DEMO MANUAL DC1516A LTC3833EFE Wide Input Range, High Efficiency Step-Down DC/DC Converter DESCRIPTION Demonstration circuit 1516A is a 1.5V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 24V. The demo board comes in two versions. The -A version uses inductor DCR current sensing with an iron powder inductor for highest efficiency. The -B version uses a 2.5m/1% sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode control of the LTC(R)3833 allows for a fast load step response (see Figures 4 and 5). The load step response can be tested with the on-board load step circuit and a bench pulse generator. Other features of the board include a MODE jumper to program either DCM or CCM with light or no load, a PLLIN input for synchronizing the converter to an external clock, a TRACK/SS pin, a PGOOD pin and an EXTVCC pin. The demo board uses a high density, two-sided drop-in layout. The entire converter, excluding the bulk output and input capacitors, fits within a compact 1.25" x 0.5" area on the board. The package style for the LTC3833EFE is a 20-lead TSSOP with an exposed ground pad. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. PERFORMANCE SUMMARY PARAMETER (TA = 0C to 85C) CONDITIONS/NOTES VALUE Minimum Input Voltage 4.5V Maximum Input Voltage 24V Output Voltage IOUT = 0A to 15A Switching Frequency Efficiency DCR SENSE Version (-A) RSENSE Version (-B) 1.5V 2% 300kHz VIN = 12V, VOUT = 1.5V, IOUT = 15A See Figures 2 and 3 89.4% 87.8% dc1516af 1 DEMO MANUAL DC1516A QUICK START PROCEDURE Demonstration circuit 1516A is easy to set up to evaluate the performance of the LTC3833EFE. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below. 1. With power off, connect the input supply, load and meters as shown in Figure 1. Preset the load to 0A and VIN supply to be 0V. Place jumpers in the following positions: JP1 RUN ON 2. Adjust the input voltage to be between 4.5V to 24V. VOUT should 1.5V 2%. 3. Next, apply 15A load and re-check VOUT. 4. Once the DC regulation is confirmed, observe the output voltage ripple, load step response, efficiency and other parameters. Note 1. To measure the output voltage ripple, use the BNC connector labeled VOUT. Note 2. Do not apply the load from the VO_SNS+ turret to the VO_SNS- turret. This will damage the converter. These turrets are only intended to monitor VOUT across COUT3 which is the point of regulation. JP2 MODE CCM LOAD STEP TRANSIENT TESTING (OPTIONAL) Demonstration circuit 1516A has a simple load step circuit consisting of a MOSFET and sense resistor. To apply a load step, follow the steps below. 1. Pre-set the amplitude of a pulse generator to 0.0V and the duty cycle to 5% or less. 2. Connect the VOUT and LOAD STEP BNC connectors to the oscilloscope. 3. Connect the output of the pulse generator to the PULSE GEN turret and connect the return to the GND turret. 4. With the converter running, slowly increase the amplitude of the pulse generator output to provide the desired load step pulse height. The scaling for the LOAD STEP signal is 10mV/Amp. Figure 1. Proper Measurement Equipment Setup dc1516af 2 DEMO MANUAL DC1516A LOAD STEP TRANSIENT TESTING (OPTIONAL) LTC3833 1.5V/15A Converter, CCM VIN = 12V, fSW = 300kHz LTC3833 1.5V/15A Converter, CCM and DCM VIN = 12V, fSW = 300kHz 95 100 90 DCR SENSE DCM 80 RSENSE 70 EFFICIENCY (%) EFFICIENCY (%) 90 85 80 60 CCM 50 40 30 20 75 DCR SENSE RSENSE 10 70 0 5 10 15 LOAD CURRENT (A) 0 0.01 20 10 0.10 1 LOAD CURRENT (A) QTOP = RJK0305DPB QBOTTOM = RJK0330DPB QTOP = RJK0305DPB QBOTTOM = RJK0330DPB DCR SENSE VERSION (-A): L = VISHAY IHLP4040DZ-01 0.56H DCR = 1.7m TYP, 1.8m MAX DCR SENSE VERSION (-A): L = VISHAY IHLP4040DZ-01 0.56H DCR = 1.7m TYP, 1.8m MAX RSENSE VERSION (-B): L = WURTH 7443330068 0.68H DCR = 1.35m 10% RSENSE = 2.5m RSENSE VERSION (-B): L = WURTH 7443330068 0.68H DCR = 1.35m 10% RSENSE = 2.5m dc1516a F02 Figure 2. Efficiency Curves for the DC1516A in CCM 100 dc1516a F03 Figure 3. Efficiency Curves for the DC1516A in CCM and DCM 1.5VO(AC) 50mV/DIV 123mV 15A LOAD STEP 5A/DIV 5A dc1516a F04 Figure 4. Load Step Response of the DC1516A-A (DCR SENSE) at VIN = 12V. COUT = 2x Sanyo 2R5TPE330M9 || 2x 100F X5R 6.3V 1206, L = 0.56H, fSW = 300kHz dc1516af 3 DEMO MANUAL DC1516A LOAD STEP TRANSIENT TESTING (OPTIONAL) 1.5VO(AC) 50mV/DIV 120mV 15A LOAD STEP 5A/DIV 5A dc1516a F04 Figure 5. Load Step Response of the DC1516A-B (RSENSE) at VIN = 12V. COUT = 2x Sanyo 2R5TPE330M9 || 2x 100F X5R 6.3V 1206, fSW = 300kHz, L = 0.68H, fSW = 300kHz PARTS LIST Demo Circuit 1516A-A (DCR SENSE) ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP X7R 0.1F 16V 10% 0603 AVX 0603YC104KAT2A 2 2 C1, C8 CAP X7R 0.1F 25V 20% 0603 AVX 06033C104MAT2A 3 1 C10 CAP X7R 1F 16V 10% 0603 AVX 0603YC105KAT2A 4 1 C5 CAP X5R 4.7F 16V 10% 0805 KEMET C0805C475K4PAC 5 1 C6 CAP C0G 68pF 50V 10% 0603 AVX 06035A680KAT2A 6 1 C7 CAP X7R 0.01F 16V 10% 0603 AVX 0603YC103KAT2A 7 1 C9 CAP C0G 470pF 50V 10% 0603 AVX 06035A471KAT2A 8 2 CIN1, CIN2 CAP X7R 10F 25V 20% 1210 TDK C3225X7R1E106M 9 2 CIN4, CIN5 CAP SVPD 47F 35V 20% SANYO 35SVPD47M 10 2 COUT1, COUT2 CAP X5R 100F 6.3V 20% 1206 MURATA GRM31CR60J107ME39L 11 2 COUT4, COUT3 CAP POSCAP 330F, 2.5V 20% 7343 SANYO 2R5TPE330M9 12 1 D1 DIODE SCHOTTKY 30V SOD323 CENTRAL SEMI CMDSH3-TR 13 1 L1 IND PWR 0.56H, L-IHLP4040DZ-01 VISHAY IHLP4040DZERR56M01 14 1 Q1 MOSFET POWER N-CH LFPAK RENESAS RJK0305DPB 15 1 Q2 MOSFET POWER N-CH LFPAK RENESAS RJK0330DPB 16 1 R1 RES 100k 1/16W 5% 0603 VISHAY CRCW0603100KJKEA 17 1 R10 RES 15k 1/16W 1% 0603 VISHAY CRCW060315K0FKEA 18 2 R11, R23 RES 10k 1/16W 1% 0603 VISHAY CRCW060310K0FKEA 19 1 R13 RES 2.2 1/16W 5% 0603 VISHAY CRCW06032R20JNEA 20 1 R15 RES 33.2k 1/16W 5% 0603 VISHAY CRCW060333K2JNEA 21 1 R18 RES 137k 1/16W 1% 0603 VISHAY CRCW0603137KFKEA 22 3 R2, R12, R24 RES CHIP 0 1/16W 0603 VISHAY CRCW06030000Z0EA 23 1 R3 RES 4.02k 1/16W 1% 0603 VISHAY CRCW06034K02FKEA dc1516af 4 DEMO MANUAL DC1516A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 24 2 25 1 R4, R5 RES 10 1/16W % 0603 VISHAY CRCW060310R0JNEA R7 RES CHIP 13.3k 1/16W 1% 0603 VISHAY CRCW060313K3FKEA 26 2 R9, R17 RES 0 1/16W 0603 VISHAY CRCW06030000Z0EA 27 1 RS1 RES 0.000 2512 TEPRO RN5326 28 1 U1 IC LTC3833EFETSSOP20FE-CB LINEAR TECH LTC3833EFE Additional Circuit Components 1 0 R6, R8, R16, R14, R19, R21, R25 RES 0603 OPT 2 0 C3 CAP 0805 OPT 3 0 C4, C11 CAP 0603 OPT 4 0 CIN3 CAP 1210 OPT 5 0 COUT5, COUT6 CAP 1206 OPT 6 0 D2 DIODE SMA OPT 7 0 Q4, Q3 MOSFET POWER N-CH LFPAK OPT 8 1 Q5 MOSFET N-CH DPAK-TO252AA VISHAY SILICONIX SUD50N03-12P 9 2 R20 RES 10k 1/16W 1% 0603 VISHAY CRCW060310K0FKEA 10 1 R22 RES 0.01 2% 2010 IRC LR2010-01-R010-G 1 10 E1 - E10 TESTPOINT TURRET 094" MILL-MAX 2501-2-00-80-00-00-07-0 2 4 J1, J2, J3, J4 JACK BANANA KEYSTONE 575-4 3 2 J6, J5 CONN BNC 5 PINS CONNEX 112404 4 2 JP1 & JP2 (1 & 2) SHUNT .079" CENTER SAMTEC 2SN-BK-G 5 2 JP1, JP2 JMP 3-PIN 1 ROW 0.079CC SAMTEC TMM-103-02-L-S 6 4 MH1 - MH4 STAND-OFF NYLON 0.50" KEYSTONE 8833 (SNAP-ON) PART DESCRIPTION MANUFACTURER/PART NUMBER CAP X7R 0.1F 25V 20% 0603 AVX 06033C104MAT2A Hardware Demo Circuit 1516A-B (RSENSE) ITEM QTY REFERENCE Required Circuit Components 1 2 C1, C8 2 1 C10 CAP X7R 1F 16V 10% 0603 AVX 0603YC105KAT2A 3 1 C2 CAP X7R 1000pF 16V 10% 0603 AVX 0603YC102KAT2A 4 1 C5 CAP X5R 4.7F 16V 10% 0805 KEMET C0805C475K4PAC 5 1 C6 CAP C0G 68pF 50V 10% 0603 AVX 06035A680KAT2A 6 1 C7 CAP X7R 0.01F 16V 10% 0603 AVX 0603YC103KAT2A 7 1 C9 CAP C0G 470pF 50V 10% 0603 AVX 06035A471KAT2A 8 2 CIN1, CIN2 CAP X7R 10F 25V 20% 1210 TDK C3225X7R1E106M 9 2 CIN4, CIN5 CAP SVPD 47F 35V 20% SANYO 35SVPD47M 10 2 COUT1, COUT2 CAP X5R 100F 6.3V 20% 1206 MURATA GRM31CR60J107ME39L 11 2 COUT4, COUT3 CAP POSCAP 330F 2.5V 20% 7343 SANYO 2R5TPE330M9 12 1 D1 DIODE SCHOTTKY 30V SOD323 CENTRAL SEMI CMDSH3-TR 13 1 L1 IND PWR 0.68H L-7443330068 WURTH 7443330068 14 1 Q1 MOSFET POWER N-CH LFPAK RENESAS RJK0305DPB 15 1 Q2 MOSFET POWER N-CH LFPAK RENESAS RJK0330DPB dc1516af 5 DEMO MANUAL DC1516A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 16 1 R1 RES 100k 1/16W 5% 0603 VISHAY CRCW0603100KJKEA 17 1 R10 RES 15k 1/16W 1% 0603 VISHAY CRCW060315K0FKEA 18 2 R11, R23 RES 10k 1/16W 1% 0603 VISHAY CRCW060310K0FKEA 19 1 R13 RES 2.2 1/16W 5% 0603 VISHAY CRCW06032R20JNEA 20 1 R15 RES 33.2k 1/16W 5% 0603 VISHAY CRCW060333K2JNEA 21 1 R16 RES 0 1/16W 0603 VISHAY CRCW06030000Z0EA 22 1 R18 RES 137k 1/16W 1% 0603 VISHAY CRCW0603137KFKEA 23 3 R2, R12, R24 RES 0 1/16W 0603 VISHAY CRCW06030000Z0EA 24 2 R4, R5 RES 10 1/16W 5% 0603 VISHAY CRCW060310R0JNEA 25 2 R6, R8 RES 10 1/16W 5% 0603 VISHAY CRCW060310R0JNEA 26 1 RS1 RES SENSE 0.0025 2512 TEPRO TMF12R0025F150L 27 1 U1 IC TC3833EFE TSSOP20FE-CB LINEAR TECH LTC3833EFE CAP 0805 OPT Additional Circuit Components 1 0 C3 2 0 C4, C11 CAP 0603 OPT 3 0 CIN3 CAP 1210 OPT 4 0 COUT5, COUT6 CAP 1206 OPT 5 0 D2 DIODE SMA OPT 6 0 Q4, Q3 MOSFET POWER N-CH LFPAK OPT 7 1 Q5 MOSFET N-CH DPAK-TO252AA VISHAY SILICONIX SUD50N03-12P 8 2 R20 RES 10k 1/16W 1% 0603 VISHAY CRCW060310K0FKEA 9 1 R22 RES 0.0 2% 2010 IRC LR2010-01-R010-G 10 0 R14, R19, R21, R25 RES 0603 OPT Hardware 1 10 E1 - E10 TESTPOINT TURRET 094" MILL-MAX 2501-2-00-80-00-00-07-0 2 4 J1, J2, J3, J4 JACK BANANA KEYSTONE 575-4 3 2 J6, J5 CONN BNC 5 PINS CONNEX 112404 4 2 JP1 & JP2 (1 & 2) SHUNT .079" CENTER SAMTEC 2SN-BK-G 5 2 JP1, JP2 JMP 3-PIN 1 ROW 0.079CC SAMTEC TMM-103-02-L-S 6 4 MH1 - MH4 STAND-OFF NYLON 0.50" KEYSTONE 8833 (SNAP-ON) dc1516af 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 E6 E9 C11 OPT * R16 * * R17 * * 10 9 8 7 6 5 4 3 2 1 RT VRNG ITH TRK/SS VOSNS+ VOSNS- VOUT SNS- SNS+ PGOOD 5 C2 0.1uF 1000pF ASSY -A (DCR SENSE) -B (RSENSE) 4.02k OPT R3 2. INSTALL SHUNTS ON JUMPERS AS SHOWN. OPT 10 13.3k OPT R6,R8 R7 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 11 12 13 14 15 16 17 18 19 20 4 0 OPT OPT 0 0 C10 1uF EXTVCC 16V 0805 C5 4.7uF R2 0 0.0025 R9,R17 R16 RS1 RUN EXTVCC MODE/PLLIN VIN INTVCC PGND BG SW TG BOOST U1 LTC3833EFE FSW = 300kHz R18 137K C2 33.2k 68pF R11 10K S- S+ R1 100K NOTES: UNLESS OTHERWISE SPECIFIED R21 OPT R19 OPT R15 C6 R10 15K R8 R6 470pF C9 C4 OPT INTVCC C7 0.01uF R25 OPT R24 0 VOUT R14 OPT VIN EXTVCC 1 2 3 R12 0 JP1 RUN * E10 PLLIN EXTVCC OFF ON TRK/SS PGOOD E4 INTVCC 0.56uH 0.68uH L1 R13 2.2 C8 0.1uF 25V C1 0.1uF 25V 1 2 R23 10k INTVCC D1 CMDSH-3 3 JP2 MODE 1 CCM 2 3 DCM 4 4 3 5 RJK0305DPB Q1 4 RJK0330DPB Q2 4 1 2 3 5 1 2 3 5 1 2 3 5 OPT Q4 OPT Q3 D2 OPT SMA * * R9 R7 S- S+ 2512 * RS1 2 VOUT THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE MIKE S. KT APPROVALS C3 OPT 0805 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 APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. J5 COUT2 100uF 6.3V 1206 CIN2 10uF 25V 1210 __ ECO VOUT 47uF 35V 47uF 35V R22 0.01 2010 R20 10K Q5 SUD50N03-12P 1 COUT5 OPT 1206 TECHNOLOGY J4 J3 E5 J2 J1 E3 GND VOUT 1.5V / 15A VIN- GND VIN 4.5V - 24V VIN+ VO_SNS- GND PULSE GEN DATE: N/A LTC3833EFE 1 DEMO CIRCUIT 1516A Tuesday, June 07, 2011 IC NO. SHEET 1 OF 1 2 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E8 E7 COUT6 OPT 1206 ONLY APPLY LOAD FROM J3 TO J4 330uF 2.5V 7343 35SVPD47M SANYO +CIN5 +COUT4 VOUT 35SVPD47M SANYO +CIN4 +COUT3 330uF 2.5V 7343 CIN3 1210 OPT VIN E2 DATE 06-07-11 VO_SNS+ MIKE S. E1 APPROVED PRODUCTION WIDE INPUT RANGE, HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER TITLE: SCHEMATIC SIZE R5 10 1 DESCRIPTION REVISION HISTORY LOAD STEP CIRCUIT J6 2 REV R4 10 LOAD STEP 10mV / A 5% DUTY MAX COUT1 100uF 6.3V 1206 CIN1 10uF 25V 1210 DCR SENSE FILTER / DIVIDER * L1 * R3 CUSTOMER NOTICE 1 2 3 D SGND 21 1 2 4 2 3 5 A B C D DEMO MANUAL DC1516A SCHEMATIC DIAGRAM dc1516af 7 DEMO MANUAL DC1516A 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 dc1516af 8 Linear Technology Corporation LT 0711 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2011