Linear Technology DC2397A Guida rapida alla configurazione

dc2397af

DEMO MANUAL DC2397A

DESCRIPTION

LTC3130EUD-1

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

with 1.6μA Quiescent Current

Demonstration circuit 2397A features the LT C

3130-1, a

wide input voltage, wide output voltage operating range,

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

converter.

The LTC3130-1 has 4-pin selectable output voltages

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

LTC3130-1 incorporates 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 LTC3130-1’s user selectable output voltages are 1.8V,

3.3V, 5.0V and 12V. To set the desired output voltage on

the DC2397A, use the “VOUT JUMPER CONFIGURATION”

table on the front of the board to determine the jumper

settings for JP2 and JP3.

The DC2397A demo board has two user selectable oper-

ating modes:Burst Mode

operation and fixed frequency

PWM (JP1). In PWM Mode, the LTC3130-1 operates at

1.2MHz to allow high efficiency while minimizing the

solution footprint.

Internal compensation reduces footprint size by reducing

the number of external components. This also simplifies

the design process and reduces external component cost.

An accurate RUN threshold can be set to enable the

converter at a desired input voltage. The DC2397A demo

board is set up to use R2 in conjunction with R3 to set

this threshold. See the data sheet for details. L, LT, LTC, LTM, 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

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

anotherhighimpedancesource.TheDC2397A demo board

can be set to operate in MPPC mode by setting jumper

JP4 to “ON”, removing R4 and populating R5 and R6. In

most applications this function can be realized, often with

better efficiency, by using the accurate RUN comparator

functionality. See the data sheet for details.

A PGOOD open-drain output is provided and is pulled

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

regulation.

The LTC3130-1 allows the internal VCC 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 (JP6) on the demo board to “EXT”

back-feeds VCC through EXTVCC from VOUT. Setting this

jumper to internal (“INT”) powers VCC off the VIN input.

See the data sheet for additional details.

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

tion about the operation, specifications, andapplicationsof

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/DC2397A

Input Voltage Range 2.4V to 25V

VOUT 1.8V, 3.3V, 5V, 12V

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.

dc2397af

DEMO MANUAL DC2397A

QUICK START PROCEDURE

Figure2. DC2397A Step Load Response. VIN = 12V,

VOUT = 12V, Load Step is from 100mA to 400mA.

Figure 1: DC2397A Typical Efficiency vs Load. VOUT = 12V.

= 5V, PWM MODE

= 5V, Burst Mode OPERATION

= 24V, Burst Mode OPERATION

= 24V, PWM MODE

LOAD CURRENT (A)

1.0E-04

1.0E-03

1.0E-02

1.0E-01

1.0E+00

100

EFFICIENCY (%)

DC2397A F01

IOUT: 200mA/DIV

VOUT: 500mV/DIV

200μs/DIV

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: MODE FIXED FREQ

JP2: VS1 VCC

JP3: VS2 VCC

JP4: MPPC OFF

JP5: RUN ON

JP6: EXTVCC INT

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

shown in Figure 4. If accurate current measurements

are desired (for efﬁciency calculation for example)

then connect ammeters in series with supplies as

shown. The ammeters are not required however.

3. Connect a 50mA load (240Ω) to VOUT as shown in

Figure 4.

4. Turn on PS1 and slowly increase the voltage until

the voltage at VIN is 3V.

5. Verify VOUT is ~12V.

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

load may need to be reduced for VIN < 3V for VOUT

to remain in regulation.

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

function of VIN and the device current limit. Consult

the data sheet for more information on output cur-

rentvsVIN.

8. VOUT can be varied by setting jumpers JP2 and JP3

in accordance with the “VOUT JUMPER CONFIGU-

RATION” table on the front of the DC2397A demo

board.

9. For operation in Burst Mode, move jumper JP1 to

“Burst Mode” position. See the data sheet for more

information on Burst Mode operation.

10. For operation with VCC powered from VOUT, move

JP6 to “EXT”.

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 regula-

tion (see data sheet).

dc2397af

DEMO MANUAL DC2397A

Figure3. DC2397A Thermal Performance. VIN = 12V, VOUT = 12V, Load = 600mA.

QUICK START PROCEDURE

Figure 4. Proper Measurement Equipment Setup

Figure 5. Measuring Input or Output Ripple

GNDVIN

dc2397af

DEMO MANUAL DC2397A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 3 C1, C5, C6 CAP CER 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 CER 4.7µF 6.3V 10% X5R 0603 MURATA, GRM188R60J475KE19D

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

7 3 R1, R2, R4 RES 2MΩ 1/16W 1% 0402 SMD VISHAY, CRCW04022M00FKED

8 1 L1 INDUCTOR, 10µH, ±20% COILCRAFT, XAL4040-103ME

9 1 U1 25V, 600mA BUCK-BOOST DC/DC CONVERTER LINEAR TECHNOLOGY, LTC3130UDC-1 #PBF

Additional Demo Board Circuit Components

10 0 C3, C14 CAP, 1210 (OPT)

11 0 C4 CAP ALUM 220μF 35V 20% SMD (OPT) PANASONIC, EEE-FP1V221AP

12 0 C13 CAP, 0603 (OPT)

13 0 R3, R5, R6 RES, 0402 (OPT)

14 0 D1 DIODE SCHOTTKY 40V 2A SOD123 (OPT) ROHM, RB068M-40TR

15 6 E1 – E6 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0

16 6 JP1 – JP6 JMP, 3-PIN 1 ROW 0.079" CC SULLINS, NRPN031PAEN-RC

17 6 XJP1 – XJP6 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

18 4 SPACER STACKING #4 SCREW NYLON 0.500" KEYSTONE, 8833

dc2397af

DEMO MANUAL DC2397A

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

10uH

NOTES:

1) Connect GND of R3, R6, C11, C12 and C13 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

VCC

GND

VCC

GND

LTC3130-1

VCC

GND

VCC

GND

VCC

JP2 / VS1 JP3 / VS2

GND

*VOUT JUMPER CONFIGURATION

VOUT

1.8V

5.0V

12VVCC

3.3V

GND

12.0V / 600mA

INT

EXT

OFF

NOTE: FOR MPPC, REMOVE R4 AND

POPULATE R5 AND R6. DO NOT ALLOW

MPPC PIN VOLTAGE TO EXCEED 6.0V.

OFF

BURST MODE

FIXED FREQ

VIN > 13V

VIN

VOUT

RUN

VS1

MODE

VS2

PGOOD

MPPC

EXTVcc

VS2VS1

PGOOD

VCC

EXTVcc

VOUT

VIN

RUN

VCC

MPPC

VIN

MODEVCC

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 2397A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC-1

J.NOON

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 CIRCUIT 2397A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC-1

J.NOON

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 CIRCUIT 2397A

DC / DC CONVERTER WITH 1.6uA QUIESCENT CURRENT

N/A

LTC3130UDC-1

J.NOON

05- 23 - 16

25V, 600mA BUCK-BOOST

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JIM N.PRODUCTION

-3 05 - 23 - 16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JIM N.PRODUCTION

-3 05 - 23 - 16

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

JIM N.PRODUCTION

-3 05 - 23 - 16

XAL4040-103ME

C10

0.1uF

E4 VOUT

22uF

25V

1210

1uF

0805

50V

GND

E5 GND

22uF

25V

1210

E6 GND

JP6

EXTVcc

JP4

MPPC

D1 OPT

OPT

0.1uF

JP5

RUN

2MEG

C11

4.7uF

6.3V

1uF

0805

50V

JP2

VS1

10uF

50V

1210

JP3

VS2

C13

OPT

C12

4.7uF

50V

0805

VIN

2.4V-25V

OPT

1210

PGOOD

2MEG

LTC3130UDC-1

SVIN

SW1 20

VOUT 14

SW2 15

VS1

MODE

GND

VS2

PGND

RUN

BST1 1

BST2 16

GND

PGND

MPPC 6

EXTVCC 12

VCC 5

GND

PGOOD 13

PVIN

2MEG

OPT

C14

OPT

1210

JP1

MODE

1uF

0805

50V

dc2397af

DEMO MANUAL DC2397A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0816 • 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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