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