Linear Technology DC1729A Quick setup guide

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DEMO MANUAL DC1729A

DESCRIPTION

LT3086

40V, 2.1A Low Dropout Adjustable

Linear Regulator with Monitoring

and Cable Drop Compensation

Demonstration circuit 1729A is a 2.1A low dropout adjust-

able linear regulator featuring the LT

3086. The device is

designed with multiple features and operates over a wide

1.4V to 40V input supply range. The LT3086 requires only

one resistor to set the output voltage from 0.4V to 32V

and it is stable with ceramic output capacitors requiring

a minimum of 10μF.

The key features of the LT3086 include programmable

cable drop compensation, master/slave configuration for

paralleling of multiple devices for higher load current and

heat spreading, output current and temperature monitor-

ing, and programmable power good flag.

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

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

PERFORMANCE SUMMARY

The LT3086 is offered in the packages of 16-lead DFN,

16-lead TSSOP, 7-lead DD-PAK, and a 7-lead TO-220.

The LT3086 data sheet gives a complete description of

the device, operation and application information. The data

sheet should be read in conjunction with this quick start

guide for working on or modifying the demo circuit 1729A.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range VOUT = 1V, IOUT1 = 1mA 1.55 40 V

VOUT Output Voltage Shunt at 1, 2 for JP1 0.97 1 1.03 V

Shunt at 3, 4 for JP1 1.164 1.2 1.236 V

Shunt at 5, 6 for JP1 1.455 1.5 1.545 V

Shunt at 7, 8 for JP1 3.201 3.3 3.399 V

Shunt at 9, 10 for JP1 4.85 5 5.15 V

Shunt at 11, 12 for JP1 and R10 Stuffed as 232k 11.64 12 12.36 V

IOUT Maximum Output Current (Note 1) 2.1 A

Note 1: The maximum output current 2.1A is when the internal current

limit is active and when VIN-VOUT is smaller than 9V. For the maximum

output current under other conditions, please refer to the data sheet.

dc1729af

DEMO MANUAL DC1729A

QUICK START PROCEDURE

Figure 2. Measuring Input or Output Ripple

Figure 1. DC1729A Proper Equipment Setup

Demonstration circuit 1729A is easy to set up to evalu-

ate the performance of the LT3086. Refer to Figure 1 for

proper measurement equipment setup and follow the

procedure below:

Note: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the ter-

minals of the input or output capacitors. See Figure 2 for

proper scope probe technique.

1. Use JP1 to set the desired output voltage.

2. With power off, connect the input power supply to VIN

and GND.

3. Turn on the power at the VIN.

Note: Make sure that the VIN voltage does not exceed 40V.

4. Check for the proper output voltages:

Note: If there is no output, temporarily disconnect the

load to make sure that the load is not set too high or

is shorted.

5. Once the proper output voltages are established, adjust

the loads within the operating range and observe

the output voltage regulation, efficiency and other

parameters.

Note: Make sure that the power dissipation is limited

below the thermal limit.

GNDVIN OR VOUT

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DEMO MANUAL DC1729A

THERMAL IMAGE

An example thermal image shows the temperature distri-

bution on the board. The test is done in still air at room

temperature with 2.2W power dissipation in the LT3086.

This gives the IC case-to-ambient thermal resistance

θJA = 23°C/W on the demo board.

Figure 3. Temperature Rise at 2.2W Dissipation

The cable drop compensation on the DC1729A can be

turned on by placing R4 (RCDC) with a value which is gov-

erned by the following equation provided in the data sheet:

RCDC =

MON

•R

SET

3000 •R

WIRE

Pleasenotethatwhencable drop compensationis activated,

it also changes the power good threshold. R23 needs to

be the same value as R4 in order to keep the same output

voltage power good threshold at the load.

CABLE DROP COMPENSATION

POWER GOOD SETTING

The power good setting jumper JP2 on the DC1729A is

used for setting the power good threshold for the cor-

responding output voltages. JP2 needs to be configured

at the same position as JP1 for any specific output volt-

ages. For example, when JP1 is configured on 7 and 8 for

3.3VOUT, JP2 also needs to be configured on 7 and 8 for

the correct power good setting for 3.3VOUT.

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DEMO MANUAL DC1729A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., X7R, 10µF 50V, 10%, 1210 MURATA, GRM32ER71H106KA12L

2 1 C2 CAP., X5R, 22µF 16V, 10%, 1206 AVX, 1206YD226KAT2A

3 1 C3 CAP., X7R, 10nF 25V, 10%, 0603 AVX, 06033C103KAT2A

4 2 R1, R12 RES., CHIP, 100k, 1/16W, 1% 0603 VISHAY, CRCW0603100KFKEA

5 1 R3 RES., CHIP, 357Ω, 1/16W, 1% 0603 VISHAY, CRCW0603357RFKEA

6 1 R5 RES., CHIP, 12.1k, 1/16W, 1% 0603 VISHAY, CRCW060312K1FKEA

7 1 R6 RES., CHIP, 16.2k, 1/16W, 1% 0603 VISHAY, CRCW060316K2FKEA

8 1 R7 RES., CHIP, 22.1k, 1/16W, 1% 0603 VISHAY, CRCW060322K1FKEA

9 1 R8 RES., CHIP, 57.6k, 1/16W, 1% 0603 VISHAY, CRCW060357K6FKEA

10 1 R9 RES., CHIP, 90.9k, 1/16W, 1% 0603 VISHAY, CRCW060390K9FKEA

11 1 R14 RES., CHIP, 82.5k, 1/16W, 1% 0603 VISHAY, CRCW060382K5FKEA

12 1 R15 RES., CHIP, 51.1k, 1/16W, 1% 0603 VISHAY, CRCW060351K1FKEA

13 1 R16 RES., CHIP, 19.1k, 1/16W, 1% 0603 VISHAY, CRCW060319K1FKEA

14 1 R17 RES., CHIP, 13.7k, 1/16W, 1% 0603 VISHAY, CRCW060313K7FKEA

15 1 R18 RES., CHIP, 10k, 1/16W, 1% 0603 NIC, NRC06F1002TRF

16 1 R20 RES., CHIP, 1.1k, 1/16W, 1% 0603 VISHAY, CRCW06031K10FKEA

17 1 U1 I.C., LT3086EFE, TSSOP16EFE-BB LINEAR TECH., LT3086EFE

Additional Demo Board Circuit Components

1 0 C4 CAP., OPT 0603

2 1 C5 CAP., SMT, 10µF 50V, 50CE10BSS SANYO, 50CE10BSS

3 0 R2, R4, R10, R11, R13, R19, R21, R23 RES., CHIP, OPT 0603 OPT

4 0 R22 RES., CHIP, OPT 0805 OPT

Hardware-For Demo Board Only

1 9 E1, E2, E3, E4, E5, E6, E7, E8, E9 TP, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 JMP, 2X6, 0.079" SULLINS, NRPN062PAEN-RC

3 1 JP3 JMP, 1X2, 0.079" SULLINS, NRPN021PAEN-RC

4 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

dc1729af

DEMO MANUAL DC1729A

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

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









  

















 

 









TECHNOLOGY











































  















  











  











  



















 



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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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







dc1729af

DEMO MANUAL DC1729A

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 1113 • 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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