Linear Technology LT3032 User manual

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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

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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
LOAD
V+
–
V+
–
A
–
+
A
–
+
+
V
+
–
A–+
+
V
+
–
A–+
DC1622A F01

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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:
V
OUTP = 1.22 + 2.44/R13 ×RTOP (V)
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

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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

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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
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
A A B B C C D D
OFF
ON
150mA
3.3V
5V
15V
12V
OPT.
1.22V
-150mA
-3.3V
-15V
-12V
-5V
-1.22V
OPT.
OFF
ON
0805 0805
1210 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
1
Tuesday, February 16, 2010
12
K. LAC M. ZHU
A
LT3032IDE
DEMO CIRCUIT 1622A
SIZE DATE:
IC NO. REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
PCB DES.
ENG.
TECHNOLOGY
Fax: [phone] Milpitas, CA 95035 Phone: [phone] 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.
E1
OUTP
C3 10uF 25V
E4
GND
E7
GND
C4 0.01uF 50V
E8
GND
R12 88.7K 1%
R9 274K 1%
J1
OUTP SELECT
1 2
3 4
5 6
7
910
8
11 12
R2 150K 1%
R10 787K 1%
R6 88.7K 1%
E3
GND
R8 150K 1%
JP1
1 2 3
R3 274K 1%
C5 10uF 25V
R11 1M 1%
R13* OPT
R4 787K 1%
R1 OPT
JP2
1 2 3
R7 OPT
E5
OUTN
R5 1M 1%
E6
VINN
J2
OUTN SELECT
1 2
3 4
5 6
7
910
8
11 12
C1 2.2uF 25V C6 2.2uF 25V
C2 0.01uF 50V
E2
VINP
exposed pad solder side solder side exposed pad
U1 LT3032IDE
3
5
2
10
9
1
4
7 11 8
12 14 13
6
BYPP
GND
ADJP
SHDNN
INN
OUTP
GND
OUTN
BYPN
ADJN
SHDNP INP NC INN

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DEMO MANUAL DC1622A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
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
Copyright © 2004, Linear Technology Corporation

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