DC2246A - Demo Manual

DEMO MANUAL DC2246A
LT3042EDD
20V, 200mA, Ultralow Noise
Ultrahigh PSRR RF LDO Regulator
Description
DC2246A is a linear regulator featuring the LT®3042EDD,
which is a 200mA, ultralow noise, and ultrahigh power
supply rejection ratio (PSRR) RF low dropout (LDO) linear
regulator with programmable current limit.
DC2246A operates over an input range of 3.8V to 20V.
The LT3042 has a maximum output current of 200mA. It
features ultralow noise (0.8µVrms from 10Hz to 100kHz)
and very high PSRR (79dB at 1MHz). The power good
feedback (PGFB) pin voltage is programmable for power
good threshold. A current limit function is provided. Current
monitoring is also achievable by sensing the voltage of ILIM.
Built-in protection includes reverse battery protection,
reverse current protection, internal current limit with
foldback and thermal limit with hysteresis.
Performance Summary
The LT3042 data sheet gives a complete description of the
device, operation and applications information. The data
sheet must be read in conjunction with this Demo Manual
for demonstration circuit DC2246A. The LT3042EDD is
assembled in a 10-lead (3mm x 3mm) plastic DFN package with an exposed pad on the bottom-side of the IC.
Proper board layout is essential for maximum thermal
performance and ultrahigh PSRR.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2246A
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.
Specifications are at TA = 25°C
PARAMETER
CONDITIONS
MIN
Input Voltage Range (VIN)
VOUT = 3.3V
3.8
Shutdown Input Current (IIN)
JP1 = OFF, VIN = 6V
Output Voltage (VOUT)
VIN = 5V, IOUT = 200mA
Output Current Range (IOUT)
VIN = 3.8V~19.7V, VOUT = 3.3V
Output Current Range (IOUT)
VIN = 3.8V~20V, VOUT = 3.3V
TYP
MAX
20
0.1
3.2
3.3
UNITS
V
µA
3.4
V
0
200
mA
0
195*
mA
* Please refer to the Current Limit vs. Input-to-Output Differential in the LT3042 data sheet.
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DEMO MANUAL DC2246A
Board Photo
2
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DEMO MANUAL DC2246A
Quick Start Procedure
The DC2246A is easy to set up to evaluate the performance
of the LT3042EDD. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below:
4. Turn the input power supply on and make sure the
voltage is between 3.8V and 20V.
5. R6 and R7 can define an accurate undervoltage lockout
(UVLO) threshold when the shunt of JP1 is in the USER
SELECT position.
1. Connect Load between the VOUT and GND terminals.
2. With power off, connect the input power supply to the
VIN and GND terminals.
6. Please refer to Application Note 70 for more precise
techniques for measuring the output noise.
3. Make sure the shunt of JP1 is in the ON position.
* J1 AND J2 ARE THE BNC
CONNECTORS TO COAXIAL CABLE
FOR NOISE MEASUREMENT. PLEASE
REFER TO AN70 APPENDIX B FOR
DETAILS.
POWER
SUPPLY
–
–
–
VOUT
VIN
+
+
+
LOAD
+
+
–
IIN
–
IOUT
* THE MAXIMUM OUTPUT CURRENT
DECREASES FROM 200mA TO
195mA AT VIN = 20V.
+
–
Figure 1. Test Procedure Setup Drawing for DC2246A
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DEMO MANUAL DC2246A
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Required Circuit Components
1
1
CIN
CAP., ALUM, 10µF, 50V, 5X5.4MM
SUN SELECT., 50CE10BSS
2
1
C1
CAP., X7R, 4.7µF, 50V, 10% 1206
MURATA, GRM31CR71H475KA12L
3
2
C2, C3
CAP., X7R, 4.7µF, 25V, 10% 1206
MURATA, GRM31CR71E475KA88L
4
1
R1
RES., CHIP, 200k, 1/16W, 5% 0805
VISHAY, CRCW0805200KJNEA
5
1
R2
RES., CHIP, 33.2k, 1/8W, 1% 1206
NIC, NRC12F3322TRF
6
1
R3
RES., CHIP, 453k, 1/8W, 1% 0805
VISHAY, CRCW0805453KFKEA
7
1
R4
RES., CHIP, 49.9k, 1/8W, 1% 0805
VISHAY, CRCW080549K9FKEA
8
1
R5
RES., CHIP, 510Ω, 1/16W, 5% 0805
VISHAY, CRCW0805510RJNEA
9
1
U1
IC, LT3042EDD, DFN 3X3mm
LINEAR TECH., LT3042EDD#PBF
Optional Electronic Components
1
0
C4 (OPT)
CAP., 1206
2
0
C5, C6 (OPT)
CAP., 0603
3
0
R6, R7 (OPT)
RES., 0402
Hardware: For Demo Board Only
1
6
E1–E6
TESTPOINT, TURRET, 0.094" PBF
MILL-MAX, 2501-2-00-80-00-00-07-0
2
1
JP1
HEADER 3 PIN 0.079 DOUBLE ROW
WÜRTH ELEKTRONIK, 620 006 211 21
3
1
XJP1
SHUNT, 0.079" CENTER
WÜRTH ELEKTRONIK, 608 002 134 21
4
2
J1, J2
CONN., BNC, 5 PINS
CONNEX, 112404
5
4
MH1–MH4
STAND-OFF, NYLON, 0.25"
KEYSTONE, 8831(SNAP ON)
4
dc2246af
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.
A
B
C
D
E2
E1
5
PG
EN/UV
E4
J1
CIN
10µF
50V
E3
+
50CE10BSS
INPUT RIPPLE
MONITOR
GND
VIN
3.8V-20V
C5
OPT
0603
C1
4.7uF
50V
1206
R7
OPT
0402
4
R6
OPT
0402
4
5
3
1
2
4
3
2
1
PG
EN/UV
IN
IN
U1
LT3042EDD
R5
510
0805
7
6
9
10
C3
4.7uF
25V
1206
R4
49.9K
0805
R3
453K
0805
GND
OUTPUT NOISE
MONITOR
E6
VOUT
3.3V, 200mA
*
1
1
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
C6 J2
OPT
0603
C2
4.7uF
25V
1206
C4 E5
OPT
1206
* SEE DEMO MANUAL
1
dc2246af
5
3
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
DATE:
2
Thursday, January 15, 2015
1
SHEET
OF
20V, 200mA, ULTRALOW NOISE,
ULTRAHIGH
PSRR RF LDO REGULATOR
Figure 2. DC2246A Demo Circuit Schematic
IC NO.
REV.
SIZE
LT3042EDD
N/A
2
DC2246A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
TECHNOLOGY
R2
33.2K
1206
2
TITLE: SCHEMATIC
SET
PGFB
OUTS
OUT
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.
CUSTOMER NOTICE
ON
4 USER SELECT
6 OFF
R1
200K
JP1
0805
EN/UV
3
ILIM
5
GND
11
GND
8
5
A
B
C
D
DEMO MANUAL DC2246A
Schematic Diagram
DEMO MANUAL DC2246A
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
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ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
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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
6
dc2246af
Linear Technology Corporation
LT 0215 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
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