Linear Technology LTC3129 Guida rapida alla configurazione

dc1922af

DEMO MANUAL DC1922A

Description

LTC3129

15V, 200mA Synchronous Buck-Boost DC/DC Converter

with 1.3µA Quiescent Current

Demonstration Circuit 1922A features the LT C

3129, a

high efficiency 200mA buck-boost DC/DC converter with

a wide VIN and VOUT range.

The DC1922A demo board has two user selectable operat-

ing modes: Burst Mode

Operation and Fixed Frequency

PWM (JP3). There is also an accurate programmable

RUN pin which is used to ENABLE the converter (JP1).

The LTC3129 also incorporates a maximum power point

controlfunctionwhichcanbeenabled(JP2)forapplications

where the input source is a solar cell or is high impedance,

such as intrinsically safe applications or high ZOUT thermal

electric generators (TEGs).

The DC1922A operates with a 2.42V to 15V input voltage

range, and has been designed with the output voltage set

to 5.0V. Once the converter is started the LTC3129 can

operate with VIN as low as 1.92V provided VCC is back-

fed. The demo board has optional provisions to back-

feed VCC (D1) in order to increase efficiency in some 5V

L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks

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

owners.

output applications, or to allow operation with VIN down

to 1.92V. Consult the data sheet for more information on

these options.

The DC1922A demo board also incorporates a connector

(J1) which can be used to connect to a Dust Networks

Mote demo board.

Figure 1 shows typical demo board efficiency and Figure 2

shows typical step response.

The LTC3129 data sheet has detailed information about

the operation, specification, and applications of the part.

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

performance summary

Specifications are at TA= 25°C

PARAMETER VALUE

Input Voltage Range 2.42V to 15V

VOUT 5.0V

IOUT (See Note 1) 200mA, for VIN > VOUT

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.

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dc1922af

DEMO MANUAL DC1922A

Description

Figure 1. DC1922A Efficiency in AUTOBURST MODE

DC1922A Efficiency vs Load, VOUT = 5V

Figure 2. DC1922A Step Response

VIN = 15V

VIN = 10V

VIN = 5V

VIN = 3V

VIN = 10V

VIN = 5V

VIN = 15V

VIN = 3V

(PWM)

LOAD (mA)

0.01

EFFICIENCY (%)

100

10 100 10000.1

dc1922a F01

(AUTOBURST)

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dc1922af

DEMO MANUAL DC1922A

Quick start proceDure

Using short twisted pair leads for any power connections

and with all loads and power supplies off, refer to Figure 3

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 4), or by using an oscil-

loscope probe tip jack.

1. Jumper, PS1 and LOAD settings to start:

PS1 = OFF

JP1 (RUN) = ON

JP2 (MPPC) = OFF

JP3 (PWM) = BURST MODE OPERATION

JP4 (DUST PWR) = NC

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

shown in Figure 3. If accurate current measurements

are desired (for efﬁciency calculations for example)

thenconnectanammeter(AM1)inserieswiththesup-

ply as shown. The ammeter is not required however.

3. Connect a 50mA load to VOUT as shown in Figure 3

(100Ω for VOUT = 5V). Connect an ammeter (AM2) if

accuratecurrentmeasurementormonitoringis

desired.

4. Turn on PS1 and slowly increase voltage until the

voltage at VIN is 4.0V.

5. Verify VOUT is ~5.0V.

6. VIN can now be varied between 2.42V and 15.0V.

VOUT should remain in regulation.

7. Load current (IOUT) can also be varied. The maximum

IOUT is a function of VIN and the current limit. Consult

the data sheet for more information on IOUT vs VIN.

In general for VIN > VOUT IOUT can be increased to

200mA. For VIN <VOUT IOUT capability willbe reduced.

8. For operation in ﬁxed frequency (PWM) mode move

Jumper JP3 to FIXED FREQ. See the data sheet for

more information on Burst Mode operation.

9. NOTE: If VOUT drops out of regulation, check to be

sure that VIN is not below the minimum value for

regulation (see data sheet).

For USE with a Solar Cells/MPPC:

10. With power OFF move jumper MPPC (JP2) to ON.

11. If using a power supply as the source, place a mini-

mum of 10Ω, 10W resistor in series with the input to

simulate the source resistance. If using a solar cell (s)

or high impedance source, no additional resistance

should be needed.

12. Set resistor R9 to a value which will set the MPPC

pin to the desired voltage. See the data sheet section

“Programming the MPPC Voltage” for more informa-

tion.

13. With no load and the MPPC voltage set, increase the

sourcevoltage above the MPPCset point.VOUT should

be in regulation. As the load is increased VIN will drop

until it reaches the MPPC set voltage. As the load is

increased further, VOUT will drop out of regulation,

but VIN will be regulated to the set point voltage. This

is to prevent the input source from collapsing and to

allow the maximum power to be extracted from the

source.

14. Consult the data sheet for more information on

maximum power point control (MPPC) operation.

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dc1922af

DEMO MANUAL DC1922A

For USE with a DUST Networks MOTE demo board:

15. Connector J1 is designed to interface with a Dust

Networks Mote demo board. Consult the Dust

documentation for optimal VOUT regulation setting.

In general the Dust Networks Mote will operate with

VOUT set to 3.3V. However, care should be taken to

not overvoltage the Mote. Newer Motes may require

a different VOUT. The DC1922A demo board can be

conﬁgured for different VOUT voltages by simply

changing R2.

16. The DC1922A demo board can be conﬁgured for

VOUT = 3.3V by changing resistor R2 to 1.1M for

R1 = 2M.

Quick start proceDure

17. Once the output voltage has been set to the proper

voltage and with the power supply OFF connect

DC1922A to the Dust Networks Mote demo board

using J1. See Figure 5 and 6 for the proper connec-

tions and orientation. Move jumper JP4 to VOUT.

18. Once the boards have been connected, turn on PS1

and increase the voltage to approximately 3V. VOUT

should now be in regulation. VIN can now be varied

over the operating range and VOUT should remain in

regulation.

GND

VIN

Figure 3. Proper Measurement Equipment Setup

Figure 4. Measuring Input or Output Ripple

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dc1922af

DEMO MANUAL DC1922A

Quick start proceDure

Figure 5. DC1922A Connected to DC9003 Dust Mote (Top View)

Figure 6. DC1922A Connected to DC9003 Dust Mote (Bottom View)

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dc1922af

DEMO MANUAL DC1922A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP CER 22µF, 25V, X5R, 20%,1210 TDK, C3225X5R1E226M

2 2 C2, C4 CAP CER 1.0µF, 25V, X5R, 20%, 0603 TDK, C1608X5R1E105M

3 1 C3 CAP CER 22µF, 10V, X5R, 20%, 1210 TDK, C3225X5R1A226M

4 2 C5,C6 CAP CER 22000pF, 50V, X7R, 10%, 0603 TDK, C1608X7R1H223K

5 1 C7 CAP CER 33pF, 50V, 5%, NP0 0603 TDK, C1608C0G1H330J

6 1 C9 CAP CER 2.2µF, 10V, X7R, 20%, 0603 TDK, C1608X7R1A225M

7 1 C10 CAP CER 10pF, 50V, NP0, ±0.25pF 0603 TDK, C1608C0G1H100C

8 1 L1 INDUCTOR, 10µH COILCRAFT, EPL3015-103

9 1 Q1 N-CHANNEL MOSFET, 20V, SOT23 DIODES/ZETEX, ZXMN2F30FHTA

10 4 R1, R4, R5, R6 RES,CHIP, 2.0M, 1/16W, 1%, 0402 VISHAY, CRCW04022M00FKED

11 1 R2 RES, CHIP, 619k, 1/16W,1%, 0402 VISHAY, CRCW0402619KFKED

12 1 R3 RES, CHIP, 2.21k, 1/16W, 1%, 0402 VISHAY, CRCW04022K21FKED

13 1 U1 15V, 200mA SYNCHRONOUS BUCK - BOOST DC / DC CONVERTER

WITH 1.3µA QUIESCENT CURRENT

LINEAR TECHNOLOGY, LTC3129EUD

Additional Demo Board Circuit Components

1 0 C8 CAP TANT 68µF, 20V, 10%, SMD 7343 (OPT)OPT

2 0 C11 CAP CER 6.3V, 0603 (OPT)OPT

3 0 D1 DIODE SCHOTTKY (OPT)OPT

4 0 R7, R8, R9 RES 1/10W, 1%, 0402 SMD (OPT)OPT

Hardware: For Demo Board Only

1 5 E1, E2, E3, E4, E5 TESTPOINT, TURRET 0.094" MILLMAX 2501-2-00-80-00-00-07-0

2 1 J1 HEADER, 2 ×6, 12-PIN, SMT HORIZONTAL SOCKET W/KEY, 0.100" SAMTEC, SMH-106-02-L-D-05

3 4 JP1, JP2, JP3, JP4 JMP, 0.079 SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S

4 4 XJP1, XJP2, XJP3, XJP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G

5 4 (STAND-OFFS) STAND-OFF, NYLON 0.625" Tall KEYSTONE, 8834(SNAP ON)

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dc1922af

DEMO MANUAL DC1922A

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

B B

A A

OFF

RUN MPPC

OFF

PWM

BURST MODE

FIXED FREQ

2.4V - 15V

NOTE: UNLESS OTHERWISE

SPECIFIED

1. ALL RESISTORS ARE IN OHMS, 0402

ALL CAPACITORS ARE IN MICROFARADS, 0603.

CAUTION: ONLY

CONNECT IF VOUT IS

CONFIGURED FOR 3.3V

VIN > VOUT

DUST PWR

VOUT

VCC

VIN

VIN VIN

VCC

VOUT

PWM

VCC MPPC

MPPC

PWM

RUN

VOUT

PGOOD

VOUT

SIZE

DATE:

.VER.ONCI

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 1922A

CONVERTER WITH 1.3uA QUIESCENT CURRENT

N/A

LTC3129EUD

J.NOON

01 - 02 - 13

15V, 200mA, SYNCHRONOUS BUCK - BOOST DC / DC

SIZE

DATE:

.VER.ONCI

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 1922A

CONVERTER WITH 1.3uA QUIESCENT CURRENT

N/A

LTC3129EUD

J.NOON

01 - 02 - 13

15V, 200mA, SYNCHRONOUS BUCK - BOOST DC / DC

SIZE

DATE:

.VER.ONCI

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 1922A

CONVERTER WITH 1.3uA QUIESCENT CURRENT

N/A

LTC3129EUD

J.NOON

01 - 02 - 13

15V, 200mA, SYNCHRONOUS BUCK - BOOST DC / DC

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION FAB

- 2 01 - 02 - 13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION FAB

- 2 01 - 02 - 13

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

J.NOONPRODUCTION FAB

- 2 01 - 02 - 13

JP2JP2

1uF

25V

1uF

25V

PGOOD

619k

JP3JP3

VOUT

5.0V / 200mA

VOUT

5.0V / 200mA

22uF

10V

1210

22uF

10V

1210

LTC3129EUD

GND

VIN

SW1 16

BST213

FB 7

RUN

VCC

PWM 10

PGND

GND

MPPC

5PGOOD 11

SW2 14

BST11

VOUT 12

NC 8

NC 9

OPT

1uF

25V

1uF

25V

C11

OPT

6.3V

C11

OPT

6.3V

22nF

50V

22nF

50V

OPT

GND

OPT

2.21K

22nF

50V

22nF

50V

ZXMN2F30FH

OPT

VIN

EPL3015-103

JP4JP4

33pF

22uF

25V

1210

22uF

25V

1210

OPT

7343

OPT

7343

C10

10pF

C10

10pF

2.2uF

SMH-106-02-L-D-05

VSUPPLY

1NC 2

GND

3PGOOD 4

KEY

5VBAT 6

RSVD

7EHORBAT 8

I/O 2

9I/O 1 10

+5V

11 V+ 12

GND

JP1JP1

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dc1922af

DEMO MANUAL DC1922A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0513 • 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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