Linear Technology DC1667A Guida rapida alla configurazione

dc1667afa

DEMO MANUAL DC1667A

DESCRIPTION

LTC3600

16V, 1.5A Synchronous

Step-Down Regulator with

Programmable Reference

Demonstration circuit DC1667A is a step-down DC/

DC converter using LT C

3600 monolithic synchronous

buck regulator. DC1667A has an input voltage range of

4.5V to 15V, and is capable of delivering up to 1.5A of

output current. The output voltage of the DC1667 can be

set by a single resistor from 0V to (VIN – 0.5)V. At light

load conditions, DC1667 can operate in discontinuous

mode to improve the efficiency. During shutdown mode,

LTC3600consumeslessthan1µA.Theswitchingfrequency

of LTC3600 is programmable from 200kHz to 4MHz.

DC1667A uses low profile surface mount components.

PERFORMANCE SUMMARY

These features and the availability of LTC3600 in a 12-lead

DFN/MSOP package, make it ideal for use in point-of-load

power supplies, battery-powered equipments and voltage

tracking systems. The LTC3600 data sheet must be read

in conjunction with this demo manual for working on or

modifying the demo circuit DC1667A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1667A

L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

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

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Input Voltage Range 4.5V to 15V

Default Output Voltage VOUT VIN = 4.5V to 15V, IOUT = 0A to 1.5A, JP10: CCM 1.215V ± 2% (1.19V to 1.24V)

Maximum Continuous Output Current 1.5A

Default Operating Frequency 1MHz

Typical Output Voltage Ripple VIN = 5V, VOUT = 1.2V, IOUT = 1.5A, fSW = 1MHz <10mV (See Figure 4)

Efficiency VIN = 5V, VOUT = 1.2V, IOUT = 1.5A, fSW = 1MHz 78% (See Figure 3)

dc1667afa

DEMO MANUAL DC1667A

QUICK START PROCEDURE

Figure 1. Proper Equipment Measurement Setup

Demonstration circuitDC1667Aiseasy to setup to evaluate

the performance of the LTC3600. Please refer to Figure 1

for proper measurement equipment setup and follow the

procedure below:

1. Place jumpers in the following positions for a typical

1.2V output application:

JP2 JP7 JP8 JP9 JP10

1.2V COMP PGOOD RUN MODE/SYNC

1.2V EXT DIS OFF CCM

2. With power off, connect the input power supply, load

and meters as shown in Figure 1. Preset the load to 0A

and VIN supply to 5V.

3. Turn on the power supply at the input. Measure and

make sure the input voltage is 5V. Turn on the circuit

by inserting the shunt in header JP9 to the ON position.

The output voltage should be 1.215V± 2% (1.19V to

1.24V).

4. Oncethe properoutput voltage is established, adjust the

load within the operating range and observe the output

voltage regulation, output voltage ripple, efficiency and

other parameters. Refer to Figure 2 for proper input/

output voltage ripple measurement.

5. To select other output voltages, LTC3600 has to be shut

down by putting RUN pin jumper to the OFF position or

turning off the input supply. After the IC is shut down,

move the shunt to other output voltage selections, such

as 1.8V or 3.3V, and repeat tests 1 through 4. The output

voltage tolerance should remain at VOUT ± 2%.

VIN

4.5V TO 15V

+–

–+

–

+–

VOUT

LOAD (0A TO 1.5A)

DC1667A F01

INPUT OR OUTPUT CAPACITOR

Figure 2. Scope Probe Placements for Measuring Input or Output Ripple

dc1667afa

DEMO MANUAL DC1667A

QUICK START PROCEDURE

Figure 3. Measured Efficiency (VOUT = 1.2V)

LOAD CURRENT (A)

0.01

EFFICIENCY (%)

100

DC1667A F03

0.1

5VIN, 1.2VOUT DCM

12VIN, 1.2VOUT DCM

5VIN, 1.2VOUT CCM

12VIN, 1.2VOUT CCM

1µs/DIV DC1667A F04

20MHz BW LIMIT

SWITCHING NODE

VOUT

10mV/DIV

5V/DIV

Figure 4. Measured Output Voltage Ripple at 5V Input,

1.2V Output, 1.5A with Standard Demo Circuit Default Setup

dc1667afa

DEMO MANUAL DC1667A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN2 Capacitor, X5R 22µF 16V 20% 1210 TDK C3225X5R1C226M

2 1 COUT1 Capacitor, X5R 47µF 6.3V 20% 1210 Taiyo Yuden JMK325BJ476MM-T

3 1 C3 Capacitor, X5R 4.7µF 16V 20% 0805 Taiyo Yuden EMK212BJ475MG

4 1 C4 Capacitor, X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A

5 1 L1 Inductor, 2.2µH IHLP-2020CZ-01 Vishay IHLP-2020CZ-ER 2R2M01

6 1 R2 Resistor, Chip 24.3K 0.06W 1% 0603 Vishay CRCW060324K3FKEA

7 1 R9 Resistor, Chip 36.5K 0.06W 1% 0402 Vishay CRCW040236K5FKED

8 1 U1 I.C., Voltage Regulator DFN(12)(DD) 3mm × 3mm Linear Technology Corporation LTC3600EDD

Additional Demo Board Circuit Components

1 1 CIN1 Capacitor, Tantalum 3.3µF 35V 20% 6032 AVX TAJW335M035R

2 1 CIN3 Capacitor, X5R 22µF 16V 20% 1210 TDK C3225X5R1C226M

3 2 COUT2, COUT3 Capacitor, 1210

4 1 C1 Capacitor, NPO 68pF 50V 10% 0603 AVX 06035A680KAT1A

5 1 C2 Capacitor, 0402

6 1 C5 Capacitor, X7R 0.01µF 16V 20% 0402 AVX 0402YC103MAT2A

7 1 C6 Capacitor, 0805

8 1 RSD Resistor, Chip 1M 0.06W 5% 0603 Vishay CRCW06031M00JNEA

9 1 R1 Resistor, Chip 16.2k 0.06W 1% 0603 Vishay CRCW060316K2FKEA

10 1 R3 Resistor, Chip 35K7 0.06W 1% 0603 Vishay CRCW060335K7FKEA

11 1 R4 Resistor, Chip 66.5k 0.06W 1% 0603 Vishay CRCW060366K5FKEA

12 1 R5 Resistor, 0603

13 1 R6 Resistor, Chip 56k 0.06W 5% 0603 Vishay CRCW060356K0JKEA

14 1 R7 Resistor, Chip 100k 0.06W 5% 0603 Vishay CRCW0603100KJNEA

15 1 R8 Resistor, 0402

16 2 R10, R11 Resistor, 0603

17 1 R12 Resistor/Jumper, Chip 0Ω 1/8W 1A 0805 Vishay CRCW08050000ZOEA

Hardware-For Demo Board Only

1 7 E1-E7 Turret, Testpoint .062 Thick Board Mill Max 2501-2-00-80-00-00-07-0

2 4 JP1–JP3, JP5 Jumper, 2 Pins 2mm Ctrs. Samtec TMM-102-02-L-S

3 1 JP6 Samtec TMM-102-02-L-S

4 3 JP7–JP9 Headers, Single Row 3 Pins 2mm Ctrs. Samtec TMM-103-02-L-S

5 1 JP10 Headers, Double Row 2mm × 3 2mm Ctrs. Samtec TMM-103-02-L-D

6 5 XJP2, XJP7–XJP10 Shunt, 2mm Ctrs. Samtec 2SN-BK-G

7 1 Stencil Stencil DC1667A

dc1667afa

DEMO MANUAL DC1667A

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

4 4

3 3

2 2

1 1

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





  

INTVCC

VOUT

INTVCC

VIN

INTVCC

VOUT

VIN

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

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 

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

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 

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV



 

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY











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







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





JEFF Z.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY



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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







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





JEFF Z.

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY



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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















JEFF Z.

NOTE: UNLESS OTHERWISE SPECIFIED.

1. ALL RESISTORS 0402.

2. ALL CAPACITORS 0402.

NOTE: UNLESS OTHERWISE SPECIFIED.

1. ALL RESISTORS 0402.

2. ALL CAPACITORS 0402.

NOTE: UNLESS OTHERWISE SPECIFIED.

1. ALL RESISTORS 0402.

2. ALL CAPACITORS 0402.









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

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

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

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









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









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

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

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



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

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

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







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dc1667afa

DEMO MANUAL DC1667A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2011

LT 1214 REV A • 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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1667A

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