DEMO MANUAL DC1793A LTC3260EMSE High Voltage, Low Noise, Dual Supply Inverting Charge Pump DESCRIPTION Demonstration circuit 1793A is a high voltage inverting charge pump with low noise dual-polarity LDO regulators featuring the LTC®3260EMSE. The LTC3260 operates with an input voltage from 4.5V to 32V. The demo board provides selectable LDO± output set magnitudes of 3.3V, 5V, 12V and 24V for each polarity. Additional LDO± set point jumper selections and optional topside ADJ± resistors allow the user to set other desired LDO± output voltages. The demo board also provides the means to select between Burst Mode® operation or constant-frequency mode operation, plus select an operating frequency of 500kHz, 200kHz, and 50kHz. The LTC3260 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1793A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS VIN Input Voltage 4.5 32 V VLDO+ LDO+ Output Voltage VIN ≥ LDO+ Set Point + 0.8V 1.2 32 V VLDO– LDO– Output Voltage VOUT ≤ LDO– Set Point – 0.5V –32 –1.2 V VOUT Output Voltage MODE = 0V MODE ≥ 2V MIN TYP MAX –VIN –0.94 • VIN UNITS V V QUICK START PROCEDURE Refer to Figure 1 for the proper measurement equipment setup and jumper settings, and follow the procedure below. NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals. See Figure 2 for proper scope probe technique. 1. Make sure the jumper settings are as follows: JP1: EN+ is in the ON position. JP2: EN– is in the ON position. JP3: MODE is in the BURST position. JP4: FREQ is in the 500kHz position. JP5: LDO+ is set to the 5V setting. JP6: LDO– is set to the –5V setting. 2. Set PS1 to 12V. dc1793afa 1 DEMO MANUAL DC1793A QUICK START PROCEDURE 3. Slowly increase the load on LDO– to –50mA and observe how the output ripple on VOUT changes and how the burst frequency increases. When the load is large enough, the charge pump will run constant frequency to keep VOUT in regulation. 4. Slowly increase the load on LDO+ to 50mA and observe the output ripple and the output voltage on LDO+. 5. Set the LDO+ load and the LDO– load to 0mA and turn off PS1. NOTE: To avoid applying an overvoltage to the ADJ± pins, power must be turned off before changing the LDO+ or LDO– jumpers. 12. Turn on and set PS1 to 32V. 13. Repeat steps 3 through 6. 14. Turn on and set PS1 to 12V. 15. Slowly increase the load on VOUT to –100mA and observe the output ripple and output voltage on VOUT. 16. Set the load on VOUT to 0mA. 17. Change the JP3 MODE jumper from Burst Mode operation to constant-frequency mode and repeat steps 14 and 15. 6. Set the JP5 LDO+ jumper to the 3.3V position and JP6 LDO– to the –3.3V position. 18. Change the JP4 FREQ jumper from 500kHz to 200kHz, then slowly increase the load on VOUT from 0mA to –50mA and observe the output ripple and output voltage on VOUT. 7. Repeat steps 2 through 5. 19. Set the load on VOUT to 0mA. 8. Set the JP5 LDO+ jumper to the 12V position and JP6 LDO– to the –12V position. 20. Change the JP4 FREQ jumper from 200kHz to 50kHz. Slowly increase the load on VOUT from 0mA to –10mA and observe the output ripple and output voltage on VOUT. 9. Turn on and set PS1 to 15V. 10. Repeat steps 3 through 5. 11. Set the JP5 LDO+ jumper to the 24V position and JP6 LDO– to the –24V position. 0-50mA Figures 4 and 5 illustrate how the efficiency varies with load current in Burst Mode operation and in constantfrequency mode operation. 0-50mA Figure 1. Proper Measurement Equipment Setup for DC1793A dc1793afa 2 DEMO MANUAL DC1793A QUICK START PROCEDURE VLDO+ 10mV/DIV AC-COUPLED VLDO– 10mV/DIV AC-COUPLED GND VIN dc1793a F02 VOUT 10mV/DIV AC-COUPLED Figure 2. Measuring Input or Output Ripple dc1793a F03 1μs/DIV fOSC = 500kHz VIN = 15V VLDO+ = 12V ILDO+ = 50mA – = –12V VLDO ILDO– –50mA Figure 3. LDO Rejection of VOUT Ripple 80 VIN = 12V, CONSTANT FREQUENCY +LDO DISABLED –LDO = –5V, 0A 75 70 50kHz CF MODE 65 60 EFFICIENCY (%) 55 200kHz CF MODE 50 45 500kHz CF MODE 40 35 30 25 20 15 10 1 10 –IVOUT (mA) 100 dc1793a F04 Figure 4. VIN to VOUT Constant-Frequency Mode Operation Efficiency dc1793afa 3 DEMO MANUAL DC1793A QUICK START PROCEDURE 80 VIN = 12V, Burst Mode OPERATION +LDO DISABLED –LDO = –5V, 0A fOSC = 500kHz EFFICIENCY (%) 75 70 65 1 10 100 – IVOUT (mA) dc1793a F05 Figure 5. VIN to VOUT Burst Mode Operation Efficiency PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C2, C3, C6, C10 CAP, CER, 10μF, 50V, X7S, 10%, 1210 TDK, C3225X7S1H106K 2 1 C4 CAP, CER, 1μF, 50V, X7R, 10%, 1206 MURATA, GRM31MR71H105KA88 3 2 R11, R18 RES, 100k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402100KFKED 4 1 U1 LOW NOISE DUAL-SUPPLY INVERTING CHARGE PUMP LINEAR TECHNOLOGY, LTC3260EMSE#PBF Additional Demo Board Circuit Components 5 1 C1 CAP, CER, 4.7μF, 50V, X7R, 10%, 1210 MURATA, GRM32ER71H475KA88L 6 0 C5, C7, C9 (OPT) CAP, CER, 0603, 50V OPT 7 2 C8, C11 CAP, CER, 0.01μF, 25V, X7R, 10%, 0402 MURATA, GRM155R71E103KA01D 8 3 R1, R8, R10 RES, 1MΩ, 1/16W, 5%, 0402, SMD VISHAY, CRCW04021M00JNED 9 2 R2, R13 RES, 1.91MΩ, 1/16W, 1%, 0402, SMD VISHAY, CRCW04021M91FKED 10 2 R3, R14 RES, 909k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402909KFKED 11 2 R5, R16 RES, 174k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402174KFKED 12 0 R6, R17 (OPT) RES, 0402, SMD OPT 13 3 R7, R9, R12 RES, 1k, 1/16W, 5%, 0402, SMD VISHAY, CRCW04021K00FKED 14 1 R19 RES, 1MΩ, 1/16W, 1%, 0402, SMD VISHAY, CRCW04021M00FKED 15 1 R20 RES, 200k, 1/16W, 1%, 0402, SMD VISHAY, CRCW0402200KFKED Hardware: For Demo Board Only 17 3 JP1-JP3 HEADER, 3 PIN, 1 ROW, 0.079" SAMTEC, TMM-103-02-L-S 18 1 JP4 HEADER, 4 PIN, 1 ROW, 0.079" SAMTEC, TMM-104-02-L-S 19 2 JP5, JP6 HEADER, 2×5 PINS, 2mm SAMTEC, TMM-105-02-L-D 20 6 JP1-JP6 SHUNT, 2mm SAMTEC, 2SN-KB-G 21 8 E1, E2, E7-E12 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0 22 4 E3-E6 TURRET, 0.061", DIA MILL-MAX, 2308-2-00-80-00-00-07-0 dc1793afa 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. E6 E5 E4 E3 E2 JP1 EN+ 1K R12 1K R9 1K R7 OFF ON C1 4.7uF 50V 1210 1 2 3 R1 1.0M 5% ON OFF JP2 EN - C5 OPT 50V 0603 1 2 3 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE 0402, 1%, 1/16W ALL CAPACITORS ARE 0402, 10% NOTE: UNLESS OTHERWISE SPECIFIED GND MODE EN - EN+ GND 4.5V - 32V VIN VIN CONT FREQ JP3 MODE C7 OPT 50V 0603 BURST R8 1.0M 5% VIN 1 2 3 C9 OPT 50V 0603 1 2 3 4 C4 1uF 50V 1206 R20 200K R19 1.0M 2 9 8 14 13 1 7 10 11 RT NC NC MODE EN- EN+ C- C+ VIN 17 GND 3 4 5 16 15 12 6 C11 0.01uF 25V C8 0.01uF 25V JP5 LDO+ R2 1.91M C3 10uF 50V 1210 R11 100K THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 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. R6 OPT R13 1.91M R5 174K R18 100K SCALE = NONE NC MARTY M. PCB DES. APP ENG. APPROVALS JP6 LDO- R4 316K VOUT R3 909K CUSTOMER NOTICE BYP- ADJ- LDO - BYP+ ADJ+ LDO + VOUT Figure 6. LTC3260EMSE Low Noise Dual Supply Inverting Charge Pump JP4 FREQ 50KHz 200KHz 500KHz R10 1.0M 5% VIN C2 10uF 50V 1210 VIN U1 LTC3260EMSE 24V 12V 5V 3.3V OPT E1 -24V -12V -5V -3.3V OPT R15 316K R17 OPT DATE E12 E11 E10 E9 E8 E7 GND LDO 50mA GND LDO + 50mA GND VOUT ( - VIN ) 100mA 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C10 10uF 50V 1210 APPROVED M. MERCHANT 03 - 12 - 12 DATE: N/A SIZE LTC3260EMSE DEMO CIRCUIT 1793A 03 - 12 - 12 IC NO. SHEET 1 OF 1 2 REV. LOW NOISE DUAL SUPPLY INVERTING CHARGE PUMP TECHNOLOGY R16 174K C6 10uF 50V 1210 DESCRIPTION PRODUCTION FAB 2 REVISION HISTORY REV TITLE: SCHEMATIC R14 909K ECO DEMO MANUAL DC1793A SCHEMATIC DIAGRAM dc1793afa 5 DEMO MANUAL DC1793A 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 dc1793afa 6 Linear Technology Corporation LT 0114 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2012