DEMO MANUAL DC2235A LTC3265EDHC Low Noise Dual Supply with Boost and Inverting Charge Pumps DESCRIPTION Demonstration Circuit 2235A has boost and inverting charge pumps each with a low noise LDO post regulator featuring the LTC®3265EDHC. The LTC3265 operates with an input voltage from 4.5V to 16V for the boost charge pump and from 4.5V to 32V for the inverting charge pump. The demo board provides selectable LDO± output set magnitudes of 5V, 15V, and 24V for each polarity. The demo board also provides the means to select between low power Burst Mode® operation or low noise constant-frequency PERFORMANCE SUMMARY SYMBOL PARAMETER mode operation, plus select an operating frequency of 500kHz, 200kHz, or 50kHz. The LTC3265 data sheet gives a complete description of the device, operation and application information. The data sheet must be read in conjunction with this demo manual. Design files for this circuit board are available at http://www.linear.com/demo/DC2235A 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. Specifications are at TA = 25°C CONDITIONS MIN TYP MAX UNITS VIN_P VIN_P Input Voltage Range 4.5 16 V VIN_N VIN_N Input Voltage Range 4.5 32 V VLDO+ LDO+ Output Voltage 1.2 32 V VLDO – LDO– Output Voltage VIN_N VOUT+ VOUT+ Output Voltage Range MODE = 0V (Const. Freq.) MODE ≥ 2V (Burst) VIN_P • 2 0.94 • VIN_P • 2 V V VOUT– VOUT– Output Voltage Range MODE = 0V (Const. Freq.) MODE ≥ 2V (Burst) –VIN_N –0.94 • VIN_N V V VIN_P • 2 ≥ LDO+ Set Point + 0.8V ≤ LDO– Set Point – 0.5V –32 –1.2 V BOARD PHOTO dc2235af 1 DEMO MANUAL DC2235A TYPICAL APPLICATIONS LDO Rejection of VOUT ± Ripple Low Noise ±15V Outputs from a Single 12V Input 1µF CBST+ CBST – VOUT+ VIN_N 12V 1µF +15V 10µF LTC3265 EN+ EN– ADJ+ BYP+ MODE GND CINV+ BYP– CINV – ADJ– VOUT– LDO– VLDO+ 10mV/DIV AC-COUPLED VLDO– 10mV/DIV AC-COUPLED 10µF LDO+ VIN_P 10µF VOUT+ 10mV/DIV AC-COUPLED 100nF 604K VOUT– 10mV/DIV AC-COUPLED 52.3k 1µs/DIV 100nF VIN_P = 12V, VIN_N = VOUT VLDO+ = 15V VLDO– = –15V fOSC = 500kHz ILDO+ = 20mA ILDO– = –20mA 52.3k 604K 10µF RT DC2235A TA01b + –15V 10µF DC2235A TA01a QUICK START PROCEDURE Refer to Figure 1 for the proper measurement equipment setup and jumper settings and follow the procedure below. 5. Slowly increase the load on LDO+ to 50mA and observe the output ripple and the output voltage on LDO+. 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. 6. Set the LDO+ load and the LDO– load to 0mA and turn off PS1. 1. Make sure the jumper settings are as follows: JP1: EN+ is on the ON position JP2: EN– is on the ON position JP3: MODE is in the Burst position JP4: FREQ is on the 500kHz position JP5: LDO+ is set to 15V setting JP6: LDO– is set to –15V setting 2. Set SW1 to the VOUT+ position. 3. Set PS1 to 12V. 4. Slowly increase load on LDO– to –50mA and observe how output ripple on VOUT– changes and how burst frequency increases. When the load is large enough, the charge pump will run constant-frequency. 2 7. Set SW1 to the VIN_P position. 8. Set JP5 LDO+ jumper to 5V position and JP6 LDO– to the –5V position. Note: It is recommended to remove power or disable the respective regulators prior to changing the positions of the LDO± output jumpers (JP5, JP6). 9. Repeat steps 3 through 6. 10.Set JP5 LDO+ jumper to 24V position and JP6 LDO– to the –24V position. 11.Set SW1 to the VOUT+ position 12.Turn on and set PS1 to 15V. 13.Repeat steps 4 through 6. 14.Return JP5 LDO+ jumper to 15V position and JP5 LDO– to the –15V position. 15.Turn on and set PS1 to 12V. dc2235af DEMO MANUAL DC2235A QUICK START PROCEDURE 16.Slowly increase the load on VOUT+ to 100mA and observe the output ripple and output voltage on VOUT+. 17.Set the load on VOUT + to 0mA. 18.Slowly increase the load on VOUT– to –100mA and observe the output ripple and output voltage on VOUT–. 19.Set the load on VOUT – to 0mA. 20.Change JP3 MODE jumper from Burst Mode operation to the constant-frequency mode and repeat steps 16 to 19. 21.Change 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+. 22.Set the load on VOUT+ to 0mA. 23.Slowly increase the load on VOUT– to –50mA and observe the output ripple and output voltage on VOUT–. 24.Set the load on VOUT– to 0mA. 25.Change 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+. 26.Set the load on VOUT+ to 0mA. 27.Slowly increase the load on VOUT– to -10mA and observe the output ripple and output voltage on VOUT–. 28.Set the load on VOUT– to 0mA. 29.Turn off the loads and supply when done. Figure 1. Proper Measurement Equipment Setup for DC2235A dc2235af 3 DEMO MANUAL DC2235A QUICK START PROCEDURE Figure 2. Measuring Input or Output Ripple APPLICATIONS INFORMATION Figure 3 illustrates the voltage loss from the ideal boost charge pump output voltage of 2 • VIN_P to the measured VOUT+ voltage. Figure 4 illustrates the voltage loss from 3.0 RT = 200kΩ VIN_P = 10V 2.5 2.0 RT = 1.2MΩ 1.5 1.0 0.5 RT = GND 0 0.1 1 10 LOAD CURRENT (mA) 100 DC2235A F03 Figure 3. VOUT+ Voltage Loss vs Output Current (Constant-Frequency Mode) 4 VIN_P = VIN_N = 10V RT = 200kΩ 2.5 (VIN_N–|VOUT–|) VOLTAGE (V) (2 • VIN_P– VOUT+) VOLTAGE (V) 3.0 the ideal inverting charge pump output voltage of –VIN_N to the measured VOUT– voltage. 2.0 1.5 RT = GND 1.0 0.5 0 0.1 RT = 1.2MΩ 1 10 LOAD CURRENT (mA) 100 DC2235A F04 Figure 4. VOUT– Voltage Loss vs Output Current (Constant-Frequency Mode) dc2235af DEMO MANUAL DC2235A APPLICATIONS INFORMATION Figures 5 and 6 are CISPR radiated and conducted emissions respectively. The data were collected in a GTEM chamber and using a CISPR25 LISN for conducted emissions. The EMI tests were conducted using a 12V input on VIN_P, VOUT+ connected to VIN_N via SW1 of the demo board, and a 600Ω resistor load between LDO+ and LDO– in constant-frequency mode with a 500kHz oscillator frequency. Linear Technology has made every effort to provide useful and accurate EMI data, but it remains the responsibility of the customer to ensure product compliance with applicable rules and regulations. 110 50 100 40 AMPLITUDE (dBμV) 90 dBμV/m 30 20 10 80 70 60 50 40 30 20 0 10 –10 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) dc2235 F05 VIN = 12V, VOUT = ±15V, 600Ω LOAD RESISTOR WITHOUT C1 INSTALLED VIN = 12V, VOUT = ±15V, 600Ω LOAD RESISTOR WITH C1 = 10μF CISPR22 LIMIT LINE Figure 5. CISPR22 Radiated Emissions 0 100k 1M 10M FREQUENCY (Hz) 100M dc2235a F06 VIN = 12V, VOUT = ±15V, LOAD = 600Ω WITHOUT C1 INSTALLED VIN = 12V, VOUT = ±15V, LOAD = 600Ω WITH C1 = 10μF CISPR25 LIMITS FOR BROADBAND CONDUCTED DISTURBANCES ON POWER INPUT TERMINALS PEAK LIMIT (CLASS 3) Figure 6. CISPR25 Conducted Emissions dc2235af 5 DEMO MANUAL DC2235A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP, CHIP, X7R,10µF, ±10%, 25V, 1206 WURTH ELEKTRONIK, 885012208069 2 5 C3, C6, C10, C12, C14 CAP, CHIP, X7S, 10µF, ±10%, 50V, 1210 TDK, C3225X7S1H106K250AB 3 1 C4 CAP, CHIP, X7R, 1µF, ±10%, 25V, 0805 TDK, C2012X7R1E105K125AB 4 1 C13 CAP, CHIP, X7R, 1µF, ±10%, 50V, 1206 TDK, C3216X7R1H105K160AB 5 2 R3, R9 RES 604kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402604KFKED 6 2 R11, R12 RES 52.3kΩ 1/16W 1% 0402 SMD VISHAY, CRCW040252K3FKED 7 1 U1 LOW NOISE DUAL SUPPLY WITH BOOST AND INVERTING CHARGE PUMPS LINEAR TECH., LTC3265EDHC#PBF C1 CAP, CHIP, X7R,10µF, ±10%, 25V, 1206 WURTH, 885012208069 Additional Demo Board Circuit Components 8 1 9 0 C5, C7, C9 (OPT) CAP, CHIP, 25V, 0603 10 2 C8, C11 CAP, CHIP, X7R, .1µF, ±10%, 16V, 0402 MURATA, GRM155R71C104KA88D 11 2 C15, C16 CAP, CHIP, NPO, 10pF, ±5%, 50V, 0402 AVX, 04025A100JAT2A 12 3 R1, R6, R13 RES 1.0MΩ 1/16W 5% 0402 SMD VISHAY, CRCW04021M00JNED 13 2 R2, R8 RES 1.0MΩ 1/16W 1% 0402 SMD VISHAY, CRCW04021M00FKED 14 2 R4, R10 RES 165kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402165KFKED 15 3 R5, R7, R14 RES 4.7kΩ 1/16W 5% 0402 SMD VISHAY, CRCW04024K70JNED 16 1 R15 RES 909kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402909KFKED 17 1 R16 RES 200kΩ 1/16W 1% 0402 SMD VISHAY, CRCW0402200KFKED 3 JP1, JP2, JP3 HEADER, 3-PIN 1 ROW 0.079CC SULLIN, NRPN031PAEN-RC Hardware 18 6 19 1 JP4 HEADER, 4-PIN 1 ROW 0.079CC SULLIN, NRPN041PAEN-RC 20 2 JP5, JP6 HEADER, 2 × 3 PINS, 2mm SULLIN, NRPN032PAEN-RC 21 6 JP1-JP6 SHUNT, 2mm SAMTEC, 2SN-BK-G 22 10 E1, E2, E7-E14 TP, TURRET, 0.094", PBF MILL-MAX, 2501-2-00-80-00-00-07-0 23 4 E3-E6 TURRET, 0.061" DIA MILL-MAX, 2308-2-00-80-00-00-07-0 24 4 MH1-MH4 STAND-OFF, NYLON 0.375" TALL KEYSTONE, 8832 (SNAP ON) 25 1 SW1 10mm × 2.5mm, SLIDE SWITCH, THT WURTH ELEKTRONIK, 450301014042 dc2235af 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 4.7k 5% R14 4.7k 5% R7 4.7k 5% R5 OFF ON EN+ C1 10uF 25V 1206 (1210) 1 2 3 JP2 EN - C5 OPT 25V 0603 OFF ON R1 1.0M 5% VIN_P 1 2 3 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE 0402, 1%, 1/16W ALL CAPACITORS ARE 0402, 10% SW1 CONST FREQ JP3 MODE C7 OPT 25V 0603 BURST R6 1.0M 5% 1 2 3 WURTH 450301014042 VIN_P VOUT+ VIN_P NOTE: UNLESS OTHERWISE SPECIFIED GND MODE EN - EN+ GND 4.5V - 16V VIN_P C9 OPT 25V 0603 2 3 4 C12 10uF 50V 1210 500kHz 200kHz JP4 FREQ 1 50kHz R13 1.0M 5% VIN_P VIN_N C2 10uF 25V 1206 (1210) R16 200k R15 909k 12 14 4 13 9 11 1 2 C13 1uF 50V 1206 10 C4 1uF 25V 0805 3 RT MODE EN- EN+ CINV+ CINV- VIN_N CBST- CBST+ VIN_P U1 LTC3265 19 GND C14 10uF 50V 1210 C11 0.1uF 16V R9 604k JP6 ** LDO- R8 1.0M R3 604k JP5 ** LDO+ R2 1.0M C8 0.1uF 16V C3 10uF 50V 1210 R10 165k R4 165k THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE 8 7 5 6 16 15 17 18 APPROVALS C16 10pF 50V R12 52.3k R11 52.3k C15 10pF 50V SCALE = NONE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. NC VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. MARTY M. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VOUT- LDO - BYP- ADJ- ADJ+ BYP+ LDO + VOUT+ 24V 15V 5V -24V -15V -5V E1 DATE: N/A SIZE APPROVED DATE VOUT+ GND LDO 50mA GND LDO + 50mA GND ( 2 · VIN_P ) * E14 GND VOUT( - VIN_N ) * E13 E12 E11 E10 E9 E8 E7 M. MERCHANT 05 - 28 - 15 LTC3265EDHC DEMO CIRCUIT 2235A 05 - 28 - 15 IC NO. SHEET 1 OF LOW NOISE DUAL SUPPLY WITH BOOST AND INVERTING CHARGE PUMPS TECHNOLOGY 1 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only WHILE CONVERTER IS ENABLED, THE LDO OUPUT WILL INCREASE TO THE RESPECTIVE VOUT INPUT. ** WARNING: IF LDO± OUTPUT JUMPER (JP5, JP6) IS REMOVED * SEE DEMO MANUAL FOR VOUT ± CURRENT CAPABILITY DESCRIPTION PRODUCTION FAB 3 REVISION HISTORY REV TITLE: SCHEMATIC C10 10uF 50V 1210 C6 10uF 50V 1210 ECO DEMO MANUAL DC2235A SCHEMATIC DIAGRAM dc2235af 7 DEMO MANUAL DC2235A 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 8 dc2235af Linear Technology Corporation LT 0915 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015