

DIFF SENSING SELECTION

VOUT1

LOAD TRANSIENT CIRCUIT

VOUT2

TEMP INTVCC

RUN1 RUN2

TRACK1 TRACK2

VFB1 VFB2

COMP1 COMP2

VO2- DIFFN

VO2+ DIFFP

VOUT1S VOUT1

VOUT2S DIFFOUT

VOUT1 VOUT2

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

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

Wednesday, January 13, 2016

STEP-DOWN MODULE REGULATOR

YL.

N/A

LTM4631EV

DEMO CIRCUIT 2147A

HIGH EFFICIENCY, ULTRATHIN DUAL 10A

E17

IOSTEP CLK

R36

10K

R39

OPT

R23

OPT

IOSTEP

SUD50N04-8M8P

R35

OPT

2010

C13

0.01uF

R14

OPT

R11

OPT

C14

0.01uF

E18

GND

R34

0 OHm

0.5W

2010

R28

OPT

R38

OPT

2512

R33

OPT

R40

OPT

C16

1uF

R17

OPT

R37

0.05

2512

R31

OPT

C15

1uF

dc2147af

DEMO MANUAL DC2147A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0616 • 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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