DC1622A - Demo Manual

DEMO MANUAL DC1622A
LT3032: Dual 150mA
Positive/Negative Low Noise
Low Dropout Linear Regulator
DESCRIPTION
Demonstration circuit 1622A is a dual 150mA linear regulator featuring the LT®3032. The LT3032 is a dual, positive
and negative low dropout linear regulator. Each regulator
supplies up to 150mA of output current with a typical 300mV
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 capacitor to 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.
Internal protection circuitry includes reverse output protection, current limiting and thermal limiting. Each regulator
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 backside 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
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
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
1
DEMO MANUAL DC1622A
QUICK START PROCEDURE
Note: Make sure that the input voltage does not exceed ±20V.
Demonstration circuit 1622A is easy to set up to evaluate the performance of the LT3032. Refer to Figure 1 for
proper measurement of the equipment setup and follow
the procedure below:
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.
1. Place JP1 and JP2 on the ON position.
2. Use OUTP and OUTN selection J1, J2 to set the desired
output voltage.
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.
3. With power off, connect the input power supply to ±VIN
and GND.
Note: Make sure that the power dissipation is limited below
the thermal limit.
4. Turn on the power at the input.
LOAD
–
A
+
+
V
–
–
V
+
+
–
–
A
A
+
+
+
V
+
–
DC1622A F01
+
+
V
–
A
–
LOAD
Figure 1. Proper Measurement Equipment Setup
dc1622af
2
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:
VOUTP = 1.22 + 2.44/R13 × RTOP (V)
VOUTN = –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
3
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
4
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
D
C
B
1
GND
VINN
-2.3V ~ -20V
GND
VINP
2.3V ~ 20V
E8
E6
E3
E2
2
C6
2.2uF
25V
0805
C1
2.2uF
25V
0805
2
OFF
ON
OFF
ON
exposed pad
solder side
exposed pad
solder side
ADJN
BYPN
OUTN
ADJP
8
11
7
2
3
1
C4
0.01uF
50V
C2
0.01uF
50V
R8
150K
1%
3
4
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
ENG.
5
PCB DES.
M. ZHU
K. LAC
R3
274K
1%
1
R9
274K
1%
R10
787K
1%
DATE:
A
SIZE
R11
1M
1%
7
6
GND
OUTP
150mA
E7
C5
10uF
25V
1210
GND
OUTN
-150mA
DATE
12-14-09
DEMO CIRCUIT 1622A
LT3032IDE
7
SHEET
LOW DROPOUT LINEAR REGULATOR
8
1 OF 2
1
REV
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
R12
88.7K
1%
E5
8
DUAL 150mA POSITIVE / NEGATIVE LOW NOISE
TECHNOLOGY
E4
C3
10uF
25V
1210
E1
M. ZHU
APPROVED
*SEE QUICK START GUIDE
R13*
OPT
R6
88.7K
1%
PRODUCTION
DESCRIPTION
REVISION HISTORY
Tuesday, February 16, 2010
IC NO.
R5
1M
1%
REV
R4
787K
1%
ECO
6
TITLE: SCHEMATIC
J2
OUTN SELECT
R7
OPT
J1
OUTP SELECT
APPROVALS
GND
SHDNN
INN
INN
GND
SHDNP
BYPP
OUTP
R2
150K
1%
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.
5
10
9
6
4
12
NC
INP
R1
OPT
5
CONTRACT NO.
1
2
3
1
2
3
13
14
U1
LT3032IDE
4
CUSTOMER NOTICE
JP2
JP1
3
2
4
6
8
10
12
1
3
5
7
9
11
2
4
6
8
10
12
1
3
5
7
9
11
1.22V
OPT.
3.3V
5V
12V
15V
-1.22V
OPT.
-3.3V
-5V
-12V
-15V
A
1
D
C
B
A
DEMO MANUAL DC1622A
SCHEMATIC DIAGRAM
dc1622af
5
DEMO MANUAL DC1622A
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 application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
dc1622af
6
Linear Technology Corporation
LT 0211 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
Similar pages