Analog Devices DC2569A Guide de configuration rapide

dc2569af

DEMO MANUAL DC2569A

DESCRIPTION

LTM4661

1.8V-5.5V Input,

Synchronous Step-Up µModule Regulator

Demonstration circuit 2569A is ultrathin step-up µModule

regulator featuring the LTM4661. The DC2569A operates

over 1.8V to 5.5V input and it generates 12V, 1A output

from 5V input. Also, the LTM4661 has precision voltage

reference, which can generate output voltage with 3%

tolerance over the full operating conditions. The 1MHz

switching frequency operation results in small and effi-

cient circuit. The converter operates with only one phase

in burst mode and achieves over 90% efficiency with

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

100mA load. The demonstration circuit can be easily

modified to generate different output voltages.

The DC2569 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/DC2569A

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Minimum Input Voltage IOUT = 0A to 0.3A 1.8V

Maximum Input Voltage IOUT = 0A to 1A 5.5V

VOUT VIN = 1.8V to 5.5V, IOUT = 0A 12V ±3%

Output Voltage Ripple VIN = 5V, IOUT = 1A 20mVP-P

Nominal Switching Frequency 1MHz

BOARD PHOTO

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dc2569af

DEMO MANUAL DC2569A

QUICK START PROCEDURE

Figure 2. Measuring Input or Output Ripple

Figure 1. Proper Measurement Equipment Setup

+–

–

LOAD

IOUT

IIN

VOUT

VIN

LAB

SUPPLY

DC2569A

+ –

OUT

GND

COUT

Demonstration circuit DC2569 is easy to set up to evaluate

the performance of the LTM4661. 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.

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dc2569af

DEMO MANUAL DC2569A

QUICK START PROCEDURE

CHANGING THE OUTPUT VOLTAGE

To change the output voltage from the programmed

12V, change the voltage setting resistors connected to

LTM4661 FB pin (see the schematic on page 5).

CONVERTER OUTPUT CURRENT

The DC2569 output current capability depends on the

input voltage and programmed input current limit. Typi-

cal performance of DC2569A is shown in Figure 3. As can

be seen from Figure 3, the maximum output current is 1A

with 5V input. Switching the mode of operation to BURST

mode can increase the efficiency at light loads.

Figure 3. The 5V Input Efficiency is 90% at 0.6A Load

Figure 4. Thermal Image, 3.3V Input to 12V Output

at 0.8A, 200LFM Air Flow, No Heat Sink

LOAD CURRENT (A)

EFFICIENCY (%)

73 10.6

4661 G02

0.80.4

1.2

0.2

VOUT = 12V, 1A DC

OUTPUT LOAD STEP RESPONSE

The load step response of DC2569A 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 200mA to 400mA load step transients with 3.3V input

are shown in Figure 5. Other types of low ESR and high

value capacitors can be used if space is available to reduce

load transients to desired level.

Figure 5. The LTM4661 Has Good Load Step Response

with Small Output Capacitors (2×22µF)

500µs/DIV

VOUT (AC)

200mV/DIV

LOAD STEP

200mA

TO 400mA

4661 G05

VIN = 3.3V, VOUT = 12V

fS= 1MHz (DEFAULT)

200mA TO 400mA LOAD STEP

OUT

= 2×22µF CERAMIC

START-UP AND SOFT-START FUNCTION

The DC2569 features internal soft-start circuit that ramps

the output voltage up in monotonic fashion. The soft-start

circuit also prevents output voltage overshoot when out-

put voltage ramp reaches regulation.

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dc2569af

DEMO MANUAL DC2569A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP.,10µF, X5R, 16V, 20%, 0805 AVX, 0805YD106MAT2A

KEMET, C0805C106M4PAC7800

KEMET, C0805C106M4PACTU

2 1 COUT1, COUT2 CAP., 22µF, X5R, 16V, 20%, 1206 MURATA, GRM31CR61C226ME15L

3 1 COUT3 CAP., 1µF, X5R, 25V, 10%, 0805 AVX, 08053D105KAT2A

4 2 R1, R6 RES., 1MΩ, 1%, 1/10W, 0603 NIC, NRC06F1004TRF

PANASONIC, ERJ3EKF1004V

VISHAY, CRCW06031M00FKEA

5 1 R5 RES., 11k, 1%, 1/10W, 0603 VISHAY, CRCW060311K0FKEA

6 1 U1 IC,Step-Up DC/DC Power Module, LGA-25 LINEAR TECHNOLOGY, LTM4661EV#PBF

Additional Demo Board Circuit Components

1 0 C1, C2, C3 CAP., 0603, OPTION OPT

2 0 R2, R3, R4 RES., OPTION, 0603 OPT

QUICK START PROCEDURE

Figure 6. The DC2569 Ramps the Output Slowly

at Start-Up without Output Voltage Overshoot

500µs/DIV

VIN

2V/DIV

IIN

200mA/DIV

RUN

2V/DIV

VOUT

10V/DIV

4661 G07

VIN = 3.3V,

VOUT = 12V

fS= 1MHz (DEFAULT)

OUT

= 2×22µF CERAMIC

OUTPUT SHORT CIRCUIT PROTECTION

The LTM4661 features safe short-circuit and thermal pro-

tection. The part can operate continuously with output

shorted while maintaining a maximum set current limit.

The internal peak switch current is reduced during over-

load to about 2A and is restored to 3.5A once the output

exceeds 1.5V.

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dc2569af

DEMO MANUAL DC2569A

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

STEP UP µMODULE REGULATOR

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0603

OFF

PWM

BURST

MODE

RUN

+VIN

1.8V - 5.5V

+VOUT

[email protected]

GND

*OUTPUT WITH 5V INPUT

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

LTM4661EY

Wednesday, June 08, 2016 11

G.P.

N/A

DEMO CIRCUIT 2569A

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

LTM4661EY

Wednesday, June 08, 2016 11

G.P.

N/A

DEMO CIRCUIT 2569A

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

LTM4661EY

Wednesday, June 08, 2016 11

G.P.

N/A

DEMO CIRCUIT 2569A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PROTOTYPE1 5-31-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PROTOTYPE1 5-31-16

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PROTOTYPE1 5-31-16

11K

OPT

CIN1

10uF

10V

0805

COUT3

1uF

25V

0805

C1 OPT

OPT

JP1

OPT

COUT1

22uF

25V

1206

CIN2

OPT

LTM4661EY

VIN

E1 VIN

GND

SYNC/MODE

GND

INTVCC D3

FREQ

VIN

A1 VOUT A4

GND

COMP E4

VOUT A5

VOUT B5

VOUT C5

SDB

FB E5

COUT2

22uF

25V

1206

OPT

JP2

+VIN

INTVCC

+VOUT

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dc2569af

DEMO MANUAL DC2569A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 1117 • 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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