DEMO MANUAL DC1498A LTM4620EV High Efficiency, Dual 13A Step-Down Power Module Regulator Description DC1498A features the LTM(R)4620EV, the high efficiency, high density, dual 13A, switch mode step-down power module regulator. The input voltage is from 4.5V to 16V. The output voltage is programmable from 0.6V to 2.5V. DC1498A can deliver nominal 12A output current and 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 MODE jumper (JP1) 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 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. The output can be set up to either coincidentally or ratiometrically track with another supply's output. Remote output voltage sensing is available for improved output voltage regulation at the load point. These features and the availability of the LTM4620EV in a compact 15mm x 15mm x 4.41mm LGA package make it ideal for use in many high-density point-of-load regulation applications. The LTM4620 data sheet must be read in conjunction with this demo manual prior to working on or modifying DC1498A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, Linear Technology, the Linear logo and Module are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo dc1498afa 1 DEMO MANUAL DC1498A Performance Summary PARAMETER (TA = 25C) CONDITIONS VALUE Input Voltage Range 4.5V to 16V Output Voltage VOUT1 VIN = 4.5V to 16V, IOUT1 = 0A to 12A, JP1: CCM 1.5V 1.5% (1.4775V to 1.5225V) Output Voltage VOUT2 VIN = 4.5V to 16V, IOUT2 = 0A to 12A, JP1: CCM 1.2V 1.5% (1.182V to 1.218V) Per-Channel Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and Thermal Conditions. See data sheet for detail. 13A (Per Channel) Default Operating Frequency 600kHz Resistor Programmable Frequency Range 250kHz to 780kHz External Clock Synchronous Frequency Range 400kHz to 780kHz Efficiency of Channel 1 VIN = 5V, VOUT1 = 1.5V, IOUT1 = 13A, fSW = 600kHz 87.7% See Figure 2 Efficiency of Channel 2 VIN = 5V, VOUT2 = 1.2V, IOUT2 = 13A, fSW = 600kHz 85.1% See Figure 3 Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISETP = 0A to 6A See Figure 4 Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.2V, ISETP = 0A to 6A See Figure 5 Quick Start Procedure LTM4620 Demo Cards for Up to 100A Point-of-Load Regulation MAXIMUM OUTPUT CURRENT (A) NUMBER OF OUTPUT VOLTAGES NUMBER OF LTM4620 MODULE REGULATORS ON THE BOARD DEMO CARD NUMBER 13, 13 2 1 DC1498A 50 1 2 DC1780A-A 75 1 3 DC1780A-B 100 1 4 DC1780A-C DC1498A is easy to set up to evaluate the performance of the LTM4620EV. Please refer to Figure 1 for proper measurement setup and follow the procedure below: 1.Place jumpers in the following positions for a typical application: JP1 MODE JP2 RUN1 JP3 RUN2 CCM ON ON JP4 TRACK1 SEL. Soft-Start JP5 TRACK2 SEL. Soft-Start JP6 CLKOUT PHASE 90 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 1.5V 1.5% (1.4775V to 1.525V) and the output voltage in channel 2 should be 1.2V 1.5% (1.182V to 1.218V). 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 J1 and J2 with BNC cables. 50 termination should be set on the oscilloscope or BNC cables. 5.(Optional) For optional load transient test, apply an adjustable pulse signal between IOSTEP CLK and GND test point. Pulse amplitude (3V to 3.5V) sets the load step current amplitude. The output transient current can be monitored at the BNC connector J3 (15mV/A). The pulse signal should have very small duty cycle (<10%) to limit the thermal stress on the transient load circuit. Switch the jumper resistors R34 or R35 (on the backside of boards) to apply load transient on channel 1 or channel 2 correspondingly. dc1498afa 2 DEMO MANUAL DC1498A quick start procedure 6. (Optional) LTM4620 can be synchronized to an external clock signal. Place the JP1 jumper on EXT_CLK and apply a clock signal (0V to 5V, square wave) on the CLKIN test point. 7.(Optional) The outputs of LTM4620 can track another supply. The jumpers JP4 and JP5 allow choosing softstart or output tracking. If tracking external voltage is selected, the corresponding test points, TRACK1 and TRACK2, need to be connected to a valid voltage signal. 8.(Optional) LTM4620 can be configured for a 2-phase single output at up to 26A on DC1498A. Install 0 resistors on R14, R17, R28, R39 and remove R7, R19. Output voltage is set by R25 based on equation VOUT = 0.6V (1 + 60.4k/R25). Figure 1. Test Setup of DC1498A dc1498afa 3 DEMO MANUAL DC1498A 95 95 90 90 85 85 EFFICIENCY (%) EFFICIENCY (%) quick start procedure 80 75 70 60 0 2 4 6 10 8 LOAD CURRENT (A) 12 75 70 VIN = 5V VIN = 9V VIN = 12V VIN = 15V 65 80 VIN = 5V VIN = 9V VIN = 12V VIN = 15V 65 60 14 0 2 DC1498A F02 4 6 10 8 LOAD CURRENT (A) 12 14 DC1498A F03 Figure 2. Measured Efficiency on Channel 1. VOUT1 = 1.5V, fSW = 600kHz, Channel 2 Disabled Figure 3. Measured Efficiency on Channel 2 VOUT2 = 1.2V, fSW = 600kHz, Channel 1 Disabled 1.5VOUT (20MHz BW) 1.2VOUT (20MHz BW) 100mV/DIV 100mV/DIV 0A TO 6A LOAD STEP 0A TO 6A LOAD STEP DC1498A F04 100s/DIV 100s/DIV Figure 4. Measured Channel 1 0A to 6A Load Transient, VIN = 12V, VOUT1 = 1.5V DC1498A F05 Figure 5. Measured Channel 2 0A to 6A Load Transient, VIN = 12V, VOUT2 = 1.2V 1.5VOUT (20MHz BW) 50mV/DIV 1.2VOUT (20MHz BW) 50mV/DIV 5s/DIV DC1498A F06 Figure 6. Measured Output Voltage Ripple at 5V Input, 1.5V and 1.2V Output, 13A Per Channel with Standard Demo Circuit Default Setup dc1498afa 4 DEMO MANUAL DC1498A quick start procedure Figure 7. Thermal Capture at 5VIN, 1.5VOUT at 12A and 1.2VOUT at 12A. Ambient Temperature = 30C, No Airflow and No Heat Sink Figure 8. Thermal Capture at 5VIN, 1.5VOUT at 13A and 1.2VOUT at 13A. Ambient Temperature = 30C, No Airflow and No Heat Sink dc1498afa 5 DEMO MANUAL DC1498A quick start procedure Figure 9. Thermal Capture at 12VIN, 1.5VOUT at 12A and 1.2VOUT at 12A. Ambient Temperature = 30C, No Airflow and No Heat Sink Figure 10. Thermal Capture at 12VIN, 1.5VOUT at 13A and 1.2VOUT at 13A. Ambient Temperature = 30C, No Airflow and No Heat Sink dc1498afa 6 DEMO MANUAL DC1498A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER Required Circuit Components 1 4 CIN2, CIN3, CIN4, CIN5 Capacitor, X5R, 22F, 25V, 10%,1210 Murata, GRM32ER61E226KE15 2 2 COUT1, COUT7 Capacitor, 470F, 4V, POSCAP, F8 Sanyo, 4TPE470MCL 3 2 COUT4, COUT5 Capacitor, X5R, 100F, 6.3V, 20% 1210 AVX, 12106D107MAT2A 4 3 R3, R22, R26 Resistor, Chip, 10k, 1%, 0603 NIC, NRC06F10R0TRF 5 1 R19 Resistor, Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED 6 1 R25 Resistor, Chip, 40.2k, 1%, 0603 Vishay, CRCW060340K2FKED 7 1 R30 Resistor, Chip, 158k, 1%, 0603 Vishay, CRCW0603158KFKED 8 1 U1 LTM4620EV, 15mm x 15mm x 4.41mm LGA Linear Technology, LTM4620EV Capacitor, 150F, 25V, Aluminum Electr. Sun Electronics, 25CE150AX 1210 Additional Demo Board Circuit Components 9 1 CIN1 10 0 COUT2, COUT3, COUT6, COUT8 Optional 11 0 C1 Optional, 0805 12 1 C2 Capacitor, X7R, 1F, 25V, 10%, 0805 AVX, 08053C105KAT2A 13 2 C5, C7 Capacitor, X5R, 0.1F, 25V, 10%, 0603 AVX, 06033D104KAT 14 0 C3, C4, C6, C8-C12 Optional, 0603 15 2 C13, C14 Capacitor, X5R, 0.01F, 50V, 10%, 0603 AVX, 06035C103KAT 16 2 C15, C16 Capacitor, X7R, 1F, 10V, 10%, 0603 AVX, 0603ZC105KAT 17 1 Q1 N-Channel 30V MOSFET Vishay, SUD50N03-09P 18 1 R1 Resistor, Chip, 10k, 1%, 0603 NIC, NRC06F10R0TRF 19 0 R2, R4, R6, R8, R11, R14, R16, R17, R20 R23, R28, R31, R33, R39, R40 Optional, 0603 20 4 R5, R24, R27, R36 Resistor, Chip, 10k, 1%, 0603 Vishay, CRCW060310K0FKED 21 4 R7, R21, R29, R32 Resistor, Chip, 0k, 1%, 0603 Vishay, CRCW06030000Z0ED 22 5 R9, R12, R15, R18 Resistor, Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED 23 2 R10, R13 Resistor, Chip, 6.04k, 1%, 0603 Vishay, CRCW06036K04FKED 24 1 R34 Resistor, Chip, 0, 0.5W, 2010 Vishay, CRCW20200000Z0EF 25 0 R35 Optional, 2010 26 1 R37 Resistor, Chip, 0.015, 2W, 2512 27 0 R38 Optional, 2512 Vishay, WSL2512R0150FEA Hardware - For Demo Board Only 28 16 E1, E3-E10, E12-E16 Testpoint, Turret, 0.094" PBF Mill-Max, 2501-2-00-80-00-00-07-0 29 3 J1, J2, J3 Conn, BNC, 5 Pins Connex 112404 30 6 J4-J9 Jack Banana Keystone, 575-4 31 1 JP1 Header 4 Pin 0.079 Double Row Samtec, TMM104-02-L-D 32 1 JP6 Header 4 Pin 0.079 Single Row Samtec, TMM104-02-L-S 33 3 JP2, JP3, JP4 Header 3 Pin 0.079 Single Row Samtec, TMM103-02-L-S 34 1 JP5 Header 3 Pin 0.079 Double Row Samtec, TMM-103-02-L-D 35 6 XJP1-XJP6 Shunt, 0.079" Center Samtec, 2SN-BK-G 36 4 (Stand-Off) Stand-Off, Nylon 0.50" Keystone, 8833 (Snap On) dc1498afa 7 A B C D PGOOD1 SW1 VO1- GND 1.5V @ 12A VOUT1 VO1+ TRACK1 VIN- GND 4.5V-16V VIN E3 TP1 E7 J7 J6 E6 E1 E5 J5 J4 E4 CIN1 150uF 25V C9 OPT VOUT1S TRACK1 CIN3 22uF 25V 1210 5 VO1+ 10K INTVCC R27 CIN4 22uF 25V 1210 CIN5 22uF 25V 1210 VIN R32 E6 G9 G2 D5 A1 A2 A3 A4 A5 B1 B2 B3 B4 B5 C1 C2 C3 C4 F8 R21 0 C5 E5 F5 L10 L11 M2 M3 M4 M5 M6 M7 M8 M9 M10 M11 4 DIFFP DIFFN 10K R5 TEMP VO1- R29 0 C12 OPT COMP1 C11 OPT DIFFOUT R20 OPT RUN1 COUT8 + COUT7 OPT 470uF VFB1 4V R25 40.2K VOUT1 C5 0.1uF COUT6 OPT OPT R6 SOFT-START JP4 2 TRACK C3 OPT CIN2 22uF 25V 1210 R26 10 3 VO1- COUT5 100uF 6.3V 2 TRACK1 SEL. JP2 OFF ON RUN1 R2 OPT R22 10 VOUT1 VO1+ 60.4K R12 60.4K R9 + 3 1 VIN+ TEMP E15 CCM BM PS 7 5 3 INTVCC EXT_CLK1 E16 CLKIN COMP1 PGOOD1 SW1 VFB1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 DIFFOUT VOUT1S TRACK1 RUN1 VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN o o 60 90 120 o CLKOUT PHASE 158K R30 INTVCC JP6 3 2 1 JP1 MODE J6 4 DIFFN E9 DIFFP E8 FSET C6 1 L9 L8 L7 L6 L5 L4 L3 L2 K11 K10 K9 K4 K3 K2 J11 J10 J9 J4 J3 J2 VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN 4 PHASMD G4 8 6 4 2 E14 CLKOUT 3 C1 OPT INTVCC U1 LTM4620EV TEMP F4 MODE-PLLIN G5 CLKOUT H8 INTVCC J7 EXTVCC INTVCC C2 1uF E13 EXTVCC A8 A9 A10 A11 A12 B8 B9 B10 B11 B12 C9 C10 C11 C12 3 2 R19 60.4K C8 OPT OPT C10 COMP2 VFB2 C6 OPT TRACK2 VO2- PGOOD2 SW2 E12 TP2 TRACK2 VO2- GND 1.2V @ 12A VOUT2 VO2+ 1 m TECHNOLOGY E9 R3 10 E10 R15 60.4K R18 60.4K R13 6.04K R10 6.04K E8 J9 J8 R1 10 VO2+ COUT4 100uF 6.3V VO2+ VOUT1 C7 0.1uF INTVCC R24 10K JP5 6 4 2 TRACK2 SEL. 1 VO2- COUT3 OPT COUT2 OPT VOUT1 1 EXT. 3 SOFT-START 5 R8 OPT RUN2 C4 OPT 1 COUT1 470uF 4V RUN2 + VOUT2 ON OFF JP3 3 VOUT2S R7 0 OPT R4 M12 M1 L12 L1 K12 K8 K7 K6 K5 K1 J12 J8 J5 J1 H12 H11 H10 H9 H7 H6 H5 H4 H3 G7 G6 F7 F6 D6 C7 E7 G8 G11 D7 R16 OPT D8 F9 C8 VIN 2 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND SGND SGND SGND SGND SGND SGND COMP2 PGOOD2 SW2 VFB2 TRACK2 RUN2 VOUT2S VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 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 A6 A7 B6 B7 D1 D2 D3 D4 D9 D10 D11 D12 E1 E2 E3 E4 E10 E11 E12 F1 F2 F3 F10 F11 F12 G1 G3 G10 G12 H1 H2 2 8 0 5 A B C D DEMO MANUAL DC1498A Schematic Diagrams dc1498afa 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 R40 OPT 5 COMP1 VFB1 TRACK1 RUN1 R11 OPT R23 OPT R33 OPT R31 OPT IOSTEP 1uF C16 3 C14 0.01uF 2 2512 2W E18 E17 VOUT2 1 GND IOSTEP CLK 1 m TECHNOLOGY R36 10K J2 VOUT2 OPT 0.015 2512 R38 R37 1 SUD50N03-09P Q1 R35 OPT 2010 J3 2 DIFFOUT VOUT1 DIFFP DIFFN Load Transient Circuit VOUT2S VOUT1S VO2+ VO2- DIFF SENSING SELECTION 1uF C13 0.01uF R34 0 OHm 0.5W 2010 C15 COMP2 J1 VOUT1 OPT VFB2 TRACK2 RUN2 VOUT1 3 R28 OPT R17 OPT R14 OPT R39 4 INTVCC OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION TEMP 4 4 2 3 5 A B C D DEMO MANUAL DC1498A Schematic Diagrams dc1498afa 9 DEMO MANUAL DC1498A 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 dc1498afa 10 Linear Technology Corporation LT 0413 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 2012