Linear Technology LT3032 User manual

dc1622af

DEMO MANUAL DC1622A

DESCRIPTION

LT3032: Dual 150mA

Positive/Negative Low Noise

Low Dropout Linear Regulator

Demonstrationcircuit1622Aisadual150mAlinearregula-

tor featuring the LT

3032. The LT3032 is a dual, positive

and negative low dropout linear regulator. Each regulator

supplies upto150mA ofoutput current witha typical300mV

dropout voltage. Each regulator’s quiescent current is low

(<3μA total in shutdown) and well controlled in dropout,

making it an excellent choice for battery-powered circuits.

A 0.01μF bypass capacitorto each regulator reduces output

voltage noise to 20μVRMS (positive regulator)/30μVRMS

(negative regulator) over a 10Hz to 100kHz bandwidth.

The LT3032 is stable with minimum output capacitor of

2.2μF. The regulators do not require any additional ESR.

Internalprotectioncircuitryincludesreverseoutput protec-

tion, current limiting and thermal limiting. Each regulator

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.

PERFORMANCE SUMMARY

is offered as an adjustable output device with an output

voltage range down to the ±1.22V reference voltages.

The LT3032 is available in a unique low profile 14-lead

4mm ×3mm ×0.75mm DFN package with exposed back-

side pads for each regulator.

The LT3032 data sheet gives a complete description of

the part, operation and application information. The data

sheet must be read in conjunction with this quick start

guide for demo circuit 1622A.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITION VALUE

Minimum INP Input Voltage ILOAD = 150mA 2.3V

Minimum INN Input Voltage ILOAD = –150mA –2.3V

Maximum Input Voltage VOUTP = 5V, ILOAD = –150mA 20V

VOUTN = –5V, ILOAD = –90mA –20V

Output Voltage VOUT J1, J2 Shunt in 7, 8 ±4.989V ±3%

Maximum Output Current VINP = 7V, VOUTP = 5V 150mA

VINN = –7V, VOUTN = –5V –150mA

dc1622af

DEMO MANUAL DC1622A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit 1622A is easy to set up to evalu-

ate the performance of the LT3032. Refer to Figure 1 for

proper measurement of the equipment setup and follow

the procedure below:

1. Place JP1 and JP2 on the ON position.

2. Use OUTP and OUTN selection J1, J2 to set the desired

output voltage.

3. With power off, connect the input power supply to ±VIN

and GND.

4. Turn on the power at the input.

Note: Makesure that theinput voltage doesnot exceed ±20V.

5. Check for the proper output voltage.

Note: If there is no output, temporarily disconnect the load

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

6. Once the proper output voltage is established, adjust the

load 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.

LOAD

V+

–

V+

–

A–+

–

A–+

DC1622A F01

dc1622af

DEMO MANUAL DC1622A

TRACKING POWER SUPPLY DESIGN

The demo board can be modified easily into a tracking

supply design. Remove R6, R12 from the board and

solder the resistor R13 onto the board. R13 should be

less than 250k to minimize errors in the resultant output

voltage caused by the ADJP/N pin bias current. The output

voltage is:

OUTP = 1.22 + 2.44/R13 ×RTOP (V)

OUTN = –1.22 – 2.44/R13 ×RBOT (V)

Use a variable resistor in series with a fixed value resistor

if the output voltage is adjustable.

Figure 2. Tracking Power Supply Design

dc1622af

DEMO MANUAL DC1622A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C2, C4 CAP, CHIP X7R, 0.01μF, 50V, 0603 TDK, C1608X7R1H103K

2 2 C1, C6 CAP., CHIP X5R, 2.2μF, 25V, 0805 AVX, 08053C225KAT2A

3 2 C3, C5 CAP., CHIP X7R, 10μF, 25V, 1210 TDK, C3225X7R1E106M

4 2 R2, R8 RES., CHIP 150k 1% 0603 VISHAY, CRCW0603150KFKEA

5 2 R6, R12 RES., CHIP 88.7k 1% 0603 VISHAY, CRCW060388K7FKEA

Additional Demo Board Circuit Components

1 2 R3, R9 RES., CHIP 274k 1% 0603 VISHAY, CRCW0603274KFKEA

2 2 R4, R10 RES., CHIP 787k 1% 0603 VISHAY, CRCW0603787KFKEA

3 2 R5, R11 RES., CHIP 1M 1% 0603 VISHAY, CRCW06031M00FKEA

4 0 R1, R7, R13 OPT.

Hardware: For Demo Board Only

1 8 E1-E8 TURRET, TESTPOINT MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 HEADER, 1X3 PINS, 2MM SAMTEC, TMM-103-02-L-S

3 2 J1-J2 HEADER, 2X6 PINS, 2MM SAMTEC, TMM-106-02-L-D

4 4 JP1, JP2, J1, J2 SHUNT SAMTEC, 2SN-BK-G

dc1622af

DEMO MANUAL DC1622A

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

A A

B B

C C

D D

OFF

150mA

3.3V

15V

12V

OPT.

1.22V

-150mA

-3.3V

-15V

-12V

-5V

-1.22V

OPT.

OFF

0805

1210

2.3V ~ 20V

LOW DROPOUT LINEAR REGULATOR

-2.3V ~ -20V

*SEE QUICK START GUIDE

DUAL 150mA POSITIVE / NEGATIVE LOW NOISE

M. ZHUPRODUCTION1 12-14-09

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

Tuesday, February 16, 2010

K. LAC

M. ZHU

LT3032IDE

DEMO CIRCUIT 1622A

SIZE

DATE:

IC NO. REV

SHEET OF

TITLE:

CONTRACT NO.

APPROVALS

PCB DES.

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.

OUTP

10uF

25V

GND

0.01uF

50V

GND

R12

88.7K

274K

OUTP SELECT

1 2

3 4

5 6

910

11 12

150K

R10

787K

88.7K

GND

150K

JP1

274K

10uF

25V

R11

R13*

OPT

787K

OPT

JP2

OPT

OUTN

VINN

OUTN SELECT

1 2

3 4

5 6

910

11 12

2.2uF

25V

2.2uF

25V

0.01uF

50V

VINP

exposed pad

solder side

exposed pad

LT3032IDE

BYPP

GND

ADJP

SHDNN

INN

OUTP

GND

OUTN

BYPN

ADJN

SHDNP

INP

INN

dc1622af

DEMO MANUAL DC1622A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0211 • 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

X-ON Electronics

Largest Supplier of Electrical and Electronic Components

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