DEMO MANUAL DC1855A LT3030 Dual 750mA/250mA Low Dropout, Low Noise, Micropower Linear Regulator Description Demonstration circuit 1855A is a dual, micropower, low noise and low dropout voltage linear regulator featuring the LT3030. The input voltages are independent for each channel of DC1855A and can range from 2.2V to 20V. Each channel has a jumper that sets the output voltage to either 1.5V, 1.8V, 2.5V, 3.3V, 5V or a voltage that is user programmed by the installation of a resistor. For channel 1 and channel 2, the maximum output currents are 750mA and 250mA and the ceramic output capacitors are 22µF and 10µF respectively. The internal reference of each channel is bypassed with a 10nF capacitor for reduced output noise. Each channel has a jumper for shutdown and a terminal for PWRGD that is pulled up to the input supply. A resistor divider can be easily added that allows precise lockout at low input voltages. Performance Summary PARAMETER CONDITIONS Minimum Input Voltage, VIN VOUT = 1.8V The LT3030 is well suited to applications that require sequencing between dual regulator channels, particularly microprocessor systems and instrumentation that require low noise. Systems with batteries will benefit from the low dropout of the LT3030 and its micropower operation. DC1855A features the LT3030 in a 28-lead 4mm × 5mm QFN package. The LT3030 data sheet must be read in conjunction with this demo manual to properly use or modify demo circuit DC1855A. Design files for this circuit board are available at http://www.linear.com/demo 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 MIN TYP MAX 2.2 20 Maximum Input Voltage, VIN UNITS V V Output Voltage, VOUT VOUT SELECT = 1.5V VOUT SELECT = 1.8V VOUT SELECT = 2.5V VOUT SELECT = 3.3V VOUT SELECT = 5V 1.48 1.77 2.45 3.21 4.86 Maximum Channel 1 Output Current, IOUT1 VIN1 = 3.3V, VOUT1 =1.8V 750 mA Maximum Channel 2 Output Current, IOUT2 VIN2 = 3.3V, VOUT2 =1.8V 250 mA 1.53 1.83 2.56 3.37 5.12 V V V V V dc1855af 1 DEMO MANUAL DC1855A Quick Start Procedure It is easy to set up demonstration circuit DC1855A to evaluate the performance of the LT3030. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: high above the output may increase power dissipation to an unacceptable level. Finally, a protection feature within the LT3030 reduces output current capability at higher input voltages. 1.With the input supplies and loads off and turned down, make all connections according to Figure 1. Set the output voltages for channels 1 and 2 with the VOUT SELECT jumpers. Make sure the VOUTEN jumpers are in the ON positions. 3.Increase the loads to the desire output current. Verify that the output voltages are as programmed by the VOUT SELECT jumpers. 2.Turn on the input supplies and increase them to the desired input voltages. NOTE WHEN SETTING THE INPUT VOLTAGE: An input voltage that is too close to the programmed output voltage (too low) may cause dropout operation and a loss of output voltage regulation. An input voltage that is too 2 NOTE: If an output voltage is low, temporarily disconnect the load to make sure that it is not set too high. 4.Once the proper output voltages are established, adjust the input voltage and load within the operating ranges and observe the output voltage regulation, low quiescent current, shutdown and PWRGD operation and other parameters. dc1855af DEMO MANUAL DC1855A Quick Start Procedure LOAD – + + – – – + + + – – + – + + – dc1855 F01 + – + – LOAD Figure 1: Proper Measurement Equipment Setup for DC1855A dc1855af 3 DEMO MANUAL DC1855A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C1, C2 CAP, X7R, 1µF, 25V, 20%, 0805 TDK C2012X7R1E105M 2 1 C3 CAP, X5R, 22µF, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212ABJ226M 3 1 C4 CAP, X5R, 10µF, 6.3V, 20%, 0805 AVX, 08056D106MAT 4 2 R5, R6 RES., CHIP., 237K, 1%, 1/16W, 0603 VISHAY, CRCW0603237KFKEA 5 1 R8 RES., CHIP., 54.9K, 1%, 1/16W, 0603 VISHAY, CRCW060354K9FKEA 6 1 R9 RES., CHIP., 113K, 1%, 1/16W, 0603 VISHAY, CRCW0603113KFKEA 7 1 U1 IC., LT3030EUFD, QFN28EUFD-4 × 5 LINEAR, LT3030EUFD CAP, X7R, 0.01µF, 25V, 10%, 0603 AVX, 06033C103KAT2A Optional Demo Board Circuit Components 1 0 C5, C6 2 0 C7, C8 CAP, OPT, TANT, 4.7µF, 50V, 10%, 7343 3 0 C9, C10 CAP., OPT, 7343 4 0 R1, R2, R3, R4 RES., 1M, 5%, 1/16W, 0603 VISHAY, CRCW06031M00JNEA 5 0 R7 RES., CHIP., 54.9k, 1%, 1/16W, 0603 VISHAY, CRCW060354K9FKEA 6 0 R10 RES., CHIP., 113k, 1%, 1/16W, 0603 VISHAY, CRCW0603113KFKEA 7 0 R11, R12 RES., CHIP., 249k, 1%, 1/16W, 0603 VISHAY, CRCW0603249KFKEA 8 0 R13, R14 RES., CHIP., 402k, 1%, 1/16W, 0603 VISHAY, CRCW0603402KFKEA 9 0 R15, R16 RES., CHIP., 732k, 1%, 1/16W, 0603 VISHAY, CRCW0603732KFKEA 10 0 R17, R18, R19, R20 RES., OPT, 0603 Hardware: For Demo Board Only 1 10 E1-E10 TESTPOINT, TURRET, .095" MILL-MAX, 2501-2-00-80-00-00-07-0 2 2 JP1, JP2 3 PIN, 0.079 SINGLE ROW HEADER SAMTEC, TMM103-02-L-S 3 2 JP3, JP4 2 × 6, 0.079 DOUBLE ROW HEADER SAMTEC, TMM106-02-L-D 4 4 XJP1-XJP4 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 4 dc1855af 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. GND VOUT1 750mA PWRGD1 E4 E3 E9 + R7 54.9k C3 22uF 6.3V 0805 R9 113k R11 249k 5% R1 1M R13 402k R15 732k R5 237k R17 OPT JP3 VOUT1 SELECT * SEE PERFORMANCE SUMMARY FOR MINIMUM INPUT VOLTAGE CONDITIONS. C9 OPT 7343 R3 1M 5% R19 OPT JP1 VOUT1EN C5 0.01uF 19 24 25 26 3 4 27 22 28 1 2 23 GND GND GND GND GND GND ADJ1 PWRGD1 BYP1 OUT1 OUT1 SHDN1 U1 LT3030EUFD ON 1 2 3 OFF E2 C1 1uF 25V 0805 21 IN1 20 IN1 GND C7 4.7uF 50V OPT 7343 1.5V 1.8V 2.5V 3.3V 5V OPT 1 3 5 7 9 11 2 4 6 8 10 12 + R20 OPT JP2 VOUT2EN GND GND GND GND GND GND ADJ2 PWRGD2 BYP2 OUT2 OUT2 SHDN2 14 18 13 12 11 6 5 10 15 9 7 8 ON 3 2 1 OFF E1 IN2 16 IN2 17 GND 29 R6 237k R4 1M 5% R12 249k R14 402k R16 732k R18 OPT + + C10 OPT 7343 E6 E5 E10 E8 GND VOUT2 250mA PWRGD2 * VIN2 C8 2.2V - 20V 4.7uF 50V OPT 7343 E7 GND 1. ALL RESISTORS ARE IN OHMS 1% 0603. 2. ALL CAPACITORS ARE IN MICROFARADS 0603. R10 113k C4 10uF 6.3V 0805 C2 1uF 25V 0805 NOTE: UNLESS OTHERWISE SPECIFIED R8 54.9k JP4 C6 0.01uF VOUT2 SELECT 5% R2 1M 1.5V 1.8V 2.5V 3.3V 5V OPT 2 4 6 8 10 12 1 3 5 7 9 11 * VIN1 2.2V - 20V DEMO MANUAL DC1855A Schematic Diagram dc1855af 5 DEMO MANUAL DC1855A 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 dc1855af Linear Technology Corporation LT 0213 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013