Linear Technology DC1883A Quick setup guide

dc1883Af

DEMO MANUAL DC1883A

Description

LTC3103EDD

1.8µA Quiescent Current, 15V,

300mA Synchronous Step-Down

DC/DC Converter

DemonstrationCircuit1883AfeaturestheLTC

3103, a high

efficiency, monolithic synchronous step-down converter

using a current mode architecture capable of supplying

300mA of output current. The IC operates with a fixed

frequency oscillator at 1.2MHz.

The LTC3103 has two user selectable (JP2) operating

modes: Burst Mode

operation and forced continuous

operation (fixed frequency PWM). The IC has internal

compensation and an accurate programmable RUN pin.

The LTC3103 operates with a 2.5V to 15V input voltage

range. The demo board has been designed with a main

output set to 1.8V. Since the LTC3103 is a buck converter,

as VIN approaches VOUT, the output will start dropping out

of regulation. Consult the data sheet for information on

the minimum VIN to VOUT differential for regulation. The

regulation range is also a function of the load current.

Typical demo board efficiency is shown in Figures 1 and 2.

The LTC3103 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

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

(TA= 25°C)

PARAMETER CONDITIONS TYPICAL VALUE

Input Voltage Range (See Note 1) 2.5V to 15V

VOUT (See Note 1) 1.8V

IOUT 300mA

Note 1. The demo board can operate with VIN less than VOUT, however VOUT will drop out of regulation. The regulation range is a function of IOUT. Please

refer to the data sheet for more information.

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dc1883Af

DEMO MANUAL DC1883A

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

battery/power supply (PS1) should not be connected to

the circuit until it is stated in the following procedure.

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) = OFF

JP2 (MODE) = FIXED FREQUENCY

2. With power off, connect the power supply (PS1) as

shown in Figure 3. If accurate current measurements

are desired (for efficiency calculation for example),

then connect an ammeter in series with the supply as

shown. The ammeter is not required, however.

3. Connect a load to VOUT, as shown in Figure 3. The load

can be up to 300mA or 6Ω for VOUT = 1.8V. Connect an

ammeter if accuratecurrentmeasurementormonitoring

is desired.

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

age at VIN is 5V. Move Jumper JP1 to ON.

5. Verify VOUT is ~1.8V.

6. VIN can now be varied between 3V and 15V. VOUT should

remain in regulation.

7. VIN can also be varied down to 2.5V. For VIN ≤ 3V,

VOUT may drop out of regulation, as previously de-

scribed.

8. IOUT can also be varied from 0mA to 300mA.

9. For Burst Mode operation, move jumper JP2 to BURST.

See the data sheet for more information.

NOTES:

(1) If VOUT drops out of regulation, check to be sure

themaximumloadhasnotbeenexceeded,orthatVIN is

not below the minimum value for regulation (see

the data sheet).

(2) To measure no-load input current, remove R4.

VIN (V)

EFFICIENCY (%)

100

711 13

5915

dc1883a F01

300mA LOAD

100mA LOAD

VIN (V)

EFFICIENCY (%)

100

711 13

5915

dc1883a F02

5mA LOAD

1mA LOAD

10mA LOAD

Figure 1. DC1883A Efficiency in PWM Mode Figure 2. DC1883A Efficiency in Burst Mode Operation

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dc1883Af

DEMO MANUAL DC1883A

Quick start proceDure

Figure 3. Proper Measurement Equipment Setup

Figure 4. Measuring Input or Output Ripple

GND

VIN

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dc1883Af

DEMO MANUAL DC1883A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP CER, 10µF, 25V, X5R, 1210 TDK, C3225X5R1E106M

2 3 C2, C4, C6 CAP CER, 1µF, 25V, X5R, 0603 TDK, C1608X5R1E105M

3 1 C3 CAP CER, 22µF, 10V, X5R, 20%, 1206 TDK, C3216X5R1A226M

4 1 C7 CAP CER, 12pF, 50V, C0G 5%, 0603 TDK, C1608C0G1H120J

5 1 C8 CAP CER, 0.1µF, 50V, X7R, 0603 TDK, C1608X7R1H104M

6 1 L1 Inductor, 15µH Coilcraft, LPS4018-153MLB

7 1 R1 RES, 2MΩ, 1/10W, 1%, 0402, SMD Panasonic, ERJ-2GEJ205X

8 1 R2 RES, 2.21kΩ, 1/10W, 1%, 0402, SMD Panasonic, ERJ-2RKF2211X

9 4 R3, R4, R5, R6 RES, 1MΩ, 1/10W, 1%, 0402, SMD Panasonic, ERJ2RKF1004X

10 1 U1 LTC3103EDD Linear Technology Corporation, LTC3103EDD

Additional Demo Board Circuit Components

1 0 C5 (OPT) CAP CER, 1000pF, 50V, X7R, 20%, 0603 OPT

2 0 C9 (OPT) OPT CAP TANT, 68µF, 20V, 10%, SMD, 7343 OPT

3 0 R9 OPT RES, 1/10W, 1%, 0402, SMD OPT

Hardware—for Demo Board Only

1 5 E1, E2, E3, E4, E5 Testpoint, Turret 0.094" Mill-Max, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 JMP, 0.079” Single Row Header, 30-Pin Samtec, TMM-103-02-L-S

3 2 XJP1, XJP2 Shunt, 0.079" Center Samtec, 2SN-BK-G

4 4 (Stand-Offs) Stand-Off, Nylon, 0.375" Tall Keystone, 8832 (Snap on)

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dc1883Af

DEMO MANUAL DC1883A

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

Figure 5. Circuit Schematic

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dc1883Af

DEMO MANUAL DC1883A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1211 • 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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