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. dc2246af 1 DEMO MANUAL DC2246A Board Photo 2 dc2246af 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 dc2246af 3 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 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 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