DEMO MANUAL DC2341A LTC7130EY 20V 20A Monolithic Buck Converter with Ultra-Low DCR Sensing DESCRIPTION Demonstration circuit 2341A is a high efficiency synchronous buck DC/DC converter with 4.5V to 20V input range. It can supply 20A maximum load current at 1.5V output. The demo board features the LTC®7130 regulator. No external MOSFETs are required. It employs an LTC proprietary current sensing, current mode architecture, allowing the use of a very low DC resistance (DCR) power inductor to maximize efficiency in high current applications. Differential output voltage sensing along with a precision internal reference combine to offer accurate output regulation. The LTC7130 is housed in a 6.25mm × 7.5mm × 2.22mm 63-pin BGA package. The light load operation mode of the converter is determined with the MODE/PLLIN pin. Use the JP2 jumper to select pulse-skipping mode (P.S.), Burst Mode® (BURST) or forced continuous mode (CCM) operation. The converter can also be externally synchronized through the MODE/ PLLIN pin (MODE/PLLIN terminal on the board; JP2: no jumper or BURST position). To shut down the converter, one simple way is to force the RUN pin below 1.1V (JP1: OFF). The power good output (PGOOD terminal) is low when the output voltage is outside of the ±10% regulation window. The LTC7130 data sheet gives a complete description of the operation and application information. The data sheet must be read in conjunction with this demo manual. Design files for this circuit board are available at http://www.linear.com/demo/DC2341A 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. PERFORMANCE SUMMARY Specifications are at TA = 25°C PARAMETER CONDITIONS Input Voltage Range MIN TYP 4.5 Output Voltage VIN = 4.5V to 20V, IOUT = 0A to 20A Maximum Output Current VIN = 4.5V to 20V, VOUT = 1.5V Typical Switching Frequency MAX 20 UNITS V 1.5 ±2% V 20 A 530 kHz Typical Efficiency VIN = 12V, IOUT = 20A 89.2 Typical Output Voltage Ripple VIN = 12V, IOUT = 20A 25 % mVP-P dc2341af 1 DEMO MANUAL DC2341A QUICK START PROCEDURE Demonstration circuit 2341A is easy to set up to evaluate the performance of the LTC7130. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 5. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters. 1. With power off, connect the input power supply to VIN (4.5V to 20V) and GND (input return). NOTE: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead. 2. Connect the 1.5V output load between VOUT and GND (Initial load: no load). 3. Connect the DVMs to the input and outputs. 4. Turn on the input power supply and check for the proper output voltages. VOUT should be 1.5V ±2%. Figure 1. Proper Measurement Equipment Setup dc2341af 2 DEMO MANUAL DC2341A QUICK START PROCEDURE + – COUT VOUT GND Figure 2. Measuring Output Voltage Ripple 100 95 EFFICIENCY (%) 90 85 80 75 70 65 60 4.5VIN 12VIN 20VIN 55 50 0 5 10 15 LOAD CURRENT (A) 20 dc2341a F03 Figure 3. Efficiency vs Load Current (VO = 1.5V, Burst Mode) VO 50mV/DIV AC-COUPLED 10A LOAD STEP 5A/DIV TOTAL IO: 10A TO/ FROM 20A dc2341a F04 Figure 4. Load Step Transient Test (VIN = 12V) Figure 5. Thermal Picture (VIN = 12V, IO = 20A. 21°C Ambient, No Forced Airflow) dc2341af 3 DEMO MANUAL DC2341A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 CIN1 CAP, ALUM ELEC180µF 20% 25V PANASONIC., 25SVPF180M 2 2 CIN4, CIN5 CAP, 1210 22µF 20% 25V X5R AVX, 12103D226MAT2A 3 1 CIN6 CAP, 1206 10µF 20% 25V X5R AVX, 12063D106MAT2A 4 2 COUT1, COUT4 CAP, 7343 330µF 20% 2.5V POSCAP PANASONIC, 2R5TPE330M9 5 4 COUT2, COUT3, C15, C16 CAP, 1210 100µF 20% 6.3V X5R AVX, 12106D107MAT2A 6 2 C1, C17 CAP, 0805 1µF 10% 25V X5R AVX, 08053D105KAT2A 7 2 C2, C5, C7 CAP, 0603 220nF 10% 25V X5R MURATA GRM188R71E224KA88D 8 1 C10 CAP, 0603 0.1µF 10% 10V X5R AVX, 0603ZD104KAT2A 9 1 C11 CAP, 2.2nF X7R 50V 5% 0603 AVX, 06035C222JAT2A 10 1 C12 CAP, 0603 120pF 10% 25V NPO AVX, 06033A121KAT2A 11 2 C6, C14 CAP, 0805 4.7µF 20% 10V X5R AVX, 0805ZD475MAT2A 12 1 D1 DOIDE, SCHOTTKY 30V SOD-323 CENTRAL SEMI., CMDSH-3 TR 13 1 L1 IND, 0.25µH WURTH ELEKTRONIK, 744308025 14 1 Q1 MOSFET, N-CH D-S 40V TO252 VISHAY, SUD50N04-8M8P-4GE3 15 1 R1 RES, 2.2Ω 1/10W 5% 0603 VISHAY, CRCW06032R20JNEA 16 4 R8, R16, R17, R20 RES, 0Ω JUMPER 1/10W 0603 VISHAY, CRCW06030000Z0EA 17 2 R19, R30 RES, 10k 1/10W 5% 0603 VISHAY, CRCW060310K0JNEA 18 1 R28 SENSE RES, 2512 0.01Ω 1% 1W VISHAY, WSL2512R0100FEA 19 1 R10 RES 0603 100k 1% 1/10W VISHAY, CRCW0603100KFKEA 20 1 R13 RES 0603 1k 1% 1/10W VISHAY, CRCW06031K00FKEA 21 1 R4 RES, 0603 619Ω 1% 1/10W VISHAY, CRCW0603619RFKEA 22 2 R9, R12 RES, 0603 10Ω 5% 1/10W VISHAY, CRCW060310R0JNEA 23 1 R24 RES, 0603 6.04k 1% 1/10W VISHAY, CRCW06036K04FKEA 24 2 R3 RES, 0603 2.7Ω 1% 1/10W VISHAY, CRCW06032R7FKEA 25 1 R23 RES, 0603 124k 1% 1/10W VISHAY, CRCW0603124KFKEA 26 1 R11 RES, 0603 3.01k 1% 1/10W VISHAY, CRCW06033K01FKEA 27 1 R5 RES, 0603 3.09k 1% 1/10W VISHAY, CRCW06033K09FKEA 28 1 R32 RES, 0603 6.65k 1% 1/10W VISHAY, CRCW06036K65FKEA 29 1 U1 IC, LTC7130EY#PBF LINEAR TECH., LTC7130EY#PBF Additional Demo Board Circuit Components 30 0 COUT5, COUT6 OPT CAP, 7343 OPTION 31 0 CIN2, CIN3, (OPT) CAP, OPTION 32 0 C3, C4, C8, C9, C13, (OPT) CAP, 0603 OPTION 33 0 RN1, R2, R6, R7, R14, R15, R18, R22, R25, R27, R29 RES, 0603 OPTION Hardware: For Demo Board Only 34 13 E1-E13 TESTPOINT, TURRET, 0.094" PbF MILL-MAX, 2501-2-00-80-00-00-07-0 35 1 JP2 HEADER, 4 PIN 0.079" SINGLE ROW SULLINS, NRPN041PAEN-RC 36 1 JP1 HEADER, 3 PIN 0.079" SINGLE ROW SULLINS, NRPN031PAEN-RC 37 4 J1-J4 JACK, BANANA KEYSTONE 575-4 38 1 J5 CONN, BNC, 5 PINS CONNEX, 112404 39 4 MH1, MH2, MH3, MH4 STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833 40 2 JP1, JP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G dc2341af 4 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 EXTVCC PGOOD CLKOUT TRK/SS E10 E9 E8 E7 E6 E3 MODE/PLLIN RUN R16 0 + 5 COUT5 OPT 7343 VOUT + E13 COUT6 IOUT STEP OPT 7343 C16 100uF 6.3V 1210 R28 0.010 2512 C1 1uF 25V R1 2.2 4 R30 10K C6 1 D6 R22 OPT ITEMP CLKOUT C3 SUD50N03-10CP-E3 Q1 C17 1 1uF R29 OPT 2512 C2 D1 B6 D5 PGOOD C7 R13 1k 1% R11 3.01k 1% CIN5 22uF 25V 1210 C10 0.1uF 10V R10 100k CIN4 22uF 25V 1210 R20 0 MODE/PLLIN JP2 3 2 C6 4.7uF 6.3V CIN3 OPT 25V INTVCC VOUT C15 100uF 6.3V 1210 CCM BURST P.S. R2 OPT VIN + R6 OPT CIN2 OPT 25V VIN LOAD STEP CIRCUIT EXTVCC PGOOD CLKOUT C3 OPT RUN ON OFF 1 3 JP1 GND CIN1 + 180uF 25V J2 GND E2 4.5V - 20V 2 D J1 VIN 1 4 VIN ITEMP CLKOUT MODE/PLLIN PGOOD ILIM INTVCC RUN SVIN TK/SS J5 GND CIN6 10uF 25V 1206 4.7uF 6.3V C14 IOSTEP CLK E12 E11 VOUT R23 124k B5 4 FREQ B7 A1 NC1 U1 LTC7130 SGND SGND SGND SGND C4 C5 B3 B4 E1 3 2 3 GND GND GND GND GND GND GND GND GND GND GND 3 R24 6.04k 1% C11 2.2nF J4 J5 J6 J7 H4 H5 H6 H7 G4 G5 G6 F4 F5 F6 F7 E4 E5 E6 E7 G7 EXTVCC D7 EXTVCC A7 NC2 D2 D3 D4 E1 E2 E3 F2 F3 GND GND GND GND GND GND GND GND G1 G2 G3 H1 H2 H3 J1 J2 J3 R17 R32 6.65k 1% R19 10k 1% 0 C7 220nF C5 220nF 2.7 R14 OPT R7 OPT CMDSH-3 R3 CUSTOMER NOTICE A6 A4 A2 A3 B1 B2 C1 F1 C2 0.22uF 25V D1 C9 OPT C8 OPT R4 619 1% VOUT THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 0 R8 VOUT COUT2 100uF 6.3V 1210 2 REV OPT RN1 R9 10 COUT1 330uF 2.5V 7343 OPT R27 1.5V E5 E4 VO_SNS- VO_SNS+ GND 20A MAX 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only OPT C13 TECHNOLOGY R25 OPT + COUT4 330uF 2.5V 7343 J4 J3 VOUT DATE 9-2-15 DATE: N/A DC2341A LTC7130EY Wednesday, December 02, 2015 IC NO. 1 SHEET 1 OF 1 2 REV HIGH EFFICIENCY STEP-DOWN CONVERTER WITH INTEGRATED FETS AND VERY LOW DCR INDUCTOR TITLE: SCHEMATIC SIZE R12 10 + Charlie COUT3 100uF 6.3V 1210 APPROVED PRODUCTION 1 DESCRIPTION REVISION HISTORY TEMPERATURE COMPENSATION NETWORK FOR DCR SENSING ITEMP R15 OPT OPT C4 R5 3.09k 1% L1 0.25uH DCR=0.37mOHM __ ECO 744308025 CONTRACT NO. R18 OPT INTVCC SW 2 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED Charlie ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. C12 120pF VFB DIFFOUT DIFFN DIFFP SNSD+ SNS- SNSA+ BOOST SW SW SW SW SW SW SW SW SW ITH A5 VIN VIN VIN VIN VIN VIN VIN VIN VIN 2 3 4 5 2 1 5 A B C D DEMO MANUAL DC2341A SCHEMATIC DIAGRAM dc2341af 5 DEMO MANUAL DC2341A 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 © 2004, Linear Technology Corporation dc2341af 6 Linear Technology Corporation LT 0316 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016