DEMO MANUAL DC2268A-H LTM4650-1 Dual 25A or Single 50A Module Regulator DESCRIPTION Demonstration circuit 2268A-H is a high efficiency, high density, dual 25A, switch mode step-down power supply on a compact 1.5-inch x 1.2-inch PCB. It features the LTM(R)4650-1 Module(R) regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2268A-H can deliver up to 25A maximum in each channel. As explained in the data sheet, output current derating is necessary for certain VIN, VOUT, and thermal conditions. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the resistor jumper (R1/ R2) selects pulse-skipping mode for noise sensitive applications or Burst Mode(R) operation in less noise sensitive applications. Two outputs can be connected in parallel for a single 50A output solution with optional jumper resistors. The board allows the user to program how its output ramps up and down through the TRACK/SS pin. Remote output voltage sensing is available for improved output voltage regulation at the load point. An optional input inductor L1 reduces the EMI noise for noise sensitive applications. DC2268A can be easily inserted to an edge connector for testing and debugging. These features and the availability of the LTM4650-1 in a compact 16mm x 16mm x 5.01mm BGA package make it ideal for use in many high density point-of-load regulation applications. The LTM4650-1 data sheet must be read in conjunction with this demo manual for working on or modifying the DC2268A-H. Design files for this circuit board are available at http://www.analog.com/DC2268A-H All registered trademarks and trademarks are the property of their respective owners. BOARD PHOTO Figure 1. LTM4650-1/DC2268A-H Demo Board UG-1329 Rev D 1 DEMO MANUAL DC2268A-H PERFORMANCE SUMMARY PARAMETER Specifications are at TA = 25C CONDITIONS/NOTES VALUE Output Voltage VOUT1 VIN = 4.5V ~15V, IOUT1 = 0A ~25A 1V 1.5% Output Voltage VOUT2 VIN = 4.5V ~15V, IOUT2 = 0A ~25A Input Voltage Range 4.5V ~ 15V 1.5V 1.5% Per Channel Maximum Continuous Output Current Derating is necessary for certain VIN, VOUT and thermal conditions 25A (per channel) Default Operating Frequency 500kHz External Clock Sync. Frequency Range 400kHz to 780kHz Efficiency of Channel 1 VIN = 12V, VOUT1 = 1.0V, IOUT1 = 25A, fSW = 500kHz 86.3% (see Figure 3) Efficiency of Channel 2 VIN = 12V, VOUT2 = 1.5V, IOUT2 = 25A, fSW = 500kHz 89.0% (see Figure 3) Load Transient of Channel 1 VIN = 12V, VOUT1 = 1V, ISTEP = 12.5A ~ 18.75A VOPP = 77mV (see Figure 4) Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.5V, ISTEP = 12.5A ~ 18.75A VOPP = 84mV (see Figure 5) QUICK START PROCEDURE Demonstration circuit DC2268A-H is easy to set up to evaluate the performance of the LTM4650-1. It can be easily inserted to an edge connector (SAMTEC MEC220-01-L-DV-TR) for testing and debugging. Please refer to Figure 2 for proper measurement setup and follow the procedure below: 1. Pull-up the RUN1 (J1 pin 22) and RUN2 (J1 pin 24) between 1.4V - 5V or leave them floating. 2. With power off, connect the input power supply, load and meters as shown in Figure 2. Preset the load to 0A and VIN supply to 12V. 3. Turn-on the power supply at the input. The output voltage in channel 1 should be 1.0V 1.5% (0.985V ~ 1.015V) and the output voltage in channel 2 should be 1.5V 1.5% (1.478V ~ 1.523V). 4. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, output voltage ripple, efficiency and other parameters. Output ripple should be measured at CO3 and CO4. 5. (Optional) LTM4650-1 can be synchronized to an external clock signal. Remove R2 and apply a clock signal (0V ~ 5V, square wave) to MODE-PLLIN pin. 6. (Optional) LTM4650-1 can be configured for a 2-phase single output at up to 20A on DC2268A-H. Install 0 resistors on R26, R27, R28, R29 and R32, and remove R14, R18 and R30. Output voltage is set by R7 based on equation VOUT = 0.6V (1 + 60.4k/R7). NOTE: Due to very small PCB size of the DC2268A board, the LTM4650-1 module can be quite hot at heavy load. Cooling air is required. See Figures 6 and 8. Table 1. DC2268A Demo Circuit DEMO BOARD NUMBER Module REGULATOR ON THE BOARD OUTPUT CURRENT DC2268A-A LTM4620 13A,13A DC2268A-B LTM4620A 13A,13A DC2268A-C LTM4628 8A, 8A DC2268A-D LTM4630 18A,18A DC2268A-E LTM4630-1 18A,18A DC2268A-F LTM4630A 18A, 18A DC2268A-G LTM4631 10A, 10A DC2268A-H LTM4650-1 25A, 25A DC2268A-I LTM4650A-1 25A, 25A UG-1329 Rev D 2 DEMO MANUAL DC2268A-H QUICK START PROCEDURE Figure 2. Test Setup of DC2268A-H 100 EFFICIENCY (%) 90 80 70 60 VO = 1V VO = 1.5V 0 5 10 15 LOAD CURRENT (A) 20 25 2268ah F03 Figure 3. Measured Efficiency at VIN = 12V, fSW = 500kHz, (the Other Channel Is Off when Measuring One Channel's Efficiency) UG-1329 Rev D 3 DEMO MANUAL DC2268A-H QUICK START PROCEDURE 1VOUT 20MHz BW 50mV/DIV 12.5A to 18.75A LOAD STEP Figure 4. Measured Channel 1, 12.5A to 18.75A Load Transient (VIN = 12V, VOUT1 = 1.0V) 1.5VOUT 20MHz BW 50mV/DIV 12.5A to 18.75A LOAD STEP Figure 5. Measured Channel 2 12.5A to 18.75A Load Transient (VIN = 12V, VOUT2 = 1.5V) UG-1329 Rev D 4 DEMO MANUAL DC2268A-H QUICK START PROCEDURE Figure 6. Thermal Performance at VIN = 12V, VOUT1 = 1.0V/12A, VOUT2 = 1.5V/12A, fSW = 500kHz, TA = 23C, No Forced Airflow Figure 7. Thermal Performance at VIN = 12V, VOUT1 = 1.0V/21A, VOUT2 = 1.5V/21A, fSW = 500kHz, TA = 23C, 400LFM Airflow Figure 8. Thermal Performance at VIN = 12V, VOUT1 = 1.0V/25A, VOUT2 = 1.5V/25A, fSW = 500kHz, TA = 23C, 400LFM Airflow UG-1329 Rev D 5 DEMO MANUAL DC2268A-H PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 6 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 22F 10% 25V X5R AVX 12103D226KAT2A 2 2 CO1, CO5 CAP, 7343 470F 20% 6.3V POSCAP PANASONIC 6TPF470MAH 3 4 CO2, CO3, CO4, CO6 CAP, 1210 100F 10% 6.3V X5R AVX 12106D107KAT2A 4 1 C6 CAP, 0603 4.7F 20% 6.3V X5R AVX 06036D475MAT2A 5 2 C8, C14 CAP, 0603 0.1F 10% 25V X7R AVX 06033C104KAT2A 6 2 C5, C12 CAP, 0603 10nF 5% 16V C0G AVX 0603YC103JAT2A 7 2 C16, C17 CAP, 0603 10F 20% 25V X5R TDK C1608X5R1E106M080AC 8 2 C18, C20 CAP, 0603 22F 20% 6.3V X5R TDK C1608X5R0J226M080AC 9 1 L1 IND, 1.0H COILCCRAFT XAL5030-102MEC 10 2 R2, R22 RES, 0603 0 JUMPER VISHAY CRCW06030000Z0EA 11 3 R3, R5, R14 RES, 0603 100 5% 0.1W VISHAY CRCW0603100RJNEA 12 1 R4 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA 13 2 R6, R17 RES, 0603 10k 5% 0.1W VISHAY CRCW060310K0JNEA 14 1 R7 RES, 0603 13.3k 1% 0.1W VISHAY CRCW060313K3FKEA 15 1 R9 RES, 0603 0 VISHAY CRCW06030000Z0EA 16 1 R10 RES, 0603 6.65k 1% 0.1W VISHAY CRCW0606K65FKEA 17 1 R16 RES, 0603 11k 1% 0.1W VISHAY CRCW060011K0FKEA 18 1 R15 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA 19 1 R18 RES, 0603 40.2k 1% 0.1W VISHAY CRCW060340K2FKEA 20 3 R24, R25, R30 RES, 0603 10 5% 0.1W VISHAY CRCW060310R0JNEA 21 1 U1 IC, VOLTAGE REGULATOR LGA LINEAR TECH. LTM4650EY-1B#PBF Additional Demo Board Circuit Components 1 0 C1, C2, C3, C4, C7, C9, C10, C11, C13, C15 CAP, 0603 OPTION OPTION 2 0 R1, R8, R11, R12, R13, R19, R20, R21, R23, R26, R27, R28, R29 RES, 0603 OPTION OPTION 3 0 R31, R32 RES, 2512 OPTION OPTION 1 J1 CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV-TR Hardware 1 UG-1329 Rev D 6 A B C D VOUT2 VOUT1 VOS2+_R VOS1-_R VOS1+_R LTM4650-1 LTM4650A-1 -H -I 5 LTM4620 LTM4620A LTM4628 LTM4630 LTM4630-1 LTM4630A LTM4631 -A -B -C -D -E -F -G J7 1.5V/18A 2.5V/18A 1.5V/10A 1.5V/25A 1.5V/25A 1.0V/18A 3.3V/18A 1.0V/10A 1.0V/25A 3.3V/25A VOUT2 GND GND GND GND GND GND GND GND GND GND GND GND GND PHASMD FSET EXTVCC 5V/13A 1.5V/8A A6 A7 B6 B7 D1 D2 D3 D4 D9 D10 D11 D12 E1 G4 C6 INTVCC VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN CIN6 C16 22uF 10uF 25V 25V 1210 3.3V/13A 1.0V/8A VOUT1 RUN2 VOUT1 RUN1 1% R15 * H8 L2 L3 L4 L5 L6 L7 L8 L9 L10 L11 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 CIN5 22uF 25V 1210 MODULE VIN VIN GND GND GND GND GND N/A GND GND RUN1 RUN2 VOUT1 VOUT1 VOUT1 VOUT1 VOUT2 VOUT2 VOUT2 VOUT2 VIN1 R22 0 R19 OPT INTVCC C9 OPT EXTVCC 6.3V C6 4.7uF CIN4 22uF 25V 1210 U1 [1] J1 VIN VIN GND GND GND GND GND N/A GND VOS1+ VOS1VOS2+ VOUT1 VOUT1 VOUT1 VOUT1 VOUT2 VOUT2 VOUT2 VOUT2 CIN3 22uF 25V 1210 VOUT2 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 CIN2 22uF 25V 1210 INTVCC R31 OPT L1 1uH 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 VIN1 CIN1 22uF 25V 1210 VIN1 C17 10uF 25V 4 R4 121K 1% P1 U1 [1] 0 R2 R1 OPT INTVCC GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND C5 R16 C12 C7 C15 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. 4 90.9K 40.2K 121K 13.3K 19.1K 143K 90.9K 40.2K 169K 90.9K 40.2K 121K 13.3K 40.2K 143K 7.87K 1000p 10K 3300p 7.87K 1000p 6.65K 10n 2200p 5K 14K 1000p 10K 3300p 14K 1000p 11K 10n 5K 2200p OPT 68p OPT OPT OPT OPT 68p OPT OPT OPT 13.3K 8.25K 191K OPT OPT OPT OPT 47p 33p 90.9K 40.2K 121K 7.87K 1000p 14K 1000p OPT OPT R7 R18 R15 R10 E2 E3 E4 E10 E11 E12 F1 F2 F3 F10 F11 F12 G1 G3 G10 G12 H1 H2 H3 H4 H5 H6 H7 H9 H10 H11 H12 J1 J5 J8 J12 K1 K5 K6 K7 K8 K12 L1 L12 M1 M12 VIN2 K11 K10 K9 K4 K3 K2 J11 J10 J9 J4 J3 J2 VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN J6 TEMP F4 MODE-PLLIN G5 CLKOUT 3 3 COMP2 RUN2 E7 F9 E9 E8 D8 C8 PGOOD2 P3 VFB2 G8 G11 D7 R9 0 R26 COMP2 VFB2 TRACK2 RUN2 C14 0.1uF OPT C15* R23 C12* THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. \ APP ENG. Simon. T PCB DES. 2 SCALE = NONE OPT R32 R21 VOUT2 OPT DATE: N/A SIZE VOS1- VOS1+ TRACK2 VFB2 VOS2+ 1 VOUT2 IC NO. Tuesday, June 27, 2017 1 LTM4620/LTM4620A/LTM4628/ LTM4630/LTM4630-1/LTM4631 DEMO CIRCUIT 2268A SHEET 1 HIGH EFFICIENCY, STEP-DOWN, MODULE REGULATOR OF 1 3 REV. LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 C20 22uF 470uF 6.3V * + CO5 VOUT2 VOS2+_R CO6 100uF 6.3V 1210 R30 10 R14 100 CO4 100uF 6.3V 1210 C10 OPT VOS2+ RUN1 COMP1 VFB1 TECHNOLOGY 1% R18 * C5* 1% R10 * TITLE: SCHEMATIC VOUT1 R20 OPT VIN2 R13 OPT C11 OPT C4 150pF 1% R7 * C3 OPT VOUT1 C18 22uF R12 OPT VIN2 APPROVALS 1% R16 * C8 0.1uF TRACK1 C:\PROJECTS\LTM4650-1\DC2268A-H\DC2268A-4_20170626.DSN CUSTOMER NOTICE OPT R29 OPT R28 OPT R27 OPT C13 150pF INTVCC R17 VFB1 VOS1+ 2 INTVCC 10K R6 VOS1-_R 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. COMP1 VFB1 TRACK1 RUN1 * CO3 100uF 6.3V 1210 VOUT1 PGOOD1 10K OPT C7* R11 OPT P2 CO2 100uF 6.3V 1210 R24 10 R8 R5 100 VOS1- C2 OPT 470uF 6.3V 7343 VOS1+_R + CO1 R25 10 A8 A9 A10 A11 A12 B8 B9 B10 B11 B12 C9 C10 C11 C12 F8 C5 E5 F5 E6 G9 G2 D5 R3 100 OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION DIFFN DIFFP TRACK2 VOUTS2 RUN2 COMP2 PGOOD2 SW2 VFB2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 DIFFOUT VOUTS1 TRACK1 RUN1 COMP1 PGOOD1 SW1 VFB1 C1 OPT VOS1+ A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 SGND SGND SGND SGND SGND SGND C7 D6 F6 F7 G6 G7 5 A B C D DEMO MANUAL DC2268A-H SCHEMATIC DIAGRAM UG-1329 Rev D 7 DEMO MANUAL DC2268A-H ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. 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