DEMO MANUAL DC2268A-B LTM4620A Dual 13A or Single 26A Module Regulator Description Demonstration circuit 2268A-B is a high efficiency, high density, dual 13A, switch mode step-down power supply on a compact 1.5' x 1.2' PCB. It features the LTM4620A Module regulator. The input voltage is from 5.5V to 16V. The output voltage is programmable from 0.6V to 5V. DC2268A-B can deliver up to 13A 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 pulseskipping mode for noise sensitive applications or Burst Mode(R) in less noise sensitive applications. Two outputs can be connected in parallel for a single 26A 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 LTM4620A 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 LTM4620A data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2268A-B. Design files for this circuit board are available at http://www.linear.com/demo/DC2268A-B 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. Board Photo Figure 1. LTM4620A/DC2268A-B Demo Board dc2268abfa 1 DEMO MANUAL DC2268A-B Performance Summary PARAMETER Specifications are at TA = 25C CONDITIONS VALUE Input Voltage Range 5.5V ~ 16V Output Voltage VOUT1 VIN = 4.5V ~ 15V, IOUT1 = 0A ~ 13A 3.3V 1.5% Output Voltage VOUT2 VIN = 4.5V ~ 15V, IOUT2 = 0A ~ 13A 1.5V 1.5% Per-Channel Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT and Thermal Conditions. Default Operating Frequency 13A 750kHz Resistor Programmable Frequency Range 250kHz to 780kHz External Clock Sync. Frequency Range 400kHz to 780kHz Efficiency of Channel 1 VIN = 12V, VOUT2 = 3.3V, IOUT2 = 13A, fSW = 750kHz 91.8% See Figure 3 Efficiency of Channel 2 VIN = 12V, VOUT1 = 5V, IOUT1 = 13A, fSW = 750kHz 93.9% See Figure 4 Load Transient of Channel 1 VIN = 12V, VOUT2 = 3.3V, ISTEP = 6.5A ~ 13A See Figure 5 Load Transient of Channel 2 VIN = 12V, VOUT1 = 5V, ISTEP = 6.5A ~ 13A See Figure 6 Quick Start Procedure Demonstration circuit DC2268A-B is easy to set up to evaluate the performance of the LTM4620A. 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 to 5V or leave them floating. 2. With power off, connect the input power supply, load and meters as shown in Figure 1. 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 3.3V 1.5% (3.2505V ~ 3.3495V) and the output voltage in channel 2 should be 5V 1.5% (4.925V ~ 5.075V), 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) LTM4620A can be synchronized to an external clock signal. Remove R2 and apply a clock signal (0~5V, square wave) to MODE-PLLIN pin. 6. (Optional) LTM4620A can be configured for a 2-phase single output at up to 36A on DC2268A-B. Install 0 resistors on R26, R27, R28, R29, R32, and remove R14, R18, R30. Output voltage is set by R7 based on equation VOUT = 0.6V(1 + 60.4k/R7). dc2268abfa 2 DEMO MANUAL DC2268A-B Quick Start Procedure Table 2. 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 Figure 2. Test Setup of DC2268A-B dc2268abfa 3 DEMO MANUAL DC2268A-B Quick Start Procedure Efficiency, 3.3V 100 Efficiency, 5V 100 VIN = 12V fSW = 750kHz 95 91.6 89.1 90 90.4 91.1 92 92 92 91.9 91.8 91.8 87.5 85 84.6 91.4 90 92.4 90.2 93 93.5 93.9 94 94 94 93.9 93.7 87 85 80 80 75 EFFICICENCY (%) EFFICICENCY (%) 95 VIN = 12V fSW = 750kHz 77.4 75.2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 ILOAD (A) dc2268ab F03 Figure 3. Measured Efficiency on Channel 1 (VOUT1 = 3.3V, fSW = 750kHz, Channel 2 Disabled) 75 0 1 2 3 4 5 6 7 8 9 10 11 12 13 ILOAD (A) dc2268ab F04 Figure 4. Measured Efficiency on Channel 2 (VOUT2 = 5V, fSW = 750kHz, Channel 1 Disabled) 3.3V OUTPUT (20MHz BW) [20mV/DIV] 6.5A TO 13A LOAD STEP dc2268ab F05 Figure 5. Measured Channel 6.5A to 13A Load Transient (VIN = 12V, VOUT1 = 3.3V) dc2268abfa 4 DEMO MANUAL DC2268A-B Quick Start Procedure 5V OUTPUT (20MHz BW) [20mV/DIV] 6.5A TO 13A LOAD STEP dc2268ab F06 Figure 6. Measured Channel 2 6.5A to 13A Load Transient (VIN = 12V, VOUT2 = 5V) Figure 7. Thermal Performance at VIN = 12V, VOUT1 = 3.3V/8A, VOUT2 = 5V/8A, fSW = 750kHz, TA = 23C, 200LFM Airflow dc2268abfa 5 DEMO MANUAL DC2268A-B 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 330F 20% 6.3V POSCAP PANASONIC 6TPF330M9L 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 1 C7 CAP, 0603 47pF 5% 50V C0G / NP0 AVX 06035A470JAT2A 6 2 C8, C14 CAP, 0603 0.1F 10% 25V X7R AVX 06033C104KAT2A 7 1 C15 CAP, 0603 33pF 5% 50V C0G AVX 06035A330JAT2A 8 2 C16, C17 CAP, 0603 10F 20% 25V X5R TDK C1608X5R1E106M080AC 9 2 C18, C20 CAP, 0603 22F 20% 6.3V X5R TDK C1608X5R0J226M080AC 10 1 L1 IND, 1.0H COILCCRAFT XAL5030-102MEC 11 2 R2, R22 RES, 0603 0 JUMPER VISHAY CRCW06030000Z0EA 12 3 R3, R5, R14 RES, 0603 100 5% 0.1W VISHAY CRCW0603100RJNEA 13 1 R4 RES, 0603 121k 1% 0.1W VISHAY CRCW0603121KFKEA 14 2 R6, R17 RES, 0603 10k 5% 0.1W VISHAY CRCW060310K0JNEA 15 1 R7 RES, 0603 13.3k 1% 0.1W VISHAY CRCW060313K3FKEA 16 1 R9 RES, 0603 0 VISHAY CRCW06030000Z0EA 17 1 R15 RES, 0603 191k 1% 0.1W VISHAY CRCW0603191KFKEA 18 1 R18 RES, 0603 8.25k 1% 0.1W VISHAY CRCW06038K25FKEA 19 3 R24, R25, R30 RES, 0603 10 5% 0.1W VISHAY CRCW060310R0JNEA 20 1 U1 IC, VOLTAGE REGULATOR LGA LINEAR TECH. LTM4620AEV#PBF Additional Demo Board Circuit Components 1 0 C1, C2, C3, C4, C5, C9, C10, C11, C12, C13 CAP, 0603 OPTION OPTION 2 0 R1, R8, R10, R11, R12, R13, R16, R19, R20, R21, R23, R26, R27, R28, R29 RES, 0603 OPTION OPTION 3 0 R31, R32 RES, 2512 OPTION OPTION CONN., CARD EDGE 1.6mm SAMTEC MEC2-20-01-L-DV--TR Hardware: For Demo Board Only 1 1 J1 dc2268abfa 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 VOUT2 VOUT1 VOS2+_R VOS1-_R VOS1+_R VIN1 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 CIN1 22uF 25V 1210 VIN1 5 VIN VIN GND GND GND GND GND N/A GND VOS1+ VOS1VOS2+ VOUT1 VOUT1 VOUT1 VOUT1 VOUT2 VOUT2 VOUT2 VOUT2 J1 CIN2 22uF 25V 1210 CIN3 22uF 25V 1210 VIN VIN GND GND GND GND GND N/A GND GND RUN1 RUN2 VOUT1 VOUT1 VOUT1 VOUT1 VOUT2 VOUT2 VOUT2 VOUT2 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 VIN1 R22 0 R19 OPT INTVCC C9 OPT EXTVCC 6.3V C6 4.7uF INTVCC R31 OPT L1 1uH VOUT2 A6 A7 B6 B7 D1 D2 D3 D4 D9 D10 D11 D12 E1 G4 C6 J7 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 VOUT1 RUN2 RUN1 191K 1% R15 CIN4 22uF 25V 1210 GND GND GND GND GND GND GND GND GND GND GND GND GND PHASMD FSET EXTVCC 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 C17 10uF 25V 4 0 P1 U1 LTM4620AEV 121K 1% R4 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 4 3 COMP1 VFB1 TRACK1 RUN1 OPT R29 OPT R28 OPT R27 OPT R26 3 COMP2 VFB2 TRACK2 RUN2 OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION 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 RUN2 F9 E9 E8 D8 VFB1 10K R16 C8 0.1uF 33pF OPT C15 R23 OPT C12 TRACK1 INTVCC 10K R6 C13 OPT C14 0.1uF OPT INTVCC R17 47pF OPT C7 R11 OPT VOS1+ PGOOD1 VOS1-_R CO3 100uF 6.3V 1210 3.3V AT 13A VOUT1 CUSTOMER NOTICE COMP2 E7 C8 PGOOD2 P3 VFB2 G8 G11 D7 R9 0 P2 CO2 100uF 6.3V 1210 R24 10 R8 R5 100 VOS1- C2 OPT 330uF 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 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE C:\PROJECTS\LTM4620A\DC2268A-B\DEMO MANUAL\2268AB-2.DSN APPROVALS R18 OPT R32 VOUT2 OPT R21 DATE: N/A SIZE VFB2 VOS2+ VOS1- VOS1+ 1 VOUT2 IC NO. Friday, May 01, 2015 1 SHEET LTM4620AEV DEMO CIRCUIT 2268A-B 1 HIGH EFFICIENCY, STEP-DOWN, MODULE REGULATOR OF 1 2 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 330uF 6.3V + CO5 5V AT 13A VOUT2 VOS2+_R CO6 100uF 6.3V 1210 R30 10 R14 100 CO4 100uF 6.3V 1210 C10 OPT VOS2+ RUN1 TRACK2 C5 OPT TECHNOLOGY 8.25K 1% VFB1 COMP1 R10 OPT TITLE: SCHEMATIC VOUT1 R20 OPT VIN2 R13 OPT C11 OPT C4 OPT C3 OPT VOUT1 C18 22uF R12 OPT VIN2 R7 13.3K 1% 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. Yingyi Y. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 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-B Schematic Diagram dc2268abfa 7 DEMO MANUAL DC2268A-B 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 dc2268abfa 8 Linear Technology Corporation LT 0615 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2015