Linear Technology DC2355A Manuel utilisateur

dc2355af

DEMO MANUAL DC2355A

Description

LTC3130EUD

25V, 600mA Buck-Boost DC/DC Converter

with 1.6µA Quiescent Current

Demonstration Circuit 2355A features the LT C

3130, a

wide input voltage, wide output voltage operating range,

high efficiency, low noise monolithic DC/DC buck-boost

converter.

The LTC3130 operates from input voltages of 2.4V to 25V.

The demo board has been designed with the output voltage

setto5V.TheLTC3130incorporates a proprietary low noise

switching algorithm which optimizes efficiency with input

voltages above, below or equal to the output voltage and

ensures seamless transitions between operating modes.

The DC2355A demo board has two user selectable operat-

ing modes:Burst Mode

operation and Fixed Frequency

PWM (JP2). In PWM Mode, the LTC3130 operates at

1.2MHz to allow high efficiency while minimizing the

solution footprint.

The LTC3130 features pin selectable 850mA/450mA aver-

age inductor current limit. To set the current limit to 850mA

set jumper JP1 to “HIGH”. For 450mA current limit set

JP1 to “LOW”. The lower current limit function is useful

when operating from weak, or current limited sources.

A PGOOD open drain output is provided and is pulled

up to VOUT. This output asserts low when VOUT is below

regulation.

An accurate RUN threshold can be set to enable the con-

verter at a desired input voltage. The DC2355A demo board

is set up to use R10 in conjunction with R11 to set this L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode operation are registered

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

respective owners.

performance summary

threshold. Jumper JP4 is provided to pull this input up to

VIN or tie it directly to GND. See the data sheet for details.

Maximum power point control (MPPC) allows for simple

optimization of power transfer between the converter and

a non-ideal supply such as a photovoltaic panel or another

high impedance source. The DC2355A demo board can

be set to operate in MPPC mode by setting jumper JP3

to “ON”, removing R8 and populating R7 and R9. In most

applications this function can also be realized, often with

better efficiency, by using the accurate RUN comparator

functionality. See the data sheet for details.

TheLTC3130 allows the internalVCC rail to be fed externally

from the EXTVCC pin. In some applications the efficiency

of the converter can be improved by allowing VCC to be

back-fed from a supply, such as VOUT. Setting the EXTVCC

jumper (JP5) on the demo board to “EXT” back-feeds VCC

through EXTVCC from VOUT. Setting this jumper to internal

(“INT”) powers VCC from the VIN input. See the data sheet

for additional details.

The LTC3130/LTC3130-1 data sheet has detailed informa-

tion about the operation, specifications, and applications

of the device. The data sheet should be read in conjunction

with this quick start guide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2355A

Specifications are at TA= 25°C

Input Voltage Range 2.4V to 25V

VOUT 5V

IOUT (see Note 1) 600mA

Efficiency See Figure 1

Note 1: The demo board output current is a function of VIN. Please refer to the data sheet for more information.

dc2355af

DEMO MANUAL DC2355A

Quick start proceDure

Using short twisted pair leads for any power connections

and with all loads and power supplies off, refer to Figure 4

for the proper measurement and equipment setup. The

power supply (PS1) should not be connected to the circuit

until told to do so in the procedure below.

When measuring the input or output voltage ripple, care

must be taken to avoid a long ground lead on the oscil-

loscope probe. Measure the input or output voltage ripple

by touching the probe tip directly across the VIN or VOUT

and GND terminals (see Figure 5), or by using an oscil-

loscope probe tip jack.

1. Jumper and PS1 settings to start:

PS1: OFF

JP1: ILIM HIGH

JP2: MODE FIXED FREQ

JP3: MPPC OFF

JP4: RUN ON

JP5: EXTVCC EXT

2. With power OFF connect the power supply (PS1) as

shown in Figure 4. If accurate current measurements

are desired (forefficiencycalculation for example)then

connect ammeters in series with supplies as shown.

The ammeters are not required however.

3. Connect a 500mA load (10Ω) to VOUT as shown in

Figure 4.

4. Turn on PS1 and slowly increase the voltage until the

voltage at VIN is 5V.

5. Verify VOUT is ~5V.

6. VIN can now be varied between 2.4V and 25V. The

load may need to be reduced for VIN < 5V for VOUT to

remain in regulation.

7. The load can be varied. The maximum load is a func-

tion of VIN and the device current limit. Consult the

data sheet for more information on output current vs

VIN.

8. For operation in Burst Mode, move jumper JP2 to

“BURST MODE”. See the data sheet for more informa-

tion on Burst Mode operation.

9. For operation with the lower current limit move jumper

JP1 to “LOW”. Output current capability is reduced

with the lower current limit. See the data sheet for

more information.

10. For operation with VCC powered from VIN, move jumper

JP5 to “INT”.

NOTE: If VOUT drops out of regulation, check to be sure the

maximum load has not been exceeded, and that VIN is not

below the minimum value for regulation (see data sheet).

VIN (V)

EFFICIENCY (%)

DC2355A F01

200 10 15

EXTVCC, 600mA LOAD, PWM

INTVCC, 600mA LOAD, PWM

EXTVCC, 50mA LOAD, BURST

INTVCC, 50mA LOAD, BURST

200µs/DIV DC2355A F02

VOUT

200mV/DIV

IOUT

200mA/DIV

Figure 1. DC2355A Typical Efficiency vs Load

with and without Externally Feeding VCC

Figure 2. DC2355A Step Load Response, VIN = 5V.

Load Step Is from 100mA to 400mA

dc2355af

DEMO MANUAL DC2355A

Quick start proceDure

GND

Figure 3. DC2355A Thermal Performance. VIN = 12V, Load = 600mA

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Input or Output Ripple

dc2355af

DEMO MANUAL DC2355A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C5, C6 CAP., 1µF 50V 10% X7R 0805 MURATA, GRM21BR71H105KA12L

2 1 C2 CAP CER 10µF 50V X7R 1210 MURATA, GRM32ER71H106KA12L

3 2 C7, C8 CAP CER 22µF 25V X7R 1210 MURATA, GRM32ER71E226KE15L

4 2 C9, C10 CAP CER 0.1µF 50V X7R 0603 MURATA, GRM188R71H104KA93D

5 1 C11 CAP., 4.7µF 6.3V 10% X5R 0603 MURATA, GRM188R60J475KE19D

6 1 C12 CAP., 4.7µF 50V 10% X5R 0805 MURATA, GRM21BR61H475KE51L

7 1 C13 CAP CER 22pF 50V C0G 0603 MURATA, GRM1885C1H220JA01D

8 1 R1 RES 1M, 1/10W 1% 0402 VISHAY, CRCW04021M00FKED

9 1 R2 RES 249k, 1/16W 1% 0402 VISHAY, CRCW0402249KFKED

10 1 R3 RES 49.9, 1/10W 1% 0402 VISHAY, CRCW040249R9FKED

11 1 R4 RES SMD 75kΩ 1% 1/10W 0402 VISHAY, CRCW040275K0FKED

12 4 R5, R6, R8, R10 RES SMD 2MΩ 1% 1/16W 0402 VISHAY, CRCW04022M00FKED

13 1 L1 INDUCTOR, 10µH, ±20% COILCRAFT, XAL4040-103ME

14 1 U1 25V, 600mA BUCK BOOST DC/DC CONVERTER LINEAR TECHNOLOGY, LTC3130EUDC#PBF

Additional Demo Board Circuit Components

15 0 C3, C15 CAP, 1210 (OPT)

16 0 C4 CAP ALUM 220µF 35V 20% SMD (OPT) PANASONIC, EEE-FP1V221AP

17 0 C14 CAP, 0603 (OPT)

18 0 R7, R9, R11 RES, 0402 (OPT)

19 0 D1 DIODE SCHOTTKY 40V 2A SOD123 (OPT) ROHM, RB068M-40TR

Hardware: For Demo Board Only

20 6 E1-E6 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

21 5 JP1-JP5 CONN., HEADER, 1×3, 2mm SULLINS, NRPN031PAEN-RC

22 5 XJP1-XJP5 SHUNT, 2mm SAMTEC, 2SN-BK-G

23 4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833

dc2355af

DEMO MANUAL DC2355A

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

OFF

BURST MODE

FIXED FREQ

HIGH

LOW

OFF

INT

EXT

VIN > 6V

NOTES:

1) Connect GND of R2, R7, R11, C11, C12 and C14 directly to

pins 7 and 8. Connect pins 7 and 8 to IC Pad directly under

IC. Connect pins 18 and 19 to copper plane and IC pad

directly under IC.

UNLESS NOTED:

RESISTORS: OHMS, 0402, 1%

CAPACITORS: 0603

NOTE: FOR MPPC, REMOVE R8 AND

POPULATE R7 AND R9. DO NOT ALLOW

MPPC PIN VOLTAGE TO EXCEED 6.0V.

VIN VOUT

RUN

MODE

MPPC

VCC

VCC MODE

PGOOD VCC

MPPC

VIN VIN

RUN

EXTVcc

VOUT

VCC

EXTVcc

PGOOD

ILIM

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 CIRCUIT2355A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC

05-23-16

25V, 600mA BUCK-BOOST

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 CIRCUIT2355A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC

05-23-16

25V, 600mA BUCK-BOOST

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 CIRCUIT2355A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC

05-23-16

25V, 600mA BUCK-BOOST

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JNPRODUCTION

-3 05-23-16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JNPRODUCTION

-3 05-23-16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JNPRODUCTION

-3 05-23-16

22uF

25V

1210

1uF

0805

50V

PGOOD

22uF

25V

1210

VOUT

5.0V / 600mA

C10

0.1uF

D1 OPT

2MEG

1uF

0805

50V

GND

E5 GND

JP4

RUN

E6 GND

OPT

JP3

MPPC

1MEG

XAL4040-103ME

10uH

75k

C15

OPT

1210

JP2

MODE

C11

4.7uF

6.3V

C14

OPT

1uF

0805

50V

OPT

10uF

50V

1210

OPT

1210

R11

OPT

249K

C12

4.7uF

50V

0805

VIN

2.4V-25V R3

49.9

JP1

ILIM

2MEG

JP5

EXTVcc

R10

2MEG

C13

22pF

2MEG

LTC3130UDC

PVIN

SW1 20

VOUT 14

SW2 15

ILIM

MODE

GND

FB 9

PGND

RUN

BST1 1

BST2 16

GND

PGND

MPPC

EXTVCC 12

VCC 5

SVIN

PGOOD 13

GND

0.1uF

dc2355af

DEMO MANUAL DC2355A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0916 • 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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