DEMO MANUAL DC1949A LT8602 42V Quad Monolithic Synchronous Step-Down Regulator Description Demonstration circuit 1949A is a quad power supply featuring the LT(R)8602. LT8602 is a 42V quad monolithic synchronous step-down regulator. The demo circuit is designed for 5.0V, 3.3V, 1.8V, and 1.2V outputs from a nominal 12V input, with switching frequency set at 2MHz to avoid audio band. The 1.8V and 1.2V converters are powered from the 3.3V output. The 5V, 3.3V are powered from a wide range of 5.5V to 42V. The current capability is 2.5A for the 3.3V output, 1.5A for the 5V output, and 1.8A for the other outputs when running individually. Up to 1A load current can be applied to all the channels simultaneously without special cooling. Individual soft-start, current limit, input voltage, power good for each output simplify the complex design of quad-output power converters. All regulators are synchronized to a common external clock input or a resistor programmable 250kHz to 2.2MHz internal oscillator. At all frequencies, a 180 phase shift is maintained between 1 and 3, 2 and 4 channels, reducing the input peak current and voltage ripple. Programmable frequency allows optimization between efficiency and external component Performance Summary size. Each output can be independently disabled using its own TRKSS or RUN pin and be placed in a low quiescent current shutdown mode. Table 1 summarizes the performance of the demo board at room temperature. The circuit can be easily modified for different applications. Figure 6 shows the typical thermal performance of the circuit. The demo board has an EMI filter installed on the bottom layer. The conducted and radiated EMI performance of the board is shown on Figure 4. The limit in Figure 4 is CISPR Class 5, Peak. It shows the circuit passes the CISPR Class 5, Peak test with a wide margin. The LT8602 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 DC1949A. Design files for this circuit board are available at http://www.linear.com/demo/DC1949A 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 = 25C Table 1 PARAMETER CONDITIONS Input Voltage* MIN TYP MAX 5.5 12 42 UNITS V Standby Current When Switching IOUT1,2,3,4 = 0mA, VIN = 12V Output Voltage VOUT1 VIN = 12V, IOUT1 = 1A 4.80 5 5.20 V 60 A Output Voltage VOUT2 IOUT2 = 1A 3.17 3.3 3.43 V Output Voltage VOUT3 IOUT3 = 1A 1.73 1.8 1.87 V Output Voltage VOUT4 IOUT4 = 1A 1.15 1.2 1.25 V Maximum Output Current IOUT1 VIN = 12V, No Load on Other Channels 1.5 A Maximum Output Current IOUT2 VIN = 12V, No Load on Other Channels 2.5 A Maximum Output Current IOUT3 No Load on Other Channels 1.8 A Maximum Output Current IOUT4 No Load on Other Channels 1.8 A Switching Frequency VIN = 12V, IOUT1,2,3,4 = 1.0A 1.85 Efficiency VIN = 12V, IOUT1,2,3,4 = 1.0A 2 80 2.15 MHz % Refer to Figure 6 to determine the maximum input voltage and load. If IC temperature exceeds target, reduce input voltage, output current or switching frequency. dc1949af 1 DEMO MANUAL DC1949A Quick Start Procedure DC1949A is easy to set up to evaluate the performance of the LT8602. Refer to Figure 1 for proper equipment setup and follow the procedure below. 1.With power off, connect the input power supply to the board through VIN and GND terminals on the top layer. Connect the loads to the terminals VOUT1 and GND, VOUT2 and GND, VOUT3 and GND, VOUT4 and GND on the board. The default positions of the Headers are given in Table 2. Table 2. Default Positions of the Headers NAME EN/UVLO POSITION JP1 ON TRKSS1 JP4 ON TRKSS2 JP5 ON RUN3 JP2 RUN RUN4 JP3 RUN 2.Turn on the power at the input. Increase VIN to 12V. Note: Make sure that the input voltage is always within spec. Refer to data sheet on the burst mode operation in light load and high VIN condition. 3.Check for the proper output voltages. The output should be regulated at 5.0V (4%), 3.3V (4%), 1.8V (4%), 1.2V (4%). 4.Once the proper output voltage is established, adjust the input voltage and load currents within the operating range and observe the output voltage regulation, transient, ripple voltage, efficiency and other parameters. Note: Refer to the thermal derating curves in LT8602 data sheet for high input voltage and/or high ambient temperature operations. Note: By default, SYNC is grounded, and the circuit is set in low ripple burst mode operation. Remove R16, and add R25 of 0, the circuit is set in pulse-skipping mode. The circuit runs in full frequency with lower load current. Refer to the data sheet on the input voltage and load current ranges the circuit runs in full frequency. To synchronize to an external clock, apply the external clock to the SYNC turret. Note: When measuring the input or output voltage ripples, 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 capacitor terminals. See Figure 2 for proper scope probe technique. Note: The EMI filter is assembled on the bottom layer of the demo circuit. For EMI test, connect the EMI test facility to the terminals of VEMI+, and VEMI- with very short wires. Note: Do not overload unless proper thermal cooling method such as air flow or heat sink is applied. Note: If there is no output, temporarily disconnect the load to make sure that the load is not set too high, and the Headers of EN/UVLO, TRKSS1, TRKSS2, RUN3, RUN4, are set in right positions. 2 dc1949af DEMO MANUAL DC1949A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup VOUT OR VOUT GND Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple dc1949af 3 DEMO MANUAL DC1949A Quick Start Procedure 0.95 EFFICIENCY (x100%) 0.90 0.85 0.80 0.75 0.70 0.65 0.6 5V, VIN = 12V 3.3V, VIN = 12V 0 0.5 1 1.5 LOAD CURRENT (A) 2 2.5 DC1939A F03 Figure 3. Typical Efficiency Curves of HV Bucks, at VIN = 12V Vertical Polarization 50 45 AMPLITUDE (dBuV/m) 40 CISPR25 CLASS 5 PK LIMIT 35 30 25 20 15 DATA 10 5 0 -5 -10 0 100 200 300 500 600 400 FREQUENCY (MHz) 700 800 900 1000 DC1939A F04a (a) Horizontal Polarization 50 45 AMPLITUDE (dBuV/m) 40 CISPR25 CLASS 5 PK LIMIT 35 30 25 20 15 DATA 10 5 0 -5 -10 0 100 200 300 500 600 400 FREQUENCY (MHz) 700 800 900 1000 DC1939A F04b (b) Figure 4. Radiated EMI (Vertical/Horizontal), VIN = 12V, IOUT1,2,3,4 = 1A 4 dc1949af DEMO MANUAL DC1949A Quick Start Procedure VIN = 12V VIN = 24V Figure 5. Thermal Image Top View, IOUT1,2,3,4 = 1A, TA = 25C, fSW = 2MHz 110 1MHz, 1.5A/5V, 1.5A/3.3V, 1A AT 1.8V, 1.2V 2MHz, 1A AT 5V, 3.3V, 1.8V, 1.2V 1MHz, 1A AT 5V, 3.3V, 1.8V, 1.2V TEMPERATURE RISE (C) 100 90 80 70 60 50 40 30 20 10 6 11 16 21 26 VIN (V) 31 36 41 DC1939A F06 Figure 6. LT8602 Case Temperature Rise, TA = 25C dc1949af 5 DEMO MANUAL DC1949A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CPVIN1 Cap., X7R 4.7F 50V 10% 1206 Murata GRM31CR71H475KA12L 2 1 CPVIN2 Cap., X7R 10F 50V 10% 1210 Murata ERIE GRM32ER71H106KA12L 3 3 C1, CPVIN3, CPVIN4 Cap., X7R 4.7F 10V 10% 0805 Murata GRM21BR71A475KA73L 4 1 CVIN Cap., X7R 1F 50V 10% 0805 TDK C2012X7R1H105KT 5 5 C2, C11, C36, C37, C39 Cap., X7R 0.1F 50V 10% 0402 TDK CGA2B3X7R1H104K050BB 6 1 C3 Cap., NPO 4.7pF 25V 5% 0603 AVX 06033A4R7JAT2A 7 3 C14, C17, C20 Cap., NPO 27pF 25V 5% 0603 AVX 06033A270JAT2A 8 3 C4, C18, C21 Cap., X5R 47F 10V 20% 1206 Murata GRM31CR61A476ME15L 9 4 C5, C16, C19, C22 Cap., X7R 0.1F 50V 10% 0603 Murata GRM188R71H104KA93D 10 1 C6 Cap., Alum 22F 50V 10% Sun Elect. 50CE22BSS 11 1 C15 Cap., X5R 220F 4V 20% 1206 Murata GRM31CR60G227ME11L 12 1 C27 Cap., X7R 220pF 25V 10% 0603 AVX 06033C221MAT2A 13 2 C29, C30 Cap., X5R 10F 50V 10% 1206 Murata CGA5L3X5R1H106K160AB 14 2 C32, C33 Cap., X7R 47nF 25V 20% 0603 AVX 06033C473MAT2A 15 1 FB1 Ferrite Bead, 330 TDK Corp. MPZ2012S331AT000 16 1 L1 Inductor, 4.7H Coilcraft XAL5030-472MEB 17 1 L2 Inductor, 2.2H Coilcraft XAL5030-222MEB 18 2 L3, L4 Inductor, 1.0H 30% NIC Comp. Corp. NPIS42LS1R0YTRF 19 1 L5 Inductor, 0.22H Vishay, IHLP1212BZERR22M11 20 1 R1 Res., Chip 806k 0.06W 1% 0603 Vishay CRCW0603806KFKEA 21 2 R2, R5 Res., Chip 200k 0.06W 1% 0603 Vishay CRCW0603200KFKEA 22 1 R3 Res., Chip 464k 0.06W 1% 0603 Vishay CRCW0603464KFKEA 23 1 R4 Res., Chip 340k 0.06W 1% 0603 Vishay CRCW0603340KFKEA 24 4 R6, R7, R8, R9 Res., Chip 19.1k 0.06W 1% 0603 Vishay CRCW060319K1FKEA 25 4 R10, R19, R21, R22 Res., Chip 100k 0.06W 1% 0603 Vishay CRCW0603100KFKEA 26 1 R11 Res., Chip 187k 0.06W 1% 0603 Vishay CRCW0603187KFKEA 27 2 R12, R14 Res., Chip 150k 0.06W 1% 0603 Vishay CRCW0603150KFKEA 28 1 R13 Res., Chip 75.0k 0.06W 1% 0603 Vishay CRCW060375K0FKEA 29 1 R16 Res., Chip 10.0k 0.06W 1% 0603 Vishay CRCW060310K0FKEA 30 1 R18 Res., Chip 28.7k 0.06W 1% 0603 Vishay CRCW060328K7FKEA 31 2 R23, R24 Res, Chip 0 0.25W 5A 0603 Vishay CRCW06030000Z0EA 32 1 U1 Buck Regulator QFN(40)(UJ) 6mm x 6mm Linear Tech. Corp. LT8602EUJ#PBF Vishay CRCW06030000Z0EA Additional Demo Board Circuit Components 1 0 R25 (Opt) Res, Chip 0 0.25W 5A 0603 2 0 C31, C34 (Opt) Cap., 0603 3 0 C35 (Opt) Cap., 1206 Hardware: For Demo Board Only 5 XJP1, XJP2, XJP3, XJP4, XJP5 Shunt, 2mm Ctrs. Samtec 2SN-BK-G 2 4 MH1-MH4 Stand-Off, Nylon 0.25" Tall Keystone, 8831 (Snap On) 3 21 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15, E16, E17, E18, E19, E20, E21 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0 4 5 JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs. Samtec TMM-103-02-L-S 1 6 dc1949af 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 RUN4 RUN3 TRKSS2 TRKSS1 RST PG4 PG3 PG2 PG1 OFF ON TP2 3 2 1 5 E19 VOUT2 RUN EXT RUN EXT OFF ON OFF ON 3 JP3 RUN4 JP2 RUN3 JP5 3 2 1 3 2 1 3 2 TRKSS2 1 JP4 2 1 C36 0.1F 50V 0402 VOUT2 VOUT2 VOUT2 22 17 34 14 37 PG2 PG2 100k 1% R22 100k 1% R21 47nF X7R C33 47nF X7R C32 PG4 (2MHz) R18 28.7k 1% (Opt) 19 29 18 30 20 21 10 32 12 40 C31 CPVIN4 4.7F 10V X7R 0805 R24 0 Ohm C37 0.1F 50V 0402 PG3 C34 (Opt) CPVIN3 4.7F 10V X7R 0805 R23 0 Ohm CVIN 1F 50V X7R 0805 23 INTVcc 28 1 4 CPVIN1 4.7F 50V X7R 1206 VIN C1 4.7F 10V X7R 0805 11 CPVIN2 10F 50V X7R 1210 VISHAY C30 10F 50V X5R 1206 PG2 R9 19.1k 1% VOUT4 C29 10F 50V X5R 1206 PG1 VOUT3 R8 19.1k 1% TRKSS1 R7 19.1k 1% 1% VIN R10 100k 1% C6 22F 50V R4 340k + VOUT1 R6 19.1k 1% E17 E21 E20 E15 E13 E12 E11 E9 JP1 EN/UVLO GND VIN E4 TP1 VEMI- VEMI N/C RT RUN4 RUN3 TRKSS2 TRKSS1 BIAS RST PG4 PG3 PG2 PG1 EN/UVLO PVIN4 PVIN3 PVIN2 PVIN1 VIN INTVCC 3 5 26 3 4 25 39 31 33 24 15 27 36 L2 R13 75.0k 1% VOUT4 R11 187k 1% VOUT3 R3 464k 1% VOUT2 R1 806k 1% VOUT1 R5 R12 200k 1% R14 150k 1% C20 27pF 150k 1% C17 27pF C14 27pF R2 200k 1% C3 4.7pF C21 47F 10V X5R 1206 C18 47F 10V X5R 1206 C15 220F 4V 1206 C4 47F 10V X5R 1206 C35 1206 (Opt) CUSTOMER NOTICE * ** 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. DATE: N/A SIZE Jun 16, 2015 IC NO. TITLE: SCHEMATIC 1 POREN SYNC * OF 1 1 4 SHEET DC1949A_02_REV4 1 42V Quad Monolithic Step-Down Regulator with Power-On Reset LT8602EUJ DEMO CIRCUIT 1949A REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E18 E16 E10 VOUT4 1.2V / 1A C22 0.IF 50V E14 0603 GND E7 VOUT3 1.8V / 1A C19 0.IF 50V E8 0603 GND * * * E5 VOUT2 3.3V / C16 0.IF 50V E6 0603 GND E1 VOUT1 5V / 1A C5 0.IF 50V E3 0603 GND R19 100k 1% TECHNOLOGY 1. All Resistors 0603. 2. All Capacitors 0603. See Demo Manual for details on VOUT current capability. See Demo Manual for operation details. NOTE: UNLESS OTHERWISE SPECIFIED. C27 220pF INTVcc R25 0 Ohm (Opt) 1.0H NPIS42LS1R0YTRF NIC Comp. Corp. L4 1.0H NPIS42LS1R0YTRF NIC Comp. Corp. L3 2.2H XAL5030-222MEB Coilcraft C11 0.1F 50V 0402 R16 10.0k 1% L1 4.7H XAL5030-472MEB Coilcraft C2 0.1F 50V 0402 2 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. POREN CPOR SYNC FB4 SW4 FB3 SW3 FB2 6 SW2 7 SW2 BST2 FB1 SW1 BST1 U1 LT8602EUJ#PBF GND 2 C39 0.1F 50V 0402 GND 8 ** GND 9 VEMI+ 5.5V - 42V GND 13 D GND 16 FB1 L5 330 Ohm 0.22H MPZ2012S331AT000 IHLP1212BZERR22M11 GND 35 E2 3 GND 38 4 GND 41 5 A B C D DEMO MANUAL DC1949A Schematic Diagram dc1949af 7 DEMO MANUAL DC1949A 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 (c) 2004, Linear Technology Corporation 8 dc1949af Linear Technology Corporation LT 0715 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2015