DEMO MANUAL DC2346A LT8601 42V Triple Monolithic Synchronous Step-Down Regulator Description Demonstration circuit 2346A is a triple power supply featuring the LT(R)8601. LT8601 is a 42V triple monolithic synchronous step-down regulator. The demo circuit is designed for 5V, 3.3V, and 1.8V outputs from a nominal 12V input, with switching frequency set at 2MHz to avoid audio band. The 1.8V converter is powered from the 3.3V output, and the 5V, 3.3V are powered from a wide range of 6V to 24V, transient to 42V. The current capability is 2.5A for the 3.3V output, 1.5A for the 5V output, and 1.8A for the 1.8V output when running individually. Up to 1A load current can be applied to all the channels simultaneously without special cooling. efficiency and external component 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 4 shows the typical thermal performance of the circuit. Individual soft-start, current limit, input voltage, power good for each output simplify the complex design of quadoutput 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 2 channels, reducing the input peak current and voltage ripple. Programmable frequency allows optimization between The LT8601 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 2346A. Performance Summary The demo board has an EMI filter installed on the bottom layer. The radiated EMI performance of the board is shown on Figure 3. The limit in Figure 3 is CISPR Class 5, Peak. It shows the circuit passes the CISPR Class 5, Peak test with a wide margin. Design files for this circuit board are available at http://www.linear.com/demo/DC2346A L, LT, LTC, LTM, Linear Technology, Burst Mode 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 Range, VIN Maximum Transient VIN Transient Standby Current When Switching IOUT1,2,3 = 0mA, VIN = 12V MIN TYP MAX 6 12 24 42 60 UNITS V V A Output Voltage VOUT1 VIN = 12V, IOUT1 = 1A 4.80 5 5.20 V Output Voltage VOUT2 VIN = 12V, IOUT2 = 1A 3.17 3.3 3.43 V Output Voltage VOUT3 IOUT3 = 1A 1.73 1.8 1.87 Maximum Output Current IOUT1 VIN = 12V, IOUT2,3 = 0A 1.5 A Maximum Output Current IOUT2 VIN = 12V, IOUT1,3 = 0A 2.5 A Maximum Output Current IOUT3 IOUT1,2 = 0A 1.8 A Switching Frequency VIN = 12V, IOUT1,2,3 = 1A 1.85 Efficiency, Channel 1 VIN = 12V, IOUT1 = 1A 91 % Efficiency, Channel 2 VIN = 12V, IOUT2 = 1A 89 % Efficiency, Channel 3 VIN = 12V, IOUT3 = 1A 90 % 2 2.15 V MHz dc2346af 1 DEMO MANUAL DC2346A Quick Start Procedure Demo circuit 2346A is easy to set up to evaluate the performance of the LT8601. 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 on the board. The default positions of the headers are given in Table 2. Table 2. Default Positions of the Headers NAME POSITION EN/UVLO JP1 ON TRKSS1 JP4 ON TRKSS2 JP5 ON RUN3 JP2 RUN SYNC JP7 BURST 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(R) operation in light load and high VIN condition. 3. Check for the proper output voltages. The output should be regulated at 5V (4%), 3.3V (4%), 1.8V (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 LT8601 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. The circuit can be set in pulse-skipping Mode, and it runs in full frequency with lower load current. Refer to the data sheet for details on the input voltage and load current ranges that 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: 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, and RUN3 are set in right positions. dc2346af 2 DEMO MANUAL DC2346A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup VIN OR VOUT GND Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple dc2346af 3 DEMO MANUAL DC2346A Quick Start Procedure Amplitude (dBuV/m) Detector: Peak Polarity: Horizontal 60 55 50 45 40 35 30 25 20 15 10 5 0 -5 -10 -15 Data Class 5 Peak 0 100 200 300 400 500 600 700 800 900 1000 Frequency (MHz) Amplitude (dBuV/m) Detector: Peak Polarity: Vertical 60 55 50 45 40 35 30 25 20 15 10 5 0 -5 -10 -15 Data Class 5 Peak 0 100 200 300 400 500 600 700 800 900 1000 Frequency (MHz) Figure 3. Radiated EMI Performance (Vertical/Horizontal), VIN = 14V, IOUT1,2,3 = 1A (CISPR25 Radiated Emission Test with Class 5 Peak Limits) dc2346af 4 DEMO MANUAL DC2346A Quick Start Procedure A. VIN = 24V B. VIN = 14V Figure 4. Thermal Image Top View, IOUT1,2,3 = 1A, TA = 25C, FSW = 2MHz dc2346af 5 DEMO MANUAL DC2346A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Cap, 4.7F X7R 50V 10% 1206 TDK C3216X7R1H475K Required Circuit Components 1 1 CPVIN1 2 1 CPVIN2 Cap, 10F X7R 50V 10% 1210 Murata GRM32ER71H106KA12L 3 1 CPVIN3 Cap, 4.7F X7R 10V 10% 0805 Murata GRM21BR71A475KA73L 4 1 CVIN Cap, 1F X7R 50V 10% 0805 TDK C2012X7R1H105K 5 1 C1 Cap, 4.7F X5R 10V 10% 0603 TDK C1608X5R1A475K 6 2 C2, C11 Cap, 0.1F X5R 10V 10% 0402 AVX 0402ZD104KAT2A 7 1 C3 Cap, 4.7pF NPO 25V 10% 0603 AVX 06033A4R7KAT2A 8 4 C4, C15, C18, C35 Cap, 47F X5R 10V 20% 1206 Murata GRM31CR61A476ME15L 9 3 C5, C16, C19 Cap, 0.1F X7R 50V 10% 0603 Murata GRM188R71H104KA93D 10 1 C6 Cap, Alum 22F 50V 10% Sun Elect. 50CE22BSS 11 1 C14 Cap, 12pF NPO 25V 10% 0603 AVX 06033A120KAT2A 12 1 C17 Cap, 22pF NPO 25V 5% 0603 AVX 06033A220JAT2A 13 1 C27 Cap, 220pF X7R 25V 10% 0603 AVX 06033C221MAT2A 14 2 C29, C30 Cap, 10F X5R 50V 10% 1206 TDK CGA5L3X5R1H106K160AB 15 2 C32, C33 Cap, 47nF X7R 25V 20% 0603 AVX 06033C473MAT2A 16 3 C36, C37, C39 Cap, 0.1F X7R 50V 10% 0402 TDK CGA2B3X7R1H104K050BB 17 1 FB1 Ferrite Bead, 330 TDK Corp. MPZ2012S331AT000 18 1 L1 Inductor, 3.3H XAL5030 Coilcraft XAL5030-332MEC 19 1 L2 Inductor, 1.5H XAL5030 Coilcraft XFL5015-152MEC 20 1 L3 Inductor, 1H 30% NPIS42LS NIC Comp. Corp. NPIS42LS1R0YTRF 21 1 L5 Inductor, 0.22H Vishay IHLP-1212BZ-ER-R22M11 22 1 R1 Res, Chip 806k 0.06W 1% 0603 Vishay CRCW0603806KFKEA 23 2 R2, R5 Res, Chip 200k 0.06W 1% 0603 Vishay CRCW0603200KFKEA 24 1 R3 Res, Chip 464k 0.06W 1% 0603 Vishay CRCW0603464KFKEA 25 1 R4 Res, Chip 340k 0.06W 1% 0603 Vishay CRCW0603340KFKEA 26 3 R6, R7, R8 Res, Chip 19.1k 0.06W 1% 0603 Vishay CRCW060319K1FKEA 27 4 R10, R15, R19, R21 Res, Chip 100k 0.06W 1% 0603 Vishay CRCW0603100KFKEA 28 1 R11 Res, Chip 187k 0.06W 1% 0603 Vishay CRCW0603187KFKEA 29 1 R12 Res, Chip 150k 0.06W 1% 0603 Vishay CRCW0603150KFKEA 30 1 R18 Res, Chip 28.7k 0.06W 1% 0603 Vishay CRCW060328K7FKEA 31 1 U1 IC, Buck Regulator QFN(40) (UJ) 6MM x 6MM Linear Technology Corporation LT8601EUJ#PBF Additional Demo Board Circuit Components 1 0 R31 (Opt) Res, 0603 Hardware: For Demo Board Only 1 0 TP1,TP2 (Opt) Testpoint 2 5 XJP1, XJP2, XJP4, XJP5, XJP7 Shunt, 2mm Ctrs 3 17 E1, E2, E3, E4, E5, E6, E7, TEST POINT, TURRET, 0.094" MTH HOLE E8, E9, E11, E12, E15, E16, E17, E18, E20, E21 Samtec 2SN-BK-G Mill Max 2501-2-00-80-00-00-07-0 4 5 JP1, JP2, JP4, JP5, JP7 Headers, 3 Pins 2mm Ctrs Samtec TMM-103-02-L-S 5 1 JP6 Jumper, 2 Pins 2mm Ctrs Samtec TMM-102-02-L-S dc2346af 6 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 D ZhE dZ<^^ dZ<^^ Z^d W' W' W' K&& KE dW dW sD/ 5 sKhd ZhE yd K&& KE K&& KE :W ZhE :W dZ<^^ :W Ws/E & s yZ Ws/E & s sKhd W' Z & yZ & yZ Z K 3 ZhE dZ<^^ dZ<^^ /^ Z^d W' W' W' Ehs>K Ws/E Ws/E Ws/E s/E /Eds 3 WKZE WKZ ^zE & ^t & > > Z sKhd Z sKhd Z sKhd Z Z & & Z & * APPROVALS 1. All Resistors 0603. 2. All Capacitors 0603. See Demo Manual for details on VOUT current capability. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 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. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. Zs 2 :W yd hZ^d Z Z WKZE ^zE * sKhd s /& s 'E * sKhd s /& s 'E /7&&21),'(17,$/)25&86720(586(21/< IC NO. 1 /7(8'(02&,5&8,7$ MODIFY DATE: -XQ 1$ SIZE SHEET 1 OF 1 2 REV. 97ULSOH0RQROLWKLF6\QFKURQRXV6WHS'RZQ5HJXODWRU TITLE: SCHEMATIC TECHNOLOGY :W * sKhd s /& s 'E 1 0F&DUWK\%OYG 0LOSLWDV&$ www.linear.com 3KRQH )D[ & s yZ sKhd /Eds ^zE Wh>^^</W & s yZ & s yZ Ws/E & s yZ NOTE: UNLESS OTHERWISE SPECIFIED. & , EW/^>^ZzdZ& E/ZZ > , y&>D Z & s , y>D Z & s CUSTOMER NOTICE ^t ^t ^d & ^t ^d h >dh:W& Zd E E & s W' s/E & s yZ 4 Ws/E & s yZ s/E /Eds & s yZ Ws/E & s yZ & s yZ > , /,>WZZD s/^,z W' & s yZ & K DW^d W' sKhd Z dZ<^^ Z s/E Z & s Z + sKhd Z :W & s Ehs>K 'E s/E sD/ sD/ ss 'E 'E 'E 'E 4 'E 'E 'E 'E 'E 'E 'E 'E 5 A B C D DEMO MANUAL DC2346A Schematic Diagram dc2346af 7 DEMO MANUAL DC2346A 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 dc2346af 8 Linear Technology Corporation LT 0116 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2016