Linear Technology LTC3864 Quick setup guide

dc1722afa

DEMO MANUAL DC1722A

DESCRIPTION

LTC3864

55V Low IQStep-Down

DC/DC Converter with

100% Duty Cycle Capability

Demonstration circuit 1722A is a high voltage, current

modeDC/DCstep-downconverterfeaturingtheLT C

3864.

The board operates from an input range of 3.5V to 55V,

and provides a 5V, 2A output when the input exceeds 5V.

The PMOSFET architecture allows it to operate seamlessly

up to 100% duty cycle, and function as a saturated switch

below the regulation threshold, down to 3.5VIN. It operates

at 350kHz and may be synchronized to an external clock.

A soft-start feature controls output voltage slew rate at

start-up, reducing current surge and voltage overshoot.

Burst Mode

operation that improves efficiency at light

loads can be enabled with a jumper. A power good output

signal is provided. The demonstration board has options

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

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

owners.

PERFORMANCE SUMMARY

for larger MOSFET and diode packages on the back of the

board for higher output current requirements.

This board is suitable for a wide range of automotive,

telecom, industrial, and other applications. The LTC3864

is available in small 12-pin thermally enhanced MSOP and

DFN packages. For other output requirements, see the

LTC3864 data sheet or contact the LT C factory.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1722A

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 3.5 55 V

VOUT Output Voltage 5.0 V

IOUT Output Current Range, Continuous 0 2 A

fSW Switching (Clock) Frequency 350 kHz

VOUT(P-P) Output Ripple VIN = 14V, IOUT = 2A (20MHz BW) 15 mVP–P

VREG Output Regulation Line and Load (5.5VIN to 55VIN, 0AOUT to 2AOUT) 0.23 %

POUT/PIN Efficiency (See Figure 3) VIN =14V, IOUT = 2A 84 %

Approximate Size Component Area x Top Component Height 0.6 × 0.6 × 0.14 Inches

Specifications are at TA= 25°C

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DEMO MANUAL DC1722A

QUICK START PROCEDURE

Demonstration circuit 1722 is easy to set up to evaluate

the performance of the LTC3864. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

NOTE:Whenmeasuringtheoutputvoltage ripple, caremust

be taken to avoid a long ground lead on the oscilloscope

probe. Measure the output voltage ripple by touching the

probe tip and ground ring directly across the last output

capacitor as shown in Figure 1.

1. Set an input power supply that is capable of 3.5V to

55V to 6V. Then turn off the supply.

2. Withpoweroff, connect the supply to the input terminals

VIN and GND.

a. Input voltages lower than 3.5Vcan keep the converter

from turning on due to the undervoltage lockout

feature of the LTC3864.

b. If efficiency measurements are desired, an ammeter

capable of measuring 2ADC or a resistor shunt can

be put in series with the input supply in order to

measure the DC1722A’s input current.

c. A voltmeter with a capability of measuring at least

55V can be placed across the input terminals in order

to get an accurate input voltage measurement.

3. Turn on the power at the input.

NOTE: Make sure that the input voltage never exceeds 55V.

4. Check for the proper output voltage of 5V. Turn off the

power at the input.

5. Once the proper output voltage is established, connect

a variable load capable of sinking 2A at 5V to the output

terminals VOUT and GND. Set the current for 0A.

a. If efficiency measurements are desired, an ammeter

or a resistor shunt that is capable of handling 2ADC

can be put in series with the output load in order to

measure the DC1722A’s output current.

b. A voltmeter with a capability of measuring at least 5V

can be placed across the output terminals in order

to get an accurate output voltage measurement.

6. Turn on the power at the input.

NOTE: If there is no output, temporarily disconnect

the load to make sure that the load is not set too high.

7. Once the proper output voltage is again established,

adjust the load and/or input within the operating range

and observe the output voltage regulation, ripple volt-

age, efficiency and other desired parameters.

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dc1722afa

DEMO MANUAL DC1722A

Figure 1. Proper Measurement Equipment Setup

QUICK START PROCEDURE

DC1722a F01

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dc1722afa

DEMO MANUAL DC1722A

QUICK START PROCEDURE

Figure 2. Efficiency with Burst Mode Operation at Light Loads

Figure 3. Output Ripple at 14VIN and 2AOUT (10mV, 2µs/DIV, 20MHz)

IOUT (A)

EFFICIENCY (%)

DC1722a F02

0.01 1 100.1

VIN = 6V

VIN = 14V

VIN = 28V

VIN = 55V

DC1722a F03

2µs/DIV

10mV/DIV

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dc1722afa

DEMO MANUAL DC1722A

QUICK START PROCEDURE

Figure 4. Transient Response Waveform at 14VIN and 1A - 2A - 1AOUT (1A, 50mV,100µs/DIV)

DC1722a F04

100µs/DIV

1A/DIV

50mV/DIV

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DEMO MANUAL DC1722A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP, 10μF 20% 63V ALUM SUN ELEC. 63HEH10M

2 1 CIN2 CAP, 1210 2.2μF 10% 100V X7R MURATA GRM32ER72A225KA35L

3 2 COUT1, COUT2 CAP, 1812 100μF 20% 6.3V X5R TDK C4532X5R0J107M

4 1 COUT3 CAP, 0603 1μF 10% 6.3V X5R TAIYO YUDEN JMK107BJ105KA-T

5 1 C1 CAP, 0402 100pF 5% 25V NPO AVX 04023A101JAT2A

6 1 C2 CAP, 0402 2200pF 10% 25V X7R AVX 04023C222KAT2A

7 1 C4 CAP, 0402 47pF 5% 25V NPO AVX 04023A470JAT2A

8 1 C5 CAP, 0603 0.47μF 20% 16V X7R AVX 0603YC474MAT2A

9 1 C6 CAP, 0402 0.1μF 20% 16V X5R AVX 0402YD104MAT2A

10 1 C7 CAP, 0805 0.1μF 20% 100V X5R TDK C2012X5R2A104M

11 1 C8 CAP, 0402 220pF 5% 25V NPO AVX 04023A221JAT2A

12 1 D1 DIODE, SUPER BARRIER RECTIFIER 100V DFN3030-8 DIODES INC./ZETEX SBR3U100LP-7

13 1 L1 IND, 10μH COILCRAFT XAL5050-103ME

14 1 Q1 XSTR, FET P-CHANNEL 60V FAIRCHILD SEMI FDMC5614P

15 5 R1, R4, R6, R8, R10 RES, 0402 0Ω JUMPER VISHAY CRCW04020000Z0ED

16 1 R2 RES, 0402 10k 1% 1/16W VISHAY CRCW040210K0FKED

17 1 R3 RES, 0402 80.6k 1% 1/16W VISHAY CRCW040280K6FKED

18 1 R5 RES, 0402 422k 1% 1/16W VISHAY CRW0402422KFKED

19 1 R7 RES, 2010 0.025Ω 1% 1/2W VISHAY WSL2010R0250FEA

20 1 R9 RES, 0402 100k 5% 1/16W VISHAY CRCW0402100KJNED

21 1 U1 IC, VOLTAGE REG. MSOP(12)-MSE LINEAR TECH. LTC3864EMSE

Additional Demo Board Circuit Components

1 0 CIN3 CAP, 1210 2.2μF 10% 100V X7R OPTION MURATA GRM32ER72A225KA35L OPTION

2 0 C9 CAP, D CASE OPTION OPTION

3 0 D2 DIODE, SCHOTTKY, 5A POWERDi5 OPTION DIODES INC./ZETEXPDS5100-13 OPTION

4 0 L1 – ALTERNATE IND, 10μH TOKO B1134AS-100M

5 0 L1 – ALTERNATE IND, 10μH WURTH ELECTRONIK 744071100

6 0 Q2 XSTR, MOSFET P-CHANNEL 60V OPTION VISHAY SILICONIX Si7465DP OPTION

7 0 R11 RES, 0402 OPTION OPTION

Hardware

1 4 E1, E2, E8, E9 TURRET MILL MAX 2501-2-00-80-00-00-07-0

2 5 E3, E4, E5, E6, E7 TURRET MILL MAX 2308-2-00-80-00-00-07-0

3 1 JP1 HEADER, 3-PIN SINGLE ROW 2mm SAMTEC TMM-103-02-L-S

4 1 JP2 HEADER, 3-PIN DOUBLE ROW 2mm SAMTEC TMM-103-02-L-D

5 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831

6 2 XJP1, XJP2 SHUNT, 2mm SAMTEC 2SN-BK-G

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dc1722afa

DEMO MANUAL DC1722A

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

3.3 CHANGE 04/19/16 D. B.

VIN

VOUT

VIN

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

3.3

DEMO CIRCUIT 1722A

Tuesday, April 19, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

RB/MI

DAVID B.

C:\DESIGN\17\1722A-3.3\1722A-3.3.DSN

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

3.3

DEMO CIRCUIT 1722A

Tuesday, April 19, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

RB/MI

DAVID B.

C:\DESIGN\17\1722A-3.3\1722A-3.3.DSN

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

3.3

DEMO CIRCUIT 1722A

Tuesday, April 19, 2016

60V, LOW I , STEP-DOWN CONTROLLER

N/A

LTC3864EMSE

RB/MI

DAVID B.

C:\DESIGN\17\1722A-3.3\1722A-3.3.DSN

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

D. B.PROD3 04/17/12

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

D. B.PROD3 04/17/12

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

D. B.PROD3 04/17/12

0.025

2010

VOUT

5V / 2A

COUT3

1uF

6.3V

0603

FDMC5614P

GND

0.1uF

100V

0805

PGOOD

2200pF

0 Ohm

R10

0 Ohm

0 Ohm E9

TRACK

0.1uF

CIN1

10uF

63V

JP2

BURST

CLKIN

SKIP

MODE

6 5

CLKIN

COUT1

100uF

6.3V

1812

Si7465DP

(OPT)

47pF

R11

(OPT)

PDS5100-13

(OPT)

PowerDi5

CIN2

2.2uF

100V

1210

422K

10.0K

100pF

VIN

5V - 55V

(3.5V Min)

0 Ohm

CIN3

2.2uF

100V

1210

(OPT)

100k

JP1

OFF

SHDN

80.6K

SBR3U100LP-7

220pF

0.47uF

0603

LTC3864EMSE

PLL/MODE

FREQ

GND

VFB

ITH

6PGOOD 7

RUN 8

CAP 9

SENSE 10

VIN 11

GATE 12

GND

10uH

COILCRAFT

XAL5050-103ME COUT2

100uF

6.3V

1812

(OPT)

"D" Case

0 Ohm

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dc1722afa

DEMO MANUAL DC1722A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0516 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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