Linear Technology LTC3124 Quick setup guide

dc1859afa

DEMO MANUAL DC1859A

DESCRIPTION

LTC3124

Dual Phase Synchronous

Step-Up DC/DC Converter

Demonstration circuit 1859A is a dual phase single out-

put DC/DC boost converter featuring the LT C

3124. The

DC1859A operates over 1.8V to 5.5V input and generates

12V at up to 1.5A from a 5V input. The maximum output

current for a 1.8V input is 750mA. Also, the LTC3124 has

a2% precise voltage reference, which can generate an

output voltage with 2.2% tolerance if 0.1% voltage divider

resistors are used. The 1MHz switching frequency opera-

tion results in small and efficient circuit. The converter

operates with only one phase in Burst Mode

operation 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

and achieves over 90% efficiency with a 100mA load. The

demonstration circuit can be easily modified to generate

different output voltages.

The DC1859 has small circuit footprint. It is a high perfor-

mance and cost effective solution for generating output

voltages up to 15V from inputs as low as 1.8V.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1859A

Specifications are at TA= 25°C

PARAMETER CONDITION MIN TYP MAX UNITS

Minimum Input Voltage IOUT = 0A to 0.75A 1.8 V

Maximum Input Voltage IOUT = 0A to 1.5A 5.5 V

VOUT VIN = 1.8V to 5.5V, IOUT = 0A 12 V ±4%

Output Voltage Ripple VIN = 5V, IOUT = 1.5A 100 mVP-P

Nominal Switching Frequency 1 MHz

dc1859afa

DEMO MANUAL DC1859A

QUICK START PROCEDURE

Demonstration circuit 1859 is easy to set up to evaluate

the performance of the LTC3124. For proper measure-

ment equipment setup refer to Figure 1 and follow the

procedure below:

NOTE: When measuring the input or output voltage ripple,

care must be taken to minimize the length of oscilloscope

probe ground lead. Measure the input or output voltage

ripple by connecting the probe tip directly across the VIN

or VOUT and GND terminals as shown in Figure 2.

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

and GND.

2. Keep the load set to 0A or disconnected.

3. Turn the input power source on and slowly increase the

input voltage. Be careful not to exceed 5.5V.

NOTE: Make sure that the input voltage VIN does not

exceed 5.5V.

4. Set the input voltage to 5V and check for the proper

output voltage of 12V. If there is no output, temporarily

disconnect the load to make sure that the load is not

set too high.

5. Once the proper output voltage is established, adjust

the load and observe the output voltage regulation,

ripple voltage, efficiency and other parameters.

Figure 1. Proper Measurement Equipment Setup

dc1859afa

DEMO MANUAL DC1859A

+ –

VOUT GND

COUT

Figure 2. Measuring Input or Output Ripple

QUICK START PROCEDURE

Changing the Output Voltage

To change the output voltage from the programmed 12V,

change the voltage divider resistors connected to LTC3124

FB pin (see the schematic on page 5).

Converter Output Current

The DC1859 output current capability depends on the

input voltage. Typical performance of DC1859A is shown

in Figure 3. As can be seen from Figure 3, the maximum

output current is 800mA with 2.6V input and 2A with 5V

input. The efficiency is high at light loads thanks to phase

shedding in BURST mode. By disabling one phase the

related switching losses are reduced and the efficiency

is maximized.

Figure 3. The Efficiency Is Maximized for Light Loads by

Shedding One Phase in Burst Mode Operation. The Efficiency Is

Over 90% at Higher Loads and It Reaches 92% at 800mA Load

Output Load Step Response

The load step response of DC1859A is dependent on the

amount and type of output caps used. If higher load steps

need to be handled more output capacitance can be added

in order to keep the voltage transients at the desired level.

The load step transients are shown in Figure 4. Other types

of low ESR and high value capacitors can be used if space

is available to reduce load transients to desired level.

Figure 4. The LTC3124 Has Excellent Load Step Response with

Small Output Capacitors Thanks to High Switching Frequency

and Fast Feedback Loop Compensation

Start-Up and Soft-Start Function

The DC1859 features internal 10ms soft-start circuit that

prevents input current surge at start-up. The soft-start

circuitalsopreventsoutput voltage overshoot when output

voltage ramp reaches regulation.

IOUT (mA)

EFFICIENCY (%)

dc1859a F03

1 1000

10000

10010

PWM MODE

Burst Mode OPERATION

VIN = 2.6V

VIN = 5V

dc1859afa

DEMO MANUAL DC1859A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

2 1 C2 CAP, 0805 10µF 10% 10V X5R MURATA GRM21BR61A106KE19L

3 1 C3 CAP, 0603 4.7µF 10% 10V X5R AVX 0603ZD475KAT2A

4 1 C4 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT2A

5 2 C5, C6 CAP, 1206 22µF 20% 25V X5R MURATA GRM31CR61E226ME15L

7 1 C8 CAP, 0805 1µF 20% 16V X5R AVX 0805YD105MAT2A

8 1 C9 CAP, 0603 680pF 10% 25V X7R AVX 06033C681KAT2A

9 1 C10 CAP, 0603 56pF 5% 50V C0G AVX 06035A560JAT2A

12 2 L1, L2 IND, 4.7µH COILCRAFT XAL6060-472MEC

14 1 R1 RES, 0603 28k 1% 1/10W VISHAY CRCW060328K0FKEA

16 1 R4 RES, 0603 1M 1% 1/10W VISHAY CRCW06031M00FKEA

17 1 R5 RES. 0603 110k 1% 1/10W VISHAY CRCW0603110KFKEA

18 1 R6 RES, 0603 51.1k 1% 1/10W VISHAY CRCW060351K1FKEA

19 2 R8, R9 RES, 0603 1M 5% 1/10W VISHAY CRCW06031M00JNEA

20 1 U1 IC, DC/DC CONVERTER LINEAR TECH. LTC3124EDHC#PBF

Additional Demo Board Circuit Components

1 0 C1, C11 CAP. 7343 OPTION OPTION

6 0 C7 CAP, 0603 OPTION OPTION

15 0 R3, R7 RES, 0603 OPTION OPTION

Hardware: For Demo Board Only

10 6 E1, E2, E3, E4, E5, E6 TURRET MILL MAX 2501-2-00-80-00-00-07-0

11 2 JP1, JP2 HEADER, 3 PIN SINGLE ROW SULLINS, NRPN031PAEN-RC

13 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831

21 2 JP1, JP2 SHUNT SAMTEC 2SN-BK-G

QUICK START PROCEDURE

Output Short Circuit Protection

The LTC3124 features safe short-circuit and thermal

protection. The part can operate continuously with output

shortedwhile maintaining amaximum set current limit. The

peak switch current is reduced during overload to about

2A and is restored to 3.5A once the output exceeds 1.5V.

Figure 5. The DC1859 Ramps the Output Slowly at Start-Up

without Generating an Input Current Surge

dc1859afa

DEMO MANUAL DC1859A

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

1.5A [1]

NOTE: UNLESS OTHERWISE SPECIFIED,

[1] OUTPUT WITH 5V INPUT. SEE QSG FOR OTHER INPUTS.

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

DEMO CIRCUIT 1859A

Wednesday, June 25, 2014

DUAL PHASE SYNCHRONOUS STEP-UP

N/A

LTC3124EDHC

GORAN P.

DC/DC CONVERTER

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

DEMO CIRCUIT 1859A

Wednesday, June 25, 2014

DUAL PHASE SYNCHRONOUS STEP-UP

N/A

LTC3124EDHC

GORAN P.

DC/DC CONVERTER

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

DEMO CIRCUIT 1859A

Wednesday, June 25, 2014

DUAL PHASE SYNCHRONOUS STEP-UP

N/A

LTC3124EDHC

GORAN P.

DC/DC CONVERTER

GND

JP1

PWM

BURST

MODE

JP1

PWM

BURST

MODE1

0.1uF

(OPT)

(OPT) E5

GND

OPT

51.1k

1uF

25V

1uF

25V

VIN

1.8V - 5.5V

VIN

1.8V - 5.5V

110k

PWM/SYNC

LTC3124EDHC

PGNDA

VIN

SGND

PGNDB

PWM/SYNC

SWA

VCC

SWB

VOUTA

VOUTB

CAP

EXPOSED PAD

C11

OPT

C11

OPT

680pF

VOUT

12V

VOUT

12V

4.7uH

XAL6060-472

Coilcraft

4.7uH

XAL6060-472

Coilcraft

28k

4.7uH

XAL6060-472

Coilcraft

4.7uH

XAL6060-472

Coilcraft

4.7uF

10V

4.7uF

10V

JP2

OFF

RUN

JP2

OFF

RUN

OPT

C10

56pF

C10

56pF

10uF

10V

10uF

10V

22uF

25V

22uF

25V

22uF

25V

22uF

25V

OPT

dc1859afa

DEMO MANUAL DC1859A

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 1014 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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