Linear Technology LT8494 Quick setup guide

dc2242af

DEMO MANUAL DC2242A

Description

LT8494

SEPIC/Boost DC/DC Converter with 2A,

70V Switch, and 7µA Quiescent Current

Demonstration circuit 2242A is a monolithic SEPIC con-

verter featuring LT

8494.The demo board is designed for

5V output from a 3V to 60V input at 450kHz switching

frequency. The max output current is 1A when the input

voltage is above 12V, and is reduced with lower input volt-

age.ThequiescentcurrentofLT8494islessthan7μA when

operating. Dual supply pins (VIN and BIAS)allow the part

to automatically operate from the most efficient supply.

Low ripple Burst Mode

operation increases the efficiency

at the light load while keeping the output ripple below

10mV. Figure 1shows the demo board efficiency at 12V

input voltage.Figure 2shows the maximum load current

with different input voltages of the demo board.

L,LT ,LT C ,LT M ,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

The LT8494 data sheet gives a complete description of the

part,operation and application information.The data sheet

must be read in conjunction with this demo manual for

DC2242A. The LT8494 is assembled in 20-lead QFN and

20-lead plastic TSSOP packages.Proper board layout is

essentialformaximumthermalandelectricalperformance.

See the data sheet sections for details.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2242A

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 3 60 V

VOUT Output Voltage 4.86 5.04 5.24 V

fSW Switching Frequency RT= 169kΩ 414 450 477 kHz

IOUT Max Output Current VIN = 12V 1 A

EFE Efficiency at DC VIN = 12V, IOUT = 1A 80.3 %

LOAD CURRENT (A)

EFFICIENCY (%)

0.4

DC2242A F01

10.20 0.6 0.8

VIN = 12V

VOUT = 5V

fSW = 450kHz

INPUT VOLTAGE (V)

MAXIMUM LOAD CURRENT (A)

1.0

2.5

0.5

1.5

2.0

DC2242A F01

60100 30 5040

Figure 1. LT8494 Efficiency Figure 2. LT8494 Maximum Load Current

(Typical) vs Input Voltage

dc2242af

DEMO MANUAL DC2242A

Quick start proceDure

DC2242A is easy to set up to evaluate the performance

of the LT8494. Refer to Figure 3for proper measurement

equipment setup and follow the procedure below:

NOTE. When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe.Measure the input or output voltage

ripple by touching the probe tip directly across the VIN

or VOUT and GND terminals.See Figure 4for the proper

scope technique.

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

and GND.Make sure that the input voltage does not

exceed 60V.

2. With power off, connect loads from VOUT to GND.

3. Turn on the power at the input.

4. Check for the proper output voltages (VOUT = 5V).

NOTE: If there is no output,temporarily disconnect the

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

is shorted.

5. Once the proper output voltage is established,adjust

the load within the operating ranges and observe the

output voltage regulation,ripple voltage,efficiency and

other parameters.

dc2242af

DEMO MANUAL DC2242A

Quick start proceDure

Figure 3. Proper Measurement Equipment Setup

OUT

GND

Figure 4. Measuring Input or Output Ripple

dc2242af

DEMO MANUAL DC2242A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C2, C8 CAP., X7R, 2.2µF, 100V, 10%, 1210 MURATA, GRM32ER72A225KA35L

2 2 C3, C4 CAP., X7R, 47µF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE15L

3 2 C5, C7 CAP., X7R, 1µF, 10V, 10%, 0603 MURATA, GRM188R71A105KA61D

4 1 C6 CAP., NP0, 4.7pF, 50V, ±0.25pF, 0603 MURATA, GRM1885C1H4R7CA01D

5 1 D1 DIODE, SCHOTTKY 100V, 2A, SMA ON SEMI., MBRA2H100T3G

6 1 L1 INDUCTOR, 15µH VISHAY, IHCL4040DZER150M5A

7 2 R1, R10 RES., CHIP, 1M, 1/10W, 0603 VISHAY, CRCW06031M00FKEA

8 1 R2 RES., CHIP, 316K, 1/10W, 1%, 0603 VISHAY, CRCW0603316KFKEA

9 1 R4 RES., CHIP, 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA

10 1 R6 RES., CHIP, 169k, 1/10W, 1%, 0603 VISHAY, CRCW0603169KFKEA

11 1 R9 RES., CHIP, 0, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

12 1 U1 I.C., , LT8494, TSSOP-20-4.4mm LINEAR TECH., LT8494EFE#PBF

Additional Demo Board Circuit Components

1 1 C1 CAP., ALUM, 10µF, 63V, 20% SUN ELECTRONIC, 63CE10BS

2 0 C10 (OPT) CAP., OPTION, 0603 OPT

3 0 R11 (OPT) RES., OPTION, 0603 OPT

Hardware: For Demo Board Only

1 6 E1-E6 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

dc2242af

DEMO MANUAL DC2242A

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

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0603.

(450kHz)

100V

THE MAX LOAD CURRENT IS REDUCED WHEN THE

INPUT VOLTAGE IS LESS THAN 12V. PLEASE SEE

DEMO MANUAL FOR DETAILS.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2242A

Tuesday, May 05, 2015 11

SEPIC CONVERTER WITH LOW IQ

N/A

LT8494EFE

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2242A

Tuesday, May 05, 2015 11

SEPIC CONVERTER WITH LOW IQ

N/A

LT8494EFE

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

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.

www.linear.com

DEMO CIRCUIT 2242A

Tuesday, May 05, 2015 11

SEPIC CONVERTER WITH LOW IQ

N/A

LT8494EFE

R10

VIN

3V - 60V

1uF

0603

10V

R11

OPT

GND

2.2uF

1210

SWEN

MBRA2H100T3G

1uF E5 PG

100K

2.2uF

100V

1210

47uF

1210

10V

E4 GND

C10

OPT

10uF

63V

63CE10BS

LT8494EFE

NC 11

SWEN

NC 13

NC 15

VIN

GND

SW 20

BIAS 1

FB 3

PG 7

FB 2

GND

E3 VOUT

5V / 1A

47uF

10V

1210

169K

316K

4.7pF

15uH

IHCL4040DZ-5A

1 3

dc2242af

DEMO MANUAL DC2242A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2015

LT 0715 • 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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