Linear Technology DC1865A Quick setup guide

dc1865af

DEMO MANUAL DC1865A

Description

LT3055

500mA, Linear Regulator with

Precision Current Limit and Diagnostics

Demonstrationcircuit1865Aisanadjustable500mAlinear

regulator featuring LT

3055. LT3055 is a micropower, low

noise and low dropout voltage linear regulator. The device

supplies 500mA of output current with a dropout voltage

of 350mV. A 10nF bypass capacitor reduces output noise

to 25µVRMS in a 10Hz to 100kHz bandwidth and soft-starts

the reference. The LT3055’s ±45V input voltage rating

combined with its precision current limit and diagnostic

functions make the IC an ideal choice for robust, high

reliability applications.

LT3055 current limit can be programmed by a single

resistor, accurate to ±10% over a wide input voltage

and temperature range. Another resistor programs the

LT3055’s minimum output current monitor, useful for

detectingopen-circuitconditions.The internal current limit

should be considered when the input-to-output differential

is high. The current monitor function sources a current

equal to 1/500th of output current. See the Operation sec- 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

tion in the data sheet for a detailed calculation. Logic fault

pins assert low if the LT3055 is in current limit (FAULT2),

operating below its minimum output current (FAULT1)

or is in thermal limit (both FAULT1 and FAULT2). The die

temperature is indicated by the TEMP pin.

LT3055 optimizes stability and transient response with a

low ESR ceramic capacitor, requiring a minimum of 3.3µF.

The LT3055 is available in the thermally-enhanced 16-lead

4mm × 3mm DFN and MSOP packages.

The LT3055 data sheet gives a complete description of

the device, operation and application information. The

data sheet must be read in conjunction with this quick

start guide for DC1865.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1865A

PARAMETER CONDITIONS VALUE

Minimum Input Voltage (Max) VOUT = 5V, IOUT = 500mA 5.6V

Maximum Input Voltage VOUT = 5V 45V

Output Voltage VOUT Header in JP1

Header in JP2

Header in JP3

Header in JP4

Header in JP5

Header in JP6

1.20V ±3%

1.50V ±3%

1.80V ±3%

2.50V ±3%

3.32V ±3%

4.99V ±3%

Maximum Output Current (Typ) VIN = 12V, VOUT = 5V, R10 = 604Ω 500mA

Minimum Output Current (Typ) VIN = 12V, VOUT = 5V, R9 = 121kΩ 10mA

IMON Voltage (to µP ADC) (Typ) VIN = 12V, VOUT = 5V, R8 = 1k, IOUT = 500mA 1V

Temp voltage (Typ) VIN = 12V, VOUT = 5V 0.25V

Specifications are at TA= 25°C

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dc1865af

DEMO MANUAL DC1865A

Quick start proceDure

DC1865A is easy to set up to evaluate the performance

of the LT3055. Refer to Figure 1 for proper measurement

equipment setup and follow the procedure below:

NOTE:Makesurethattheinputvoltagedoes not exceed 45V.

NOTE: The shutdown jumper JP8 shunt is required to be

placed in the OFF or ON position for proper operation.

NOTE: Place the output voltage selection jumper JP1-JP7

at the desired position.

NOTE: Do not hot-plug the input voltage terminal VIN. The

absolute maximum voltage on VIN is 50V and hot-plugging

a power supply through wire leads to the demonstration

circuit can cause the voltage on the extremely low-ESR

ceramic input capacitor to ring to twice its DC value. In

order to protect the IC, a higher ESR Aluminum Electro-

lytic capacitor is placed at the input terminals. This may

protect against some, but not all, input transients due to

hot-plugging with a power supply. See Application Note

88 for more details.

NOTE: Connect the power supply (with power off), load,

and meters as shown in Figure 1.

1. After all connections are made, turn on input power and

verify that the output voltage according to the output

voltageselectionjumper(JP1-JP7).If theoutputvoltage

is different from the above values, use the USER option

and install R7. Select R7 according to the following

equation:

R7 = (VOUT/0.6 – 1) • 60.4k

NOTE: If the output voltage is too low, temporarily

disconnect the load to make sure that the load is not

set too high.

2. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, FAULT1, FAULT2, PWRGD

and other parameters.

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dc1865af

DEMO MANUAL DC1865A

Quick start proceDure

Figure 1. Proper Measurement Equipment Setup

Figure 2. Measuring Input or Output Ripple

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dc1865af

DEMO MANUAL DC1865A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C8 Cap., X7R, 0.01µF, 16V, 10% 0603 AVX, 0603YC103KAT2A

2 2 C2, C3 Cap., X5R, 0.1µF, 16V, 20% 0402 AVX, 0402YD104MAT2A

3 1 C4 Cap., X7R, 22nF, 16V, 10% 0402 AVX, 0402YC223KAT2A

4 2 C5, C6 Cap., X7R, 10µF, 50V, 10% 1210 TAIYO YUDEN, UMK325AB7106KM-T

5 1 C9 Cap., X7R, 100pF, 16V, 10% 0402 AVX, 0402YC101KAT2A

6 2 R1, R12 Res., Chip, 60.4k, 0.06W, 1% 0402 VISHAY, CRCW040260K4FKED

7 1 R2 Res., Chip, 90.9k, 0.06W, 1% 0402 VISHAY, CRCW040290K9FKED

8 1 R3 Res., Chip, 121k, 0.06W, 1% 0402 VISHAY, CRCW0402121KFKED

9 1 R4 Res., Chip, 191k, 0.06W, 1% 0402 VISHAY, CRCW0402191KFKED

10 1 R5 Res., Chip, 274k, 0.06W, 1% 0402 VISHAY, CRCW0402274KFKED

11 1 R6 Res., Chip, 442k, 0.06W, 1% 0402 VISHAY, CRCW0402442KFKED

12 1 R8 Res., Chip, 1.00k, 0.1W, 1% 0603 VISHAY, CRCW06031K00FKEA

13 1 R9 Res., Chip, 121k, 0.1W, 1% 0603 VISHAY, CRCW0603121KFKEA

14 1 R10 Res., Chip, 604Ω, 0.1W, 1% 0603 VISHAY, CRCW0603604RFKEA

15 3 R11, R13, R14 Res., Chip, 499k, 0.1W, 1% 0603 VISHAY, CRCW0603499KFKEA

16 1 U1 I.C., Volt. Reg., DFN-16 (4×3) LINEAR TECH., LT3055EDE#PBF

Additional Demo Board Circuit Components

1 1 CIN Cap., Alum., 22µF, 50V, 6.3mm × 5.4mm SUN SELECT, 50CE22BSS

2 0 C7 (OPT) Cap., D Case

3 0 R7 (OPT) Res., 0603

Hardware-For Demo Board Only

1 9 E1-E9 Turret, Testpoint 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

2 7 JP1-JP7 Headers, 2 Pins 2mm Ctrs. SAMTEC, TMM-102-02-L-S

3 1 JP8 Headers, Single Row 3 Pins 2mm Ctrs. SAMTEC, TMM-103-02-L-S

4 2 XJP6, XJP8 Shunt, 2mm Ctrs. SAMTEC, 2SN-BK-G

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dc1865af

DEMO MANUAL DC1865A

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

1. ALL RESISTORS ARE 0402.

ALL CAPACITORS ARE 0402.

NOTE: UNLESS OTHERWISE SPECIFIED

0.01uF

0603

0.01uF

0603

R10

604

0603

R10

604

0603

JP5

3.3V

JP5

3.3V

JP2

1.5V

JP2

1.5V

191K

JP6

GND

PWRGD

10uF

50V

1210

10uF

50V

1210

JP7

USER SELECT

JP7

USER SELECT

274K

R12

60.4K

R12

60.4K

442K

1.00K

1% 0603

1.00K

1% 0603

0.1nF

JP1

1.2V

JP1

1.2V

90.9K

TEMP

IMON

R13

499K

0603

R13

499K

0603

121k

0603

121k

0603

E4 GND

121K

VOUT

500mA

VOUT

500mA

FAULT1

0.01uF

0603

0.01uF

0603

OPT

0603

OPT

0603

10uF

50V

1210

10uF

50V

1210

R11

499K

0603

R11

499K

0603

60.4K

JP8

OFF

SHDN

JP8

OFF

SHDN

LT3055EDE

REF/BYP

IMIN

IMON

FAULT1

GND

SHDN

OUT

ADJ

GND

IMAX

FAULT2

PWRGD

TEMP

GND

22nF

JP3

1.8V

JP3

1.8V

0.1uF

OPT

"D" Case

OPT

"D" Case

FAULT2

VIN

2.2V - 45V E1

VIN

2.2V - 45V

0.1uF

CIN

22uF

50V

CIN

22uF

50V

R14

499K

0603

R14

499K

0603

JP4

2.5V

JP4

2.5V

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dc1865af

DEMO MANUAL DC1865A

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 0613 • 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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