DEMO MANUAL DC2469A LT8603 42V, Low IQ, Quad Output Triple Monolithic Buck Converter with Boost Channel as SEPIC DESCRIPTION Demonstration circuit 2469A features the LT(R)8603 with triple monolithic buck regulators and the boost channel as SEPIC. The demo circuit is designed for 8V, 5V, 3.3V, and 1.8V outputs from a nominal 12V input. The 4th channel is set as a SEPIC converter and its output is regulated at 8V over a wide input range. The two high voltage buck regulators are powered from VOUT4. VOUT1 is regulated at 5V with 1.5A maximum output load current, and VOUT2 is at 3.3V with 2.5A maximum output load current. The low voltage buck is powered from VOUT2 (3.3V), and the output VOUT3 is regulated at 1.8V with 1.8A maximum load current. Thanks to the SEPIC converter, all four outputs can ride through a cold crank in automotive applications while providing regulated output voltages. Many popular features such as soft-start, cycle-by-cycle current limit, power good for each of the four channels are packed in the 40-lead 6mm x 6mm QFN package to simplify the complex design of quad-output power converters. Each buck regulator can be independently disabled using its own TRKSS or RUN pin. The SEPIC can be disabled by pulling down both the FSEL4A and FSEL4B. The EN/UVLO can be used to shut down the circuit to reduce the input current to 1A. All regulators are synchronized to an internal oscillator that can be programmed with one resistor at RT pin. Programmable frequency allows optimization between efficiency and external component size. To avoid the audio band, the DC2469A sets the switching frequency at 2MHz for the three buck regulators, and the SEPIC converter is at 400kHz. At all frequencies, a 180 phase shift is maintained between 1 and 2 channels, reducing the input peak current and voltage ripple. The LT8603 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 DC2469A. PERFORMANCE SUMMARY Table 1 summarizes the performance of the demo board at room temperature. The demo circuit can be easily modified for various automotive, transportation and industry applications. For applications that need 4th channel configured as a boost converter, the DC2114A should be used. Design files for this circuit board are available at http://www.linear.com/demo/DC2469A All registered trademarks and trademarks are the property of their respective owners. Specifications are at TA = 25C Table 1. PARAMETER CONDITIONS Operation Input Voltage Range MIN TYP MAX 3 12 42 V 4.5 V Minimum Start-Up, VINMIN 40 UNITS Standby Current When Switching IOUT1,2,3,4 = 0mA, VIN = 12V Channel 4 Output Voltage, VOUT4 IOUT4 = 1A 7.68 8 8.32 A V Channel 1 Output Voltage, VOUT1 IOUT1 = 1.5A 4.86 5 5.14 V Channel 2 Output Voltage, VOUT2 IOUT2 = 2.5A 3.17 3.3 3.43 V Channel 3 Output Voltage, VOUT3 IOUT3 = 1.8A 1.73 1.8 1.87 V Maximum Output Current, IOUT1 VIN = 12V 1.5 A Maximum Output Current, IOUT2 VIN = 12V, IOUT3 = 0A 2.5 A dc2469af 1 DEMO MANUAL DC2469A PERFORMANCE SUMMARY Table 1. PARAMETER CONDITIONS MIN TYP MAX UNITS Maximum Output Current, IOUT3 VIN = 12V, IOUT2 = 0A 1.8 A Maximum Output Current, IOUT4 VIN = 12V, IOUT1,2,3 = 0A 1.5 A Switching Frequency, Channel 1~3 VIN = 12V, IOUT1,2,3 = 1A 1.85 2 2.15 MHz Switching Frequency, Channel 4 VIN = 6V, IOUT4 = 1A 370 400 430 kHz Efficiency, Channel 4 VIN = 7V, IOUT4 = 2.5A 84 % Efficiency, CH1, 5V VIN = 12V, IOUT1 = 1.5A 89 % Efficiency, CH2, 3.3V VIN = 12V, IOUT2 = 2.5A 84 % Efficiency, CH3, 1.8V PVIN3 = 3.3V, IOUT3 = 1.8A 83 % Efficiency, Overall VIN = 14V, IOUT1,2,3 = 1A 75 % QUICK START PROCEDURE Demonstration circuit 2469A is easy to set up to evaluate the performance of the LT8603. Refer to Figure 1 for proper equipment setup and follow these procedures. 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 JP4 ON TRKSS1 JP1 ON TRKSS2 JP2 ON RUN3 JP3 RUN 2.Turn on the power at the input. Increase VIN to 4.5V. Make sure that the input voltage is always within spec. Refer to data sheet on the switching in high VIN condition and the Burst Mode(R) operation in light load. The minimum start-up voltage for the SEPIC converter (and the board) is 4.5V. Once it starts, the circuit runs with input going down below 3V at light load. 3.Check for the proper switching frequency and output voltage at channel 4. The output is set at 8V (4%). The SEPIC converter output current capability depends on the input voltage. If the 4th output is not regulated, temporarily disconnect the load, and disable the two high voltage buck regulators (channels 1, 2) as well. Check if the EN/UVLO is set in correct position. Check if too much load is applied to VOUT4. SEPIC does not have overcurrent or short-circuit protection capability. NOTE: By default, the switching frequency of the SEPIC converter is optimized with 400kHz with FSEL4A low and FSEL4B high. The switching frequency can be changed with RT, or different FSEL4A / FSEL4B settings. An accompanying change of inductors might be necessary to achieve desirable performance of the converter. 4.Check for the proper output voltages of the buck regulators. The output should be regulated at 5V (4%), 3.3V (4%), 1.8V (4%) for the channels 1, 2 and 3, respectively. Do not overload the buck regulators simultaneously at high line unless proper thermal cooling method such as air flow or heat sink is applied. If there is no output, temporarily disconnect the load of the corresponding channels to make sure that the dc2469af 2 DEMO MANUAL DC2469A QUICK START PROCEDURE loads are not set too high, and the headers of EN/UVLO, TRKSS1, TRKSS2, RUN3 are set in right positions. 5.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. By default the circuit is set in low ripple Burst Mode operation with SYNC grounded. Remove R11, and add 0 at R10, the circuit is set in pulse-skipping mode. The circuit runs in full frequency with lower load current in this mode. To synchronize to an external clock, apply the external clock to the SYNC turret. 6.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: Refer to the thermal derating curves in LT8603 data sheet for high input voltage and/or high ambient temperature operations. dc2469af 3 DEMO MANUAL DC2469A QUICK START PROCEDURE Figure 1. Proper Measurement Equipment Setup dc2469af 4 DEMO MANUAL DC2469A QUICK START PROCEDURE VIN OR VOUT GND Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple A) VIN = 6V B) VIN = 24V Figure 3. Thermal Image Top View, IOUT1 = 1A, IOUT2 = 1A, IOUT3 = 1A, TA = 25C, FSW = 2MHz dc2469af 5 DEMO MANUAL DC2469A QUICK START PROCEDURE 90 92 80 83 70 75 EFFICIENCY (%) EFFICIENCY (%) CH1, CH2 Efficiency 100 fSW = 2MHz VIN = 8V 67 58 50 Efficiency, V OUT = 8V Burst Mode OPERATION PULSE-SKIPPING MODE 60 50 fSW = 400kHz VIN = 7V 40 0 0.3 0.5 0.8 1 1.3 1.5 1.8 LOAD CURRENT (A) 30 2 2.3 2.5 0 DC2469A F04a 0.3 0.5 0.8 1 1.3 1.5 1.8 LOAD CURRENT (A) 2 2.3 2.5 DC2469A F04b Figure 4. Load Transient from 50mA to 450mA at VOUT4, VIN = 5V, FSW = 400kHz, Burst Mode Operation Output Current 5 RSENSE = 0.008 IOUT (A) 4 3 2 1 0 4 4.4 4.8 5.2 5.6 6 6.4 6.8 7.2 7.6 VIN (V) 8 DC2469A F05 Figure 5. SEPIC Maximum Output Current vs Input Voltage dc2469af 6 DEMO MANUAL DC2469A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Cap, X5R 1F 50V 10% 0603 Murata, GRM188R61H105KAALD Required Circuit Components 1 1 CVIN 2 2 C26, C27 Cap, X7R 4.7F 50V 10% 1206 Murata, GRM31CR71H475KA12L 3 2 CVIN1, CVIN2 Cap, X7R 4.7F 16V 10% 0805 Murata, GRM21BR71C475KA73L 4 1 CVIN3 Cap, X5R 10F 6.3V 20% 0603 Murata, GRM188R60J106ME47D 5 4 CVIN4, CVIN5, CVIN6, CVIN7 Cap, X5R 10F 50V 10% 1206 Murata, GRM31CR61H106KA12L 6 1 C1 Cap, Alum 22F 50V 10% Sun Elect Ind, 50CE22BSS 7 3 C2, C3, C32 Cap, X7R 0.1F 50V 10% 0402 Murata, GRM155R71H104KE14J 8 2 C6, C9 Cap, X5R 47F 16V 10% 1210 Murata, GRM32ER61C476KE15K 9 1 C7 Cap, Alum 47F 16V 20% Sun Elect Ind, 16CE47BS 10 1 C8 Cap, X7R 0.1F 50V 10% 0603 Murata, GRM188R71H104KA93D 11 2 C10, C17 Cap, X7R 0.1F 16V 10% 0402 Murata, GRM155R71C104KA88D 12 2 C11, C15 Cap, X7R 47nF 25V 20% 0603 Murata, GRM188R71C473KA01D 13 2 C12, C22 Cap, X5R 47F 10V 10% 1206 Murata, GRM31CR61A476KE15L 14 3 C13, C19, C23 Cap, X7R 2.2F 10V 10% 0402 Murata, GRM155R61A225KE95D 15 1 C18 Cap, X5R 100F 6.3V 20% 1206 Murata, GRM31CR60J107ME39K 16 2 C20, C21 Cap, X7R 4.7F 10V 10% 0603 Murata, GRM188R61A475KE15D 17 1 C25 Cap, C0G 1500pF 25V 5% 0603 Murata, GRM1885C1E152JA01D 18 1 C29 Cap, C0G 2.2pF 50V 0.25pF 0603 Murata, GRM1885C1H2R2CA01D 19 1 C30 Cap, C0G 4.7pF 50V 0.25pF 0603 Murata, GRM1885C1H4R7CA01D 20 1 C31 Cap, C0G 22pF 50V 5% 0603 Murata, GRM1885C1H220JA01D 21 2 C34, C38 Cap, X7R 10F 50V 10% 1210 Murata, GRM32ER71H106KA12L 22 1 D1 Schottky Rectifier, 60V, 5A, SOT1289 Nexperia, PMEG060V050EPD 23 2 D2, D3 Schottky Rectifier, 0.2A, SOD523 NXP, PMEG6002EB 24 1 FB1 BEAD, 4A 1206 Wurth Elektronik, 742792150 25 1 L1 Res, Jumper, Chip, 0 0805 Vishay, CRCW08050000Z0EA 26 1 L2 Inductor, 3.3H XEL4030 Coilcraft, XEL4030-332ME 27 1 L3 Inductor, 1.5H XEL4030 Coilcraft, XEL4030-152ME 28 1 L4 Inductor, 1H NPIM42P NIC Comp Corp, NPIM42P1R0MTRF 29 1 L5 Inductor, 1.5H Wurth Elektronik, 7448700015 30 1 Q1 MOSFET-N Channel, PG-TSDSON-8 Infineon, BSZ067N06LS3 G 31 1 R1 RES, CHIP, 0.008, 1W, 1%, 0815 Susumu, RL3720WT-R008-F 32 4 R2, R3, R4, R5 Res, Chip 24.9k 0.1W 1% 0603 Vishay, CRCW060324K9FKEA 33 1 R6 Res, Chip 3.32M 0.1W 1% 0603 Vishay, CRCW06033M32FKEA 34 1 R7 Res, Chip 365k 0.1W 1% 0603 Vishay, CRCW0603365KFKEA 35 1 R8 Res, Chip 806k 0.1W 1% 0603 Vishay, CRCW0603806KFKEA 36 5 R9, R11, R13, R14, R19 Res, Chip 200k 0.1W 1% 0603 Vishay, CRCW0603200KFKEA 37 1 R12 Res, Chip 464k 0.1W 1% 0603 Vishay, CRCW0603464KFKEA 38 1 R15 Res, Chip 1M 0.1W 1% 0603 Vishay, CRCW06031M00FKEA 39 1 R16 Res, Chip 30.1k 0.1W 1% 0603 Vishay, CRCW060330K1FKEA 40 1 R17 Res, Chip 187k 0.1W 1% 0603 Vishay, CRCW0603187KFKEA 41 1 R18 Res, Chip 150k 0.1W 1% 0603 Vishay, CRCW0603150KFKEA dc2469af 7 DEMO MANUAL DC2469A PARTS LIST ITEM QTY 42 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R23 Res, Chip 2.49M 0.1W 1% 0603 Vishay, CRCW06032M49FKEA 43 1 R21 Res, Chip 10k 0.1W 1% 0603 Vishay, CRCW060310K0FKEA 44 6 R24, R27, R32, R33, R36, R37 Res, Jumper, Chip, 0 0603 Vishay, CRCW06030000Z0EA 45 1 R34 Res, Jumper, Chip, 0 0805 Vishay, CRCW08050000Z0EA 46 1 U1 IC, Buck Regulator QFN (40) (UJ) Analog Device, LT8603EUJ Additional Demo Board Circuit Components 1 0 C4, C5 Cap, 0402 2 0 C14, C16, C28, C36, C37, C41, C43 Cap, 0603 3 0 C33 Cap, 1206 4 0 Q2 NPN. MMBT3904, SOT-23 5 0 R10, R20, R25, R26, R29, R30, R31, R35, R38, R39 Res, 0603 6 0 R28 Res, 1210 7 0 U2 IC, LTC6908CS6-1 TSOT-23-6 Analog Device, LTC6908CS6-1#PBF Turret, Testpoint Mill Max, 2501-2-00-80-00-00-07-0 Hardware: For Demo Board Only 1 20 E1 to E20 2 5 JP1, JP2, JP3, JP4, JP5 Headers, 3 Pins 2mm Ctrs Wurth Elektronik, 62000311121 3 5 XJP1, XJP2, XJP3, XJP4, XJP5 Shunt, 2mm Ctrs Samtec, 2SN-BK-G 4 4 MH1 to MH4 STAND-OFF, NYLON 0.25" Tall (SNAP ON) Wurth Electronik, 702931000 dc2469af 8 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. A B C D E5 OFF ON E10 OFF ON RUN EXT E15 E20 E19 E17 C4 OPT 0402 2 EN/UVLO 1 ON R23 2.49M C26 4.7F 50V 1206 FB1 742792150 3 JP3 3 2 1 3 R19 200k 1% OPT R10 RUN3 JP2 2 TRKSS2 1 JP1 2 TRKSS1 1 R3 24.9k 1% PG3 R11 200k 1% 10k 1% R21 200k 1% PG4 PG3 * 5 See Demo Manual for details on VOUT2 and VOUT4 current capability. 1. All Resistors and Capacitors 0603. INTVCC 0 22 23 R27 0 OPT R26 R25 OPT 4 C37 OPT 2 1 CPOR RT 10F 50V X7R 1206 OPT CVIN2 4.7F 0805 MOD OUT2 OUT1 4 5 6 R36 0 0815 1% R29 OPT R35 0 OPT SYNC C36 OPT OPT R38 OPT C43 OPT 27 36 34 25 7 6 5 26 3 4 VOUT1 FB3 SW3 PVIN3 FB2 SW2 SW2 BST2 FB1 SW1 BST1 FB4 24 15 ISN4 GATE4 R30 L5-1 ISN 3 3 10F 50V 1210 L2 C28 (Opt) L3 L4 1.0H NPIM42P1R0MTRF NIC Comp. Corp. CVIN3 10F 1.5H XEL4030-152ME C17 0.1F 25V 0402 R17 187k 1% R12 464k 1% R8 806k 1% R7 365k 1% R6 3.32M 1% 150k 1% R18 C31 22pF 200k 1% R13 C30 4.7pF 200k 1% R9 C29 2.2pF D1 PMEG060V050EPD C34 C38 2 L5-2 4 1.5uH 7448700015 R28 OPT 1210 Q1 BSZ067N06LS3 G OPT 50V 1206 C33 3.3H XEL4030-332ME C10 0.1F 25V 0402 1 1.5uH R37 7448700015 0 3 Q2 MMBT3906 OPT ISN4 R1 0.008 PG4 C41 OPT 1 U1 LT8603EUJ INTVCC4 FSEL4B FSEL4A INTVCC BIAS POREN RST SYNC RUN3 TRKSS2 TRKSS1 PG4 PG3 PG2 PG1 EN/UVLO VIN U2 LTC6908CS6-1 OPT GND V+ 49.9K 1% C2 0.1F 0402 CVIN4 CVIN5 CVIN6 CVIN7 C25 1500pF 31 29 R31 OPT OPTIONAL CIRCUIT R16 30.1k 1% (2MHz) INTVCC4 VOUT1 17 4.7F 28 0603 12 9 C21 4.7F 16 10V 0603 10V C20 (Opt) C14 39 32 33 30 20 21 11 40 1 VOUT1 R32 50V D2 PMEG6002EB C3 0.1F 0402 10 R24 0 VIN CVIN 1uF CVIN1 4.7F 0805 C1 22F 50V INTVCC4 PG1 1M R15 D3 PMEG6002EB R33 0 VIN + VOUT4 0 C27 0805 4.7F 50V 1206 L1 R39 3 2 OPTIONAL CIRCUIT PG2 INTVCC C16 (Opt) SYNC R5 24.9k 1% R14 47nF X7R C15 47nF X7R C11 R4 24.9k 1% OPT R20 C5 OPT 0402 NOTE: UNLESS OTHERWISE SPECIFIED. POREN RST SYNC E8 E7 E6 E12 C32 0.1F 50V 0402 VEMI 3 OFF INTVCC INTVCC INTVCC INTVCC JP4 R2 24.9k 1% E3 E1 INTVCC RUN3 TRKSS2 TRKSS1 PG4 PG3 PG2 PG1 GND VEMI+ 3V - 42V 4 14 PVIN2 37 PVIN1 2 SET 3 GND 8 GND 13 GND 35 GND 38 GND 18 ISN4 19 ISP4 41 GND 5 R34 C22 47F 10V X5R 1206 C18 100uF 6.3V 1206 C12 47F 10V X5R 1206 0 C6 47uF 16V 1210 2 2 C9 47uF 16V 1210 3 2 1 VOUT2 C23 2.2F 10V 0402 C19 2.2F 10V 0402 C13 2.2F 10V 0402 C8 0.1uF 16V VOUT4 VOUT1 VOUT2 JP5 VOUT1 C7 47F 16V VOUT3 + E18 E16 E14 E13 E11 E9 E4 E2 * GND VOUT3 1.8V / 1.5A GND VOUT2 3.3V / 1.5A * GND VOUT1 5V / 1.5A GND VOUT4 8V / 1.5A 1 1 A B C D DEMO MANUAL DC2469A SCHEMATIC DIAGRAM dc2469af 9 DEMO MANUAL DC2469A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. 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